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Model:SP-111 SeriesSPE-111 SeriesSP-211 SeriesSPE-211 SeriesSP-311 SeriesRFD-111 SeriesRFD-211 Series

Document Number: 1022762

TWIN DISCTWIN DISCTWIN DISCTWIN DISCTWIN DISCINCORPORAINCORPORAINCORPORAINCORPORAINCORPORATEDTEDTEDTEDTED

Ser Ser Ser Ser Servicevicevicevicevice Manual Manual Manual Manual Manual

NOTICETwin Disc, Incorporated makes no warranty or guaranty of anykind, expressed, implied or otherwise, with regard to theinformation contained within this manual. Twin Disc,Incorporated has developed this manual through research andtesting of the information contained therein. Twin Disc,Incorporated assumes no responsibility for any errors that mayappear in this manual and shall not be liable under anycircumstances for incidental, consequential or punitivedamages in connection with, or arising out of, the use of thismanual. The information contained within this manual is subjectto change without notice.

Document Number1022762

IssuedJuly, 2007

Power Take-offService Manual

REVISION AND REISSUE DATA

Issued July, 2007

BEFORE YOU START

This manual replaces:#1015591 for use with model SP111HP Series,#1015994 for use with model SP111OP Series,#1015995 for use with model SP111P Series,#1015996 for use with model SP211HP Series,#1015997 for use with model SP211OP Series,#1016065 for use with model SPE111HP Series,#1016067 for use with model SPE211HP Series,#1016068 for use with model SP211OP Series,#1016070 for use with model SP311P Series, and#1019021 for use with model RFD111 & RFD211Series (Does not replace 1019021 for RFD 110Series).

LIMITED TWIN DISC GENERAL WARRANTY,

LIMITATIONS OF REMEDIES AND LIMITATION OF OTHER WARRANTIES

A. Twin Disc, Incorporated warrants all assembled products and parts (except component products or parts on which written warranties are issued by the respective manufacturers thereof and are furnished to the original customer, as to which Twin Disc, Incorporated makes no warranty and assumes no liability) against defective materials or workmanship. For products and parts other than Rockford power take-offs, such warranty shall extend for a period of twenty-four (24) months from the date of original shipment by Twin Disc, Incorporated to the original customer, but not to exceed twelve (12) months of service or two thousand (2,000) hours of service, whichever occurs first. For Rockford power take-offs products and parts, such warranty shall extend for a period of fifteen (15) months from the date of original shipment by Twin Disc, Incorporated to the original customer, but not to exceed twelve (12) months of service or one thousand five hundred (1,500) hours of service, whichever occurs first. This is the only warranty made by Twin Disc, Incorporated and is in lieu of any and all other warranties, express or implied, including the warranties of merchantability and fitness for a particular purpose and no other warranties are implied or intended to be given by Twin Disc, Incorporated. The original customer does not rely upon any tests or inspections by Twin Disc, Incorporated or on Twin Disc, Incorporated's application engineering.

B. In consideration of the Limited Twin Disc General Warranty (hereafter called warranty) and price Twin Disc,

Incorporated charges (which reflects Twin Disc, Incorporated's limited liability), the exclusive remedy provided by Twin Disc, Incorporated whether arising out of warranty within the applicable warranty period as specified, or otherwise (including tort liability), shall at the sole option of Twin Disc, Incorporated be either the repair or replacement of any Twin Disc, Incorporated part or product found by Twin Disc, Incorporated to be defective (or equivalent credit). Under no circumstances, including a failure of the exclusive remedy, shall Twin Disc, Incorporated be liable for economic loss, consequential, punitive or incidental damages. The above warranty and remedy are subject to the following terms and conditions:

1. Complete parts or products upon request must be returned transportation prepaid and also the claims submitted to

Twin Disc, Incorporated within sixty (60) days after completion of the in warranty repair. 2. The warranty is void if, in the opinion of Twin Disc, Incorporated, the failure of the part or product resulted from

abuse, neglect, improper maintenance or accident. 3. The warranty is void if any modifications are made to any product or part without the prior written consent of Twin

Disc, Incorporated. 4. The warranty is void unless the product or part is properly transported, stored and cared for from the date of shipment

to the date placed in service. 5. The warranty is void unless the product or part is properly installed and maintained within the rated capacity of the

product or part with installations properly engineered and in accordance with the practices , methods and instructions approved or provided by Twin Disc, Incorporated.

6. The warranty is void unless all required replacement parts or products are of Twin Disc origin or are Twin Disc authorized replacement parts, and otherwise identical with components of the original equipment. Replacement parts or products not of Twin Disc origin are not warranted by Twin Disc, Incorporated.

C. As consideration for this warranty, the original customer and subsequent purchaser agree to indemnify and hold Twin Disc, Incorporated harmless from and against all and any loss, liability, damages or expenses for injury to persons or property, including without limitation, the original customer's and subsequent purchaser's employees and property, due to their acts or omissions or the acts or omissions of their agents, and employees in the installation, transportation, maintenance, use and operation of said equipment.

D. Only a Twin Disc, Incorporated authorized factory representative shall have authority to assume any cost or expense in the

service, repair or replacement of any part or product within the warranty period, except when such cost or expense is authorized in advance in writing by Twin Disc, Incorporated.

E. Twin Disc, Incorporated reserves the right to improve the product through changes in design or materials without being obligated to incorporate such changes in products of prior manufacture. The original customer and subsequent purchasers will not use any such changes as evidence of insufficiency or inadequacy of prior designs or materials.

F. If failure occurs within the warranty period, and constitutes a breach of warranty, repair or replacement parts will be

furnished on a no charge basis and these parts will be covered by the remainder of the unexpired warranty which remains in effect on the complete unit.

*Note The Above constitutes the basic Twin Disc, Incorporated General Limited Warranty and may be supplemented by additional published warranty terms dependent upon the product involved. Supplementary warranty terms are available upon request.

April 20, 2007 TDWP0001 rev 2007

7

Twin Disc, Incorporated Table of Contents

Power Take-Off Service Manual #1022762

Table of Contents

Introduction .......................................................... 11General Information .......................................................................... 11Replacement Parts ............................................................................ 12Preventive Maintenance/Troubleshooting .................................... 13Safety .................................................................................................. 14Sources of Service Information ...................................................... 15Warranty .............................................................................................. 16

Description and Specifications ...........................17General Information .......................................................................... 17Finding the Twin Disc Power Take-Off Model / Serial Number ... 18Identifying the Twin Disc Power Take-off FromModel Number .. 19Twin Disc Power Take-Off Reference Listing ................................ 20Twin Disc Power Take-Off Reference Listing (continued) ........... 21Twin Disc Power Take-Off Reference Listing (continued) ........... 22Twin Disc Power Take-Off Reference Listing (continued) ........... 23Identifying the SAE Housing Size .................................................... 24Specifications .................................................................................... 25Twin Disc PTO Support Plate Specifications ................................ 29Wear Limits ......................................................................................... 30Torque Values for Fasteners ........................................................... 34

Installation ............................................................37Installation Tips .................................................................................. 37Prior to Installation (Ref: SAE J1033 and J617) ............................. 42Drive Ring Installation ....................................................................... 46Ball-Type Pilot Bearing Installation ................................................. 47Roller-Type Pilot Bearing Installation ............................................. 48PTO Installation to Engine or Driving Member ............................. 50Hand Lever Position for Twin Disc Power Take-Offs ................... 52Model SPE111 and SPE211 Arm Adjustment Procedure ............. 53Position and Measure Alignment of the Sheave ........................... 54Allowable Side Loads........................................................................ 55Alignment - U-Joint-Type Installation .............................................. 72Setting Up Air Engagement on Twin Disc Power Take Offs ........ 74

8

Twin Disc, IncorporatedTable of Contents


Operation ..............................................................77General Information .......................................................................... 77Clutch Engagement Procedure ....................................................... 78

Maintenance .........................................................81Maintenance Tips .............................................................................. 81Lubrication ......................................................................................... 84Clutch Adjustment ............................................................................. 87Friction Plate Replacement .............................................................. 89Field Adjustment - Tapered Roller Bearing End Play (side-loaded

pto applications) ........................................................................... 90Field Adjustment - Tapered Roller Bearing End Play (in-line pto

applications) .................................................................................. 91

Disassembly .........................................................93Power Take-Off Removal From The Engine .................................. 94Clutch Removal .................................................................................. 95Clutch Disassembly .......................................................................... 96Bronze Collar Disassembly ............................................................. 96Ball Bearing Collar Disassembly..................................................... 96Remove the Operating Shaft and Throwout Yoke ........................ 98Clutch Shaft and Housing Disassembly - Configuration A ........ 100Clutch Shaft and Housing Disassembly - Configuration B........ 101Clutch Shaft and Housing Disassembly - Configuration C........ 103Clutch Shaft and Housing Disassembly - Configuration D........ 105Clutch Shaft and Housing Disassembly - Configuration E ........ 107Clutch Shaft and Housing Disassembly - Configuration F ........ 109

Cleaning and Inspection .................................... 111Cleaning and Inspection................................................................. 111

9

Twin Disc, Incorporated Table of Contents


Assembly ............................................................115Clutch Assembly .............................................................................. 116Clutch Shaft and Housing Assembly - Bearing Housing Configu-

ration A ......................................................................................... 128Clutch Shaft and Housing Assembly - Bearing Housing Configu-

ration B ......................................................................................... 135Clutch Shaft and Housing Assembly - Bearing Housing Configu-

ration C ......................................................................................... 139Clutch Shaft and Housing Assembly - Bearing Housing Configu-

rations D, E & F............................................................................ 149Install the Operating Shaft and Throwout Yoke. ......................... 162PTO Final Assembly ........................................................................ 163

Illustrations .........................................................167List of Illustrations ........................................................................... 167Parts Identification List - SP111, SPE111, SP211, SPE211, SP311,

RFD111 and RFD211 Series ....................................................... 168Parts Identification List - SP111, SPE111, SP211, SPE211, SP311,

RFD111 and RFD211 Series ....................................................... 169Exploded View (SP111 and SP211 Series Clutches) .................. 170Exploded View (SP111C016 and SP211C022 Clutches) ............ 171Exploded View (Bearing Housing Configuration A).................... 172Exploded View (Bearing Housing Configuration B) ................... 173Exploded View (Bearing Housing Configuration C) ................... 174Exploded View (Bearing Housing Configuration D) ................... 175Exploded View (Bearing Housing Configuration E) ................... 176Exploded View (Bearing Housing Configuration F).................... 177Exploded View (SPE111 and SPE211 Series Throwout Mechanism) ........178

10

Twin Disc, IncorporatedTable of Contents


Engineering Drawings ......................................179SP111P203 Sheet 2 of 2 .................................................................. 180SP111P204 Sheet 2 of 2 (Typical Bearing Housing Configuration A) .....181SP111P206 Sheet 2 of 2 (Typical Bearing Housing Configuration B) ....182SP111P325 Sheet 2 of 2 .................................................................. 183SP211P101 Sheet 2 of 2 .................................................................. 184SP211P203 Sheet 2 of 2 .................................................................. 185SP211P204 Sheet 2 of 2 (Typical Bearing Housing Configuration C) ....186SP211P205 Sheet 2 of 2 .................................................................. 187SPE211P213 Sheet 2 of 2 ............................................................... 188SP211P225 Sheet 2 of 2 .................................................................. 189SP311P101 Sheet 2 of 2 (Typical Bearing Housing Configuration D) ....190SP311P301 Sheet 2 of 2 (Typical Bearing Housing Configuration E) ....191SP311P306 Sheet 2 of 2 (Typical Bearing Housing Configuration F) ....192SP111C016 Sheet 2 of 2 .................................................................. 193SPE211C015 Sheet 2 of 2 ............................................................... 194

11

Twin Disc, Incorporated Introduction

Power Take-off Service Manual #1022762

Introduction

General Information

This publication provides the information necessary for the operation andmaintenance of the Twin Disc, Incorporated equipment specified on the coverof this manual. Specific engineering details and performance characteristicscan be obtained from the Product Service Department of Twin Disc,Incorporated, Racine, Wisconsin, USA.

Operation and maintenance personnel responsible for this equipment shouldhave this manual at their disposal and be familiar with its contents. Applyingthe information in the manual will result in consistent performance from theunit and help reduce downtime.

12

Twin Disc, IncorporatedIntroduction


Replacement Parts

Parts Lists

See the engineering assembly drawings in Engineering Drawings and partsidentification and exploded views in the Illustration section to facilitateordering spare or replacement parts.

Ordering Parts

All replacement parts or products (including hoses and fittings) mustbe of Twin Disc origin or equal, and otherwise identical with componentsof the original equipment. Use of any other parts or products will voidthe warranty and may result in malfunction or accident, causing injuryto personnel and /or serious damage to the equipment.

Renewal parts and service parts kits may be obtained from any authorizedTwin Disc distributor or service dealer.

Parts Shipment

Furnish the complete shipping information and postal address. All partsshipments made from the factory will be FOB factory location, USA. Statespecifically whether the parts are to be shipped by freight, express, etc. Ifshipping instructions are not specified, the equipment will be shipped thebest way, considering time and expense. Twin Disc, Incorporated will not beresponsible for any charges incurred by this procedure.

Twin Disc, Incorporated having stipulated the bill of material number on theunit�s nameplate absolves itself of any responsibility resulting from anyexternal, internal or installation changes made in the field without the expresswritten approval of Twin Disc. All returned parts, new or old, emanating fromany of the above-stated changes will not be accepted for credit. Furthermore,any equipment which has been subjected to such changes will not be coveredby a Twin Disc warranty.

13



Preventive Maintenance/Troubleshooting

Frequent reference to the information provided in this manual regarding dailyoperation and limitations of this equipment will assist in obtaining trouble-free operation. Schedules are provided for the recommended maintenanceof the equipment and, if observed, minimum repairs (aside from normal wear)will result.

In the event a malfunction does occur, a troubleshooting table is provided tohelp identify the problem area and lists information that will help determinethe extent of the repairs necessary to get a unit back into operation.

Lifting Bolt Holes

Most Twin Disc products have provisions for attaching lifting bolts. The holesprovided are always of adequate size and number to safely lift the Twin Discproduct.

These lifting points must not be used to lift the complete power unit.Lifting excessive loads at these points could cause failure at the liftpoint (or points) and result in damage or personal injury.

Select lifting eyebolts to obtain maximum thread engagement with boltshoulder tight against housing. Bolts should be near but should notcontact bottom of bolt hole.

14



Safety

General

Safe practices must be employed by all personnel operating and servicingthis unit. Twin Disc, Incorporated will not be responsible for personal injuryresulting from careless use of hand tools, lifting equipment, power tools, orunaccepted maintenance/operating practices.

Important Safety Notice

Because of the possible danger to person(s) or property from accidents whichmay result from the use of manufactured products, it is important that correctprocedures be followed. Products must be used in accordance with theengineering information specified. Proper installation, maintenance, andoperation procedures must be observed. Inspection should be made asnecessary to assure safe operations under prevailing conditions. Properguards and other suitable safety codes should be provided. These devicesare neither provided by Twin Disc, Incorporated nor are they the responsibilityof Twin Disc, Incorporated.

15



Sources of Service Information

Each series of manuals issued by Twin Disc, Incorporated is current at thetime of printing. When required, changes are made to reflect advancingtechnology and improvements in state-of-the-art.

Individual product service bulletins are issued to provide the field withimmediate notice of new service information.

For the latest service information on Twin Disc products, contact any TwinDisc distributor, or contact the Product Service Department, Twin Disc,Incorporated, Racine, Wisconsin 53405-3698, USA by e-mail [email protected].

Contact information for Authorized Twin Disc Distributors and Service Dealerscan be found on the Twin Disc Web site at: http://www.twindisc.com.

16



Warranty

Equipment for which this manual was written has a limited warranty. Fordetails of the warranty, refer to the warranty statement at the front of thismanual.

17

Twin Disc, Incorporated Description and Specifications


Description and Specifications

General Information

The SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211 SeriesTwin Disc Power Take-Offs are engine-mounted power take-offs that use castiron one-piece or two-piece housings and contain an integral clutch 11 1/2inches in diameter. The engine drives the clutch through a drive ring that isbolted to the engine flywheel and connected to the clutch through internal teeththat mesh with external teeth on the clutch friction plate(s). Clutch engagementand disengagement for most units is accomplished by use of the external handlever assembly. Some units may use other actuation methods.

Main bearings are lubricated and cooled with oil or grease, depending uponthe design specifications. Most units use pilot bearings that are pre-lubricatedand sealed for life, although some may require periodic relubrication. Thosethat require periodic relubrication are lubricated through a grease fitting locatedin the output end or side of the clutch shaft.

SPE models are designed with release mechanism features and a positiveclearance mechanism to provide �extended service� and �limited attendance�advantages.

18

Twin Disc, IncorporatedDescription and Specifications


Finding the Twin Disc Power Take-Off Model and Serial Number

The nameplate identifies the model, bill of material (BOM) and the serial numberof the unit. These numbers are necessary to identify the correct parts for yourPower Take-Off.

BOM No.

S/N

Model No.

Information and

instructions

specific to each

individual PTO.

Figure 1. Representative Instruction Plate

19



Identifying the Twin Disc Power Take-off From Its Model Number

Typical Model Identification Number: SP-111HP-3

SP 1 11 HP - 3

A B C D E{ { { { {

A. Indicates the type of clutch.SP = Counter balanced, toggle action overcenter clutchSPE = SP model for extended serviceRFD = Rockford design with combination Twin Disc and Rockforddesign components

B. Indicates the number of friction plates in the clutch.1 = 1 clutch friction plate2 = 2 clutch friction plates3 = 3 clutch friction plates

C. Indicates the nominal size of the clutch friction plates (inches).11 = 11.5� diameter (nominal), measured just inside the root of the teeth

D. Indicates the housing design.P = standard (grease lubricated main bearings)HP = Heavy Duty (grease lubricated main bearings)OP = oil lubricated main bearingsIL = main bearings for in-line duty only

E. Indicates the S.A.E. housing size.1 = SAE # 1 housing2 = SAE # 2 housing3 = SAE # 3 housing

20



Twin Disc Power Take-Off Reference Listing

The Twin Disc Power Take-Off Reference Listing on the following pages refersto various basic design configuration designations used for the main bearinghousing. These designations are used primarily to simplify explanation of thedisassembly and assembly procedures in this manual. The following chartprovides a general description of the basic features of each configuration andalso provides general information regarding each Twin Disc Power Take-Off.However, always refer to a current BOM for your specific power take-off toinsure that the most up-to-date information is being used.

A B C D E F

Main Housing and Bearing Carrier

1-piece X X

2-piece (Separate Items) X X X X

Assembly of Main Bearings

From opposite ends of shaft X X X X X

Both from same end of shaft X

Retention of Main Bearing(s)

Retained by bearing retainer X X X X X

Retained by lock nut X

Bearing Retainer

Threaded X X

Bolted X X X

Neither X

Retention of Bearing Retainer

Retained by lock tab X X

Retained by bolts X X X

Retained by snap ring(s) X

Also a rear bearing retainer X

Main Bearing Adjustment

Rotate bearing retainer X X

Shims X X

No adjustment X X

Oil Seals in Housing or Brg. Carrier X X

Wear Sleeve(s) on Shaft X

Configuration

Feature

21



Twin Disc Power Take-Off Reference Listing (continued)

Gre

as

e

Oil

Bro

nze

Ba

ll

Ca

st

Iro

n

No

du

lar

Main Bearing

Lubrication

Throwout

Collar Type

Pilot Bearing

Type

Drive Ring

TypeMain Bearing

Housing

Configuration

Ba

ll

Ro

lle

r

Facing

Type

Sp

lit

So

lid

SP111HP1 SP111P101 x x X X X A

SP111HP1 SP111P102 X X X X A

SP111HP1 SP111P103 X X X X X A






SP111HP2 SP111P203 X X X A


SP111P2 SP111P205 X X X X X A

SP111P2 SP111P206 X not used X X B





















SPE111HP3 SP111P325 X spcl spcl X X X A










Su

pp

ort

Pla

te R

eq

’d

Model

NumberBOM

22




Gre

as

e

Oil

Bro

nze

Ba

ll

Ca

st

Iro

n

No

du

lar

Main Bearing

Lubrication

Throwout

Collar Type

Pilot Bearing

Type

Drive Ring

TypeMain Bearing

Housing

Configuration

Ba

ll

Ro

lle

r

Facing

Type

Sp

lit

So

lid

Su

pp

ort

Pla

te R

eq

’d






SP211OP2 SP211P204 X X X X X X C

SP211P2 SP211P205 X X not used X X B




SPE211HP2 SP211P213 X spcl spcl X X X X A


SPE211HP2 SP211P220 X spcl spcl X X X X A

SP211P2 SP211P221 X X not used X B


SP211P2 SP211P225 X X not used X X B




















SP311IL1 SP311P101 X X not used X X X D

SP311P2 SP311P201 X X X X X X E




SP311P3 SP311P305 X X X X X E

SP311OP3 SP311P306 X X X X X X F

Model

NumberBOM

23




Gre

as

e

Oil

Bro

nze

Ba

ll

Ca

st

Iro

n

No

du

lar

Main Bearing

Lubrication

Throwout

Collar Type

Pilot Bearing

Type

Drive Ring

TypeMain Bearing

Housing

Configuration

Ba

ll

Ro

lle

r

Facing

Type

Sp

lit

So

lid

Su

pp

ort

Pla

te R

eq

’d

Model

NumberBOM

RFD211P2 TR411127 X X X X X A

RFD211P2 TR411127A X X X X X A

RFD211P2 TR411127B X X X X A

RFD111HP3 TR434510 X X X X X A

RFD111HP3 TR434510A X X X X X A

RFD111HP3 TR434510B X X X X A

RFD111HP3 TR434510C X X X X X A

RFD211P3 TR434845 X X X X X A

RFD211P3 TR434845A X X X X X A

RFD211P3 TR434845B X X X X A

24



Identifying the SAE Housing Size

A

B

D

C

Table 1. SAE Housing Identification

1 511.18 20.125 552.4 21.75 530.22 20.875 12 12.29 .484

2 447.68 17.625 489.0 19.25 466.72 18.375 12 10.99 .433

3 409.58 16.125 450.8 17.75 428.62 16.875 12 10.99 .433

SAE

Housing

Size

A

Housing

Pilot Diameter

B

Housing

Flange O.D.

C

Bolt Circle

Diameter

D

Bolt Holes

Qty.Dia.

mm. inches mm. inches mm. inches mm. inches

25



Specifications

Maximum Safe Operating Speeds for Twin Disc Power Take-offs

(Refer to BOM and Twin Disc Power Take-Off Reference Listing on previouspages.)

Table 2. Maximum Safe Operating Speeds

PTO Model Solid

Drive Plate(s)

Split

Drive Plate

Solid

Drive Plate(s)

Split

Drive Plate

SP111 Series Grease 2850 2200 3600 3200

SPE111 Series Grease 2850 2200 3600 3200

SP211 Series Grease 2850 2200 3500 3160

SPE211 Series Grease 2850 2200 3500 3160

SP211 Series Oil 2850 2200 3000 3000

SP311 Series Grease 2850 2200 3500 3160

SP311 Series Oil 2850 2200 3000 3000

RFD111 Series Grease 2800 2800 2800 2800

RFD211 Series Grease 2800 2800 2800 2800

Grease- or Oil-

lubricated Main

Bearing(s)

Cast Iron Drive Ring Steel or Nodular Drive Ring

Pilot bearing position (If used)


Ball-TypeThe owner/operator is responsible for checking the flywheel to ensure that thepilot bearing is installed on the shaft with sufficient clearance without bottomingin the flywheel bore. The depth of the pilot bore from the flywheel housing faceto shoulder on the flywheel pilot flange is 100.07 mm. (3.94 in.).

Roller-Type

Table 3. Roller-Type Pilot Bearing Dimensions

M2467 72 mm. (2.835 in.) 30.1 mm. (1.185 in.) 0.5 mm. (0.0025 in.)

Roller

Bearing

Bearing O.D.Bearing Nominal

Width (C)

Bearing Nominal

Width +/- tolerance

26



Tapered Roller Bearing End Play

Table 4. Recommended Bearing End Playfor Tapered Roller Bearings Used in Side-Loaded applications

SP111P Series .10 - .18 .004 - .007

SP111HP Series .10 - .18 .004 - .007

SP111OP Series .10 - .18 .004 - .007

RFD111HP Series .10 - .18 .004 - .007

SP211P Series .10 - .18 .004 - .007

SP211HP Series .10 - .18 .004 - .007

SPE211HP Series .10 - .18 .004 - .007

SP211OP Series .10 - .18 .004 - .007

RFD211P Series .10 - .18 .004 - .007

SP311P Series .15 - .25 .006 - .010

SP311OP Series .15 - .25 .006 - .010

SP311IL Series n/a (Ball Bearing) n/a (Ball Bearing)

Model Number mm.

Recommended End Play

inches

27



Table 5. Recommended Bearing End Playfor Tapered Roller Bearings Used in In-Line applications

SP111P Series .10 - .18 .004 - .007

SP111HP Series .10 - .18 .004 - .007

SP111OP Series .10 - .18 .004 - .007

RFD111HP Series .10 - .18 .004 - .007

SP211P Series .18 - .23 .007 - .009

SP211HP Series .18 - .23 .007 - .009

SPE211HP Series .18 - .23 .007 - .009

SP211OP Series .18 - .23 .007 - .009

RFD211P Series .18 - .23 .007 - .009

SP311P Series .23 - .30 .009 - .012

SP311OP Series .23 - .30 .009 - .012

SP311IL Series n/a (Ball Bearing) n/a (Ball Bearing)

Model Number mm.

Recommended End Play

inches

Engagement force on the operating shaft

Table 6. Torque at operating shaft to engage clutch

SP111 Series 144 -191 107 - 141

SPE111 Series 144 -191 107 - 141

RFD111 Series 144 -191 107 - 141

SP211 Series 181 - 240 133 - 177

SPE211 Series 181 - 240 133 - 177

RFD211 Series 181 - 240 133 - 177

SP311 Series 232 - 308 171 - 227

Model Peak Torque on Operating Shaft

Nm Lb.-Ft.

28



Filling the Main Bearing Cavity during initial assembly.


Grease Lubrication:Hand-pack the bearings before assembly. Hand-packing requires that the rollerelements and bearing races be coated with grease. After assembly, add greasethrough the grease fitting until grease escapes from the outboard labyrinth sealall around the shaft. Do Not Overfill. Always rotate the shaft while adding greaseto the bearing cavity.

Oil Lubrication SP211OP and SPE211OP Series:Fill with oil through the fitting at the top of the bearing carrier until the oil levelregisters full on the oil level gauge.

Oil Lubrication SP311OP Series (BOM SP311P306, for example):Oil is supplied through a hose connected to the (orifice) fitting at the top of thebearing carrier. Oil is supplied whenever the engine is running. Oil drains fromthe bearing carrier through a hose connected at the bottom of the bearing carrier.

Filling the Main Bearing Cavity during periodic maintenance.

Refer to the information contained in the Maintenance section of this manual.

PTO Deflection

PTO deflection due to loads imposed by the application should not exceed0.254 mm (0.010 in.). Deflection should be measured at the support plate pilotwith the dial indicator base mounted on a rigid part of the engine. See theillustration in Installation Tips in the Installation section of this manual.

29



Twin Disc PTO Support Plate Specifications

Twin Disc, Inc. requires that a support plate be used with some SP211 andSP311Series models.

G

B(diameter)

(angle to

first hole)

D

(Holes)

E (Qty.)

F (dia.)

43.18 cm. (17.0 in.)

Shim to

within

.12 cm.

(.005 in.)

A(diameter)

C(radius)

Figure 2. Typical Support Plate Illustration

Table 7. Support Plate Dimensions

PTO

Model

A

Bore Dia.

+.127/.025mm

(+.005/+.001”)

B

Bolt

Circle (Dia.)

C

Radius

D

Degree

E

Hole

Quantity

F

Hole

Diameter

G

Recommended

Thickness

SP211OP 45° 812.70 mm.

(0.500 in.)

SP311P 30° 612.70 mm.

(0.500 in.)

127.00 mm.

(5.00 in.)

225.43 mm.

(8.875 in.)

190.5 mm.

(7.50 in.)

SP311OP 30° 6

17/32 in.

12.70 mm.

(0.500 in.)

165.86 mm.

(6.53 in.)

307.98 mm.

(12.125 in.)

273.05 mm.

(10.75 in.)

17/32 in.

17/32 in.225.43 mm.

(8.875 in.)

190.5 mm.

(7.50 in.)

SP311IL 30° 612.70 mm.

(0.500 in.)

17/32 in.225.43 mm.

(8.875 in.)

190.5 mm.

(7.50 in.)

127.00 mm.

(5.00 in.)

127.00 mm.

(5.00 in.)

Note: One possible mounting method provides installation ease.Use angle iron to couple the support plate to the engineframe.

30



Wear Limits

Table 8. Wear Limits - Housing/Bearing Carrier Bore Dimensions(Refer to BOM for the Bearing Carrier/Housing Part Number used in your PTO)

8247 110.025 4.3317 n/a n/a 3

8251 110.025 4.3317 n/a n/a 3

8252 110.025 4.3317 n/a n/a 3

8252B 110.025 4.3317 n/a n/a 3

8252J 110.025 4.3317 n/a n/a 3

9682 112.748 4.4385 n/a n/a 3

9682C 112.748 4.4385 n/a n/a 3

9682E 112.748 4.4385 n/a n/a 3

9700 112.748 4.4385 n/a n/a 3

9702 110.025 4.3317 n/a n/a 3

9703 110.025 4.3317 n/a n/a 3

9977A 112.748 4.4385 n/a n/a 3

9977C 112.748 4.4385 n/a n/a 3

A5195 152.425 6.0010 n/a n/a 1

A7547 136.710 5.3823 136.576 5.377 5

B5470A 115.006 4.5278 n/a n/a 4

1016518 160.065 6.3017 160.065 6.3017 2

02004245 109.995 4.3305 n/a n/a 3

Housing

Part Number

Bearing Carrier

Part Number

Bore Dim. A

(Maximum)

mm. inches

Illustration

Number

Bore Dim. B

(Maximum)

mm. inches

31



1A

B

A

A

A

A

B

3

4

5

2

Figure 3. Housing/Bearing Carrier Illustrations

32



Table 9. Wear Limits - Shaft Dimensions(Refer to BOM for the Clutch Shaft Part Number used in your PTO)

Shaft

Part

Number

Pilot Bearing

Journal (Min.)

mm. inches

Illus.

Number

Front & Rear

Seal Journals

(Min.)

mm. inches mm. inches mm. inches

Main Bearing

Journal Dim. A

(Min.)

Main Bearing

Journal Dim. B

(Min.)

A5188 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188A 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188AS 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188AZ 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BQ 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BR 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BU 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BW 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BX 24.999 0.9842 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BY 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A5188BZ 29.997 1.181 57.188 2.2515 57.188 2.2515 n/a n/a 1

A5188CA 29.997 1.181 57.188 2.2515 57.188 2.2515 n/a n/a 1

A6691 29.997 1.181 66.713 2.6265 66.713 2.6265 n/a n/a 1

A6691AC 29.997 1.181 66.713 2.6265 66.713 2.6265 n/a n/a 1

A6691AV 29.997 1.181 66.713 2.6265 66.713 2.6265 n/a n/a 1

A6691AW 29.997 1.181 66.713 2.6265 66.713 2.6265 n/a n/a 1

A6691D 29.997 1.181 66.713 2.6265 66.713 2.6265 n/a n/a 1

A6711 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A6711L 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A6711R 29.997 1.181 63.538 2.5015 63.538 2.5015 n/a n/a 1

A7551 not used 76.238 3.0015 71.478 2.8141 n/a n/a 2

A7552 not used 76.238 3.0015 71.478 2.8141 n/a n/a 2

B5027AP 29.997 1.181 95.301 3.752 95.301 3.752 n/a n/a 1

B5027AT not used 90.030 3.545 90.030 3.545 n/a n/a 4

B5027AU 29.997 1.181 95.301 3.752 95.301 3.752 n/a n/a 1

B5027AY 29.997 1.181 95.301 3.752 95.301 3.752 91.999 3.622 1

B5471B 29.997 1.181 70.025 2.7569 70.025 2.7569 66.650 2.624 3

33



1

2

3

4

Figure 4. Clutch Shaft Illustrations

34



Torque Values for Fasteners

Note: The tables below provide information for several differenttypes of fasteners: U.S. Standard Fine and Coarse ThreadCapscrews, Bolts, and Nuts; Metric Coarse ThreadCapscrews, Bolts, and Nuts; Tapered Pipe Plugs (withthread lubricant); Straight Threaded Tube Fittings, HoseFittings, and O-ring Plugs. Be sure to use the appropriatetable to obtain the correct torque value.

Note: All threads and bearing face to be lubricated with light oilfilm prior to assembly.

Table 10. U.S. Standard Fine and Coarse Thread Capscrews, Bolts, and Nuts

1/4 8 - 11 6 - 8 14 - 16 10 - 12

5/16 18 - 23 13 - 17 27 - 33 20 - 24

3/8 34 - 39 25 - 29 47 - 56 35 - 41

7/16 50 - 58 37 - 43 75 - 88 55 - 65

1/2 81 - 95 60 - 70 113 - 132 83 - 97

9/16 111 - 133 82 - 98 163 - 190 120 - 140

5/8 163 - 190 120 - 140 224 - 264 165 - 195

3/4 278 - 332 205 - 245 400 - 468 295 - 345

7/8 447 - 529 330 - 390 637 - 746 470 - 550

1 671 - 793 495 - 585 969 - 1132 715 - 835

1 1/8 834 - 997 615 - 735 1376 - 1607 1015 - 1185

1 1/4 1152 - 1356 850 - 1000 1864 - 2203 1375 - 1625

Thread

Diameter

SAE Grade 5 SAE Grade 8

lb.-ft.N-m lb.-ft.N-m

35



Table 11. Metric Coarse Thread Capscrews, Bolts, and Nuts

Thread

Size

Property Class 8.8 Property Class 12.9

lb.-ft.N-m lb.-ft.N-m lb.-ft.N-m

Property Class 10.9

M6 9 -10 6.5 - 7.5 12 - 14 9 - 10 14 - 16 10 - 12

M8 21 -25 16 - 18 31 - 35 23 - 26 34 - 40 25 - 29

M10 43 - 49 32 - 36 60 - 68 44 - 51 70 - 80 51 - 59

M12 74 - 86 55 - 63 104 - 120 77 - 88 121 - 139 89 - 103

M16 179 - 205 132 - 151 256 - 294 189 - 217 298 - 342 219 - 253

M18 247 - 281 182 - 208 350 - 398 258 - 294 412 - 469 304 - 346

M20 348 - 400 257 - 295 493 - 567 364 - 418 581 - 669 429 - 493

M22 475 - 541 351 - 399 669 - 762 494 - 562 792 - 902 584 - 666

M24 603 - 693 445 - 511 848 - 976 626 - 720 1000 - 1150 737 - 848

M30 967 - 1113 714 - 820 1674 - 1926 1235 - 1421 2000 - 2301 1475 - 1697

Table 12. Tapered Pipe Plugs (with thread lubricant)

1/6-27 11.5 8.5 7.5 5.5

1/8-27 14 10.5 9 6.5

1/4-18 34 25 21.5 16

3/8-18 36.5 27 23 17

1/2-14 68 50 40.5 30

3/4-14 73 54 46 34

1-11 1/2 108 80 68 50

1 1/4-11 1/2 115 85 75 55

1 1/2-11 1/2 115 85 75 55

NPTF

Size (in.)

In Cast Iron or Steel In Aluminum

N-m (+ or - 5%) lb.-ft. (+ or - 5%)N-m (+ or - 5%)lb.-ft. (+ or - 5%)

36



Table 13. Straight Threaded Tube Fittings, Hose Fittings, and O-ring Plugs

Nominal

Thread

Diameter

lb.-ft. (+ or - 5%)

5/16 5 3.5

3/8 11.5 8.5

7/16 16 12

1/2 20 15

9/16 24.5 18

5/8 24.5 18

11/16 34 25

3/4 40.5 30

7/8 54 40

1 1/16 75 55

1 3/16 88 65

1 1/4 88 65

1 5/16 108 80

1 3/8 108 80

1 5/8 108 80

1 7/8 108 80

2 1/2 108 80

N-m (+ or - 5%)

Nominal

Thread

Diameter

lb.-ft. (+ or - 5%)N-m (+ or - 5%)

M10X1.0 12 9

M12X1.5 16 12

M14X1.5 20 15

M16X1.5 24 18

M18X1.5 34 25

M22X1.5 54 40

M27X2.0 75 55

(in iron)

M27X2.0 75 55

(in aluminum)

M33X2.0 88 65

M42X2.0 108 80

M48X2.0 108 80

37

Twin Disc, Incorporated Installation


Installation

Installation Tips

Tapered Roller Bearing Adjustment

1. Tapered roller bearing end play adjustment is different in SP211, SP311and RFD211 Series Power Take-Offs for side load applications than itis for in-line applications. Insure that the adjustment is correct for theapplication.

2. All SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211Series Power Take-Offs are manufactured at Twin Disc�s factory withthe tapered roller bearing end play adjusted for side-load application.

3. Tests and controlled studies indicate that the tapered roller bearing endplay adjustment for SP111, SPE111 and RFD111 Series Power-Take-Offs does not need to be changed to use the PTO for in-line applications.No readjustment is necessary.

4. Tapered roller bearing end play in SP111, SPE111, SP211, SPE211,SP311, RFD111 and RFD211Series Power Take-Offs used for in-lineapplications must be adjusted to specifications shown in TaperedRoller Bearing End Play in the Description and Specifications sectionof this manual.

a. For model SP211, SPE211, SP311 and RFD211 PTOs thatare rebuilt or remanufactured : Adjust the end play to properspecifications for in-line applications at the time of assembly.Follow instructions contained in the Assembly section of thismanual.

38

Twin Disc, IncorporatedInstallation


b. For SP211, SPE211, SP311 and RFD211 Series PTOsmanufactured in Twin Disc’s factory: Readjust the factoryend play setting prior to installation on the engine for in-lineapplications. Most SP211, SPE211, SP311 and RFD211 SeriesPower Take-Offs have a tag attached to the housing whichcontains instructions that must be followed. Readjust the endplay setting as instructed.

Figure 5. Factory Instruction Tag for End Play Adjustment

Alignment

5. The flywheel and flywheel housing alignment must be within specifications.Perform the measurements shown in Prior To Installation in thisInstallation section.

6. Avoid excessive misalignment between the engine and PTO. Checkthe following if abnormal wear of parts exists:

a. Excessive loads tend to deflect parts to which PTOs are mounted.A dial indicator can be mounted on a rigid part of the engine orindependently on the foundation to determine deflection underactual operating conditions. See Support Plate, Belt or chaintension/Allowable Side Load Pulls and Deflection Causedby Side Load Pulls in this Installation section and informationcontained in the Description and Specifications sectionregarding these issues

b. Readings taken before the drive is installed with the enginestanding still and when under operating conditions (with the engineoff and all belts, chains, driveshafts and/or support plates attachedand secured with bolts torqued to specifications) will indicatethe extent of deflection. In no case should the deflection exceed0.254 mm. (0.010 in.) (T.I.R.) at the bearing carrier.

Note: The dial indicator should never be applied with the enginerunning. This is unsafe and could result in damage to thedial indicator.

39



7. In a u-joint-type installation, to realize the longest possible life of thepower take-off bearings, the best possible alignment must be maintainedbetween the center line of the power take-off shaft and the center line ofthe driven unit shaft. See information contained in Alignment-U-Joint-Type Installation in this Installation section.

8. In side-load installations, alignment between the driveR and driveNpulleys must be carefully established and maintained. See Positionand Measure Alignment of the Sheave in this Installation section.

Drive Ring

9. The drive ring must be properly installed. See information in Drive RingInstallation in this Installation section.

Pilot Bearings

10. Ball-type pilot bearings and Roller-type pilot bearings must be installedproperly. See Ball-Type Pilot Bearing Installation or Roller-Type PilotBearing Installation in this Installation section.

Support Plate

11. When mounting the engine and Power Take Off in the machine, acustomer-supplied support plate may be required to support the outputend of the pto housing. See the information about customer-suppliedsupport plates and Twin Disc PTO Support Plate Specificationscontained in the Description and Specifications section of this manual.

Failure to follow this requirement may result in damage to the powertake off or the engine flywheel housing.

Belt or chain tension/Allowable Side Load Pulls

12. Avoid excessive tightening of belts or chains. See the Allowable SideLoad tables in this Installation section.

13. Avoid excessively loose belts or chains. Belt tension or chain adjustmentthat is below specifications can cause belt/chain “whip” during operation,resulting in bearing failure and shortened power take-off service life.

40



Deflection Caused by Side Load Pulls

14. Power Take-Off deflection due to loads imposed by the applicationshould not exceed specified limits shown in PTO Deflection in theDescription and Specifications section. Deflection should be measuredat the support plate location on the power take-off (or main bearing areaof the housing if no support plate is used).

Figure 6. Determining Deflection While Applying Side Loads

The dial indicator should not be applied while the unit is operating. Thiscould result in damage to the dial indicator.

Lubrication

15. Verify that the PTO is properly lubricated prior to starting the engine.

a. The throwout collar is lubricated by grease through a grease fittingon the outside of the main housing.

b. SP211OP and SP311OP Series main bearings are lubricatedby oil contained in the main bearing cavity.

c. All other SP111, SPE111, SP211, SPE211, SP311, RFD111and RFD211Series main bearings are lubricated by greasethrough a grease fitting in the housing or bearing carrier.

41



d. The sealed-for-life pilot bearing should not be lubricated duringservice.

e. Pilot bearings designed for periodic lubrication must be greased.See Lubrication in the Maintenance section for moreinformation. Improper lubrication will result in premature failureof components. DO NOT OVERGREASE!

Refer to the Twin Disc Power Take-Off Reference Listing and Filling theMain Bearing Cavity in the Description and Specifications section,Lubrication in the Maintenance section and Engineering Drawings nearthe back of this manual.

Clutch Adjustment

16. Verify that the clutch is adjusted according to the procedure outlined inClutch Adjustment in the Maintenance section. Failure to do so willresult in premature clutch wear and failure.

Note: Twin Disc will not be responsible for any damage or injuryresulting from improper adjustment and/or lubrication. Thisincludes any accessory drives and loads.

Hand Lever Position

17. Proper hand lever position is required to obtain long service life of thethrowout bearing. See Hand Lever Position for Twin Disc PowerTake-Offs and Model SPE211 and SPE311 Arm AdjustmentProcedure in this Installation section.

Air Engagement Mechanisms

18. Air engagement mechanisms must be installed and adjusted properlyfor proper clutch actuation and long service life of the PTO. No preloadon the throwout bearing can exist either in the fully-engaged or fully-released positions, and the air mechanism must be engineered andinstalled to provide proper engagement force and stroke to properlyengage and disengage the clutch. See Setting Up Air Engagementon Twin Disc Power Take-Offs in this Installation section.

42



Prior to Installation (Ref: SAE J1033 and J617)

Refer to Identifying the SAE Housing Size in the Descriptionand Specifications section of this manual.

Most Twin Disc products mount directly onto the flywheel of the engine.Flywheel-to-driven component interference is possible due to mismatchof components or other reasons. Therefore, engine crankshaft endplayas well as flywheel alignment check must be made before the drivencomponent, the Power Take-Off, is installed.

After installation of the Power Take-Off, crankshaft end play should bemeasured again. End play at the second measurement should be thesame as the first. A difference in these two end play measurements couldbe an indication of interference. Consequently, the Power Take-Offshould be removed and the source of interference found and corrected.

Twin Disc will not be responsible for system damage caused by engineto Twin Disc match-up regardless of the cause of interference. Thisengine crankshaft end play check is considered mandatory.

Note: All measurements must be taken with the engine or motormounted on its supports after the flywheel and housinghave been thoroughly cleaned.

1. Measure and record the engine crankshaft or motor shaft endplay usinga dial indicator. Record this value, as it will be used later._______

43



2. Bolt the indicator to the flywheel so the indicator is perpendicular to theflywheel housing face and the indicator stem rides on the flywheel housingface.

Figure 7. Checking Flywheel Housing Face

3. Rotate the shaft through on entire revolution and note the runout. Thetotal indicator reading (T.I.R.) must not exceed:

SAE #1 Housing 0.30 mm. (0.012 in.)SAE #2 Housing 0.28 mm. (0.011 in.)SAE #3 Housing 0.25 mm. (0.010 in.)

Note: The flywheel and crankshaft of the engine must be heldagainst either the front or rear of the crankshaft thrustbearing while the total indicator sweep (T.I.R.) is beingmade.

4. Readjust the indicator so the stem rides on the pilot bore of the flywheelhousing face.

Figure 8. Checking Flywheel Housing Bore

44



5. Rotate the shaft through one entire revolution and note the runout. Thetotal indicator reading (T.I.R.) should not exceed:

SAE #1 Housing 0.30 mm. (0.012 in.)SAE #2 Housing 0.28 mm. (0.011 in.)SAE #3 Housing 0.25 mm. (0.010 in.)

6. Remove the indicator base from the flywheel and bolt it to the flywheelhousing face. Position the indicator stem so that it rides where the drivering will set on the flywheel face.

Figure 9. Checking Driving Ring Surface of Flywheel

7. Rotate the shaft through one entire revolution and note the face runout ofthe flywheel. The total indicator reading (T.I.R.) must not exceed 0.01mm.(0.0005 in.) per 25.4 mm. (per inch) of flywheel diameter.

Note: The flywheel and crankshaft of the engine must be heldagainst either the front or rear of the crankshaft thrustbearing while the total indicator sweep (T.I.R.) is beingmade.

8. Readjust the indicator stem so it rides on the driving ring pilot bore ofthe flywheel.

Figure 10. Checking Driving Ring Pilot Bore of Flywheel

45



9. Rotate the shaft through one entire revolution and note the driving ringbore eccentricity. The total indicator reading (T.I.R.) must not exceed0.13 mm. (0.005 in.).

10. Adjust the indicator stem so that it rides on the pilot bearing bore cavity.

Figure 11. Checking Pilot Bearing Bore of Flywheel

11. Rotate the shaft through one entire revolution and note the pilot bearingbore eccentricity. The total indicator reading (T.I.R.) must not exceed0.13 mm. (0.005 in.).

Note: Eccentricity between the driving ring pilot bore and thepilot bearing bore must not exceed 0.20 mm. (0.008 in.).

46



Drive Ring Installation

Refer to information regarding cleaning and inspection of the drive ring in theCleaning and Inspection section of this manual before proceeding.

1. Clean the drive ring and flywheel of any dirt or debris as necessary.

2. Use crocus cloth or emery cloth to remove any surface imperfectionssuch as nicks, burrs, and sharp edges on the O.D. or the surface thatwill be mounted against the flywheel face.

3. Use crocus cloth or emery cloth to remove any surface imperfectionssuch as nicks, burrs, and sharp edges in the I.D. of the flywheel pilotbore or on the face that will be in contact with the drive ring.

4. Position the drive ring against the flywheel, piloted in the mounting bore,and secure with eight hex-head capscrews. Torque the capscrew to theproper specifications given in Torque Values for Fasteners in theDescription and Specifications section of this manual.

Drive ring attachment screws must be grade 8 per SAE J429. Do notuse substitutes.

47



Ball-Type Pilot Bearing Installation

Refer to the Twin Disc Power Take-Off Reference Listing in the Descriptionand Specifications section and Engineering Drawings near the back of thismanual.

Refer to information regarding cleaning and inspection in the Cleaning andInspection section of this manual before proceeding.

1. Support the output end of the clutch shaft.

2. Make sure the clutch shaft end stub is free of surface imperfectionssuch as nicks, burrs, and sharp edges. Remove them using fine emerycloth or crocus cloth.

3. Tap the pilot bearing onto the clutch shaft. The front face of the pilotbearing should be positioned flush with the input end of the clutch shaft.Tap or apply force to only the inner race of the bearing.

Note: Tap or press only on the inner race of the bearing. Anyimpact on the outer race or balls will damage the bearing,resulting in shortened service life or premature failure.

Do not damage the seal of the pilot bearing. A damaged seal rendersthe pilot bearing destroyed and it must be replace with a new bearing.

Front of Pilot

Bearing Flush with

End of Clutch

Shaft

Clutch Shaft

Pilot Bearing

(Ball-type shown)

Figure 12. Position of the Ball-Type Pilot Bearing on the Shaft

48



Roller-Type Pilot Bearing Installation

Some Twin Disc Power Take-Offs are designed with roller-type pilot bearings.All of the roller-type bearings available from Twin Disc are the separate racetype, i.e. the inner race is removable from the outer race and seal assembly.Due to its design configuration, axial alignment of the inner and outer racesis extremely important. The information and instructions below will assure properbearing mounting.

Instructions for assembly.

Refer to the Twin Disc Power Take-Off Reference Listing in the Descriptionand Specifications section and Engineering Drawings near the back of thismanual.

Refer to information regarding cleaning and inspection of the relatedcomponents in the Cleaning and Inspection section of this manual beforeproceeding.

1. Position the PTO on the bed of a press with the pilot bearing end up andthe output end of the clutch shaft resting firmly on a solid support.

Note: The PTO must be standing on the output end of the shaft.

The power take-off must be securely supported as it stands on the endof the shaft so it does not tip or fall over.

Output end of the

shaft MUST rest and

be in contact with a

solid support (Press

bed).

Use several 4” x 4”

blocks or other

means of insuring

the PTO does not tip

or fall over.

123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234

123123123123123123123123123123123123123123123123123123123123123123123123

123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234

123123123123123123123123123123123123123123123123123123123123123123123123

Figure 13. Support the PTO, Standing it on the End of the Shaft

49



2. Press the pilot bearing inner race on the clutch shaft so it is flush with theinput end of the shaft.

3. Carefully measure dimension (a). Record the measurement.

4. Refer to the Roller-Type Pilot Bearing Dimensions table in theDescription and Specifications section of this manual. Subtract theappropriate roller bearing nominal width (c) from measurement (a). Thiswill determine the position of the pilot bearing outer race in the flywheelbore (dimension b).

a - c = b (pilot bearing outer race position)

5. Install the pilot bearing outer race in the flywheel and position it atdimension (b) as shown.

Pilot Bearing

Inner Race

Inner race

flush with

end of shaft

a

b

Flywheel

Housing

Face

Flywheel

Pilot Bearing

outer race

Figure 14. Install Pilot Bearing-Roller Type

50



PTO Installation to Engine or Driving Member

Refer to the Twin Disc Power Take-Off Reference Listing in the Descriptionand Specifications section, the exploded views in the Illustration section andEngineering Drawings near the back of this manual.

Refer to information regarding cleaning and inspection in the Cleaning andInspection section of this manual before proceeding.

1. Clean the PTO housing flange, flywheel housing flange, and pilot bearingbore of any debris.

2. Make sure the housing flange and flywheel housing flange are free ofsurface imperfections such as nicks, burrs, and sharp edges. Removethem using fine emery cloth or crocus cloth.

3. Install a minimum of three guide studs in the flywheel housing, locatedapproximately 120o apart. Using a suitable hoist, position the PTO onthe guide studs and slide it against the flywheel housing, carefully aligningthe pilot bearing with the pilot bearing bore in the flywheel and the teethof the friction plates (6) with the drive ring (1).

Do not force the PTO unit onto the engine. If any resistance is noted,repeat the clutch plate centering procedure shown either in the clutchassembly or final assembly information of the Assembly section of thismanual to align and center the friction plates so they mesh properlywith the teeth of the drive ring.

4. Secure the PTO housing to the flywheel housing with 16 hex-headcapscrews. Torque the capscrew to the proper specifications given inTorque Values for Fasteners in the Description and Specificationssection of this manual.

Note: PTO housing to flywheel housing attachment screws mustbe grade 5 or better.

5. Rap the output end of the main shaft with a soft hammer to remove anypreload on the main bearings and/or pilot bearing.

This step must not be omitted. Bearing failure may result.

51



6. Measure the crankshaft endplay again. The measurement must be thesame value as recorded from step 1 under Prior To Installation. Locateand correct the source of preload if the end play is not the same value.

Engine and/or PTO failure will result from any excessive preload oncomponents.

7. Install the key (34) on the output end of the clutch shaft (33) and installthe drive sheave, chain sprocket, or u-joint flange as the applicationrequires.

Refer to the Twin Disc Power Take-Off Reference Listing in theDescription and Specifications section, and Engineering Drawingstowards the back of this manual. If a customer-supplied PTO supportplate mounted at the output end of the PTO is to be used, refer toinformation regarding the support plate in Twin Disc PTO Support PlateSpecifications in the Description and Specifications section of thismanual.

8. Install the hand lever assembly (53) as shown in the Hand LeverPosition for Twin Disc Power Take-Offs and, if appropriate, theModel SPE111 and SPE211 Arm Adjustment Procedure in thisInstallation section, and torque the hex head capscrew to 81 - 95 Nm(60 - 70 lb. ft.)

52



Hand Lever Position for Twin Disc Power Take-Offs

Normal Position: Operating Shaft Horizontal

To insure there is no preload on the shifting mechanism, the hand lever positionwith the clutch engaged should be slightly past vertical position, slightly towardsengine.

The handle should NEVER be installed in a horizontal position whenthe operating shaft is positioned horizontally. Improper handle positioncan cause throwout collar failure resulting in catastrophic failure of theclutch.

Vertical

DisengagedEngaged

Figure 15. Hand Lever Position

Special Position: Operating Shaft Vertical

If the installation requires that the operating shaft be in a vertical position, astop collar must be installed to prevent the weight of the hand lever, operatingshaft and throwout yoke from creating a preload on the throwout collar. Positionthe hand lever as described above and also position and lock a stop collar onthe operating shaft so that the throwout yoke is centered on the throwout collar.Contact Twin Disc�s Service Department for information on use of a stop collar.

Stop CollarOperating Shaft

Figure 16. Use of a stop collar with a vertical operating shaft

53



Model SPE111 and SPE211 Arm Adjustment Procedure

Clearance “X”

SPE111 - 3.048 mm. (0.120 in.)

SPE211 - 2.286 mm. (0.090 in.)

Clearance

SPE111 - 3.048 mm. (0.120 in.)

SPE211 - 3.048 mm. (0.120 in.)

Figure 17. SPE111 and SPE211 Series Adjust Camrols

Refer to the Engineering Drawings, the illustrations above and the explodedviews in the Illustrations section of this manual.

1. Loosen the neutral lock arm hex head capscrew that secures it to theoperating shaft.

2. Engage the clutch.

3. Position the camrols (92) at the clearance �X� by using feeler stock orgauges.

4. Place the detent roller (84) in the forward groove of the detent locator(88).

5. Position the neutral lock arm (80) on the operating shaft to provide aclearance of 3.148 mm. (0.120 in.) between the snap ring (79) on theroller pin (82) and the neutral lock arm.

6. Tighten the neutral lock arm hex head capscrew and torque to 40.7 Nm(30 lb.-ft.).

54



Position and Measure Alignment of the Sheave

1. Align the driveR and driveN shafts so that the faces of the sheaves arealigned and parallel to each other. Misalignment must be LESS THAN1/2 of 1 degree between the faces.

2. Position the sheave (driveR sheave on the PTO shaft) so it is alignedwith the driveN sheave (on equipment being driven by the PTO).

3. Calculate MAXIMUM allowable misalignment distance of the faces:Max. = 0.222 mm. (0.00875 in.) x distance between sheave centerlines.

4. Place a tight cord or straight edge against both edges of the flat face ofone sheave. Measure the distance between the cord or straight edgeand the face of the other sheave. The gap is the misalignment distance.Align the sheaves to meet specifications.

Misalignment between the sheaves will result in shortened service lifeof the belts and may result in premature equipment failure.

Misalignment

Distance

Measure

misalignment

distance

between

sheave face and

cord or straight

edge here.

Straight edge

or tight cord to

be flat against

both edges of

both sheaves

Use

Alignment

straight edge

or tight cord

Use

Alignment

straight edge

or tight cord

Aligned Not Aligned

Straight edge

or tight cord

flat against

both edges of

one sheave

DriveR Sheave

DriveN Sheave

DriveR Sheave

DriveN Sheave

DriveR and

DriveN shafts

must be parallel.

Figure 18. Align Sheaves to Specifications

55



Allowable Side Loads

Side loads must NEVER exceed the values shown in this section.

x

CENTERLINE

OF SIDE

LOAD

REAR OF BEARING

HOUSING

L=126,000 x H.P.

N x Dx F x LF

Figure 19. Allowable Side Pull and Formula to Determine Applied Load

Formula values:

� L = actual applied load (Lbs.)

� N = shaft speed (RPM)

� D = pitch diameter (in.) at sheave, etc.

� F = load factor− 1.0 for chain or gear drive − 2.5 for all V belts− 1.5 for timing belts − 3.5 for flat belts

� LF = 2.1 for reciprocating compressors and other severe shock driversand 1.8 for large inertia type drive (crushers, chippers, planers)

If side load pulls are found to exceed the Allowable Side Loads shown in thecharts and graphs that follow, take appropriate action, BEFORE OPERATINGTHE PTO, to bring the side loads within acceptable limits.

A support plate must be attached at the rear of some PTOs. See theTwin Disc Power Take-Off Reference Listing and Twin Disc Support PlateSpecifications in the Description and Specifications section of thismanual.

Note: SP311IL Power Take-offs (BOM SP311P101, forexample) are recommended for in-line, not side-loaded,applications.

56



Table 14. Allowable Side Loads

1 2 3 4 5 6

1000 3050 2550 2000 1652 1400 1220

1200 2900 2550 2000 1652 1400 1220

1800 2560 2370 2000 1652 1400 1220

2400 2340 2170 2000 1652 1400 1220

2800 2235 2070 1925 1652 1400 1220

RPM

‘X’ Distance

(Table 14.1) SP111P (M224A): SP111P205, SP111P207, SP111P208, SP111P210,

SP111P211, SP111P304, SP111P309, SP111P310

Table 14.1

0

500

1000

1500

2000

2500

3000

3500

0 1 2 3 4 5 6

"X" Distance, inches (see drawing)

Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

2800

57



Table 14. Allowable Side Loads (continued)

1 2 3 4 5 6

1000 2790 2600 2240 1840 1570 1333

1200 2630 2450 2240 1840 1570 1333

1800 2330 2170 2030 1840 1570 1333

2400 2140 1990 1865 1750 1570 1333

(Table 14.2) SP111P, SPE111HP (M224, M224A, M2467, M2262A):

SP111P101, SP111P102, SP111P103, SP111P104,

SP111P106, SP111P107, SP111P201, SP111P204,

SP111P212, SP111P301, SP111P303, SP111P305,

SP111P306, SP111P307, SP111P312, SP111P314,

SP111P315, SP111P319, SP111P321, SP111P323,

SP111P325, SP111P326, SP111P328, SP111P330,

SP111P331, SP111P333, SP111P334, SP111P335,

RPM

‘X’ Distance

Table 14.2

0

500

1000

1500

2000

2500

3000

0 1 2 3 4 5 6

"X" Distance, inches (see draw ing)

Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

58




1 2 3 4 5 6

1000 3290 3060 2870 2700 2540 2240

1200 3190 2970 2780 2610 2460 2240

1800 2810 2620 2450 2300 2170 2050

2400 2530 2370 2220 2090 1970 1860

2800 2320 2160 2030 1890 1800 1700

RPM

‘X’ Distance

(Table 14.3) SP111OP (M2467): X9818

Table 14.3

0

500

1000

1500

2000

2500

3000

3500

0 1 2 3 4 5 6


Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

59




1 2 3 4 5 6

1000 4540 3395 2710 2255 1930 1690

1200 4370 3395 2710 2255 1930 1690

1800 3900 3395 2710 2255 1930 1690

2400 3550 3330 2710 2255 1930 1690

RPM

‘X’ Distance

(Table 14.4) SP211HP (M224 & M224A): SP211P101, SP211P102, SP211P201,

SP211P203, SP211P206, SP211P216, SP211P224,

SP211P227, SP211P301, SP211P302, SP211P304,

SP211P305, SP211P306, SP211P307, SP211P309,

SP211P312, SP211P314, SP211P315, SP211P318,

SP211P319, SP211P320, SP211P321, SP211P322

Table 14.4

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 1 2 3 4 5 6


Ma

xim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

60




1 2 3 4 5 6

1000 4728 3558 2852 2380 2042 1788

1200 4728 3558 2852 2380 2042 1788

1800 4656 3558 2852 2380 2042 1788

2400 4273 3558 2852 2380 2042 1788

3000 3993 3558 2852 2380 2042 1788

RPM

‘X’ Distance

(Table 14.5) SP211OP (M224): X9894B

Table 14.5

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 1 2 3 4 5 6


Ma

xim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

61




1 2 3 4 5 6

1000 5454 4104 3292 2745 2357 2062

1200 5251 4104 3292 2745 2357 2062

1800 4651 4104 3292 2745 2357 2062

2400 4268 4001 3292 2745 2357 2062

RPM

‘X’ Distance

(Table 14.6) SP211OP (M2467): SP211P226

Table 14.6

0

1000

2000

3000

4000

5000

6000

0 1 2 3 4 5 6


Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

62




1 2 3 4 5 6

1000 4585 3605 2970 2526 2197 1944

1200 4585 3605 2970 2526 2197 1944

1800 4585 3605 2970 2526 2197 1944

2400 4585 3605 2970 2526 2197 1944

3000 4585 3605 2970 2526 2197 1944

RPM

‘X’ Distance

(Table 14.7) SP311P (M224A): SP311P201, SP311P301, SP311P303, SP311P304

Table 14.7

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 1 2 3 4 5 6


Ma

xim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

63




1 2 3 4 5 6

1000 1920 1409 1113 919 783 682

1200 1920 1409 1113 919 783 682

1800 1920 1409 1113 919 783 682

2400 1920 1409 1113 919 783 682

RPM

‘X’ Distance

(Table 14.8) SP111HP (M163A): SP111P332

Table 14.8

0

500

1000

1500

2000

2500

0 1 2 3 4 5 6


Ma

xim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

64




1 2 3 4 5 6

1000 2670 1959 1547 1278 1089 948

1200 2670 1959 1547 1278 1089 948

1800 2670 1959 1547 1278 1089 948

2400 2670 1959 1547 1278 1089 948

3000 2670 1959 1547 1278 1089 948

RPM

‘X’ Distance

(Table 14.9) SP111P (M167): SP111P332

Table 14.9

0

500

1000

1500

2000

2500

3000

0 1 2 3 4 5 6


Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

65




(Table 14.10) SP211OP (M224A): SP211P204, SP211P207, SP211P209

1 2 3 4 5 6

1000 4232 3184 2552 2130 1827 1600

1200 4232 3184 2552 2130 1827 1600

1800 4232 3184 2552 2130 1827 1600

2400 4232 3184 2552 2130 1827 1600

3000 4232 3184 2552 2130 1827 1600

RPM

‘X’ Distance

Table 14.10

0

500

1000

1500

2000

2500

3000

3500

4000

4500

0 1 2 3 4 5 6


Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

66




1 2 3 4 5 6

1000 4172 3281 2703 2298 1999 1769

1200 4172 3281 2703 2298 1999 1769

1800 4172 3281 2703 2298 1999 1769

2400 4172 3281 2703 2298 1999 1769

3000 4172 3281 2703 2298 1999 1769

RPM

‘X’ Distance

(Table 14.11) SP311OP (M224A): SP311P306

Table 14.11

0

500

1000

1500

2000

2500

3000

3500

4000

4500

0 1 2 3 4 5 6

"X" Dis tance , inches (see draw ing)

Ma

xim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

67




1 2 3 4 5 6

1000 4619 3579 2858 2378 2037 1781

1200 4373 3579 2858 2378 2037 1781

1800 3872 3579 2858 2378 2037 1781

2400 3552 3315 2858 2378 2037 1781

3000 3322 3100 2858 2378 2037 1781

(Table 14.12) SPE211HP (M2467): SP211P213, SP211P220

RPM

‘X’ Distance

Table 14.12

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 1 2 3 4 5 6


Maxim

um

lo

ad

, L

bs

1000 RPM

1200 RPM

1800 RPM

2400 RPM

3000 RPM

68




1 2 3 4 5 6

2000 4510 3890 3090 2570 2190 1910

2200 4380 3770 3000 2490 2120 1850

2400 4270 3660 2910 2410 2060 1800

2600 4170 3560 2830 2350 2010 1750

2800 4070 3480 2760 2290 1960 1710

RPM

‘X’ Distance

(Table 14.13) RFD111HP (02007431): TR434510, TR434510C

T ab le 14.13

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

1 2 3 4 5 6

"X" Dis tan ce , in ch e s (s e e d r aw in g )

Ma

xim

um

Lo

ad

, L

bs

2000 RPM

2200 RPM

2400 RPM

2600 RPM

2800 RPM

69




1 2 3 4 5 6

2000 5280 3940 3140 2610 2230 1950

2200 5110 3810 3040 2530 2160 1890

2400 4970 3710 2950 2460 2100 1840

2600 4840 3610 2880 2390 2050 1790

2800 4720 3520 2810 2330 2000 1740

RPM

‘X’ Distance

(Table 14.14) RFD211P (02007431): TR411127, TR434845

Table 14.14

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

1 2 3 4 5 6

"X" Dis tance , inche s (s e e dr aw ing)

Maxim

um

Lo

ad

, L

bs

2000 RPM

2200 RPM

2400 RPM

2600 RPM

2800 RPM

70




1 2 3 4 5 6

1600 2691 1996 1586 1316 1124 981

1900 2541 1885 1498 1243 1062 927

2200 2420 1795 1426 1183 1011 883

2500 2319 1720 1367 1134 969 846

2800 2233 1656 1316 1092 933 814

RPM

‘X’ Distance

(Table 14.15) RFD111P (M224A): TR434510A

Table 14.15

0

500

1000

1500

2000

2500

3000

1 2 3 4 5 6

"X" Dis tance , inche s (s e e draw ing)

Maxim

um

Lo

ad

, L

bs

1600 RPM

1900 RPM

2200 RPM

2500 RPM

2800 RPM

71




1 2 3 4 5 6

1600 2698 2013 1606 1335 1143 999

1900 2548 1901 1516 1261 1079 943

2200 2426 1810 1444 1201 1028 898

2500 2325 1735 1384 1511 985 861

2800 2239 1671 1332 1108 948 829

RPM

‘X’ Distance

(Table 14.16) RFD211P (M224A): TR11127A, TR434845

Table 14.16

0

500

1000

1500

2000

2500

3000

1 2 3 4 5 6

"X" Dis tance , inche s (s e e draw ing)

Ma

xim

um

Lo

ad

, L

bs

1600 RPM

1900 RPM

2200 RPM

2500 RPM

2800 RPM

72



Alignment - U-Joint-Type Installation

Refer to illustration on next page.

To realize the longest possible life of the power take-off bearings, the bestpossible alignment must be maintained between the center line of the powertake-off shaft and the center line of the driven unit shaft.

1. It is extremely important that the forks of the drive shaft between thePTO and the driven unit lie in the same plane. This will prevent severevibrations from occurring in the drive shaft.

2. The center lines of the PTO shaft and the driven unit input shaft must beoffset within the limits recommended by the u-joint manufacturer toprolong the life of the universal joint needle bearings.

3. It is extremely important that the center lines of the pto shaft and drivenunit input shaft be parallel. This will further prevent vibrations which causepremature pto bearing failure.

4. Proper lubrication of the pto is important for satisfactory service. Referto lubrication specifications in the Maintenance section of this manual.

Align the centerlines of the pto shaft and the input shaft of the drivenunit. (One possible method is described below.)

5. To align the engine and gear head by this method, two accurate straightedges at least 91 cm. (36 in.) long and a tape measure are required.

6. Place the straight edges horizontally along the face of the pto and gearhead hubs. Measure distances A and B. These two distances should beequal within 3.17 mm. (.125 in.) at a point 45.7 cm. (18 in.) from thecenterline of the shaft. Move the engine and/or driven unit to obtain thisspecification.

7. Rotate the shafts so the straight edges are in a vertical position. Measurethe distances C and D as was done for A and B in step 2. These twodistances should be equal within 3.17 mm. (.125 in.) at a point 45.7 cm.(18 in.) from the centerline of the shaft. Move the engine and/or drivenunit to obtain this specification.

73



8. Secure the engine and driven unit. Recheck A and B, C and D asdescribed in steps 5 through 7 above. All measurements must be withinthe specifications. If not, repeat steps 5 through 7 until specificationsare met.

Figure 20. Alignment - U-Joint-Type Installation

74



Setting Up Air Engagement on Twin Disc Power Take Offs

1. The cylinder should be located so that the piston moves forward andbackward in exactly the same direction as the engagement lever and isaligned so it travels in exactly the same plane.

2. The air cylinder must be of sufficient size to operate the required torqueto engage the clutch. It must have some means to make adjustment onthe piston stroke.

3. Air pressure must be constant. Low pressures could give only partialengagement which will cause failures of the clutch and throwout collar.

4. The piston travel must be within limits established to both fully engageand fully disengage the clutch. Failure to provide these parameters willcause failure and possible breakage of the clutch.

5. The engaging cylinder must not place a pressure either in the engagedor disengaged direction after completion of its cycle. The throwout collarmust float free after engagement or disengagement. Operating the ptowith constant pressure on the throwout collar will result in failure.

Suggestion:A slotted connector, similar to the one illustratedbelow may be used.

Fully

Engaged

Position

Fully

Disengaged

Position Cylinder

Rod

Connector with

slotted hole

Slotted hole

Pin

Adjust

cylinder

stroke so

there is a

clearance on

both sides of

the pin when

in

engaged AND

disengaged

positions

Figure 21. Slotted Connector Used on Air Cylinder Rod

75



6. The air cylinder must be readjusted when the clutch is readjusted andany time the travel or position moves from the specifications describedabove.

Determine the length of travel for the engaging cylinder.

7. Multiply the length of the hand lever by the value shown in the followingchart. This provides the approximate required length of the piston stroke.

Note: The hand lever length is the distance from the center ofthe operating shaft to the point where the cylinder will beconnected to the lever.

Table 15. Engaging Stroke Travel at 25.4 mm. (1 in.)

SP111, SPE111 Series 8.255 .325

SP211, SPE211 Series 6.782 .267

ModelEngaging Stroke Travel at 25.4 mm (1 in.)

mm. inches

Determine the engaging force in pounds required at the cylinder.

8. Divide the force value in the chart below by the length of the hand lever(in inches). This provides the required force (in pounds) that must beprovided by the piston.

Note: Periodically disconnect the power cylinder to measure theclutch engagement force. Refer to Clutch Adjustmentin the Maintenance section.

Table 16. Engaging Force Required at Cylinder at 25.4 mm. (1 in.)

SP111, SPE111 Series 6850 1540

SP211, SPE211 Series 8585 1930

SP311 Series 11009 2475

ModelEngaging Force Required in Cylinder

force (newtons) force (pounds)

76



Notes

77

Twin Disc, Incorporated Operation


Operation

General Information

Model SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211 SeriesPower Take-Offs consist of a manually engaged and disengaged disconnectclutch mounted on an output shaft in a cast iron housing that is bolted to theengine. Clutch engagement and disengagement is accomplished by meansof an operating lever on the outside of the pto housing, which actuates aninternal linkage mechanism.

A drive ring is bolted to the engine flywheel. Internal teeth of the drive ringmesh with external teeth of the clutch driving plate(s). These are the inputcomponents of the Power Take-Off. Input components always rotate at enginerpm.

Output components of the Power Take-Off consist of a clutch hub that ismounted on the output shaft, a linkage mechanism for clutch engagementand disengagement and clutch adjustment components. Clutches designedwith multiple clutch driving plates have a clutch center plate located betweenthe friction plates. The clutch center plate and pressure plate are driventhrough internal teeth that mesh with external teeth on the clutch hub. Untilclutch engagement is initiated while the engine is running, the outputcomponents do not rotate.

During clutch engagement, the clutch pressure plate is moved to clamp theclutch driving plate(s) against the friction face of the clutch hub (or the centerplate(s). The internal engagement mechanism of the clutch locks the clutchpressure plate in the engaged position to complete the drive. Thus, at fullclutch engagement, the output shaft is driven at engine speed.

Grease- or oil-lubricated main bearings are located in the pto housing and/or bearing carrier. Most designs include a pilot bearing mounted in the engineflywheel to support the front end of the clutch shaft. However, some designsincorporate a main bearing configuration that does not require use of a pilotbearing.

A support plate bolted to the bearing carrier of some units is required toprovide sufficient support where heavy weight and/or side loads exist.

78

Twin Disc, IncorporatedOperation


Clutch Engagement Procedure

Normal clutch engagement

Do not start the engine with the nameplate removed.

The PTO clutch should normally be engaged with the engine at the lowestrpm possible. The clutch should be engaged quickly to avoid an extendedperiod of slippage during engagement. The clutch should be engaged withthe engine operating below 1,000 rpm.

After the clutch is fully engaged and the load has been brought up to engineengagement speed, the engine rpm may be increased to operating speed.

Clutch engagement where high inertia loads exist

Twin Disc, Inc. recommends that the PTO installation be designed to allowclutch engagement at 1,000 rpm or below. Under extreme circumstances,where high inertia loads must be picked up, the engine may have to beoperated at higher speeds while the engagement occurs, as engaging theclutch at 1,000 rpm or below may result in stalling the engine.

Clutch engagement should occur at the lowest possible engine rpm.

Heavy inertia loads may be brought up to engine speed by a series of shortclutch engagements and disengagements (sometimes referred to as�bumping�) at intervals long enough to gradually increase the speed of theload, yet prevent excessive heat build-up in the friction facings.

After the clutch is fully engaged and the load has been brought up to engineengagement speed, the engine rpm may be increased to operating speed.

Under no circumstances should the clutch be slipped for more than asecond or two without either fully engaging or disengaging the clutchto permit it to cool.

79

Twin Disc, Incorporated Operation


Clutch engagement to clear a jammed driven device

Never engage the PTO to unjam a stuck load. Doing so could result ininjury to the operator, and damage to the equipment.

Always shut the engine off and disengage the clutch before clearing a jammedload. The jam should be cleared, and the output shaft must be rotated to becertain that the jam is completely removed before starting the engine andengaging the PTO.

Operator should be aware of the required clutch engagement force

The clutch engagement force must be at the proper level to realize long lifeof the PTO clutch. If this engagement force seems low, refer to the ClutchAdjustment Procedure in the Maintenance section of this manual.

Insufficient clutch engagement force can cause clutch slippage resultingin catastrophic clutch failure.

The engagement lever must be located in the proper position to preventpremature failures of the internal throwout collar components. Theengagement lever should be in the vertical position with the clutch engaged.See Hand Lever Position for Twin Disc Power Take-Offs in the Installationsection of this manual.

Improper handle position can cause throwout collar failure resulting incatastrophic failure of the clutch.

80

Twin Disc, IncorporatedOperation


Notes

81

Twin Disc, Incorporated Maintenance


Maintenance

Maintenance Tips

Tapered Roller Bearing Adjustment

1. Tapered roller bearing end play adjustment should have been adjustedprior to installation of the power take-off. Periodically check forexcessive shaft movement during clutch engagement anddisengagement and during operation to insure failure is not occurring.See information in the Installation section of this manual.

Pilot Bearings

2. Ball-type pilot bearings and Roller-type pilot bearings must be installedproperly. Some pilot bearings are to be greased periodically, SeeLubrication this Maintenance section.

Lubrication

3. Verify that the PTO is properly lubricated prior to starting the engineand at all times during operation. Refer to the Twin Disc PowerTake-Off Reference Listing in the Description and Specificationssection, Lubrication in this Maintenance section and EngineeringDrawings near the back of this manual.

Throwout bearing failures may be, among other causes, the result ofimproper lubrication.

Clutch Adjustment

4. Check frequently to insure that the clutch is adjusted according to theprocedure outlined in Clutch Adjustment in this Maintenance section.Failure to do so will result in premature clutch wear and failure.

Note: Twin Disc will not be responsible for any damage orinjury resulting from improper adjustment and/orlubrication. This includes any accessory drives andloads.

82

Twin Disc, IncorporatedMaintenance


Hand Lever Position

5. Throwout bearing failures may be, among other causes, the result ofimproper hand lever position. See Hand Lever Position for TwinDisc Power Take-Offs and Model SPE211 and SPE311 ArmAdjustment Procedure in the Installation section of this manual.

Alignment

6. The flywheel and flywheel housing alignment should have been setwithin specifications prior to installation of the power take-off and mustbe maintained for long service life of the components.

Misalignment of driven components can result in power take-off failure.Periodically check for bolts that may have loosened or drivencomponents that have not been properly aligned during servicing ormaintenance procedures. See information regarding Alignment inthe Installation section of this manual.

Support Plate

7. When mounting the engine and Power Take-Off in the machine, acustomer-supplied support plate may be required to support the outputend of the PTO housing. Proper installation and alignment of thesupport plate must be maintained.

Periodically check to insure that the bolts securing the support plateare tightened to specifications and that the support plate is properlyreinstalled and realigned whenever work is performed on the powertake-off or power package module. See the information aboutcustomer-supplied support plates and Twin Disc Support PlateSpecifications contained in the Description and Specifications sectionof this manual.

Failure to follow maintain this requirement may result in damage to thepower take off or the engine flywheel housing.

83



Belt or chain tension/Allowable Side Load Pulls

8. Maintain proper belt or chain tension adjustments. Avoid excessivelytight or excessively loose belts or chains. Failure to maintain properbelt or chain adjustment can cause bearing failure and shortenedpower take-off service life.

Deflection Caused by Side Load Pulls

9. Maintain proper side that do not exceed specified limits shown inAllowable Side Load Pulls in the Installation section and PTODeflection in the Description and Specifications section.

Air Engagement Mechanisms

10. Air engagement mechanisms remain properly adjusted at all times.See Setting Up Air Engagement on Twin Disc Power Take-Offs inthe Installation section.

84



Lubrication

Refer to the Twin Disc Power Take-Off Reference Listing, EngineeringDrawings and the illustrations below for location of fittings.

Grease Specifications

Use NLGI Grade 2 grease with a minimum 149° C. (300° F.) drop point for alllubrication.

Oil Specifications for oil-lubricated main bearings - SP211OP andSP311OP Series

Use a good grade MS, DG, or better SAE No. 30 engine oil.

Lubrication Locations

Collar

(grease)

Main

Bearings

(grease)

Operating

Shaft

(grease)

Config. C

Config. EConfig. F

Collar

(grease)

Check Oil

Level Oil Fill

Operating

Shaft

(grease)

Collar

(grease)

Main

Bearings

(grease)

Operating

Shaft

(grease)

Collar

(grease)

Main

Bearings

(grease)

Operating

Shaft

(grease)

Collar

(grease)

Main

Bearings

(grease)

Operating

Shaft

(grease)

Collar

(grease)

Main

Bearings

(grease)

Operating

Shaft

(grease)

Config. B

Config. D

Config. A

Figure 22. Lubrication Locations

85



Refer to BOM and Twin Disc Power Take-Off Reference Listing in theDescription and Specifications section of this manual.

Table 17.Quick-reference lubrication chart. Also see information above.

Throwout Collars 1cc Every 8-10 hrs. NLGI Grade 2 Grease

Main Bearings (Grease) Add 1cc Every 8-10 hrs. NLGI Grade 2 Grease

Main Bearings (Oil) To Fill level Every 8-10 hrs. MS, DG or better

(except SP311OP Series) on oil gauge Drain & fill SAE No. 30 Engine Oil

or bottom of 6 months/1000 hrs.

check plug

hole.

Operating Shaft 1cc 3 months/100 hrs. NLGI Grade 2 Grease

Pilot bearings 1cc 3 months/100 hrs. NLGI Grade 2 Grease

(Periodic lube)

Pilot bearings none required

(Pre-lubricated)

Clutch Linkage drop 500 hrs.

Item AmountCheck

IntervalNotes

Main Bearings

All Models SP111, SPE111, SP211, SPE211, SP311, RFD111 andRFD211 Series (except SP211OP, SPE211OP and SP311OPSeries)

Apply 1 cc of grease (one shot from a grease gun) before start-up and thenevery 8-10 hours operation thereafter, through the fitting on the flange of thebearing carrier (55).

Models SP211OP and SPE211OP SeriesThe tapered roller bearings are lubricated from oil contained in an oil cavityin the bearing carrier. The oil level should be checked and maintained every8-10 hours operation. Drain and refill the oil cavity every 6 months or 1000hours (whichever occurs first).

Models SP311OP SeriesThe tapered roller bearings are lubricated from engine oil continuouslysupplied through an orifice fitting in the bearing carrier. The oil drains backto sump through an opening in the bottom of the bearing carrier. No periodiccheck is necessary.

86



Operating Shaft Fittings

All Models SP111, SPE111, SP211, SPE211, SP311, RFD111 andRFD211 SeriesApply 1 cc. of grease (one shot from a grease gun) before starting and thenevery 3 months or 100 hours operation (whichever occurs first).

Throwout Collar

All Models SP111, SP211 SP311, RFD111 and RFD211 SeriesApply 1 cc. of grease (one shot from a grease gun) daily before start-up andthen every 8-10 hours operation thereafter, through the fitting on the taperedpart of the housing.

Models SPE111, SPE211 SeriesNo throwout collar is used. No lubrication is necessary.

Pilot Bearing

All Models SP111, SPE111, SP211, SPE211, SP311, RFD111 andRFD211 Series (except sealed-for-life style bearings).The pilot bearing supplied with most power take-offs is pre-lubricated andsealed for life. No maintenance is required. Inspection is recommended everytwo years or when the power take-off is removed from the driving componentfor servicing.

All Models SP111, SPE111, SP211, SPE211, SP311, RFD111 andRFD211 Series with sealed-for-life style bearingsIf the pilot bearing supplied with your power take-off is to be periodicallylubricated, add one shot of grease from a grease gun every 100 hours throughthe fitting in the output end of the clutch shaft. Do Not Overgrease!!

Clutch Linkage

All ModelsLubricate the clutch linkage mechanism, cotter pins, clevis pins and levers,with engine oil every 500 hours of operation.

Lubricate sufficiently but sparingly. Excess oil can splash or drip ontothe friction plates, causing clutch slippage that may result in clutchfailure.

87



Clutch Adjustment

Note: New power take-offs must have clutch adjustmentchecked before being placed into service and after thefirst 10 hours of operation. This includes any power take-offs with new friction plates. New plates have a wear inperiod and the clutch may require several adjustmentsbefore the new plates are worn in.

After wear in, clutch adjustment should be checked regularly. Heavy dutyapplications (rock crushers, etc.,) which have frequent engagements,numerous engagements in an operating day or relatively long periods of sliprequire more frequent readjustment than light duty applications.

Adjust the clutch BEFORE it overheats, does not pull, or the operating leverjumps from the engaged position. But these symptoms are indications thatclutch adjustment is required.

Adjustment measurements are made by fitting a torque wrench with a 1 1/2�socket over the hex end located at the bottom of the hand lever. Grasp onlythe torque wrench when making measurements.

1. Disconnect any power engagement devices from the operating shaftif so equipped.

To adjust the clutch:

Refer to the exploded views in the illustrations section of this manual.

2. Remove the instruction cover plate (45) from the housing (44) andturn the clutch shaft until the adjusting ring lock pin (25) can bereached.

3. Disengage the adjusting lock pin and insert a cotter pin or small nailinto the hole provided to hold it in the disengaged position. Turn theadjusting yoke (26) to the right (or clockwise when looking at theflywheel) until the required peak torque is required at the operatingshaft (55) to engage the clutch. Refer to the Description andSpecifications section of this manual for correct peak torque.

88



4. Remove the cotter pin or small nail. Re-engage the adjusting ringlock pin.

5. Repeat steps 3 and 4 above as necessary until the proper torquereading is obtained. Replace the instruction cover plate and securewith two hex-head capscrews (46). Securely tighten.

89



Friction Plate Replacement

Refer to the exploded views in the illustrations section of this manual.

Common symptoms indicating that the friction plates (6) are worn out are:

1. The adjusting yoke (26) cannot be turned clockwise any further.

2. The friction face surfaces have worn flush with the rivet heads, or therivets are loose.

It is necessary to remove and disassemble the clutch assembly to replacethe friction plates. Refer to instructions in the Disassembly and Assemblysections of this manual.

Split-type friction plates are not recommended for use in SP311 Seriespower take-offs.

90



Field Adjustment - Tapered Roller Bearing End Play (side-loaded ptoapplications)

Refer to exploded views in the illustrations section of this manual.

All SP111, SPE111, SP211, SPE211, SPE211, SP311, RFD111 andRFD211 Series (except SP311IL Series):The only approved method for field adjustment of tapered roller bearings(39, 40, 41, 42) in Twin Disc Power Take-Off units is by the use of a dialindicator to read actual bearing end play.

SP311IL Series:There is no adjustment of ball-type bearings.

Adjustment:Refer to the procedure in (Final Setting) Measure and Set Bearing EndPlay as described for your bearing housing configuration in the Assemblysection of this manual.

Refer to the illustration below and Standard End Play setting for TaperedRoller Bearings used with Side-Load Applications in the Description andSpecifications section.

Use a Hoist

and swivel

hook.

Dial indicator

Figure 23. Dial indicator and power take-off position for measuringand setting bearing end play.

91



Field Adjustment - Tapered Roller Bearing End Play (in-line ptoapplications)

Refer to exploded views in the illustrations section of this manual.

All SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211Series (except SP311IL Series):The only approved method for field adjustment of tapered roller bearings(39, 40, 41, 42) in Twin Disc Power Take-Off units is by the use of a dialindicator to read actual bearing end play.

1. Field experience for tapered roller bearings used with in-line driveinstallations indicates that extra care must be taken when adjustingthe power take-off tapered roller bearings.

2. The end play settings for these in-line applications may be differentthan for the side load applications.

3. Bearing end play for these special applications must be adjusted byusing the method described for side-loaded applications on theprevious pages. However, the amount of end play must be setaccording to the specifications shown in Bearing End Play settingfor Tapered Roller Bearings used with In-Line applications in theDescription and Specifications section.

Note: SP111, SPE111 and RFD111 Series only: The taperedroller bearing end play requirement is the same for bothside-load and in-line applications.

Note: SP311IL Series: There is no adjustment of ball-typebearings.

92



Notes

93

Twin Disc, Incorporated Disassembly


Disassembly

The following procedure is for complete disassembly of the unit. Prior to thisprocedure, the power take-off should be removed from the engine. Qualifiedpersonnel should do the work in a fully equipped facility.

Note: Illustrations used here are to aid in understanding andcompleting the procedure, and may not appear to beconsistent with the previous disassembly steps.

Note: Six main bearing housing configurations are illustrated.Refer to the Twin Disc Power Take-Off ReferenceListing in the Description and Specifications section todetermine which configuration is used in your PTO.

94

Twin Disc, IncorporatedDisassembly


Power Take-Off Removal From The Engine

Refer to the Twin Disc Power Take-Off Reference Listing in the Descriptionand Specifications section, the exploded views in the Illustrations sectionand Engineering Drawings near the back of this manual.

1. Remove all attached parts from the output end of the power take-off.

2. Remove the hex nut and hex-head capscrew securing the hand lever tothe operating shaft.

3. If used, loosen the support plate from the base mounting.

4. Remove the shaft key.

5. Attach lifting equipment to the power take-off and take out the slack justenough to begin to support the weight of the pto. Do not apply too muchforce.

Lifting devices and their capacity must be capable of supporting theweight of the power take-off and all attached devices and equipment.Suspend the pto with the lifting devices securely attached at 3 positions(minimum) so it remains with the main drive shaft in a horizontal positionuntil it is safely lowered and resting on a secure bed.

6. Remove the twelve hex-head capscrews securing the power take-off tothe engine flywheel housing. Use two bolts (3/8�-16 UNC x 1 1/2� or7/16�-16 UNC x 1 1/2�) as pusher screws in the two tapped holesprovided in the housing flange. Use the pusher screws to separate thepto from the engine flywheel housing. Remove the power take-off fromthe engine.

7. Remove the eight hex-head capscrews securing the drive ring to theengine flywheel.

95



Clutch Removal


1. Support the power take-off on a bench with the clutch end facing up.Use wooden blocks under the power take-off.

2. If the pilot bearing (or pilot bearing inner race) remained on the shaft,remove it using a standard bearing puller.

3. If the pilot bearing is a two-piece bearing, remove the bearing�s outerrace from the flywheel using a standard bearing puller.

Note: The pilot bearing will be destroyed upon removal. If thebearing seal is broken the bearing is considereddestroyed.

4. Remove the two hex- head capscrews and remove the instruction plateif they were not previously removed.

5. Use a 15/16� wrench to remove the jam nut and lock washer from thehose fitting located on the side of the power take-off housing. Push thefitting and hose into the power take-off housing.

6. Straighten the bent portion of the hub nut lock washer. Use a 4� wrenchor socket to remove the hub nut from the clutch shaft. Remove the hubnut lock washer.

7. Use a gear puller with threaded legs for tapped holes to pull the clutchassembly from the clutch shaft. Install the puller so the threaded legsscrew into the holes provided in the hub-and-back plate, usually 1/2�-13UNC, and the jackscrew exerts force on the end of the clutch shaft.

The thread puller holes are not to be used as jackscrews.

Remove the clutch and puller from the clutch shaft. Remove the hub keyif it was not removed with the clutch.

Note: Certain pto models, such as BOM SP111P325 may usespecial components as part of the clutch operationmechanism. Remove those components that are mountedon the inside of the pto housing.

96



Clutch Disassembly


All 11 1/2-inch model clutches

1. Set the clutch assembly on a bench with the throwout collar facing up.Disengage the clutch.

2. Remove the grease fitting (23) from the hose fitting (20). Remove thehose (19) and hose fitting (18) from the trunnion of the collar assembly.

3. Remove the three cotter pins (17) from the three clevis pins (16) securingthe sliding sleeve to the links (15).

Note: BOMs such as SP111C016 and SP211C022 only:Remove three hex nuts (110), three shoulder screws (108)and washers (109).

4. Remove the sleeve and collar assembly from the links.

Note: Models SPE111 and SPE211, such as BOM SP111P325,do not use a release collar assembly.

Bronze Collar Disassembly

5. Remove two hex huts and two hex head bolts to remove the throwoutcollar halves and shims (older style only) from the sliding sleeve.

Ball Bearing Collar Disassembly

6. Remove the internal snap ring (31) from the sleeve side of the collar andlet it hang on the sleeve.

7. Tap the collar from the release bearing (30).

8. Remove the external snap ring (29) from the sliding sleeve (27).

9. Press the sleeve from the bearing in a press or pull the bearing from thesleeve.

97



10. Remove the snap ring from the sleeve.


11. Pull the adjusting lock pin (25), compressing the lock pin spring (24),and unscrew the adjusting ring (26) from the hub-and-back plateassembly. Remove the adjusting lock pin and spring from the adjustingring.

12. Straighten and remove the three cotter pins (12), three washers (10)and three clevis pins (11) that secure the levers to the pressure plate(8). Remove three levers from the pressure plate.

Note: BOMs such as SP111C016 and SP211C022 only:Remove three hex nuts (106), three shoulder screws (103)three washers (104) and three washers (105).

13. Straighten and remove the three cotter pins (13) and the three clevispins (14) to disconnect the six links from the three levers (9).

Note: BOMs such as SP111C016 and SP211C022 only: Donot remove the links (15) from the clutch levers (9). Theseitems are not serviced separately. Discard if unusable.

14. Remove the pressure plate and drive plate (6) from the hub-and-backplate (4).

Two- and three- plate 11 1/2-inch model clutches only

16. Remove the remaining driving plate(s) (6) and center plate(s) (7) fromthe hub-and-back plate.


17. If used, remove the three compression springs (76 & 77) from thepockets in the hub-and-back plate.

Certain 11 1/2-inch model clutches such as BOM SP111C016

18. Remove the wear pads, compression springs and plungers from thepockets and bores of the sliding sleeve and the hub-and-back plate.

98



Remove the Operating Shaft and Throwout Yoke

Refer to the BOM and exploded views in the Illustrations section of this manual.Refer to the Twin Disc Power Take-Off Reference Listing in the Descriptionand Specifications section to determine which configuration is used in yourPTO.

SPE111 and SPE211 Series only: (SP111, SP211, SP311, RFD111 andRFD211 Series skip to step 5)

Snap Ring

(79)

Neutral

Lock Arm

(80)

Spring

(81)

Roller Pin

(82)

Hex Head

Capscrew

(86)

Retaining

Ring

(83)

Hex Head

Capscrew

(87)

Detent

Locator

(88)

Washer

(85)

Clevis Pin

(89)

Throwout

Fork

(54)Set Screw

(91)

Roller

(90)

Operating

Shaft

(55)

Key

(56)

Hex Nut

(93)Camrol

(92)

Figure 24. Illustration - SPE Release Mechanism Components

1. Remove the two hex nuts (93) from the Camrols (92) and remove theCamrols from the throwout yoke (54).

2. Remove the external snap ring (79) from the roller pin (81) and removethe roller pin, roller (84) and spring (81) from the neutral lock arm (80).

3. Remove the retaining ring (83) from the headed pin (89) and removethe headed pin and roller (84) from the roller pin (82).

4. Remove two hex head capscrews (85) from the locator detent (88) andremove the detent from the clutch housing (44).

99



All SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211Series

5. Remove the hex-head capscrew from the throwout yoke (54). Tap oneend of the operating shaft (55) gently to expose one of the woodruffkeys (56). Remove the key. Do the same for the other side of the shaft toremove the other key. Remove the operating shaft from the clutch housing(44) and throwout yoke.

6. Remove the two grease fittings (57) from the outside of the housingnear the operating shaft holes only if replacement of the parts isnecessary.

Proceed to Clutch Shaft and Housing Disassembly:Six main bearing configurations are illustrated. Refer to the Twin Disc PowerTake-Off Reference Listing in the Description and Specifications section todetermine which configuration is used in your PTO.

Skip to:Clutch Shaft and Housing Disassembly - Bearing Housing Configuration AClutch Shaft and Housing Disassembly - Bearing Housing Configuration BClutch Shaft and Housing Disassembly - Bearing Housing Configuration CClutch Shaft and Housing Disassembly - Bearing Housing Configuration DClutch Shaft and Housing Disassembly - Bearing Housing Configuration EClutch Shaft and Housing Disassembly - Bearing Housing Configuration F

100



Clutch Shaft and Housing Disassembly - Configuration A

Refer to the BOM and exploded views in the Illustrations section of this manual,and the main bearing configuration illustrations below.

Hex Head

Capscrew

(35)

Washer

(36)

Retainer

Clip

(37)

Bearing

Retainer

(38)

Bearing

Cup

(39)

Bearing

Cone

(41)

Plug

(43)

Bearing

Cone

(40)

Bearing

Cup

(42)

Fitting

(57)

Housing

(44)

Figure 25. Illustration - Main Bearing Housing Configuration A

1. Position the pto on the bench with the input end up.

2. Remove the hex head capscrew (35), lock washer (36) and the retainerclip (37) so the bearing retainer (38) may be rotated.

3. Rotate the bearing retainer counter-clockwise to remove it.

4. Lift the clutch shaft (33) with the two bearing cones (40 & 41) from thehousing. The forward bearing cup (39) will come out with the shaft andbearing cones.

5. Use an arbor press to remove the bearing cones from the clutch shaft.The bearing cones remove in opposite directions from the shaftshoulder.

6. Remove the rear bearing cup (42) from the housing by removing thethree plugs (52) (if used) from the access holes in the housing and tappingthe race from the bore through the holes using a blunt punch.

7. Remove the grease fitting (51) from the housing.

101



Clutch Shaft and Housing Disassembly - Configuration B


Hex Head

Capscrew

(35)

Front Bearing

Retainer

(38)

Bearing

Cone

(40)

Bearing

Cup

(39)Bearing Cone

(41)

Bearing Cup

(42)

Internal Bearing

Spacer

(58)

Washer

(60)

Hex Head

Capscrew

(65)

Seal Plate

(64)

Nut

(62)

External Bearing

Spacer

(59)

Washer

(61)

Housing

(44)

Figure 26. Illustration - Main Bearing Housing Configuration B

1. Position the pto housing on the bench with the output end facing upward.

2. Remove the three hex head capscrews (65) that secure the rear sealplate (64) to the housing (44).

3. Remove the rear seal plate.

4. Turn the pto housing over on the bench with the input end facing upward.

5. Remove the six hex head capscrews (35) that secure the bearing retainer(38) to the housing.

6. Remove the bearing retainer from inside the housing.

102



7. Lift the clutch shaft (33) from the housing. The forward bearing cup (39)and cone (40), the internal and external bearing spacers (58 & 59), therear bearing cup (42) and cone (41) and the rear lock nut (62) andwashers (60 & 61) will come out with the shaft.

8. Remove the lock nut and washers that secure the rear bearing cone onthe shaft.

Note: Hold the shaft securely without damaging it. The nut isinstalled with 678-813 Nm (500-600 lb.-ft.) torque.

9. Remove the rear bearing cup and cone, then the internal and externalbearing spacers and the front bearing cup and cone from the shaft.

103



Clutch Shaft and Housing Disassembly - Configuration C


Oil

Slinger

(66)

Front

Wear

Sleeve

(67)

Bearing

Carrier

(47)

Hex Head

Capscrew

(48)

O-Ring

Seal

(50)

Rear

Seal

(70)

Wear

Sleeve

(69)

Pipe

Plug

(52)

Filler/

Breather

(72)

Drain

Plug

(71)

Front

Oil

Seal

(68)

Bearing

Retainer

(38)

Hex Head

Capscrew

(35)

Lock

Plate

(36)

Bearing Cup

(42)

Bearing

Cone

(40)

Bearing Cup

(39)

Bearing

Cone

(41)

Shims

(63)

Housing

(44)

Fitting

(57)

Figure 27. Illustration - Main Bearing Housing Configuration C

1. On later production units, remove the oil gauge (74) from the oil gaugetube (73) in the bearing retainer (47).

2. Turn the power take-off housing with attached parts over on the bench.Support the housing so the output end of the clutch shaft faces up and isfree to rotate. There should be a clearance below the input end of theclutch shaft.

3. Remove the oil gauge tube from the bearing carrier only if replacementof either is necessary.

4. Remove hex head capscrews (48) and remove the support plate if used.

5. Lift the clutch shaft (33) and bearing carrier (47) unit from the clutchhousing (44). Remove and discard the rubber seal (50) located at thebearing carrier pilot.

104



6. Secure the clutch shaft with attached parts in a large vise with protectivejaws, with the input end of the shaft facing up, gripping the rear castsection of the bearing carrier in the vise.

7. Remove the oil slinger (66) from the shaft using a gear puller.

8. Remove the six capscrews (35), locking plates (36), bearing retainer(38) and shims (63).

9. Lift the clutch shaft with bearing cones (40 & 41) and 2 wear sleeves (67& 69) from the bearing carrier. The forward bearing cup (39) will comeout with the shaft and bearing cones.

10. Use an arbor press or bearing puller to remove the bearing cones fromthe clutch shaft. The bearing cones remove in opposite directions fromthe shoulder machined on the clutch shaft. The two wear sleeves will beremoved when the cones are removed.

11. Remove the rear bearing cup from the bearing carrier by removing thetwo 1/8 pipe plugs (52) from the bearing carrier and tapping the bearingcup (42) from the bearing carrier through the holes using a blunt punch.

12. Knock the oil seal (70) out of the bearing carrier (47).

13. Lay the clutch housing on its side and tap out the oil seal (68) using ablunt-end punch.

14. Remove the pipe reducer, if used, and breather (72) from the bearingcarrier.

105



Clutch Shaft and Housing Disassembly - Configuration D


Ball

Bearing

(40)

Bearing

Retainer

(38)

Bearing

Carrier

(47)

Hex Head

Capscrew

(48)

Internal

Snap Ring

(75)

Ball

Bearing

(41)

Washer

(49)

Fitting

(57)

Housing

(44)

Figure 28. Main Bearing Housing Configuration D


2. Remove hex head capscrews (48) and washers (49) and remove thesupport plate.

3. Lift the clutch shaft (33) and bearing carrier unit from the clutch housing(44).

4. Secure the bearing carrier with attached parts in a large vise withprotective jaws, with the input end of the shaft facing up, gripping therear cast section of the bearing carrier in the vise.

5. Remove the internal snap ring (75) from the bearing carrier (47).

6. Remove the bearing retainer (38) from the bearing carrier.

106



7. Lift the clutch shaft with the two ball bearings (40 & 41) from the bearingcarrier.

8. Use an arbor press to remove the bearings from the clutch shaft. Thebearings remove in opposite directions from the shaft shoulder.

9. Remove the grease fitting (51) from the bearing carrier.

107



Clutch Shaft and Housing Disassembly - Configuration E


Bearing

Cup

(39)

Bearing

Retainer

(38)

Bearing

Carrier

(47)

Hex Head Capscrew (48)

& Washer (49)

Retainer

Clip

(37)

Hex Head

Capscrew

(35)

Washer

(36)

Bearing

Cone

(41)

Plug

(52)

Fitting

(57)

Bearing

Cup

(42)

Bearing

Cone

(40)

Housing

(44)

Figure 29. Main Bearing Housing Configuration E


2. Remove hex head capscrews (48) and washers (49) and remove thesupport plate if used.

3. Lift the clutch shaft (33) and bearing carrier (47) unit from the clutchhousing (44).


5. Remove the hex head capscrew (35), lock washer (36) and the retainerclip (37) so the bearing retainer (38) may be rotated.

6. Rotate the bearing retainer counter-clockwise to remove it.

108



7. Lift the clutch shaft with the two bearing cones (40 & 41) from the bearingcarrier. The forward bearing cup (39) will come out with the shaft andbearing cones.


9. Remove plugs (52) (if used) and remove the rear bearing cup (42) fromthe bearing carrier by tapping the race from the bearing carrier throughthe holes using a blunt punch.

10. Remove the grease fitting (51) from the bearing carrier.

109



Clutch Shaft and Housing Disassembly - Configuration F


Bearing

Cup

(42)

Bearing

Retainer

(38)

Bearing

Carrier

(47)

Hex Head

Capscrew

(48)

Hex Head

Capscrew

(35)

Washer

(36)

Bearing

Cone

(41)

Front

Oil Seal

(68)

Shims

(63)

O-Ring Seal

(78)

Washer

(49)

Rear Oil

Seal

(70)

Fitting

(32)

Bearing

Cup

(39)

Bearing

Cone

(40)

Fitting

(57)

Plug

(52)

Housing

(44)

Figure 30. Main Bearing Housing Configuration F


2. Remove hex head capscrews (48) and washers (49) and remove thesupport plate.

3. Lift the clutch shaft (33) and bearing carrier (47) unit from the clutchhousing (44).


5. Remove the hex head capscrews (35) that secure the bearing retainer(38) to the bearing carrier (47).

6. Remove the bearing retainer and shims (63).

7. Knock the front oil seal (68) out of the bearing retainer and remove theo-ring seal (78).

110



8. Lift the clutch shaft with the two bearing cones (40 & 41) from the bearingcarrier. The forward bearing cup (39) will come out with the shaft andbearing cones.


10. Remove the rear bearing cup (42) from the bearing carrier by removingthe pipe plugs (52) (if used) from the rear side of the bearing carrier andtapping the race out using a blunt punch through the holes .

11. Remove the fitting (32) from the bearing carrier.

12. Remove the rear oil seal (70) from the bearing carrier.

Note: It is not necessary to remove the steel balls from thepassageways of the bearing carrier. They are installedas an integral part of the manufacturing process.

111

Twin Disc, Incorporated Cleaning and Inspection


Cleaning and Inspection

Cleaning and Inspection

Refer to the BOM, the exploded views in the Illustrations section andEngineering Drawings near the back of this manual.

Bearings

1. Thoroughly wash bearings in clean solvent if they have been in service.Soak bearings in solvent if they are particularly dirty.

Never dry bearing with compressed air. Do not spin bearings whilethey are not lubricated. Oil bearings with SAE 10 engine oil immediatelyafter cleaning. Be sure bearings are oiled before inspection. Protectclean bearings, whether they are new or have been in service, fromdirt, dust, grit or any other contaminant.

2. Inspect bearings for roughness of rotation. Replace the bearing ifroughness is found.

3. Inspect bearings for corrosion, scored, scratched, cracked, pitted orchipped races, and for indication of excessive wear of balls or rollers.If one of the these defects is found, replace the bearing.

Preventing Entrance of Dirt Into Bearings

4. Dirt and grit in bearings are often responsible for bearing failure.Consequently, it is important to keep bearings clean. Do not removegrease from new bearings. Keep the wrapper on new bearings untilimmediately before they are to be installed. Do not expose new cleanbearings until they are ready to be used in the assembly. Keep themwrapped in clean lint-free cloth or paper to keep out dust and debris.Protect bearings from contamination even after they are installed onthe shaft or in the bore.

112

Twin Disc, IncorporatedCleaning and Inspection


Housings, Cast Parts and Machined Surfaces

5. Replace cast parts or housings that are cracked.

6. Inspect bearing bores for grooved, burred or galled conditions thatwould indicate that the bearing has been turning in its housing. If thedamage cannot be repaired to like-new condition with a crocus cloth,replace the part. Bore diameters must not exceed the maximumdimension shown in Wear Limits in the Description and Specificationssection of this manual.

Typical Bearing Carrier or Housing bore area

Closely check bearing

bore for damage. Check threads or pilot

for damage.

Check face for

damage.

Figure 31. Inspect the bores, threads and faces

7. Inspect bores for wear, grooves, scratches and dirt. Remove burrsand scratches with crocus cloth or a soft stone. Replace parts thatare deeply grooved or scratched.

8. Inspect oil and grease passages for obstructions. If an obstruction isfound, remove it with compressed air or by working a wire or wirebrush back and forth through the passage and flushing it with solvent.

All grease and oil

p a s s a g e w a y s

must be clean.

Figure 32. Be sure passageways are clean.

113

Twin Disc, Incorporated Cleaning and Inspection


Shafts, seal lip contact surfaces and bearing journals

9. Inspect machined surfaces for burrs, scratches, nicks and foreignmatter. If such defects cannot be removed with crocus cloth or a softstone, replace the part.

10. Inspect bearing journals on the shaft for grooved, burred or galledconditions that would indicate that the bearing has been turning onthe shaft. If the damage cannot be repaired to like-new condition witha crocus cloth, replace the part. Bearing journal diameters must notbe less than the dimensions shown in Wear Limits in the Descriptionand Specifications section of this manual.

11. Inspect the pilot bearing journal on the clutch shaft. If it is worn in anyway, or if it shows signs that the pilot bearing has been turning on thejournal, replace the clutch shaft. Pilot bearing journal diameters mustnot be less than the dimensions shown in Wear Limits in theDescription and Specifications section of this manual.

1

2

3

4

Figure 33. Inspect bearing journals and seal journals

114

Twin Disc, IncorporatedCleaning and Inspection


12. Inspect seal journal surfaces on the shaft. Look especially for scratchesor nicks that extend above the shaft surface. If they cannot be removedusing a fine crocus cloth, replace the part. Seal journal diametersmust not be less than the dimensions shown in Wear Limits in theDescription and Specifications section of this manual.

13. Inspect seal lip contact surfaces on wear sleeves and other surfaces.Look especially for scratches or nicks that intersect with or cross thelip contact area. If they cannot be removed using a very fine crocuscloth, replace the part.

14. Inspect threaded openings for damaged threads. Chase damagedthreads with a tap of the correct size.

15. Be sure the snap ring grooves have straight sides, especially if abearing failure has occurred.

Undamaged Groove Damaged Groove

Straight sides Damaged Wall

Figure 34. Snap ring grooves must have square sides

115

Twin Disc, Incorporated Assembly


Assembly

The following procedure is for complete disassembly of the unit. Prior to thisprocedure, the power take-off should be removed from the engine. Qualifiedpersonnel should do the work in a fully equipped facility.

Note: Illustrations used here are to aid in understanding andcompleting the procedure, and may not appear to beconsistent with the previous assembly steps.

Note: Six main bearing configurations are illustrated. Refer tothe Twin Disc Power Take-Off Reference Listing inthe Description and Specifications section to determinewhich configuration is used in your pto.

116

Twin Disc, IncorporatedAssembly


Clutch Assembly


All SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211Series (except BOMs such as SP111C016 and SP211C022-skip tostep 9.)

Bronze Throwout Collar only: (Ball Bearing Type Throwout Collar skip tostep 4.)

1. (Design used on some older models only.) Install the woodruff key in theslot of the sliding sleeve and install the collar ring with the keyway alignedwith the woodruff key. Install the external snap ring to secure the collarring on the sleeve.

Sliding Sleeve

Collar Ring

Key

Snap Ring

Figure 35. Older Style Sliding Sleeve

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2. Lubricate the shoulder of the sliding sleeve (27) with No. 30 engine oilprior to installation of the split collar. Place the throwout collar halvesover the sliding sleeve shoulder. Install 2 hex head capscrews 1/2� - 20x 3 1/4� through the halves. Install 2 hex nuts on the capscrews. Torquethe capscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.

Sliding

Sleeve

Nut

Capscrew

Collar

Halves 2322

21

20

19

18

Figure 36. Assembly of Bronze Throwout Collar

3. Check collar rotation to be sure it turns freely on the sliding sleeve.(Proceed at step 14.)

Ball Bearing Type Throwout Collar

4. Place the sliding sleeve (27) on the bed of a press with the bearing endup. Place the external snap ring (31) on the sleeve before the bearing(30) is installed.

Figure 37. Assembly of Ball Bearing Type Throwout Collar

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5. Press the ball bearing (30) on the sleeve. Press tight to stop against theshoulder.

Note: Pack the bearing with grease before installing it on thecollar.

Note: Apply force only against the inner race of the bearing.Pressing against the outer race or contact with the ballswill damage the bearing, leading to premature failure.

6. Install the external snap ring (29) to secure the bearing.

7. Install the throwout collar (28) over the bearing. Seat the collar tightagainst the bearing.

Excessive pressure or sharp impact against the outer race of thebearing during installation of the collar will damage the bearing, leadingto premature failure.

8. Turn the sliding sleeve assembly over on the bed of the press. Install theinternal snap ring (31) in the collar. (Proceed at step 14.)

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BOMs such as SP111C016 and SP211P022 only:

9. Install the two plungers (100) in the holes in the sides of the sliding sleeve(27). The plungers must extend through the holes into the internal boreof the sliding sleeve.

10. Install springs (101) in the holes against the plungers.

11. Compress the springs while installing the roll pins (102). The roll pinsmust retain the springs and plungers in the holes.

12. Lubricate the shoulder of the sliding sleeve (27) with No. 30 engine oilprior to installation of the split collar. Place the throwout collar halvesover the sliding sleeve shoulder. Install 2 hex head capscrews 1/2� - 20x 3 1/4� through the halves. Install 2 hex nuts on the capscrews. Torquethe capscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.

Sliding

Sleeve

Nut

Capscrew

Collar

Halves 2322

21

20

19

18

Figure 38. Assembly of Bronze Throwout Collar

13. Check collar rotation to be sure it turns freely on the sliding sleeve.(Proceed at step 29.)

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Assemble the plate stack

14. Set the hub and back plate (4) on a bench with the threaded and splinedsection facing up.

15. Install a friction plate (6) on the hub-and-backplate.

Figure 39. Typical SP111, SP211 and SP311 Plate Stack (SP311 is shown)

SP211, SPE211, SP311 and RFD211 Series clutches only: (SP111,SPE111 and RFD111 Series Clutches, skip to step 20.)

16. Install a center plate (7) so it rests flat on the friction plate, meshing thesplines of the center plate and hub-and-backplate.

17. Install a second friction plate (6) on the center plate.

SP311 Series clutches only: (SP211, SPE211 and RFD211 Seriesclutches, skip to step 20.)

18. Install a second center plate (7) so it rests flat on the second frictionplate, meshing the splines of the center plate and hub-and-backplate.

19. Install a third friction plate on the second center plate.

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All SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211Series

20. Install the pressure plate (8) on the top friction plate, meshing the splinesof the center plate and hub-and-backplate.

21. Install the adjusting lock pin spring (24) into the pocket in the pressureplate and install the adjusting lock pin (25) on the spring.

Figure 40. Illustration - Levers, Links, Sleeve, Throwout Collar

22. Push down on the pin, compressing the spring while screwing theadjusting yoke (26) partially onto the threaded part of the hub-and-backplate.

23. Place the levers (9) between the lugs of the pressure plate and secureto the pressure plate with three clevis pins (11).

Note: Hook each lever under the edge of the adjusting yoke whilealigning the clevis pin hole with the holes in the pressureplate lugs.

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24. Place a washer (10) on each clevis pin and install three cotter pins (12).Spread the legs of the cotter pins as shown below.

Note: The head of the clevis pin must be in the clockwise sideof the lug when viewing it from the top (sliding sleeve)side.

Note: Models SP111, SP211, RFD111 and RFD211 clutchesare different from SP311 clutches.

11.9 mm. (0.47 in.) Radius (12)

9.65 mm. (0.38”) Radius (13 & 17)

Legs do not

extend outside

this area.

23.9 mm. (0.94 in.) Diameter (12)

19.3 mm. (0.76 in.) Diameter (13 & 17)

Figure 41. Spread the cotter pin legs - SP111, SP211, RFD111 & RFD211

14.7 mm. (0.58 in.) Radius (12)

11.9 mm. (0.47 in.) Radius (13 & 17)

Legs do not

extend outside

this area.

29.4 mm. (1.16 in.) Diameter (12)

23.8 mm. (0.94 in.) Diameter (13 & 17)

Figure 42. Spread the cotter pin legs - SP311

25. Attach six lever links (15) one on each side of each of the three clutchlevers (9). Secure with three clevis pins (14) and three cotter pins (13).

26. Place the pre-assembled sliding sleeve (27) on the adjusting yoke,aligning the three lugs between the three pairs of lever links.

27. Attach the links to the sliding sleeve with three clevis pins (16) and threecotter pins (17).

28. Install the hose fitting (18) in the collar trunnion, and attach the flexiblehose (19), hose fitting (20) and lubrication fitting (23).

(Proceed to step 48)

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Assemble the plate stack

29. Set the hub and back plate (4) on a bench with the threaded and splinedsection facing up.

Figure 43. BOMs such as SP211C022 and SP211C016 Spring Locations(SP211C022 is shown)

30. Install the inner compression springs in the pockets in the (either threeor four) pockets in the hub-and-backplate.

BOMs such as SP211C022 only: (BOMs such as SP111C016, skip tostep 32.)

31. Also install the four outer compression springs (77) in the pockets, overthe inner springs (76).

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32. Install a friction plate (6) on the hub-and-backplate.

Figure 44. Plate Stack SPE Clutch (BOM SP111C016 is shown)

BOMs such as SP211C022 only: (BOMs such as SP111C016, skip tostep 36.)

33. Install a center plate (7) so it rests flat on the friction plate, meshing thesplines of the center plate and hub-and-backplate.

34. Install a second friction plate (6) on the center plate.

BOMs such as SP111C016 and SP211P022:

35. Install the plunger (97) in the hole in the side of the hub and back plate(4). The plunger must extend through the hole into the internal bore.

36. Install spring (98) in the hole against the plunger.

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37. Install the wear pad (99) against the spring. The wear pad must insertinto the spring.

38. Install the pressure plate (8) on the top friction plate, meshing the splinesof the center plate and hub-and-backplate.

Note: While installing the pressure plate, push the wear pad (96)to compress the spring (97).

39. Install the adjusting lock pin spring (24) into the pocket in the pressureplate and install the adjusting lock pin (25) on the spring.

Figure 45. Illustration - Levers, Links, Sleeve, Concial Spring, Throwoutcollar - BOMs such as SP111C016 & SP211C022

40. Push down on the pin, compressing the spring while screwing theadjusting yoke (26) partially onto the threaded part of the hub-and-backplate.

41. Install the conical spring (111) on top of the hub and back plate (4). Thesmall end of the spring must extend downward into the internal bore.

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42. Place the levers (9) between the lugs of the pressure plate.

Note: Hook each lever under the edge of the adjusting yoke whilealigning the clevis pin hole with the holes in the pressureplate lugs.

43. Install three washers (104) on the three shoulder screws (103). Insertthe shoulder screws through the levers and lever lugs.

Note: The clutch links (15), clutch levers (9), headed pins (14),washers (107) and washers (13) are not servicedseparately. Order new parts if necessary and install as apre-assembled unit.

Note: The head of the shoulder screw must be in the clockwiseside of the lug when viewing it from the top (sliding sleeve)side.

44. Install three washers (105) on the three shoulder screws and secureeach with a hex nut (106). The nuts are self-locking-type hex nuts. Tightensecurely.

45. Place the pre-assembled sliding sleeve (27) on the adjusting yoke,aligning the three lugs between the three pairs of lever links.

46. Insert the shoulder screws (108) through the links and sliding sleevelugs. Place three washers (109) on the three shoulder screws and secureeach with a hex nut (110). The nuts are self-locking-type hex nuts. Tightensecurely.

47. Install the hose fitting (18) in the collar trunnion, and attach the flexiblehose (19), hose fitting (20) and lubrication fitting (23).

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Center the clutch plates

48. Visually center the friction plates (6) on the clutch and align the teeth.Press down on the collar assembly to lock the plates in place. Ifnecessary, pull the adjustment lock pin to compress the lock pin spring,and rotate the adjusting yoke assembly until the plates are locked inposition when the collar is pressed down.

Note: This is an initial setting to hold the plates in place untilafter the pto is mounted on the engine, so it is imperativethat the teeth be exactly aligned and the plates are exactlycentered on the clutch. The driving ring may be used asan alignment fixture to align the teeth and center the platesrelative to the hub-and-backplate so they are perfectlyaligned when the pto is installed on the engine.

Wooden block

(use 3) to hold

driving ring in

position

Teeth

Perfectly

center the clutch in the drive ring.

(This gap is to be exactly equal

all the way around.)

Driving Ring

(1)

Bench

Figure 46. Align the Plate Stack

Proceed to Clutch Shaft and Housing Assembly. Six main bearingconfigurations are illustrated. Refer to the Twin Disc Power Take-OffReference Listing in the Description and Specifications section to determinewhich configuration is used in your PTO.

Skip to:Clutch Shaft and Housing Assembly - Bearing Housing Configuration AClutch Shaft and Housing Assembly - Bearing Housing Configuration BClutch Shaft and Housing Assembly - Bearing Housing Configuration CClutch Shaft and Housing Assembly - Bearing Housing Configuration DClutch Shaft and Housing Assembly - Bearing Housing Configuration EClutch Shaft and Housing Assembly - Bearing Housing Configuration F

128



Clutch Shaft and Housing Assembly - Bearing HousingConfiguration A


Hex Head

Capscrew

(35)

Washer

(36)

Retainer

Clip

(37)

Bearing

Retainer

(38)

Bearing

Cup

(39)

Bearing

Cone

(41)

Plug

(43)

Bearing

Cone

(40)

Bearing

Cup

(42)

Fitting

(57)

Housing

(44)

Figure 47. Illustration - Main Bearing Configuration A

Install main bearings on the clutch shaft

1. Clean the tapered bearing cones (40 & 41) and clutch shaft (33) withisopropyl solvent to remove any oil or grease residue.

Note: Do not use any oil or paraffin based solvents.

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2. Use an arbor press to install the two bearing cones on the clutch shaft.Install the cones, one from each end, with the back faces (wide section)butting against the shoulder on the clutch shaft. (See note belowregarding alternative installation method.)

Note: Special tools are not available from Twin Disc, Inc., butcan be fabricated in any capable machine shop.

Note: Use a piece of steel tubing approximately 5 cm. (2 inches)longer than the distance from the end of the shaft to theshoulder and just slightly larger in inside diameter thanthe bearing cone�s inside diameter. The tubing must notbe thick enough to contact the cage of the bearing duringinstallation.

Press Ram

Flat Plate (tool)

Press Tube

Output end of

Clutch Shaft (33)

Bearing Cone (41)

Note: I.D. of Press Tube is

slightly larger than the I.D.

of the bearing.

Note: Thickness of

Press Tube wall must

contact ONLY the

inner race of the

bearing.

Note: Bearing must

be pressed tight

against the shoulder.

Figure 48. Install bearing cones on the shaft

Note: An alternative method to install the bearing cones is toheat them in an oven at 135° C. (275° F.) for one hour andinstall them immediately on the clutch shaft. Let the bearingcone cool to room temperature after installation whilecontinuing to apply force as the bearing cools. This isnecessary to ensure that it remains properly seated.

Handle the heated parts with care. The heated parts are extremely HOT.

3. After the bearings return to room temperature, coat the bearing rollersand both bearing cups with a light film of clean No. 30 engine oil.

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Clutch housing

4. Set the clutch housing (44) on the bed of a press with the input end ofthe housing facing up.

Note: There should be sufficient clearance below the housingto allow for installation of the clutch shaft.

5. Install 2 lubrication fittings (57) if they were removed.

6. Use a round steel plate slightly smaller in diameter than the outerdiameter of the rear main bearing cup (42). Place the bearing cup onthe housing, back (wide section) face down. Be sure the plate does notpress against the bearing cup�s roller contact surface in the cup. Pressthe cup to the bottom of the bore.


Note: Installation TipA scrap bearing cup the same size as the one beinginstalled (42) may be used as an installation tool in additionto a flat plate.

Press bearing

cup to bottom of

the bore.

Press Ram

Flat Plate (tool)

Scrap Bearing Cup

used upside down

Housing (44)

New Bearing Cup (42)

Figure 49. Install the rear bearing cup (42)

Install the clutch shaft and bearings into the housing.

7. Carefully install shaft and bearings in the housing. The output end of theshaft must enter the housing first.

Note: DO NOT pre-grease the bearings prior to installation intothe housing.

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8. Install the front bearing cup (39) in the bore on top of the upper bearingcone. Press it tight against the cone.

9. Install the bearing retainer (38) in the housing. Thread the bearing retainertight against the bearing.

Note: The notches must be up.

(Preliminary setting) Measure and set bearing end play.

The only approved method for adjustment of tapered roller bearings inTwin Disc Power Take-Offs is by use of a dial indicator to read actualbearing end play. This preliminary setting is for assembly purposes only.Final bearing end play must be adjusted as described below in “(Finalsetting) Measure and set bearing end play.”

10. Tighten the bearing retainer until 6.8 Nm. (60 in.-lbs.) of torque is requiredto rotate the shaft.

Note: Do not overtighten! Damage may occur to the bearingsor bearing retainer.

Rotate the shaft several revolutions. This aligns and seats the bearingcones in the bearing cups and creates a �zero� clearance.

11. Note the position of any one of the notches in the bearing retainer relativeto the threaded hole for the retainer lock capscrew.

Bearing

Retainer

Notches

Figure 50. Bearing Retainer Notches

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For side-load applications:Back off the bearing retainer (38) to create a clearance between thebearing retainer and bearing cup. The notch closest to the threadedhole (aligned with or clockwise from the hole) is the first notch.

SP111, SPE111 Series: Back off 3 1/2 - 4 1/2 notchesSP211, SPE211 Series: Back off 3 3/4 - 4 3/4 notchesRFD111, RFD211 Series: Back off 2 - 3 notches

For in-line applications:Back off the bearing retainer (38) to create a clearance between thebearing retainer and bearing cup.

SP111, SPE111 Series: Back off 3 1/2 - 4 1/2 notchesSP211, SPE211 Series: Back off 4 3/4 - 5 3/4 notchesRFD111 Series: Back off 2 - 3 notchesRFD211 Series: Back off 3 - 4 notches

Note: SP111, SPE111 and RFD111 Series use the same settingfor both side-load and in-line operation.

Note: Bump the output end of the shaft with a soft mallet hardenough to move and seat the front bearing cup up againstthe bearing retainer and create the specified bearingclearance after each adjustment of the bearing retainer.

Only a preliminary adjustment procedure has been completed bybacking off the bearing retainer. The only approved method foradjustment of tapered roller bearings in Twin Disc Power Take-Offs isby use of a dial indicator to read actual bearing end play. Continue to(Final Setting) Measure and set bearing end play to complete theadjustment procedure.

(Final setting) Measure and set bearing end play

12. Securely support the unit with the clutch shaft in a vertical position andthe output end up. Be sure the shaft is clear to rotate.

13. Attach an eyebolt in the thread at the output end of the shaft. Attach ahoist with a thrust bearing-equipped swivel hook to the eyebolt.

14. Securely attach a dial indicator to the housing and locate the stem sothe tip is contacting the end of the shaft and movement of the tip isexactly vertical, the same direction as the movement of the shaft.

133



15. Lift the unit off the supports using the hoist. Apply approximately 90.7Kg. (200 lbs.) of downward force on the bearing carrier while dialindicator is being set. Mark a spot on the end of the shaft next to thestem as a starting reference point and set the dial indicator to �zero.�

Use a Hoist

and swivel

hook.

Dial indicator

Bearing

Retainer

Note: Typical housing

configuration is

illustrated. Your

housing may be

designed differently.

Bearing

Retainer Lock

Figure 51. Measuring and setting bearing end play

16. Carefully and gently lower the unit back onto the supports. Allow thehoist to go slack. Apply approximately 90.7 Kg. (200 lbs.) of downwardforce on the shaft while dial indicator reading is being taken. (The weightof the shaft will be considered part of the 90.7 Kg. (200 lbs.) Read thedial indicator to read actual bearing end play.

17. Repeat steps 15 and 16 to be sure the dial indicator reading repeatswith accuracy. Adjust the bearing retainer as necessary to obtain 0.101- 0.178 mm. (0.004 - 0.007 in.) bearing end play. (See note below.)

Note: SP211, SPE211 and RFD211 only: For in-line operation:Adjust the bearing retainer as necessary to obtain 0.178- 0.229 mm. (0.007 - 0.009 in.) bearing end play.

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.18. Once the bearing end play adjustment is completed, match-mark the

bearing retainer and bearing housing so the bearing retainer may beremoved and reinstalled in the same exact position.

19. After match-marking the bearing retainer and bearing housing, removethe bearing retainer (35) and front bearing cup (39).

20. Remove the shaft and hand-pack the bearing cones (40 & 42) withgrease specified in the Lubrication specifications in the Maintenancesection. See information regarding Filling the Main Bearing Cavityat initial assembly in the Description and Secifications section of thismanual.

Note: Do not pack the bearing carrier cavity with grease. Theproper amount of grease will be added later.

21. Reinstall the shaft with bearings, front bearing cup and bearing retainer.Position the bearing retainer exactly as it was prior to removal. Realignthe match-marks.

22. Install the retainer clip (37), hex head capscrew (35) and washer (36).Torque the capscrews to the proper specifications given in TorqueValues for Fasteners in the Description and Specifications section.

Note: Bump the output end of the shaft with a soft mallet (asdescribed in the previous step above) hard enough tomove and seat the front bearing cup up against the bearingretainer and create the specified bearing clearance aftereach adjustment of the bearing retainer.

(Proceed to Install the Operating Shaft and Throwout Yoke)

135



Clutch Shaft and Housing Assembly - Bearing HousingConfiguration B


Hex Head

Capscrew

(35)

Front Bearing

Retainer

(38)

Bearing

Cone

(40)

Bearing

Cup

(39)Bearing Cone

(41)

Bearing Cup

(42)

Internal Bearing

Spacer

(58)

Washer

(60)

Hex Head

Capscrew

(65)

Seal Plate

(64)

Nut

(62)

External Bearing

Spacer

(59)

Washer

(61)

Housing

(44)

Figure 52. Illustration - Main Bearing Configuration B

Install main bearings on the clutch shaft

1. Clean the tapered bearing cones (40 & 41) and clutch shaft with isopropylsolvent to remove any oil or grease residue.


2. Use an arbor press to install the front bearing cone (40) on the clutchshaft. Install the cone from the output end, with the back face (wide section)butting against the shoulder on the clutch shaft. (See note belowregarding alternative installation method. )


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Note: Use a piece of steel tubing approximately 5 cm. (2 inches)longer than the distance from the end of the shaft to theshoulder and just slightly larger in inside diameter thanthe bearing cone�s inside diameter. The tubing must notbe thick enough to contact the cage of the bearing duringinstallation.

Press Ram

Flat Plate (tool)

Press Tube

Output end of

Clutch Shaft (33)

Bearing Cone (40)



of the bearing.

Note: Thickness of


contact ONLY the

inner race of the

bearing.

Note: Bearing must

be pressed tight



Note: An alternative method to install the bearing cone is to heatit in an oven at 135° C. (275° F.) for one hour and installthem immediately on the clutch shaft. Let the bearing conecool to room temperature after installation while continuingto apply force as the bearing cools. This is necessary toensure that it remains properly seated.


3. After the bearing returns to room temperature, coat the bearing rollerswith a light film of clean No. 30 engine oil.

137



Clutch housing

4. Set the clutch housing (44) on the bed of a press with the input end ofthe housing facing up.

5. Install 2 plugs (57) if they were removed.

6. Use a round steel plate slightly smaller in diameter than the outerdiameter of the front main bearing cup (39). Place the bearing cup onthe housing, back (wide section) face down. Be sure the plate does notpress against the bearing cup�s roller contact surface in the cup. Pressthe cup to the bottom of the bore.



Press bearing

cup to bottom of

the bore.

Press Ram

Flat Plate (tool)

Scrap Bearing Cup

used upside down

Housing (44)


Figure 54. Install the front bearing cup (39)

138



Install the clutch shaft and bearing into the housing.

7. Carefully install the clutch shaft and bearing in the housing. The outputend of the shaft must enter the housing first.

Note: Pre-grease the bearings prior to installation into thehousing.

8. Install the (front) bearing retainer (38) on top of the upper bearing cone.Press it tight against the cone and secure it with six hex head capscrews(35). Torque the capscrews to the proper specifications given in TorqueValues for Fasteners in the Description and Specifications section.

9. Carefully turn the housing over on the bench. Install the external spacer(59) in the housing, resting against the front bearing cup.

10. Install the internal spacer (58) in the housing, resting against the frontbearing cone.

11. Install the rear bearing cup (42) with the wide side down against theinternal and external spacers.

12. Install the rear bearing cone, seated securely in the bearing cup.

13. Install the (thick) washer (60), resting against the rear bearing cone.

14. Install the (thin) washer (61) on top of the thick washer.

15. Install the nut (62). Thread it tight against the washer and torque the nutto 655 - 790 Nm (483 - 583 lb. ft.).

Use extreme caution to avoid damaging shaft while holding it secure toallow obtaining proper torque on the nut.

16. Install the seal plate (64) and secure with three capscrews (65). Torquethe capscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.


139



Clutch Shaft and Housing Assembly - Bearing HousingConfiguration C


Oil

Slinger

(66)

Front

Wear

Sleeve

(67)

Bearing

Carrier

(47)

Hex Head

Capscrew

(48)

O-Ring

Seal

(50)

Rear

Seal

(70)

Wear

Sleeve

(69)

Pipe

Plug

(52)

Filler/

Breather

(72)

Drain

Plug

(71)

Front

Oil

Seal

(68)

Bearing

Retainer

(38)

Hex Head

Capscrew

(35)

Lock

Plate

(36)

Bearing Cup

(42)

Bearing

Cone

(40)

Bearing Cup

(39)

Bearing

Cone

(41)

Shims

(63)

Housing

(44)

Fitting

(57)

Figure 55. Illustration - Main Bearing Configuration C

Clutch Shaft

1. Clean the tapered bearing cones (40 & 41) and clutch shaft (33) withisopropyl solvent to remove any oil or grease residue.


140



2. Use an arbor press to install the two bearing cones on the clutch shaft.Install the cones, one from each end, with the back faces (wide section)butting against the shoulder on the clutch shaft. Use a piece of steeltubing approximately 5 cm. (2 inches) longer than the distance from theend of the shaft to the shoulder and just slightly larger in inside diameterthan the bearing cone�s inside diameter. The tubing must not be thickenough to contact the cage of the bearing during installation.

Press Ram

Flat Plate (tool)

Press Tube

Output end of

Clutch Shaft (33)

Bearing Cone (41)



of the bearing.

Note: Thickness of


contact ONLY the

inner race of the

bearing.

Note: Bearing must

be pressed tight



Note: An alternative method to install the bearing cones is toheat them in an oven at 135° C. (275° F.) for one hour andinstall them immediately on the clutch shaft. Let the bearingcones cool to room temperature after installation. Continueto apply force as the bearing cools to room temperatureensuring that it remains seated.


141



3. Coat the I.D. of the rear wear sleeve (69) with an anaerobic sealantTwin Disc part number M2828. Press the sleeve onto the shaft. The flatend of the sleeve should be nearest the rear bearing cone. Whenpositioned properly, the contoured side will align exactly with the shoulderof the shaft. Be sure the contour blends in with the shoulder of the clutchshaft. Remove excess sealant when sleeve is in its proper position onthe shaft.

Shaft shoulderShaft wear sleeve shoulder

Contour is flush.

Wear sleeve

Figure 57. Locating the oil seal wear sleeve on the shaft

Note: The front wear sleeve (67) will be installed on the shaftlater in the assembly procedure. It will be installed afterfinal bearing end play is set and the oil slinger is theninstalled.

Clutch housing

4. Set the clutch housing (44) on the bed of a press with the input end ofthe housing facing down.

5. Install 2 lubrication fittings (57) if they were removed.

6. Rest the front oil seal (68) in the housing bore; the seal lip should be up,extending toward the bearing carrier. Use a flat steel plate slightly largerin diameter than the O.D. of the oil seal. Press the seal straight into thebore until the steel plate stops against the surface of the housing. Thetop end of the outer shell of the seal should be flush with the surface ofthe housing. Pre-lubricate the seal lip with clean No. 30 engine oil.

Note: Press only on the outer shell of the seal. Do not damagethe seal lip.

7. Set the clutch housing on a work bench, securely supported with woodenblocks, with the input end of the housing facing down. There should besufficient clearance below the housing to allow for installation of the clutchshaft.

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Bearing Carrier

8. Position the bearing carrier (47) on the bed of an arbor press with theinput end down.

9. Rest the rear oil seal (70) in the bore; the seal lip should be down,extending toward the input end of the bearing carrier. Use a flat steelplate slightly larger in diameter than the O.D. of the oil seal. Press theseal straight into the bore until the steel plate stops against the surfaceof the carrier. The rear of the outer shell of the seal should be flush withthe surface. Pre-lubricate the seal lip with clean No. 30 engine oil.


10. Invert the bearing carrier (47) on the bench so the input end is up. Use apiece of steel tubing or round plate slightly smaller in diameter than theouter diameter of the rear main bearing cup. Place the bearing cup (42)on the carrier, back face down. Be sure the steel tubing or plate doesnot press against the bearing contact surface in the cup. Press the cupto the bottom of the bore.

Press bearing

cup to bottom of

the bore.

Press Ram

Flat Plate (tool)

Scrap Bearing Cup

used upside down

Bearing Carrier (47)



11. Pre-lubricate the wear sleeve surface with clean No. 30 engine oil inpreparation for installation of the shaft into the bearing retainer.

12. Coat the bearing rollers and both bearing cups with a light film of cleanNo. 30 engine oil.

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Install the clutch shaft and bearing cones into the bearing carrier.

13. Place the bearing carrier (47) in a large bench vise with protective jawsor securely support it on a bench with the input end up. There must besufficient clearance below the carrier to install the shaft. Carefully installshaft and bearings in the bearing carrier. Be careful to not damage theseal lip as the shaft is installed through it.

14. Install the forward bearing cup (39) into the bearing carrier.

15. Install the bearing retainer (38) over the clutch shaft, resting against thebearing cup.

(Preliminary setting) Measure and set bearing end play

16. Use 3 of the 6 hex head capscrews (35) and pull the retainer downevenly until 6.8 Nm. (60 in.-lbs.) of torque is required to rotate the shaft.


Rotate the shaft several revolutions. This aligns and seats the bearingcones in the bearing cups and creates a “zero” clearance.

17. Measure the shim gap between the bearing retainer and the bearingcarrier with a feeler gage. Add a thickness of shims equal to the gapplus 0.102 - 0.178 mm. (0.004 - 0.007 in.).

Note: For in-line operation, add a thickness of shims equal tothe gap plus 0.178 - 0.229 mm. (0.007 - 0.009 in.).

18. Remove the three hex head capscrews and the bearing retainer. Installthe selected shim pack (63) and reinstall the retainer, 6 hex headcapscrews (35) and three lock plates (36). Torque the capscrews to theproper specifications given in Torque Values for Fasteners in theDescription and Specifications section.

Note: Bump the output end of the shaft with a soft mallet hardenough to move and seat the front bearing cup up againstthe bearing retainer and create the specified bearingclearance.

Only a preliminary adjustment procedure has been completed by theprevious operations. Continue to (Final Setting) Measure and set bearingend play to complete the adjustment procedure.

144





Use a Hoist

and swivel

hook.

Dial indicator

Shims

Bearing

Retainer


configuration is

illustrated. Your

housing may be



20. Attach an eyebolt in the 1/4” PTF thread at the output end of the shaft.Attach a hoist with a thrust-bearing-equipped swivel hook to the eyebolt.


22. Lift the unit off the supports using the hoist. Apply approximately 90.7Kg. (200 lbs.) of downward force on the bearing carrier while dialindicator is being set. Mark a spot on the end of the shaft next to thestem as a starting reference point and set the dial indicator to zero.

145



23. Carefully and gently lower the unit back onto the supports. Allow thehoist to go slack. Apply approximately 90.7 Kg. (200 lbs.) of downwardforce on the shaft while dial indicator reading is being taken. (The weightof the shaft will be considered part of the 90.7 Kg. (200 lbs.)) Read thedial indicator to read actual bearing end play.

24. Repeat steps 22 and 23 to be sure the dial indicator reading repeatswith accuracy. Remove the capscrews (35), washers (36), bearingretainer (38) and shims (63), if necessary, to add or subtract shims toobtain the specified bearing end play. When the correct bearing endplay has been set and verified, reinstall the components. Torque thecapscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.

25. Bend the tabs of the lock plates (36) so they are against the flats of thehex head capscrews.

Note: Bump the output end of the shaft with a soft mallet hardenough to move and seat the front bearing cup up againstthe bearing retainer and create the specified bearingclearance after each adjustment of the bearing retainer.

Install the oil slinger

26. Invert the shaft unit and support it with the output end resting securely ona solid surface so the press force is carried through the shaft, not againstthe roller bearings, when the oil slinger (66) and front wear sleeve (67)are installed.

27. Carefully measure the length of the front wear sleeve and mark the shaftat a point below the shoulder equal to that measurement; that is, justabove the bearing retainer. Press the oil slinger (66) on the shaft. Theflat side will be down toward the bearing retainer, located exactly at themarked location. The lip extension at the I.D. will be up, toward theshoulder.

Oil Slinger

(66)

Clutch Shaft

(33)

Mark position on shaft and

locate Oil Slinger at the mark.

Figure 60. Mark position of Oil Slinger

146



28. Coat the I.D. of the front wear sleeve (67) with an anaerobic sealantTwin Disc part number M2828. Press the sleeve onto the shaft. The flatend of the sleeve should be tight against the oil slinger. When positionedproperly, the contoured side will align exactly with the shoulder of theshaft. Be sure the contour blends in with the shoulder of the clutch shaft.Remove excess sealant when sleeve is in its proper position on theshaft.

Wear Sleeve

(67)

Oil Slinger

(66)

Clutch Shaft

(33)

Figure 61. Proper position of Wear Sleeve and Oil Slinger

Shaft shoulderShaft wear sleeve shoulder

Contour is flush.

Wear sleeve

Figure 62. Locating the oil seal wear sleeve on the shaft

Check to be sure the oil slinger is not in contact with the clutchhousing.

29. Lift the bearing carrier and shaft using a hoist securely attached to it.Carefully place the bearing carrier and shaft onto the clutch housing(34). Disconnect the hoist.

Note: Do not install the rubber seal (50) at this time.

30. Align the bearing carrier (47) so the breather (72) will be at the top whenthe pto is installed on the engine, aligned with the instruction cover platehole.

147



31. Install two hex head bolts (48), located 180o apart, and tighten the bearingcarrier to the clutch housing.

32. Slowly rotate the shaft. Carefully listen and feel for contact between theoil slinger and the clutch housing. The oil slinger MUST NOT contact thehousing. If it does, remove the bearing carrier and shaft and repeatstep 27 by moving the oil slinger a little closer to the bearing retainer.Then repeat this step as necessary to insure no contact exists.

Install the shaft and bearing carrier in the main housing.

33. Again remove the bearing carrier. Place the rubber seal (50) on thepilot of the bearing carrier.

34. Lift the bearing carrier and shaft using a hoist securely attached to it.Carefully place the bearing carrier and shaft onto the clutch housing(44). Disconnect the hoist.

Use extreme care to prevent damage to the oil seal as the shaft passesthrough it. If the seal lip is damaged, replace the seal before proceeding(see step 6).

Complete the assembly of the bearing carrier and shaft unit.

35. Install the drain plug (71) and breather (72) in the bearing carrier.

36. (Later production units) Install the oil gauge tube (73) into the bearingcarrier if it was removed. The tube must fit tight enough in the hole so asto require over 133 N. (30 lbs.) to remove it. The tube must seal in thehole so an oil leak does not occur.

37. Place the support plate in position (if used), and secure the bearingcarrier and support plate to the clutch housing with eight hex-headcapscrews (48). Torque the capscrews to the proper specificationsgiven in Torque Values for Fasteners in the Description andSpecifications section.

148



38. Install two flush pipe plugs (52) at the rear of the carrier. Torque thecapscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.



149



Clutch Shaft and Housing Assembly - Bearing HousingConfigurations D, E & F


Ball

Bearing

(40)

Bearing

Retainer

(38)

Bearing

Carrier

(47)

Hex Head

Capscrew

(48)

Internal

Snap Ring

(75)

Ball

Bearing

(41)

Washer

(49)

Fitting

(57)

Housing

(44)

Figure 63. Illustration - Main Bearing Configuration D

Bearing

Cup

(39)

Bearing

Retainer

(38)

Bearing

Carrier

(47)

Hex Head Capscrew (48)

& Washer (49)

Retainer

Clip

(37)

Hex Head

Capscrew

(35)

Washer

(36)

Bearing

Cone

(41)

Plug

(52)

Fitting

(57)

Bearing

Cup

(42)

Bearing

Cone

(40)

Housing

(44)

Figure 64. Illustration - Main Bearing Configuration E

150



Bearing

Cup

(42)

Bearing

Retainer

(38)

Bearing

Carrier

(47)

Hex Head

Capscrew

(48)

Hex Head

Capscrew

(35)

Washer

(36)

Bearing

Cone

(41)

Front

Oil Seal

(68)

Shims

(63)

O-Ring Seal

(78)

Washer

(49)

Rear Oil

Seal

(70)

Fitting

(32)

Bearing

Cup

(39)

Bearing

Cone

(40)

Fitting

(57)

Plug

(52)

Housing

(44)

Figure 65. Illustration - Main Bearing Configuration F

Clutch shaft

1. Clean the tapered bearing cones (40 & 41, or bearings 40 & 41) andclutch shaft (33) with isopropyl solvent to remove any oil or greaseresidue.


151



Configuration D only: (Configurations E & F skip to step 7.)

2. Use an arbor press to install the two bearings (40 & 41) on the clutchshaft (33). Install the bearings, one from each end, tight against theshoulder on the clutch shaft. Use a piece of steel tubing approximately 5cm. (2 in.) longer than the distance from the end of the shaft to the shoulderand just slightly larger in inside diameter than the bearing�s insidediameter. (See note below regarding special tools.) The tubing mustnot be thick enough to contact the cage or balls of the bearing duringinstallation.


Press Ram

Flat Plate (tool)

Press Tube

Output end of

Clutch Shaft (33)

Bearing (41)



of the bearing.

Note: Thickness of


contact ONLY the

inner race of the

bearing.

Note: Bearing must

be pressed tight


Figure 66. Install bearings on the shaft

Note: An alternative method to install the bearings is to heatthem in an oven at 135° C. (275° F.) for one hour andinstall them immediately on the clutch shaft. Let the bearingcone cool to room temperature after installation whilecontinuing to apply force as the bearing cools. This isnecessary to ensure that it remains properly seated.


152



Install the clutch shaft and bearings into the bearing carrier.

3. Place the bearing carrier (47) in a large bench vise with protective jawsor securely support it on a bench with the input end up. There must besufficient clearance below the carrier to install the shaft.

Note: Pre-grease the bearing prior to assembly.

4. Carefully install shaft and bearings in the bearing carrier. The output endof the shaft must enter the carrier first.

5. Install the bearing retainer (38) in the bearing carrier. Press the bearingretainer tight against the bearing.

Note: The raised side with the internal labyrinth seal groovesmust be away from the bearing, against the internal snapring (75).

This side away

from bearing

This side toward

bearing

Figure 67. Bearing Retainer

6. Install internal snap ring (75) in the groove in the bearing carrier,contacting against the bearing retainer. (Proceed to step 33.)

153



Configurations E & F only

7. Use an arbor press to install the two bearing cones (40 & 41) on theclutch shaft (33). Install the cones, one from each end of the shaft, withthe back faces (wide section) butting tightly against the shoulder on theclutch shaft. Use a piece of steel tubing approximately 5 cm. (2 in.) longerthan the distance from the end of the shaft to the shoulder and just slightlylarger in inside diameter than the bearing cone�s inside diameter. (Seenote below regarding special tools.) The tubing must not be thick enoughto contact the cage or balls of the bearing during installation.


Press Ram

Flat Plate (tool)

Press Tube

Output end of

Clutch Shaft (33)

Bearing Cone (41)



of the bearing.

Note: Thickness of


contact ONLY the

inner race of the

bearing.

Note: Bearing must

be pressed tight


Figure 68. Install Bearing Cones on the Shaft

Note: An alternative method to install the bearing cones is toheat them in an oven at 135° C. (275° F.) for one hour andinstall them immediately on the clutch shaft. Let the bearingcones cool to room temperature after installation whilecontinuing to apply force as the bearing cools. This isnecessary to ensure that it remains properly seated.


154



8. After the bearings return to room temperature, coat the bearing rollersand both bearing cups with a light film of clean No. 30 engine oil.

Install the clutch shaft and bearings into the bearing carrier.

Configuration F only: (Configuration E skip to step 10.)

9. Position the bearing carrier with the output end up. Rest the rear oil seal(70) in the bearing carrier bore; the seal lip should be down, extendingtoward the front end of the bearing carrier. Use a flat steel plate slightlylarger in diameter than the O.D. of the oil seal. Press the seal straightinto the bore until the steel plate stops against the surface of the bearingcarrier. The top end of the outer shell of the seal should be flush with thesurface. Pre-lubricate the seal lip with clean No. 30 engine oil.


155



Configurations E & F :

10. Use a round steel plate slightly smaller in diameter than the outerdiameter of the rear main bearing cup (42). Place the bearing cup onthe housing, back (wide section) face down. Press the cup to the bottomof the bore. Be sure the plate does not press against the bearing cup�sroller contact surface in the cup.



Press bearing

cup to bottom of

the bore.

Press Ram

Flat Plate (tool)

Scrap Bearing Cup

used upside down

Bearing Carrier (47)



11. Carefully install shaft and bearings in the bearing carrier. The output endof the shaft must enter the carrier first.

12. Install the front bearing cup (39) in the bearing carrier bore, securelypositioned against the bearing cone.

Configuration E only: (Configuration F skip to step 16)

13. Install the bearing retainer (38) in the housing. Thread the bearing retainertight against the bearing.

Note: The notches must be up.

156




The only approved method for adjustment of tapered roller bearings inTwin Disc Power Take-Offs is by use of a dial indicator to read actualbearing end play. This preliminary setting is for assembly purposes only.Final bearing end play must be adjusted as described below in “(Finalsetting) Measure and set bearing end play.”

14. Tighten the bearing retainer until 6.8 Nm. (60 in.-lbs.) of torque is requiredto rotate the shaft.


Rotate the shaft several revolutions. This aligns and seats the bearingcones in the bearing cups and creates a �zero� clearance.

15. Note the position of any one of the notches in the bearing retainer relativeto the threaded hole for the retainer lock capscrew. Back off the bearingretainer (38) four notches to create a clearance between the bearingretainer and bearing cup. The notch closest to the threaded hole (alignedwith or clockwise from the hole) is the first notch.

Note: For in-line operation, back off the bearing retainer (38)five notches.

Bearing

Retainer

Notches

Figure 70. Bearing Retainer Notches

Note: Bump the output end of the shaft with a soft mallet hardenough to move and seat the front bearing cup up againstthe bearing retainer and create the specified bearingclearance after each adjustment of the bearing retainer.(Proceed at step 22.)

157



Configuration F only:


The only approved method for adjustment of tapered roller bearings inTwin Disc Power Take-Offs is by use of a dial indicator to read actualbearing end play. The preliminary setting is for assembly purposes only.Final bearing end play must be adjusted as described below in “(Finalsetting) Measure and set bearing end play.”

16. Measure the distance from the top surface of the bearing retainer to thetop surface of the bearing cup. Record this measurement. This is A.

A Top Surface

Bearing

Cup

Figure 71. Measuring for Shims - Dimension A

17. Measure the distance from the flange of the bearing retainer (38) to thesurface opposite the oil seal bore. Record this measurement. This is B.

B

Surface Opposite

Seal Bore

Seal Bore

Figure 72. Measuring for Shims - Dimension B

158



18. Calculate a preliminary shim stack. Subtract measurement B frommeasurement A. The difference between the two measurements is C.

Select a shim stack that is 0.15 mm. (0.006 in) less than difference C.

19. Install the selected shim stack on top of the bearing cone (39).

20. Install the bearing retainer (38) in the housing bore, tight against theshim stack.

Note: The oil seal bore must be up. (See previous illustration.)Do not install the seal (68) in the bore at this time. It will beinstalled later.

21. Install three hex head capscrews (35) with washers (36). Torque thecapscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.


Configurations E & F:



23. Attach an eyebolt in the thread at the output end of the shaft. Attach ahoist with a thrust bearing-equipped swivel hook to the eyebolt.


159



25. Lift the unit off the supports using the hoist. Apply approximately 90.7Kg. (200 lbs.) of downward force on the bearing carrier while dialindicator is being set. Mark a spot on the end of the shaft next to thestem as a starting reference point and set the dial indicator to �zero.�

Use a Hoist

and swivel

hook.

Dial indicator

Bearing

Retainer

Lock

Bearing

Retainer


configuration is

illustrated. Your

housing may be



26. Carefully and gently lower the unit back onto the supports. Allow thehoist to go slack. Apply approximately 90.7 Kg. (200 lbs.) of downwardforce on the shaft while dial indicator reading is being taken. (The weightof the shaft will be considered part of the 90.7 Kg. (200 lbs.) Read thedial indicator to read actual bearing end play.

160



27. Repeat steps 25 and 26 to be sure the dial indicator reading repeatswith accuracy. Adjust the bearing retainer (or remove the bearing retainerand add or subtract shims) as necessary to obtain the proper bearingend play as shown in Tapered Roller Bearing End Play in theDescription and Specifications section. (See note below.)

Note: For in-line operation: Adjust the bearing retainer (orremove the bearing retainer and add or subtract shims)as necessary to obtain the proper bearing end play asshown in Tapered Roller Bearing End Play in theDescription and Specifications section.

Configuration E only: (Configuration F skip to step 33)

28. Once the bearing end play adjustment is completed, match-mark thebearing retainer and bearing housing so the bearing retainer may beremoved and reinstalled in the same exact position.

29. After match-marking the bearing retainer and bearing housing, removethe bearing retainer (36) and front bearing cup (39).

30. Remove the shaft and hand-pack the bearing cones (40 & 41) withgrease specified in the lubrication specifications in the Maintenancesection. See information regarding Filling the main bearing cavityat initial assembly in the Description and Operation section of thismanual.

Note: Do not pack the bearing carrier cavity with grease. Theproper amount of grease will be added later.

31. Reinstall the shaft with bearings, front bearing cup and bearing retainer.Position the bearing retainer exactly as it was prior to removal. Realignthe match-marks.

32. Install the retainer clip (37), hex head capscrew (35) and washer (36).Torque the capscrews to the proper specifications given in TorqueValues for Fasteners in the Description and Specifications section.


161



Install the bearing carrier unit on the clutch housing.

Configurations D, E & F:

33. Set the clutch housing (44) on a work bench, securely supported withwooden blocks, with the input end of the housing facing down. Thereshould be sufficient clearance below the housing to allow for installationof the clutch shaft.

34. Lift the bearing carrier and shaft using a hoist securely attached to it.Carefully lower the bearing carrier and shaft onto the clutch housing.Disconnect the hoist. Position the carrier so the grease fitting (51) (orbreather (32) if Configuration F) will be up when the clutch housing is inits final position on the engine.

35. Attach the support plate and secure the bearing carrier to the clutchhousing with six hex-head capscrews (48) and washers (49). Torquethe capscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.

36. Install plugs (52) in the bearing retainer holes.


162



Install the Operating Shaft and Throwout Yoke.

SPE111 and SPE211 Series only: (SP111, SP211, SP311, RFD111 andRFD211 Series, skip to step 2.)

1. Install the two Camrols (92) into the throwout yoke (54). Position theCamrols toward the inside of the yoke and the nuts (93) on the outside.Install a hex nut on each Camrol and torque the nuts to 17-21 Nm (13-16lb.-ft.).

SP111, SPE111, SP211, SPE211, SP311, RFD111 and RFD211 Series2. Position the clutch housing on a bench with the input end facing up.

Install the operating shaft (55) halfway into the clutch housing. Slip thethrowout fork (54) onto the operating shaft and push the shaft through tothe hole on the other side of the clutch housing far enough to exposeone of the woodruff key slots at the center of the throwout fork.

3. Install one woodruff key (56) in the operating shaft.

Clutch Shaft (33)

Bearing

Carrier (47)

Note position

of throwout fork

(54)

O p e r a t i n g

Shaft (55)

Figure 74. Install the throwout fork

4. Push the operating shaft the other way to expose the other key slot inthe center of the fork.

5. Install the other woodruff key (56).

6. Center the operating fork so the hex head capscrews will enter thebottom of the throwout fork and thread into the top section. Install the twohex-head capscrews and tighten. Torque the capscrews to the properspecifications given in Torque Values for Fasteners in the Descriptionand Specifications section.

(Proceed to PTO Final Assembly)

163



PTO Final Assembly


Install the clutch in the clutch housing.

1. Set up and support the main housing assembly (44) with attached partson the bench with the input side facing up.

Note: The output end of the shaft must rest securely on a solidsurface.

2. Carefully place the clutch assembly over the clutch shaft while:

A. Aligning the trunnions on the collar with the throwout fork.

B. Aligning the keyways in the hub-and-back plate with the keywayin the clutch shaft.

Note: BOMs such as SP111C016 and SP211C022 only:Carefully insure that the three plungers are properlypositioned as the clutch is put on the shaft, and that theyare not damaged.

Rotate

throwout fork

to engage

trunnion.

Clutch Shaft (33)

Clutch Key (29)Clutch

Output end of the

shaft MUST rest and

be in contact with a

solid support (Press

bed).

Use several 4” x 4”

blocks or other

means of insuring

the pto does not tip

or fall over.

1234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234

123123123123123123123123123123123123123123123123123123123123123123123123123123123123123123123123123123

Figure 75. Assemble clutch into Power Take-Off

164



3. Partially install the hub key (29) in the keyway. Tap the hub-and-backplate with a large, but soft mallet, to seat it on the tapered surface of theclutch shaft.

Be sure the output end of the shaft is resting on a solid surface to absorbthe force through the shaft rather than through the bearing surfaces.

4. Drive the hub key (29) into position slightly below the surface of the hub-and-back plate (4).

Note: Do not use excessive hammer force when installing thekey.

5. Install the hub nut lock washer (3) over the clutch shaft (33), locating itstab in the drilled hole on the hub-and-back plate (4). Install the hub nut(2) and tighten and torque to 40.7 Nm. (30 ft. -lb).

6. Tighten the hub nut an additional 150 - 180 degrees clockwise, thenbend a side of the hub nut lock washer up against a flat on the hub nut.

7. Route the flexible hose assembly (19) clear of all moving parts and pushthe end hose fitting (20) through the hole in the clutch housing.

8. Install the lock washer (21) and jam nut (22) to retain the end fitting (23)in the housing. Torque the capscrews to the proper specifications givenin Torque Values for Fasteners in the Description and Specificationssection.

Confirm that the hose assembly is not twisted or applying preload tothe collar assembly.

9. Install all remaining plugs and external components on the power take-off.

Configuration F only:10. Install the oil level gauge (74).

165



Center the clutch plates

11. If not previously done, visually center the friction plates (6) on the clutchand align the teeth. Press down on the collar assembly to lock the platesin place. If necessary, pull the adjustment lock pin to compress the lockpin spring, and rotate the adjusting yoke assembly until the plates arelocked in position when the collar is pressed down.

Note: This is an initial setting to hold the plates in place untilafter the pto is mounted on the engine, so it is imperativethat the teeth be exactly aligned and the plates are exactlycentered on the clutch. The driving ring may be used asan alignment fixture to align the teeth and center the platesrelative to the hub-and-backplate so they are perfectlyaligned when the pto is installed on the engine.

Perfectly

center the clutch in the drive ring.

(This gap is to be exactly equal

all the way around.)

Visually align

Driving Ring

relative to housing

bore.

Figure 76. Using the driving ring as an alignment tool

166



Final assembly and lubrication.

12. Install the power take-off according to instructions in the Installationsection of this manual.

13. Adjust the clutch according to Clutch Adjustment in the Maintenancesection of this manual.

14. Fill the main bearing cavity with grease or oil according to Filling theMain Bearing Cavity during initial assembly in the Description andSpecifications section and Lubrication specifications in theMaintenance section of this manual.

15. Lubricate the remainder of the pto according to lubricationspecifications in the Description and Specifications section of thismanual.

16. Place the instruction cover plate (45) in position on the housing andsecure with 2 hex-head cap screws 5/16� - 18 x 1/2� (46). Torque thecapscrews to the proper specifications given in Torque Values forFasteners in the Description and Specifications section.

17. Install the shaft key (34) and all parts previously removed from the outputend of the clutch shaft.

167

Twin Disc, Incorporated Illustrations


Illustrations

List of Illustrations

The following pages include illustrations that are specific to thse models. Theillustrations included are listed below.

Note: Any part numbers listed in the following illustrations arefor reference only. Please refer to your bill of material forpart numbers specific to your model.

Parts Identification List - SP111, SPE111, SP211, SPE211, SP311,RFD111 and RFD211 Series

Exploded View (SPE111 and SPE211 Series Clutches)

Exploded View (SP111C016 and SP211C022 Clutches)

Exploded View (Bearing Housing Configuration A)

Exploded View (Bearing Housing Configuration B)

Exploded View (Bearing Housing Configuration C)

Exploded View (Bearing Housing Configuration D)

Exploded View (Bearing Housing Configuration E)

Exploded View (Bearing Housing Configuration F)

Exploded View (SPE111 and SPE211 Series Throwout Mechanism)

168

Twin Disc, IncorporatedIllustrations



1 Pilot Bearing 1

2 Nut 1

3 Washer 1

4 Hub-and-back plate 1

5 Ring, drive 1

6 Plate, friction 1,2 or 3

7 Plate, center 1 or 2

8 Plate, pressure 1

9 Lever 3

10 Washer (lever to pressure plate) 3

11 Pin, clevis (lever to pressure plate) 3

12 Pin, cotter (lever to pressure plate) 3

13 Cotter pin (or washer) (lever to link) 3

14 Pin, clevis (lever to link) 3

15 Link 3

16 Pin, clevis (link to sleeve) 3

17 Clevis pin (link to sleeve) 3

18 Fitting 1

19 Hose 1

20 Fitting 1

21 Washer 1

22 Nut 1

23 Fitting, grease 1

24 Spring, compression 1

25 Pin 1

26 Yoke, adjusting 1

27 Sleeve, sliding 1

28 Collar assembly (collar) 1

29 Ring, snap-external 1

30 Bearing, ball 1

31 Ring, snap-internal 1

32 Key-clutch 1

33 Shaft, clutch 1

34 Key-output 1

35 Capscrew, hex-head 1 or 6

36 Washer 1 or 6

37 Retainer, clip 1

38 Retainer, bearing 1

39 Bearing, cup-front 2

40 Bearing, cone-front (or bearing-qty. 1) 2

41 Bearing, cone-rear (or bearing-qty. 1) 2

42 Bearing, cup-rear 2

43 pipe plug or ball 1

44 Housing 1

45 Plate, instruction 1

46 Screw, machine 2

47 Carrier, bearing 1

48 Screw, hex-head 6

49 Washer 6

50 Seal 1

51 Fitting 1

52 Plug 2 or 3

53 Hand lever assembly 1

54 Throwout yoke 1

55 Shaft, operating 1

56 Key, woodruff 2

Item Description Qty. Item Description Qty.

169




Item Description Qty. Item Description Qty.

57 Fitting (or plug) 2

58 Spacer, internal 1

59 Spacer, external 1

60 Washer 1

61 Washer 1

62 Nut 1

63 Shims ar

64 Seal Plate (or rear bearing retainer) 1

65 Capscrew 3

66 Oil Slinger 1

67 Sleeve, wear-front 1

68 Seal, oil-front 1

69 Sleeve, wear-rear 1

70 Seal, oil-rear 1

71 Plug, pipe 1

72 Breather 1

73 Oil gauge tube 1

74 Gauge, oil 1

75 Snap ring, internal 1

76 Spring, inner (not shown) 3 or 4

77 Spring, outer (not shown) 3 or 4

78 Seal, o-ring 1

79 Snap ring 1

80 Neutral Lock Arm 1

81 Spring, Compression 1

82 Roller Pin 1

83 Retaining ring 1

84 Roller Detent 1

85 Washer 1

86 Hex Head Capscrew 1

87 Hex Head Capscrew 1

88 Detent Locator 1

89 Clevis Pin 1

90 Stop, roller 2

91 Screw, set 2

92 Bearing, Camrol 2

93 Hex Nut 2

94 Plunger 2

95 Spring 2

96 Wear Pad 2

97 Plunger 1

98 Spring 1

99 Wear Pad 1

100 Plunger 2

101 Spring 2

102 Wear Pad 2

103 Shoulder Screw 3

104 Washer, shoulder screw 3

105 Washer 3

106 Hex Nut 3

107 Washer 6

108 Shoulder Screw 3

109 Washer, shoulder screw 3

110 Hex Nut 3

111 Spring, conical 1

170



Exploded View (SP111 and SP211 Series Clutches)

Note: Typical unit illustrated.

Typical SP111 Series Clutch with Bronze Throwout Collar

Typical SP211 Series Clutch with Ball-Type Throwout Collar

171



Exploded View (SP111C016 and SP211C022 Clutches)


172



Exploded View (Bearing Housing Configuration A)


173



Exploded View (Bearing Housing Configuration B)


174



Exploded View (Bearing Housing Configuration C)


175



Exploded View (Bearing Housing Configuration D)


176



Exploded View (Bearing Housing Configuration E)


177



Exploded View (Bearing Housing Configuration F)


178



Exploded View (SPE111 and SPE211 Series Throwout Mechanism)


179

Twin Disc, Incorporated Engineering Drawings


Engineering Drawings

The engineering drawings included are listed below.

Note: All part numbers listed in the following engineeringdrawings are for reference only and illustrate most of thevariations found in the SP111, SP211, SP311, RFD111and RFD211 Series PTOs. Please refer to your bill ofmaterial for part numbers specific to your model.

SP111HP SP111P203 Sheet 2 of 2

SP111HP SP111P204 Sheet 2 of 2 (Brg. Configuration A)

SP111P SP111P206 Sheet 2 of 2 (Brg. Configuration B)

SPE111HP SP111P325 Sheet 2 of 2



SP211OP SP211P204 Sheet 2 of 2 (Brg. Configuration C)

SP211P SP211P205 Sheet 2 of 2

SPE211HP SP211P213 Sheet 2 of 2

SP211P SP211P225 Sheet 2 of 2

SP311IL SP311P101 Sheet 2 of 2 (Brg. Configuration D)

SP311P SP311P301 Sheet 2 of 2 (Brg. Configuration E)

SP311OP SP311P306 Sheet 2 of 2 (Brg. Configuration F)

SP111 Clutch SP111C016 Sheet 2 of 2

SPE211 Clutch SP211C015 Sheet 2 of 2

Contact yourAuthorized Twin Disc Dealer

for the latest BOM andengineering drawings.

TWIN DISC, INCORPORATED RACINE, WISCONSIN 53403, U.S.A. 262-638-4000/262-638-4482 (FAX) WWW.TWINDISC.COM

#1022762 07/07

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