eaton series 760 heavy duty fixed displacement motor

Eaton® Series 760 Heavy Duty Fixed Displacement Motor

2 EATON Series 760 Fixed Displacement Motor E-MOPI-TM002-E1 September 2009

Series 760 Fixed Displacement Motor

Table of Contents

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Specifications and Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Model Codes 5

Input Shaft Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Positions 7 & 8

Main Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Position 9

End Cover and Loop Flushing Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Position 10

Speed Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Position 17

Operational Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Hydraulic Fluid Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

3EATON Series 760 Fixed Displacement Motor E-MOPI-TM002-E1 September 2009

• 430 bar pressure rating

• Speeds to 3,200 rpm

• Standard integral shuttle valve design

• High corner power

• Agricultural sprayers

• Directional drilling

• Dozers

• Large harvesting machines

• Marine thrusters

The Series 760 Fixed Displacement Motor, combines the time-tested reliability you expect from Eaton with compact packaging, exceptional control and quiet operation .

• The Series 760 motor’s single piece cast iron housing provides excep-tional strength for high pressure operation and soundproofing .

• Standard integral shuttle valve design with option-al bolt-on valve configura-tions for same side or rear ports .

• High-efficiency inline axial piston design with high-speed/high-flow capabilities and high corner power .

• A variety of available drive shaft configurations — straight keyed, tapered keyed, or 13T or 27T splined–ensures the proper shaft for your application .

• The code 62 ports are available with SAE and metric threads .

The Eaton Series 760 Fixed Displacement Motor

Features Typical Applications

• Material handling

• Railway maintenance

• Sewer cleaning equipment

• Snow groomers

• Tub grinder


Specifications and Performance

Specifications

Performance

System Pressure 3500 psi (240 bar)Charge Presssure 400 psiOil Viscosity 60 SUSTemperature 180°F (82°C)

Note: Operating the motor below 50 rpm is not recommended .

Model 130 160

Displacement cc/rev (in3/rev) 130 (7.93) 160 (9.76)

Mounting Flange SAE D DMaximum Shaft Speed rpm @ 18° 3200 2950Nominal Pressure* bar (psi) 430 (6250) 430 (6250)Peak Pressure* bar (psi) 500 (7250) 500 (7250)Case Pressure Continuous bar (psi) 3 (40) 3 (40)Case Pressure Maximum bar (psi) 14 (200) 14 (200)Maximum Output Torque Nm 890 1,095 (lb-in) (7,900) (9700)Temperature Rating °C 82° C 82° C °F 180° F 180° F

Motor Speed RPM

Inpu

t Flo

w g

pm [l

pm]

Input Flow vs Speed

40 60 50 80 100 200 300 400 600 800 1000 2000 3000 4000 1.0

2.0

3.0 4.0 6.0

10.0

20.0

30.0 40.0

60.0

100.0

150.0

130 cc 160 cc

40 60 80 100 200 400 600 800 1000 2000 4000Motor Speed RPM

Out

put T

orqu

e lb

-in

[Nm

]

Output Torque vs Speed

5 hp 3.75 kW

10 hp 7.5 kW

20 hp 14.9 kW

50 hp 37.3 kW 100 hp

75 kW

400 hp 300 kW

200 hp 150 kW

3,000 [340]

4,000 [450]

5,000 [570]

6,000 [680]

7,000 [790]

8,000 [900]

9,000 [1020]

10,000 [1130] 160cc @ 6,000 psi [414 bar]

130cc @ 3,000 psi [207 bar]

160cc @ 3,000 psi [207 bar]

130cc @ 6,000 psi [414 bar]

* Nominal Pressure: Max delta system pressure at which component fatigue does not occur (pump life estimated by bearing life) . * Peak Pressure: Max operation pressure which is permissible for a short duration of time (t < 1 sec) .

The following chart shows the expected bearing life with no external shaft side load and charge pressure of 304 psi .

Model Code Number 130 160

Displacement cc/rev (in3/rev) 130 (7.93) 160 (9.76)

Shaft Speed rpm 3200 1800 2950 1800Continuous Pressure – ∆P bar (psi) 290 (4250) 290 (4250) 240 (3500) 240 (3500)Bearing Life – L10 hours 10,000 18,000 10,000 15,900Bearing Life – L20 hours 33,700 46,400 31,700 48,500


Model Codes The following 22 digit coding system has been developed to identify preferred feature options for the Series 760 Fixed Displacement Motor . Use this code to specify a motor with the desired features . All 22-digits of the code must be present to release a new product number for ordering .

1,2,3 Product

AEA – Hydrostatic Fixed Displacement Motor

4,5,6 Displacement

130 – 130,0 cm3/r (7 .93 In3/r) at 18° Swashplate angle

160 – 160,0 cm3/r (9 .76 In3/r) at 18° Swashplate angle

7, 8 Input Shaft

01 – (1 .750) Diameter Straight With ( .4375) x (1 .00) Square Key

02 – (1 .750) Diameter Tapered With ( .4375) x (1 .00) Square Key

13 – 13 Tooth 8/16 Pitch Spline

27 – 27 Tooth 16/32 Pitch Spline

9 Main Ports

A – 31,75 (1 .25) SAE 4-bolt split flange port, high pressure series (code 62)

B – 31,75 (1 .25) SAE 4-bolt split flange port, high pressure series (code 62) with M12 x 1 .75 threaded holes

10 End Cover and Loop Flushing Valve

A – Same side ports, integral loop flushing valve with high-rate springs

B – Same side ports, integral loop flushing valve with low-rate springs

C – Same side ports, valve block loop flushing with high-rate springs

D – Same side ports, valve block loop flushing with

low-rate springsE – Rear ports, integral

loop flushing valve with high-rate springs

F – Rear ports, integral loop flushing valve with low-rate springs

G – Rear ports, valve block loop flushing with high-rate springs

H – Rear ports, valve block loop flushing with low-rate springs

11 Charge Pressure Relief Valve

0 – No relief valve1 – Standard2 – Orificed charge

pressure relief valve (for composite valve blocks only)

12 Charge Pressure Relief Valve Setting

A – NoneB – 11,0 bar (160 lbf/in2)C – 12,4 bar (180 lbf/in2)D – 13,8 bar (200 lbf/in2)E – 15,2 bar (220 lbf/in2)F – 16,6 bar (240 lbf/in2)G – 17,9 bar (260 lbf/in2)H – 19,3 bar (280 lbf/in2)J – 20,7 bar (300 lbf/in2)K – 22,1 bar (320 lbf/in2)L – 22,5 bar (326 lbf/in2)

valve block onlyM – 23,4 bar (340 lbf/in2)N – 24,1 bar (350 lbf/in2)

valve block onlyP – 24,8 bar (360 lbf/in2)R – 25,5 bar (370 lbf/in2)

valve block onlyS – 26,2 bar (380 lbf/in2)T – 26,9 bar (390 lbf/in2)

valve block onlyU – 28,3 bar (410 lbf/in2)

valve block onlyV – 30,0 bar (435 lbf/in2)

valve block only

13 High Pressure Relief Valve – Port A

0 – None1 – Standard with threaded

retainer2 – Remote pilot operated

relief valve with threaded retainer

14 High Pressure Relief Valve Setting – Port A

A – NoneB – 103 bar (1500 lbf/in2)C – 138 bar (2000 lbf/in2)D – 172 bar (2500 lbf/in2)E – 207 bar (3000 lbf/in2)F – 241 bar (3500 lbf/in2)G – 276 bar (4000 lbf/in2)H – 310 bar (4500 lbf/in2)J – 345 bar (5000 lbf/in2)K – 379 bar (5500 lbf/in2)L – 414 bar (6000 lbf/in2)M – 431 bar (6250 lbf/in2)N – 448 bar (6500 lbf/in2)P – 466 bar (6750 lbf/in2)

15 High Pressure Relief Valve – Port B

0 – None1 – Standard with threaded

retainer2 – Remote pilot operated

relief valve with threaded retainer

16 High Pressure Relief Valve Setting – Port B

A – NoneB – 103 bar (1500 lbf/in2)C – 138 bar (2000 lbf/in2)D – 172 bar (2500 lbf/in2)E – 207 bar (3000 lbf/in2)F – 241 bar (3500 lbf/in2)G – 276 bar (4000 lbf/in2)H – 310 bar (4500 lbf/in2)J – 345 bar (5000 lbf/in2)

K – 379 bar (5500 lbf/in2)L – 414 bar (6000 lbf/in2)M – 431 bar (6250 lbf/in2)N – 448 bar (6500 lbf/in2)P – 466 bar (6750 lbf/in2)

17 Speed Sensor 0 – No sensor1 – Digital sensor with

3 wire weather pack connector

2 – Sensor hole (5/8-18 UNF thread) plugged (for digital sensor)

3 – Quadrature sensor with 4 wire weather pack connector (one 24 pulse per rev speed signal and one directional signal)

4 – Quadrature sensor with 4 wire weather pack connector (two 12 pulse per rev speed signal in quadrature)

5 – Sensor hole (9/16-32 UN thread) plugged (for quadrature sensor)

18,19 Special Features 00 No special features01 Metal case drain plug

in both ports02 Nametag opposite

dowel pin

20 Paint and Packaging A – Painted primer blue

(standard)

21 Identification on Unit 0 – Standard

22 Design Code A – A

ADZ XXX XX X X X X X X X X X XX A D A

4,5,6 7, 8 18,191,2,3 17 2215 2011 139 16 2112 1410


Input Shaft OptionsModel Code Position 7, 8

Code 02(1 .750) Diameter Tapered With ( .4375) X (1 .00) Square Key

Note

1 Tapered Shaft Compatible with ISO 3019/1 [SAE-J744] Specification

Square Key X Long

11,125±0,025[.4380±.0005]

25,40±0,60[1.000±.025]

Ø 3,96[.156]

Thru

22,23±0,25[.875±.010]

125±0,33 Taper per Meter [1.500±.004] Taper per Foot

54,46[2.144]

85,8[3.38]

Ø 44,50±0,08

[1.752±.003]

Ø 76,2±0,5[3.00±.02]

1.250-18 UNEF-2B Grade 5 Slotted Hex Locknutper SAE J-501 (Except 47,7[1.88] Across Flat)Recommended Torque to 542 Nm [400 lbf/ft]Plus Torque Required to Align Slotted Nut to Shaft Cross Hole Not to Exceed 813 Nm [600lbf/ ft]. Lubricate Nut Face and Shaft Threads

Ø 76.2±0.5[3.00±.02]

87.4[3.44]

79.5[3.13]

44.45 +0.00-0.05

1.750 +.000-.002[ ]

49.31±0.12[1.942±.005]

Ø

1,125±0,025[.4380±.0005]

25,40±0,60[1.000±.025]

Square Key X Long

-z-Code 01

(1 .750) Diameter Straight With ( .4375) X (1 .00) Square Key


Input Shaft OptionsModel Code Position 7, 8

Code 1313 Tooth 8/16 Pitch SplineTorque 1921 Nm17,000 lbf-in

Ø

Ø

76.2±0.53.00±.02[

74.42[2.930]

66.68±0.5[2.625±.020]

43,650±0,064[1.7185±.0025]

Involute SplineFillet Root Side Fit13 Tooth 8/16 PitchWill Fit ANSI B92.1 1970Class 5 Mating Splines

-Z-

74.4[2.93]

Ø 76.2±0.5[3.00±.02]

Ø 44.07±0.13[1.735±.005]

66.68±0.5[2.625±.020]

Involute SplineFillet Root Side Fit27 Tooth 16/32 PitchWill Fit ANSI B92.1 1970Class 5 Mating Splines

-Z-

Code 27 27 Tooth 16/32 Pitch SplineTorque 734 Nm6,500 lbf-in


Main PortsModel Code Position 9

Code A31,75 (1 .25) SAE 4-Bolt Split Flange Port, High Pressure Series (Code 62)

1.25 SAE 4-Bolt Split Flange PortHigh Pressure Series (Code 62)

33,32[1.312]

66,68[2.625]

15,88[.625]

31,75[1.250]

Ø31,75

1.250

+0,15-0,18

+.006-.007

4X 1/2-13 UNC-2B D 26.9 {1.06} Min

[ ]

68,58[2.700]

Centerline of Drive Shaft

-Z- 301,90[11.886]

Front Mounting Flange

1.25 SAE 4-Bolt Split Flange PortHigh Pressure Series (Code 62)

33,32[1.312]

66,68[2.625]

15,88[.625]

31,75[1.250]

Ø31,75

[1.250 ]

+0,15-0,18

+.006-.007

4X M12 X 1,75-6HD 26,9 [1.06] MIN

68,58[2.700]

Centerline of Drive Shaft

-Z- 301,90[11.886]

Front MountingFlange

Code B

31,75 (1 .25) SAE 4-Bolt Split Flange Port, High Pressure Series (Code 62) with M12 X 1 .75 Threaded Holes


120,7[4.75]

120,7[4.75]

119,13[4.690]

125,6[4.95]

2X 38,1[1.50]

2X 75,4[2.97]

80,8[3.18]

161,5[6.36]

80,8[3.18]

161,5[6.36]

4X R10,7[.42]

Port EGauge Port for HighPressure at Port A9/16-18 UNF-2BSAE O-ring Port

Unit Is Bi-rotationalFlow Into Port A Produces CW RotationFlow Into Port B Produces CCW Rotation

CCW CW

Port F Gauge Port for HighPressure at Port B9/16-18 UNF-2BSAE O-ring Port

-z-

-z-

2x 101,6[4.00]

2x 301,9[11.886]

312,6[12.31]

68,6[2.70]

68,6[2.70]

22,4[.88]

44,1[1.74]

12,7 +0,0-0,5

.500 +.000-.020[ ]

120,32[4.737]

R 1,19[.047]

2x Port E and F329,08[12.956]

101,6[4.00]

325,27[12.806]

Ø 152,4 +0,00-0,07

6.000 +.000-.003[ ]

Ø 149,45[5.884]

32°

348[13.70]

AlternateNameplateLocation

Nameplate

Port CCase Drain Port1 5/16-12 UN-2BSAE O-ring Port

Port DCase Drain Port1 5/16-12 UN-2BSAE O-ring Port

Port JGauge Port forCharge Pressure3/4-16 UNF-2BSAE O-ring Port

Connector To Mate WithWeather Pack ConnectorPart Number 12015793Connector 12010717Pins (3) 12033674Seals (3) 12015323

(ISO 30191/1 SAE-J744 D-mount)Mounting Flange Specificationwith Groove For O-ring

Port BFor Port OptionsSee Separate PortInstallation Drawing

For Shaft Options See Separate ShaftInstallation Drawing

Port AFor Port OptionsSee Separate PortInstallation Drawing

Code A Same Side Ports, Integral Loop Flushing Valve with High-Rate Springs

End Cover and Loop Flushing Valve Model Code Position 10

Code B Same Side Ports, Integral Loop Flushing Valve with Low-Rate Springs


-z-

-z-

2x 101,64.00[ ]

2x 301,9[11.886]

68,6[2.70]

68,6[2.70]

22,4.88[ ] 44,1

[1.74]

12,7 +0,0-0,5

.500 +.000-.020[ ] 120,32

4.737[ ]

R 1,19.047[ ]

325,2712.806[ ]

Ø152,4 +0,00-0,07

6.000 +.000-.003[ ]

Ø 149,455.884[ ]

32°

101,64.00[ ]

2x 329,0812.956[ ]

437,817.24[ ]


Nameplate



Port JGauge Port forCharge Pressure3/4-16 UNF-2BSAE O-ring Port(Iso 30191/1 SAE-J744 D-Mount)

Mounting Flange SpecificationWith Groove for O-ring

Section D-D




Code C Same Side Ports, Valve Block Loop Flushing with High-Rate Springs

Code DSame Side Ports, Valve Block Loop Flushing with Low-Rate Springs


120,74.75[ ]

120,74.75[ ]

125,64.95[ ]

80,83.18[ ]

161,56.36[ ]

80,83.18[ ]

161,56.36[ ]

4x R 10,7.42[ ]

119,134.690[ ]

Unit Is Bi-rotationalFlow Into Port A Produces CW RotationFlow Into Port B Produces CCW Rotation

CCW CW


2x 101,64.00[ ]

311,212.25[ ]22,4

[.88]44,1

[1.74]

12,7 +0,0-0,5

.500 +.000-.020[ ] 120,32

4.737[ ]

R 1,19[.047]

Ø 152,4 +0,00-0,07

6.000 +.000-.003[ ]

Ø 149,455.884[ ]

32°

345,413.60[ ]

Face of A and B Ports343,3113.5[ ]


Nameplate




(ISO 30191/1 SAE-J744 D-mount)Mounting Flange Specificationwith Groove for O-ring


4.00

Port JGauge Port forCharge Pressure3/4-16 UNF-2BSAE O-ring Port


Code E Rear Ports, Integral Loop Flushing Valve with High-Rate Springs

Code F Rear Ports, Integral Loop Flushing Valve with Low-Rate Springs

80,8[3.18]

161,5[6.36]

80,8[3.18]

161,5[6.36]

4x R 10,7[.42]

152,4[6.00]

68,5868,58[2.700] [2.700]

2x 114,3[4.50]

Unit is Bi-rotationalFlow into Port A Produces CW RotationFlow into Port B Produces CCW Rotation

Ccw Cw



Port-FGauge Port For High Pressure at Port B7/16-20 UNF-2B O-ring Fitting SizeAccepts Fitting for SAE-J1926

4.754.75

4.95

2x 1.50

2x 2.97

Port F Gauge Port for HighPressure At Port B9/16-18 UNF-2BSAE O-ring Port

Port EGauge Port For HighPressure at Port A9/16-18 UNF-2BSAE O-ring Port


2x 101,64.00[ ]

311,212.25[ ]22,4

.88[ ] 44,11.74[ ]

12,7 +0,0-0,5

.500 +.000-.020[ ] 120,32

4.737[ ]

R1,19.047[ ]

Ø 152,4 +0,00-0,07

6.000 +.000-.003[ ]

Ø 149,455.884[ ]

32°

345,413.60[ ]

Face of A and B Ports343,3113.5[ ]

94,513.7[ ]


Nameplate




(ISO 30191/1 SAE-J744 D-mount)Mounting Flange Specificationwith Groove for O-ring

Port GOptional Gauge Port for Charge Pressure7/16-20 UNF-2B O-ring Fitting SizeAccepts Fitting For SAE-J1926


Valve Block Mounting Surface

120,74.75[ ]

120,74.75[ ]

125,74.95[ ]

80,83.18[ ]

161,56.36[ ]

80,83.18[ ]

161,56.36[ ]

4X R10,7.42[ ]

152,46.00[ ]

68,582.700[ ]

68,582.700[ ]

2X 114,34.50[ ]

Unit is Bi-rotationalFlow into Port A Produces CW RotationFlow into Port B Produces CCW Rotation

CCW CW



Port EGauge Port For High Pressure at Port A7/16-20 UNF-2B O-ring Fitting SizeAccepts Fitting For SAE-J1926

Port FGauge Port for High Pressure at Port B7/16-20 UNF-2B O-ring Fitting SizeAccepts Fitting for SAE-J1926


Code G Rear Ports, Valve Block Loop Flushing with High-Rate Springs

Code H

Rear Ports, Valve Block Loop Flushing with Low-Rate Springs


Packard Electric Weather Pack Series 12010717 Connector (Black With Index Code 101) (Mates With 12015793, Connector And 12089188, Sleeve Terminal Female) 12015323 Seal (3 Seals) 12089040 Pin (3 Pins)

CBA

Black to Pin C

Green to Pin B

Red to Pin A

2.2k

Sensor

Red

Green

Black

Output CircuitWiring Instructions

PowerSupply

SignalOutput

Common

(+)Pin A

Pin B

Pin C

Speed SensorModel Code Position 17

Code 0No Sensor

Code 1Digital Sensor with 3 wire weatherpack connector

Code 2 Sensor Hole (5/8-18 UNF Thread) Plugged (For Digital Sensor)

Supply Voltage 4 .5Vdc to 16Vdc

Supply Current 20mA Max

Logic Zero State 400mV at 20mA Sink Current

Operating Temperature: 40°F to +257°F (-40°C To +125°C)

Operating Frequency OHz to 5KHz

Duty Cycle 20% to 80%

Sink Current: 25mA Max


Speed SensorModel Code Position 17

Pin C OutputSignal

10k

Pin B

Pin D

Pin A

Common

OutputSignal

PowerSupply

Output CircuitWiring Instructions

Black

Red

Sensor

10k

Code 3 Quadrature Sensor with 4 Wire Weather Pack Connector (One 24 Pulse Per Rev Speed Signal and One Directional Signal)

Supply Voltage: (Vs) 8 to 28 Vdc (Functional Range)

Supply Current: (Is) 40mA (Including Internal Pull-up Resistor)

Switching Frequency: 7 to 3k Hz

Output: Open Collector eith 10k OHm Pull-up Resistor

Output Voltage Low: (Vol) 0 .5 Vdc Max at 10 Ma

Pulse Width: 20 to 80% of Duty Cycle (with Specified Target)

Connector Pin Color-signal

Output Types A B C DCode 3 One Speed Signal Providing 2 Pulse Per Target Red-Power Black-common Blue-speed White-direction Tooth and One Directional SignalCode 4 Two Speed Signals in Quadrature Each Providing Red-Power Black-common Orange-output 1 Yellow-output 2 1 Pulse Per Target Tooth

Code 5

Sensor Hole (9/16-32 UN Thread) Plugged (For Quadrature Sensor)

Code 4 Quadrature Sensor with 4 Wire Weather Pack Connector (Two 12 Pulse Per Rev Speed Signal in Quadrature)

Target Motion This Direction: Output 2 Leads Output 1 or Direction Output Goes High

Target MotionThis Direction:Output 1 Leads Output 2 orDirection Output Goes Low

C

A-A Section

A

A D

B A

Orientation Groove(Align with TargetMotion)

Packard Electric Weather Pack Series

1201 5797 Tower Connector (Black with Index Code 101)

1201 5323 Seal (4x)

1208 9188 Sleeve (Female) Terminals (4x)

(Mates with 1201 0974, Connector and 1208 9040, Male Terminal)

Output 1 and 2 are quadrature outputs with a phase angle difference of 90°±45° . The speed output signal is the exclusive or of output 1 and output 2 . The direction output signal is derived from the last and current states of output 1 and 2 .


Char

gePu

mpSh

uttle

Valv

e

Char

ge

Pres

sure

Relie

f Val

ve

Heat

Exc

hang

er

Heat

Exc

hang

erBy

-Pas

s Va

lve

Filte

r

Man

ual D

ispl

acem

ent

Cont

rol V

alve

Inte

rnal

Dra

ined

to

Pum

p Ca

se

Varia

ble

Pum

pSw

ashp

late

Fixe

d M

otor

Fixe

d M

otor

Swas

hpla

te

Varia

ble

Pum

p

Orifi

ce

Orifi

ces

Serv

o Co

ntro

l Cyl

inde

r

Inle

t Flo

wCa

se P

ress

ure

Cont

rol P

ress

ure

Char

ge P

ress

ure

High

Pre

ssur

e

Typi

cal S

erie

s 76

0 V

aria

ble

Disp

lace

men

t Pum

p/Fi

xed

Disp

lace

men

t Mot

or S

chem

atic

Not

e:Fo

r eas

e of

vie

win

g,th

e Se

rvo

Cont

rol

Cylin

der,

Swas

hpla

te,

and

Cont

rol V

alve

are

show

n re

mov

ed

from

the

pum

p

Bubb

leSe

para

tor

Scre

en30

° to

Hor

izon

Rese

rvoi

r

Low

Pres

sure

Relie

fVa

lve

Operational Diagram


Application Information

Component DescriptionsThe Operational Diagram on page 15 shows a typical heavy duty hydrostatic transmission . The axial piston pump and axial piston motor are the main components . The filter, reservoir, heat exchanger, and oil lines make up the rest of the system . The function of each of these components is described below:

A separate energy source, such as an electric motor or internal combustion engine, turns the input shaft of the pump .

Variable Displacement Axial Piston PumpThe variable displacement pump provides a flow of high pressure oil . Pump output flow can be varied to obtain the desired motor output speed . For example, when the pump’s displacement is zero, no oil is pumped and the transmission’s motor output shaft is stopped . Conversely, maximum pump displacement produces maximum motor shaft speed . The direction of high pressure flow can also be reversed; doing so reverses the direction the motor output shaft rotates .

A charge pump is integrated into the piston pump and driven by the shaft of the piston pump . The drawing illustrates a suction filtration circuit . Eaton recommends a suction filter without a bypass valve . The charge pump has a Low Pressure Relief Valve that regulates the output pressure .

Eaton’s Series 760 Pump offers High Pressure Relief Valves and Pressure Override Control for system high pressure protection . These valves are integrated into one cartridge valve called the Integrated Valve System or IVS .

Fixed Displacement Axial Piston MotorThe motor uses the high pressure oil flow from the pump to produce transmission output . The high pressure oil comes to the motor through one of the high pressure lines . It enters the motor, turns the output shaft, then returns to the pump . Eaton piston motors integrate a hot oil shuttle and low pressure relief valve into the end cover . The shuttle valve and low pressure relief valve direct excess charge pump flow into the motor case . The shuttle valve is activated by high pressure and directs excess charge pump flow over the low pressure relief valve . This flushing action allows the charge pump to provide clean, cool oil to the closed loop circuit .

ReservoirThe reservoir is an important part of the hydrostatic transmission system . It should provide adequate oil storage and allow easy oil maintenance .

The reservoir must hold enough oil to provide a continuous oil supply to the charge pump inlet . It must also have enough room for the hydraulic oil to expand as the system warms up .

Consider charge pump flow when sizing the reservoir: One half ( .5) minute times (X) the maximum charge pump flow should be the minimum oil volume in the reservoir . Maintaining this oil volume will give the oil a minimum of thirty (30) seconds in the reservoir . This will allow any entrained air to escape and contamination to settle out of the oil .

To allow for oil expansion, the reservoir’s total volume should be at least six tenths ( .6) minute times (X) the maximum charge pump flow .

The reservoir’s internal structure should cut down turbulence and prevent oil aeration .

The line returning flow to the reservoir should be fitted with a diffuser to slow the incoming oil to 1 to 1 .2 meters (3-4 feet) per second to help reduce turbulence . The return flow line should also be positioned so that returning oil enters the reservoir below the liquid surface . This will help reduce aeration and foaming of the oil .

The reservoir should have baffles between the return line and suction line . Baffles prevent return flow from immediately reentering the pump .

A sixty mesh screen placed across the suction chamber of the reservoir will act as a bubble separator . The screen should be placed at a thirty degree angle to the horizon .

The entrance to the suction line should be located well below the fluid surface so there is no chance of air being sucked into the charge pump inlet . However, the suction line entrance should not be located on the bottom of the reservoir where there may be a buildup of sediment . The suction line entrance should be flared and covered with a screen .

The reservoir should be easily accessible . The fill port should be designed to minimize the possibility of contamination during filling and to help prevent over filling . There should be a drain plug at the lowest point of the reservoir and it should also have a clean-out and inspection cover so the reservoir can be thoroughly cleaned after prolonged use . A vented reservoir should have a breather cap with a micronic filter .

Sealed reservoirs must be used at altitudes above 2500 feet . These reservoirs should be fitted with a two way micronic filter pressure cap to allow for fluid expansion and contraction .

In both cases the caps must be designed to prevent water from entering the reservoir during bad weather or machine washing .

A hydrostatic transmission with a well designed reservoir will run quieter, stay cleaner and last longer .



FilterA filter must be used to keep the hydraulic fluid clean . Either a suction filter or a pressure side filter may be used . The filter must be a no-bypass type . A suction filter is shown in the operational diagram on page 15 . System oil particulate levels should not exceed ISO 18/13 . Refer to Eaton Hydraulic Fluid Recommendations on pages 19-22 .

Recommended beta ratios for each filter type are listed below:

Suction Filter ß10 = 1 .5 to 2 .0

Pressure Side Filter ß10 = 10 to 20

When a suction filter is used, its flow capacity must be large enough to prevent an excessive pressure drop between the reservoir and charge pump inlet . The pressure at the charge pump inlet port must not be less than 0 .8 bar (11 .6 psi) absolute at normal continuous operating temperatures .

Charge Pump Inlet Line The inlet line to the charge pump should be large enough to keep the pressure drop between the reservoir and charge pump inlet within the limits described in the filter section . Fittings will increase the pressure drop, so their number should be kept to a minimum . It is best to keep fluid velocities below 1,25 meters (4 feet) per second .

Fluid and temperature compatibility must be considered when selecting the inlet line .

Pump and Motor Case Drain Lines The case drain lines should be large enough to limit the pump and motor case pressures to 2,8 bar (40 psi) at normal operating temperatures . Fluid and temperature compatibility must also be considered when selecting the case drain lines .

High Pressure Lines The high pressure lines that connect the pump and motor must be able to withstand the pressures generated in the high pressure loop .

Heat Exchanger Use of a heat exchanger is dependent on the transmis-sion’s duty cycle and on machine layout . The normal continuous operating fluid temperature measured in the pump and motor cases should not exceed 80°C (180°F) for most hydraulic fluids . The maximum fluid temperature should not exceed 105°C (220°F) .

The heat exchanger should be sized to dissipate 25% of the maximum input power available to the transmission . It must also be sized to prevent the case pressures in the pump and motor from getting too high . Case pressure up to 2 .8 bar (40 psi), at normal operating temperatures, are acceptable .

Heat Exchanger Bypass Valve The heat exchanger bypass valve is a pressure and/or temperature valve in parallel with the heat exchanger . Its purpose is to prevent case pressures from getting too high . The heat exchanger bypass valve opens when the oil is thick, especially during cold starts .

Reservoir Return Line The same general requirements that apply to case drain lines apply to the reservoir return line .



Shaft Couplings and Mounting Brackets Shaft couplings must be able to with stand the torque that will be transmitted to the pump or motor . If the pump or motor is to be directly coupled to the drive, the misalignment should not exceed .050 mm ( .002 in .) total indicator run-out for the combination of perpen-dicularity and concentricity measurements .

The hardness of the couplings connected to Eaton pump or motor shafts should be 35 Rc for tapered or straight keyed shafts and 50-55 Rc for splined shafts .

Open Loop Circuits Eaton heavy duty pumps and heavy duty motors may be used in open loop circuits under certain operating conditions . Consult your Eaton repre-sentative for details .

Orientation The mounting orientation of Eaton heavy duty pumps and motors is unrestricted . The case drain line that carries the flow leaving the pump or motor should be connected to the highest drain port on each of the units . This assures that the pump and motor cases remain full .

Multiple Pump or Motor Circuits Multiple pumps or motors can be combined in the same circuit . When two pumps are used in a parallel circuit, their swashplate controls can be operated in phase or in sequence . The following precautions should be observed whenever multiple pumps and/or motors are connected in the same circuit:

1 . Charge pump flow must be greater than the sum of the charge pump flow requirements of the individual units .

2 . The possibility of motor overspeeding increases in multiple motor circuits . The parallel motor circuit will act as a frictionless differential . Should one of the motors stall the other could overspeed . The motors used in parallel circuits should, therefore, be sized to prevent overspeeding . Valves that will limit the flow to each of the motors may be used to prevent overspeeding . This will allow the use of smaller motors, however the flow limiting valves will create heat .

3 . When using one pump with multiple motors, the case drain lines should be connected in series . The case flow should be routed from the most distant motor, through the remaining motors, to the pump, and finally back to the reservoir . The most distant motor should have the valve block or integral shuttle valve while the additional motors do not need a valve block or

integral shuttle valve . A remote valve block is also available for multiple motor circuits . A series-parallel drain line circuit may be needed for the high case flow created in multiple pump circuits . In either case, each pump and motor should be checked for proper cooling when testing the prototype circuit .

4 . Series circuits present a unique problem for axial piston motors . Pressure applied to the input port and discharge port are additive as regards to the load and life of the drive shaft and the drive shaft bearings . Please consult with your Eaton repre-sentative regarding series circuits .


Hydraulic Fluid Recommendations

ObjectiveThe ability of Eaton hydrostatic components to provide the desired performance and life expectancy depends largely on the fluid used . The purpose of this document is to provide readers with the knowledge required to select the appropriate fluids for use in systems that employ Eaton hydrostatic components .

Selecting a Hydraulic FluidThe hydraulic fluids in hydraulic systems are bound to perform in different dimensions . They serve as the power transmission medium, lubricate the moving components and carry away the heat produced within the system . Therefore the fluids must have adequate properties to give the assurance of adequate wear protection, effective power transmission and excellent chemical stability under the most adverse operating conditions . The multi-dimensional performance establishes that the hydraulic fluid is

a vital factor in a hydraulic system; proper selection of oil assures satisfactory life and operation of the system components / lubricants .

ViscosityThe most important charac-teristics to consider when choosing a fluid to be used in a hydraulic system are viscosity . The fluid must be thin enough to flow easily but thick enough to seal and maintain a lubricating film between bearing and sealing surfaces . Viscosity requirements for Eaton’s Heavy Duty Hydrostatic product line are specified later in this document

Viscosity and TemperatureTemperature and viscosity are related inversely . As the fluid warms it gets thinner and its viscosity decreases . When fluid cools the fluid viscosity increases . It is important to consider the entire operating temperature window for selecting the right viscosity for a hydraulic system . Calculate the viscosity of the fluid temperatures at start up, normal operating

conditions and maximum possible point, and compare the same with the recommendation of the hydraulic system .

Generally, the fluid is thick when the hydraulic system is started . With movement, the fluid warms to a point where the cooling system begins to operate . From then on, the fluid is maintained at the temperature for which the hydrostatic system was designed . In actual applications this sequence varies; hydrostatic systems are used in many environments from very cold to very hot . Cooling systems also vary from very elaborate to very simple, so ambient temperature may affect operating temperature . Equipment manufac-turers who use Eaton hydrostatic components in their products should anticipate temperature in their designs and make the appropriate fluid rec-ommendations to their customers .

In general, a lower ISO viscosity grade fluid is recommended for operation in cold to moderate climates . Higher ISO viscosity grade fluid is recommended for operation in moderate to hot climates .

CleanlinessCleanliness of the fluid in a hydrostatic system is extremely important . Eaton recommends that the fluid used in its hydrostatic components be maintained at ISO Cleanliness Code 18/13 per SAE J1165 . This code allows a maximum of 2500 particles per milliliter greater than 5 µm and a maximum of 80 particles per milliliter greater than 15 µm . When components with different cleanliness requirements are used in the same system, the cleanest standard should be applied . OEM’s and distributors who use Eaton hydrostatic components in their products should provide for these requirements in their designs . A reputable filter supplier can supply filter information .



Viscosity and Cleanliness Guidelines

ISO Optimum Cleanliness Product Line Minimum Range Maximum Requirements Comments

Heavy Duty Piston 10cSt 16 - 39 cSt 2158 cSt 18/13Pumps and Motors (60 SUS) (80 - 180 SUS) (10,000 SUS)

Note: • Fluids too thick to flow

in cold weather start-ups will cause pump cavita-tion and possible dam-age . Motor cavitation is not a problem during cold start-ups . Thick oil can cause high case pressures which in turn cause shaft seal prob-lems .

• If the natural color of the fluid has become black it is possible that an over-heating problem exists .

• If the fluid becomes milky, water contamina-tion may be a problem .

• Take fluid level reading when the system is cold .

• Contact your Eaton rep-resentative if you have specific questions about the fluid requirements of Eaton hydrostatic com-ponents .



Maintaining correct fluid viscosity and cleanliness level is essential for all hydrostatic systems . Since Eaton hydrostatic components are used in a wide variety of applications it is impossible for Eaton to publish a fluid maintenance schedule that would cover

every situation . Field testing and monitoring are the only ways to get accurate measurements of system cleanliness . OEM’s and distributors who use Eaton hydrostatic components should test and establish fluid maintenance schedules

for their products . These maintenance schedules should be designed to meet the viscosity and cleanliness requirements laid out in this document .

• Fluids too thick to flow in cold weather start-ups will cause pump cavita-tion and possible dam-age . Motor cavitation is not a problem during cold start-ups . Thick oil can cause high case pressures which in turn cause shaft seal prob-lems .

• If the natural color of the fluid has become black it is possible that an over-heating problem exists .

• If the fluid becomes milky, water contamina-tion may be a problem .

• Take fluid level reading when the system is cold .

• Viscosity modified fluid may loose viscosity due to shearing of viscosity improvers .

• Contact your Eaton rep-resentative if you have specific questions about the fluid requirements of Eaton hydrostatic com-ponents .

Fluid Maintenance

AW hydraulic oilPremium grade petroleum based AW hydraulic fluids will provide the best performance in Eaton hydrostatic components . These fluids typically contain additives that are beneficial to hydrostatic systems . Eaton recommends fluids that contain anti-wear agents, rust inhibitors, anti-foaming agents, and oxidation inhibitors . Premium grade petroleum based hydraulic fluids carry an ISO VG rating .

Pump performance and reliability are directly affected by the anti-wear additive formulation contained in the oil . Oils providing a high level of anti-wear protection are recommended for optimum performance and long life .

Eaton has its own method to estimate Mineral / Petroleum based AW hydraulic oils for their anti-wear property . The fluid must pass Eaton Vickers® 35VQ25 pump test or meet the performance specification Eaton Vickers M 2950 S .

Engine Oils / Motor OilsEngine oils using hydraulic applications, must meet API SF / SG / SH or higher performance specifications . Appropriate SAE Grade to be selected based on the operating temperatures .

Fluid Selection

Additional Notes



Biodegradable Oil (Vegetable) Guidelines

Rating With Product Line Biodegradable Oil Comments

Heavy Duty Piston 80% of normal pressure rating 82° C (180° F) max fluid temp (unit) Pumps and Motors listed for mineral oils 71° C (160° F) max fluid temp (reservoir)

Additional Notes:• Viscosity and ISO cleanli-

ness requirements must be maintained as out-lined on previous page .

• For any system where the fluid is non-petro-leum oil, set the target one Range Code cleaner for each particle size, than that of petroleum fluids .

If the cleanest code required was 19/17/15 and HETG is the system fluid, the target becomes 18/16/14 .

• Based on limited prod-uct testing to date, no reduction in unit life is expected when operat-ing at the pressure rat-ings indicated above .

• Vegetable oil is mis-cible with mineral oil . However, only the vegetable oil content is biodegradable . Systems being converted from mineral oil to vegetable oil should be repeatedly flushed with vegetable oil to ensure 100% bio-degradability .

• Specific vegetable oil products may provide normal unit life when operating at pressure ratings higher than those indicated above .

• Vegetable oils oxidize more quickly than petro-leum based hydraulic fluid . Care must be taken to maintain fluid temperature within specified limits and to establish more frequent fluid change intervals .

• All seals must be Fluorocarbon (FKM) / Viton / HNBR .

• Specific gravity of the fluid is 0 .92 . Design circuit with reservoir oil level sufficiently above the pump inlet to assure a minimum of 1 .0 bar absolute pressure at pump .

• Water contamination may degrade the fluid - 0 .07% wt maximum . Precaution to be taken to avoid water contamina-tion .

• Foaming and aeration can be greater with this fluid than petroleum base oils . Reservoir may be designed to give maximum retention time for effective air release .

• TAN - 2 .0 mg KOH/gm Max increase in total acid number from the start up value .

EatonHydraulics Group USA14615 Lone Oak RoadEden Prairie, MN 55344USATel: 952-937-9800Fax: 952-294-7722www .eaton .com/hydraulics

EatonHydraulics Group EuropeRoute de la Longeraie 71110 MorgesSwitzerlandTel: +41 (0) 21 811 4600Fax: +41 (0) 21 811 4601

Eaton Hydraulics Group Asia PacificEaton Building4th Floor, No. 3 Lane 280 Linhong Rd. Changning DistrictShanghai 200335ChinaTel: (+86 21) 5200 0099Fax: (+86 21) 5200 0400

© 2009 Eaton CorporationAll Rights Reserved Printed in USADocument No . E-MOPI-TM002-E1Supersedes E-MOPI-TM002-ESeptember 2009

eaton series 760 heavy duty fixed displacement motor

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