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The strong partnership IMO has withBrück GmbH in Saarbrücken for seamless

rolled rings and Brück AM in Zamrsk, CzechRep., for CNC pre-machining, enables IMOto present a line of high performance, high

quality Slewing Rings and Slew Drives.

Brück is running five rolling mills with amonthly capacity up to 3,500 tons

(7,700,000 lbs)!

A strong partnership is created by Brückowners holding a 50 percent stake in IMO’sequity. For you as our customer, this enablesIMO to be a fast, flexible and reliable Slewing

Ring and Slew Drive manufacturer.

Preface & Imprint

IMO has developed, manufactured and soldinnovative Slew Drives to global customers for manyyears.

Our range of products is presented in this catalog.

Our wide range of standard size Slew Drives isunique on the market.

Special designs are also available, please contactour Engineering Department for assistance (thecontact details are on the back of the catalog).

This catalog has a reference number on the frontcover. Please always check this is the latest editionbefore using the information contained within it.

You will find the “Application Data Sheet” on page108/109 in this catalog. If you require assistancewith any Slew Drive application, please fill in thisform. This gives us an overview of the applicationand represents a record of your requirements.

Slew Drives are high-tech products. They have tomeet your requirements exactly and perform in theenvironmental conditions of your application.Therefore, it is important to fill in the formcompletely, with as much detail as possible andsend it to us. You will then receive ourrecommendation for the right IMO product for yourapplication and gain the benefit of years ofexperience meeting challenging customerrequirements and operating conditions!

The application data sheet can also be downloadedfrom our homepage www.goimo.com.

You can find information on our Slewing Ringproduct line in the Slewing Ring catalogDV 105 E, which we will send you on request.Further details of our company, products, and theirapplication and utilization can be found in ourdetailed brochure IM 104 E.

IMO terms and conditions shall apply to allquotations and purchase orders.

Further we would like to ask you to follow closelyour Installation and Maintenance Instructions whichcontain important data. You can find these onpages 46 to 51 of this catalog, or on our homepagewhich has the latest revision.

The observance of our Installation and MaintenanceInstructions is important for the reliability and safetyof our product and has a great influence on theservice-life.

The Installation and Maintenance Instructions arealso available in other languages. Please contactus or visit our homepage if you need the instructionsin a different language.

Our product range and designs are being continuallyupdated and revised. Please always check with usfor the latest information.

All the information in this catalog has been carefullyevaluated and checked. We cannot acceptresponsibility for omissions and errors in thispublication.

Published by

IMO Antriebseinheit GmbHGewerbepark 1691350 GremsdorfGermany

Telephone: +49 (0)9193-50 818-0Fax: +49 (0)9193-50 818-40Homepage: www.goimo.comEmail: slew.drives@goimo.com

Copyright © September 2005by IMO Antriebseinheit GmbH, Gremsdorf

No part of this catalog may be reproduced withoutthe written permission of the publisher. All rightsreserved, even if patent is granted.

Registered logoof IMOAntriebseinheit GmbH

Registered logoof Brück GmbH,Ensheim/Saarbrücken

®

®

The innovative business group IMO, withheadquarters in Gremsdorf, Germany, has beendesigning, manufacturing and supplyingSlewing Rings and self-contained Slew Drivesfor more than 16 years. IMO currently holdsEN ISO 9001:2000 approval and has beencertified since 1995.

IMO, with its modern manufacturing facilities,manufactures and delivers over 10,000 Balland Roller Slewing Rings and Slew Drives eachyear, in diameters up to 204 in. IMO is a globallyrecognized supplier of Slewing Rings andpatented Slew Drives.

IMO is proud to have been recently named oneof Bavaria’s Top 50 companies by the StateMinister of Economy. IMO has also earnedseveral technical awards at internationalexhibitions for new and innovative productintroductions.

®

Rolling millEnsheim/Saarbrücken

Nomenclature

Design typesWD: Worm gear driven typeSP: Spur gear driven type

WD – L 0223 / 3 – 01234

Drawing reference number

Gearing heat treatment1: Normalized2: Quenched and tempered3: Hardened

for WD-L and SP:for WD-H:

Identification for custom configurationsonly, i.e.A: American versionC: With or without hydraulic motorE: With or without electric motor

SeriesL: Light seriesI: Intermediate seriesM: Medium seriesH: Heavy series

Raceway diameter [mm]Bolt PCD ofworm wheel [mm]

3

Table of Contents

ProductInformation P. 4 - 31

0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,00

102030405060708090

f Md

EDm

ax ‘ [

% /

min

]

Diagramm

TechnicalInformation P. 32 - 45

Installation andMaintenanceInstructions P. 46 - 51

Series WD-LA P. 52 - 61

Series WD-H P. 62 - 73

Series SP-L P. 74 - 83

Series SP-I P. 84 - 89

Series SP-M P. 90 - 99

Series SP-H P. 100 - 107

4

Product Line Overview/Comparison

8.78013.50416.49618.81924.606

02230343041904780625

014602200300037304900645

03110411054106410741084109411091

0229041105410641

03110411054106410741084109411091

045505550655075508550955

Worm geardriven types

Spur geardriven types

8.07111.02414.56717.79522.40228.543

12.24416.18121.29925.23629.17333.11037.04742.953

9.01616.18121.29925.236

12.24416.18121.29925.23629.17333.11037.04742.953

17.91321.85025.78729.72433.66137.598

Series SP-H

Series SP-M

Series SP-I

Series SP-L

Series WD-H

Series WD-LA

1) The data refers to the minimumand maximum diameter per series

2) The tilting moment capacity foreach unit should be confirmed byreferring to the limiting loaddiagram for each individual model.

from 20,410 to 38,270

from 6,359 to 18,794

from 2,553 to 4,351

from 2,299 to 7,155

from 2,957 to 112,559

from 6,861 to 31,585

Design types Series Sizes Raceway diameters Maximumtorque 1)

[in]DL

[ft-lbs]Md max

Preloadedraceway system

Preloadedraceway system

Radial clearance0 - 0.0079 in

Axial tilting clearance0 - 0.0158 in

Radial clearance0 - 0.0079 in

Axial tilting clearance0 - 0.0158 in

Radial clearance0 - 0.0079 in

Axial tilting clearance0 - 0.0158 in

Radial clearance0 - 0.0099 in

Axial tilting clearance0 - 0.0158 in

from 106,200 to 404,100 from 321 to 675 from 120 to 252 from 419 to 706

from 22,800 to 220,500 from 100 to 352 from 42 to 151 from 177 to 441

from 16,200 to 87,000 from 95 to 207 from 35 to 88 from 93 to 188

from 10,300 to 107,600 from 46 to 164 from 20 to 70 from 100 to 265

from 37,600 to 775,900 from 271 to 1,618 from 101 to 793 from 139 to 1,059

from 20,600 to 234,500 from 122 to 531 from 45 to 198 from 106 to 552

Static axial load rating Static radial load rating

Weight 1)Load carrying capacity 1) ClearanceMaximum tiltingmoment 1) 2)

[ft-lbs] [lbs x 1,000] [lbs x 1,000] [lbs]Mk max C0 ax C0 rad G

5

Sle

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Intr

od

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ion

A complete unit

All components guaranteed to work together

Easy to order - simple to install

Eliminates component assembly

One source - total system responsiblity

Complete line of various standard sizes

Immediate, off-the-shelf availability

Online sizing and selection programs available at www.goimo.com

Extensive technical support

Easy selection

Slew Drive – what is it? What does it do?Where is it used?

A Ball or Roller Slewing Ring to handlesimultaneously occuring radial, axial andmoment loads

Hydraulic or electric motor to pitch or rotatethe Slewing Ring

A totally enclosed housing

A complete system, ready to install, consists of

Bolt, connect, run… done!

6

Wide range of loadcapacities

Peak torque up to 112,559 ft-lbs

Tilting moment load up to 775,900 ft-lbs

Raceway diameters : 8.071 up to 42.953 in

Special designs are also available in larger diameters

IMO -the driving force for

innovative technology

IMO Slew Drive in a totally enclosedhousing

Slew Drive protected from: - Contamination - Damage - Loss of lubrication

Provides: - Extended life - Reduced maintenance costs - Enhanced operator safety - Sleek, clean appearance

Advantages of IMO Slew Drives

Compact packages for space saving installations

Maximum load capacity in compact design

Extended life

Reduced maintenance costs

Easy to integrate into existing applications

Modular construction allows very quick modifications

Special designs available

Used by customers around the globe in:

Vehicle and crane steering systems

Manlift systems for boom and basket rotation

Light crane systems

Rotation of attachments such as excavators, grabs and fork lifts

Handling equipment (automation systems)

Loading and unloading devices

Positioning systems / turntables

7

8

WD

-L S

eri

es

Pro

du

ct D

esc

rip

tio

n

Name plate

Type / serial number Reference number for spare part orders

Connection point for potentiometer, permanentbrake or manual turning

Integrated self-locking brake system provides reliable, safe and smooth operation No stick/slip or sudden lurching when starting movement Easy access to hex connection allows quick emergency manual operation

Worm drive

High torque transmission Complete toothed worm gear Maximum load capacity and extended life Reduced backlash Self-locking and non-self-locking models

Grease nipple

For raceway

Housing

Totally enclosed Self-supporting

Grease nipple

For worm gear

Ball Slewing Ring

Single or double raceway design Outer ring with toothed worm gear

Motor

Hydraulic or electric motor driven With or without gearbox Can be delivered without a motor Industry standard motor connection

Bolt hole

For unit mounting

WD

-H S

eri

es

Pro

du

ct D

esc

rip

tio

n

Axial bearing for the worm shaft

Seal

Roller Slewing Ring

Angular contact cylindrical roller bearing Inner ring with toothed worm gear Maximum load carrying capacity

Connection point for attachments

Brakes Feedback sensors / potentiometer

Housing

Totally enclosed Self-supporting

Name plate

Type / serial number Reference for spare part orders

Motor

Single or twin motors (standard or double torque capacity) Hydraulic or electric Can be delivered without a motor Industry standard motor connection

Grease nipple

For raceway For worm gear

Worm drive

High torque transmission Complete toothed worm gear Maximum load capacity/extended life Reduced backlash Single and double-lead worm Self-locking and non-self-locking models

Bolt hole

For unit mounting

9

10

Drive motor

Hydraulic/electric With or without gearbox Single or twin motors

Drive pinion

Hardened With or without support bearing in the housing

Seal

Protects against contamination Prevents loss of lubrication

Name plate

Type / serial number Reference number for spare part orders

SP S

eri

es

Pro

du

ct D

esc

rip

tio

n

Grease nipple

For bearing ring gear

Grease nipple

For raceway

Bolt hole

For unit mounting

Housing

Totally enclosed Self-supporting

Support of torque

Slewing Ring and housing are assembled using countersunk connectors, providing smooth mounting surface Matches industry standard height dimensions

Ball Slewing Ring

External toothing High load carrying capacity

SP-L Slew Drive with three-phase electricalmotor and spur gearbox

11

WD-L Slew Drives from IMO have animpressive combination of unique features.WD-L series comprises 7 standard models

WD-L 0223 Single Row Slewing Ring

WD-L 0223 Double Row Slewing Ring

WD-L 0343 Single Row Slewing Ring

WD-L 0419 Single Row Slewing Ring

WD-L 0419 Double Row Slewing Ring

WD-L 0478 Single Row Slewing Ring

WD-L 0625 Single Row Slewing Ring

IMO Slew Drives, with a wide range of industrystandard sizes and torque capacities offer fast,cost effective slewing solutions.

WD

-L S

lew

Dri

ves

Overv

iew

12 13

Modular system enables the utilization of various motors(e.g. WD-L 0419)

Basic version WD-L 0419without motor

Version with hydraulic motor

Version with a three-phaseelectrical motor and spurgearbox

WD-L 0419 with flangedspring energised multi-platedisk brake and motor, in amanlift system

Standard steel ring ofa Double Row SlewDrive WD-L 0419,optimized for a highcapacity, short cycleapplication

Drives are easily modified to meetspecial operating conditions.

Modified worm gearof the WD-L 0419made of bronze forapplications withextended duty cycle

The subsystem consistsof a WD-L special designwhich is bolted to a baseplate for a paver stonelaying machine turningdevice

Frameless worm gear withintegrated Slewing Ringsuitable for extreme hightemperatures for a forkliftrotator (IMO is providingthe worm gear and thecustomer is assemblingthem in its own housing)

Worm shaft withappropriate worm gear(WD-L 0419)

WD-L 0343 with theattached potentiometer, usedin manlift systems

14

Our WD-H family - which model do you need?

WD-H series comprises 6 standard sizes

WD-H 0146

WD-H 0220

WD-H 0300

WD-H 0373

WD-H 0490

WD-H 0645

The WD-H series is unique on the market!Our design solution is protected by international patents,allowing IMO to offer the unique combination of high torqueand tilting moment capacities in the industries smallest footprints.

Standard units easily adaptableto meet specific applications(i.e: WD-H 0300)

WD

-H S

lew

Dri

ves

Overv

iew

Basic version WD-H 0300without motor

Version with single motor

Version with twin motors(double torque capacity)available from size WD-H 0300and above

Version with twin motorsand additional brakes(mounted betweenmotors and housing)

Version with twin motors andflanged feedback sensors(gearing potentiometer)

Best possible application solution to meet ourcustomers design requirements

WD-HE 0373 with twin three phaseelectrical motors and spur gearboxes

WD-HC 0373 bronze worm gear forincreased operating life expectancy(amusement park ride)

WD-HC 0220 with integralclutch to protect unit fromoverloading (for a rock drill rig)

WD-HC 0300 with special housing(seamless rolled, quenched andtempered steel) and a special designedworm gear pair for a higher capacityload

15

16

SP S

eri

es

Sle

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rives

Overv

iew

SP-Slew Drives with totally enclosed housing.Standard Slewing Ring mounting hole patterns provide full product interchangeability.

Overview

SP-M

SP-H

SP-L

SP-I

mounting hole patterns identical to IMO Ball Slewing Ring series 125 height increased by base plate thickness of 0.591 in ball diameter 1 in module 8 mmone or multistage planetary gearbox

SP-H, heavy series

mounting hole patterns identical to IMO Ball Slewing Ring series 120 height increased by base plate thickness of 0.591 in ball diameter 0.787 in module 6 mmone or multistage planetary gearbox

SP-M, medium series

mounting hole patterns and height identicalto IMO Ball Slewing Ring series 120 ball diameter 0.787 in module 4 mmdirect drive

SP-I, intermediate series

mounting hole patterns and height identicalto IMO Ball Slewing Ring series 920 ball diameter 0.787 in module 4 mmdirect drive

SP-L, light series

17

Examples of customer initiated special designs

SP-L series Slew Drive with electrical motor andspur gearbox for handling equipment.

SP-LE 0841

SP-H series Slew Drive with two motor modules(hydraulic motor/planetary gearbox) for a ship rescuecrane.

SP-HC 0755

Custom design with a feedback potentiometer as well asa planetary gearbox. Application is a rotation device fora special excavator attachment.

SP-HC 0655

Ap

pli

cati

on

sSte

eri

ng

Gears

Fo

r Sp

eci

al

Veh

icle

s

18 19

Heavy load transporters presentbig technical challenges. Each singleaxle is steered by an IMO Slew Driverequiring the maximum axial, radialand tilting moment capacity.The WD-H 0300 with steering torquesof 19,900 ft-lbs is an excellent solution.

Ap

pli

cati

on

sSm

art

Ste

eri

ng

So

luti

on

s

Straddle carrier with eight independentlysteered axles.

Side loader with the steeringgears of the WD-L 0223 andWD-L 0419 series; the highoperating time requires the useof bronze worm gears.

The combination of IMOsteering gears with additionalhydraulic, electrical andelectromechanical componentsand the system integration intothe vehicle enables an effectivesolution, including “steeringby wire”.

We stand ready to work closelywith an experienced designteam to provide the optimumSlew Drive solution.

Unlike typical hydraulic pushrod actuated steering solutionsIMO Slew Drives offer 360degree steering capability.

20

Undercarriage of a harbor mobile crane withWD-HC 0300 steering gears; In combinationwith the hydraulic motor, the gearpotentiometer indicates the position of thewheel.

Ap

pli

cati

on

sSte

eri

ng

Gears

Fo

r U

nd

erc

arr

iag

es

With the capacity to handle extreme tilting moments, high outputtorques, all in a compact design, the IMO WD-H Slew Drives areespecially suited as steering devices.

In addition, integrated position feedback sensors support computercontrolled steering systems.

Using IMO Slew Drives, cranes and special vehicles achieve uniquemaneuvring capabilities including turning on the spot.

21

Ship lifting device to lift and placeships up to a weight of 1,433,000 lbs.

Eight Slew Drives of the WD-HCseries carry this load capacity.

In concrete factories, large movablegantry cranes displace heavy andbulky prefabricated concrete. Withthe Slew Drive WD-HC 0645, each

axle can be turned individually.The steering torque required at themaximum load while turning on the

spot is about 110,600 ft-lbs.

22

The high capacity and lowprofile of the WD-L series areperfectly suited for manliftplatforms.

The wide varity of sizes in thisseries enables their use inmany different kinds ofplatforms (heights rangingbetween 23 - 89 ft).Design standardisation“at its best”!

Small manlift on a crawler chassis witha WD-L 0223 Slew Drive.

This bridge inspection equipmentuses Slew Drive WD-HC 0300in the boom joint. The unit isable to accomodate thesuspended loads and isfitted with a wormdrive and multi-platedisk brake.

Telescopic working platformwith a WD-L 0419 Slew Drive.

Ap

pli

cati

on

sM

an

lift

Pla

tfo

rms

This working platform with aheight of 115 ft uses two IMO

Slewing Rings on a synchronousrotating turntable which are

driven by an IMO WD-HC 0146Slew Drive.

Combining low unit weight andhigh capacity, the Single and DoubleRow Slew Drives of the seriesWD-L 0223 perfectly match basketrotator requirements of largemanlift systems.

23

24

This functional but eleganttwin worm Slew Drive WD-H 0645,

is ideally suited for the slewinggear of a yacht crane.

The IMO Slew Drive,model WD-L 0478 is used

for railway slewingcranes used to position

track sections.

Light cranes - the standard equipmentof service trucks, using the IMOWD-L 0343 Slew Drive(also available with special flanges).

Ap

pli

cati

on

sC

ran

es

The special series SP-IC 0841 with two directhydraulic motors was developed for thisspecial crane, used for roof top operations.

25

27

Co

nst

ruct

ion

Mach

inery

Ap

pli

cati

on

s

To protect the teeth of this demolitionequipment from overload damages, afriction coupling is integrated in the spurgear driven Slew Drive SP-OP 0580(OP= “overload protected”).

26

Cement mixer equipped with a conveyorbelt with a length of 54 ft, which is rotatedwith two WD-LC 0419; the considerablelength of the belt leads to high tiltingmoments. Therefore a double row designwith a reinforced housing is used.

This rotation and tilting device of afront loader uses an IMO SlewDrive, model WD-LC 0419 with twinmotors (double the torque).

Cemetery excavator with the IMO Slew Drive WD-L 0343.

28

Working in aggressiveenvironmental conditions, the

Slew Drive WD-HC 0373 isadapted for the use by a cranein a salt mine. Brakes ensure

position holding at extremecrane decline.

Ap

pli

cati

on

sM

inin

g a

nd

Tu

nn

ell

ing

Instead of a traditional largediameter toothed Slewing Ring,this manipulator uses a compactSlew Drive WD-HC 0373 with twinworm and locking brakes.

To ensure that the blasthole boring toolremains locked in place during the boringprocess, the WD-HC 0220 shown has anintegrated locking system with a positionholding device.

Slew Drive SP-HC 0698 withhydraulic motors and gearboxes for turning anexcavator boom, part of acutter bar of a tunnel boringmachine.

29

SP-Slew Drives are used inautomation systems. Picture: SlewDrive SP-LE 0641 with three-phaseelectrical motor and spur gearbox.

This is a facility to cover car facia panels withleather. It contains Slew Drive WD-HC 0300.Because of its operating condition, it is fittedwith a spring energised multi-plate disk brake.

Manipulator for turning concreteparts with Slew Drive WD-HE 0373.

30 31

Bank mower with Slew DriveWD-L 0419, double row series.

Ap

pli

cati

on

sPo

siti

on

ing

/ A

uto

mati

on

Slew Drives of WD-series fitted withelectric motors used for the yaw and

pitch controls of this solar table.

32

Bh

Cax

Crad

C0 ax

C0 rad

DL

EDB

EDB ’

EDmax ’

fa

fMd

Fax

FaxD

Frad

Frad max

Fsp

Gw

i

m

MA

Md B

Md nom

Md max

Mh

Technical Information

Basic rating life in operating hours

Basic axial dynamic load rating

Basic radial dynamic load rating

Basic axial static load rating

Basic radial static load rating

Raceway diameter(see Product Overview P. 4/5)

Duty

Duty per minute

Maximum permissible duty of rotation per minute(see diagram series description)

Application service factor

Ratio of operating torque to maximum torque

Equivalent axial load including all occurring shockloads and required safety factors, calculated fromall axial forces

Equivalent axial load including application servicefactor for determining the load point in the limitingload diagram

Equivalent radial load including all occurring shockloads and required safety factors, calculated fromall radial forces; the effective gearingcircumferential force has to be considered

Limit value for checking frictional contact

Initial preload on bolt

Limit value

Gear ratio

Module

Tightening torque for mounting bolts

Operating torque

Nominal torque

Maximum torque

Maximum holding torque

Symbols and units

h

lbs

lbs

lbs

lbs

in

%

%/min

%/min

—

—

lbs

lbs

lbs

lbs

lbs

h

—

mm

ft-lbs

ft-lbs

ft-lbs

ft-lbs

ft-lbs

Mk

MkD

MW

MWA

n

nperm

nb

SF1

SFS 1

SFS 1.75

Sw

Q

z1

z2

αA

∆p

δk

δk perm

δp

δv

δw

Equivalent tilting moment including all occurringimpact loads and required safety factors,calculated from all axial and radial forces thatcause the tilting effect

Equivalent tilting moment including radial loadand application service factor for determiningthe load point in the limiting load diagram

Friction torque of the Slew Drive under operatingload in the installed state

Friction torque of the Slew Drive, unloaded

Operating speed of Slewing Ring

Permissible operating speed of Slewing Ring

Number of fastening holes per bearing ring

Series SP: Safety factor against tooth base fatigueSeries WD: Safety factor against tooth wear

Series WD: Safety factor against tooth fracture

Series SP: Safety factor against static tooth basefracture

Calculation safety factor 1.3 for wear diagram

Oil flow

Number of teeth, pinion

Number of teeth, Slewing Ring

Bolt tightening factor

Pressure differential

Tilting clearance increase

Maximum permissible tilting clearance increase

Maximum permissible flatness deviation

Maximum permissible deformation of mountingstructure

Maximum permissible perpendicularity deviation

ft-lbs

ft-lbs

ft-lbs

ft-lbs

rpm

rpm

—

—

—

—

—

—

—

—

psi

in

in

in

in

in

gal(US)/min

33

General

Function of Slew Drive

Slew drives comprise a highly robust Slewing Ring provided withgear teeth (1), one or several toothed drive elements (2), a wormgear in this case, seal (3), housing (4) and a hydraulic or an electricdrive (5). Slew Drives are designed for grease lubrication.

In a Slew Drive the rolling elements (6) carry the load between theinner ring (7) and outer ring (8). The raceway system’s capacity isdetermined predominantly by Slewing Ring design, the depth ofhardening and the number and size of the rolling elements. Spacers(9) separate the rolling elements and minimise friction and wear.

Fax

Frad

MK

Load distributionDepending on external load, the load distribution contact and theangle around the rolling elements will vary.

In the case of axial load, all rolling elements are loaded in the samedirection.In the case of radial load, a segment of the rolling elementscarries the load.In the case of tilting moment load, a segment on one side and asegment on the opposite side carry the load.Mostly, a combination of axial, radial and tilting moment loadsoccur.

•

•

•

•

1

9

6

2

4

3

5

7

8

35

TorqueThe operating torque may not exceed the maximum torque specifiedin the Technical Data section, calculated with application servicefactor 1. Explanations of different torque specifications are as follows:

Series SP:

Maximum torque Md max:Slew Drive series SP-H, SP-M:Maximum torque is limited by maximum radial load ofthe planetary gear-set used.

Slew Drive series SP-L, SP-I:The maximum torque is calculated with a safety factoragainst static tooth base fracture SFS 1.75.

Nominal torque Md nom:The nominal torque is calculated with a safety factoragainst tooth base fatigue SF1, at the rotational outputspeed specified in the Technical Data section, under one-way varying load.

DutySlew Drive series WDs are designed for intermittent duty. Applicationwith continuous running or with higher rate of duty andsimultaneously high output torque are not permissible.This would lead to unacceptable temperature increase in the gearingand thus to premature failure of the Slew Drive.Transmission of the maximum torque is to be limited to 10% ofeach minute. Please check the diagram for the maximum permissibleduty per minute of the respective series on P. 53 and P. 63.

Static capacity of raceway

Static capacity of the Slew Drive is determined by:

• Hardening depth of the raceway• Number and size of the rolling elements• Slewing Ring design• Raceway geometry

The limiting load diagram shows permissible axial and tilting momentloads for a respective size unit.

Every loading case including the required or recommended safetymust lie below the limiting load line.Series WD:

Maximum torque Md max:The calculation of the maximum torque with a safetyfactor against tooth fracture SFS 1 is done according toG. Niemann / H. Winter, Machine Elements, Band III, 1986,for worm gears and is influenced by:• Limiting value of tooth base stress• Module• Gearing width

Nominal torque Md nom:The nominal torque is calculated with a safety factoragainst tooth wear of SF1,• at the output speed specified in the table• for a calculated service life of 10,000 h• at a duty of 5%For Slew Drives with two motors, the specified values arevalid for a slewing angle of ≤ 170°.

Series SP and WD:

Maximum holding torque Mh:The maximum holding torque determines which retroactivetorque can be transmitted or held without damage beingcaused to the gearing. In general, the value of themaximum torque is assumed.

Rotational speedSlew Drive series SP:The maximum permissible speed is

Slew Drive series WD:The maximum permissible speed is specified in the Technical Datasection. For higher speeds, our Engineering Department shouldbe consulted.

Limiting load diagrams are valid under the following condition:

Static loadingLimiting load line with safety 1Clamping length of bolts, minimum 5-times, maximum10-times the bolt diameterContinuous threads up to the bolt head is not permissibleBolts of quality class SAE Grade 8 for series WD-LA and qualityclass 10.9 according to DIN EN ISO 898 for the other seriesAll mounting holes used“Compressive” loadAdequately stiff and level mounting structure (see chapter“Installation and Maintenance Instructions” on P. 46 - 51)Minimum strength of the mounting structure 72,520 lbs/in2

Radial loading considered as specifiedCompliance with “Installation and Maintenance Instructions“

•••

••

•••

•••

Fax

Frad

MK1570

DLnperm =

34

Technical Information

Radial loads must be transmitted by means of frictional contactbetween Slew Drive and the attached structure.

A good bolt connection is vital for satisfactory function of theSlew Drive. Bolt connection and tilting clearance of a Slew Drivemust be checked regularly.

•

•

Fax

Fax

Axial loads can be “compressive“ or “suspended”.

A “suspended” axial load and the load on a rising segment intilting moments must be adequately resisted by mounting bolts.

•

•

Fax

Fax

GearSlew Drives of series WD are designed with worm gear.Slew Drives of series SP are designed with spur gear. Permissibletorque is specified in the Technical Information section.

DriveDrive is provided by either an attached hydraulic or electric motor.Both motor mountings as well as the shaft/hub connection conformto industrial standards, hence hydraulic motors available on themarket can be mounted without difficulty.For electric motors, corresponding adapter pieces are necessary. Thedesign specification for drive motors is undertaken by IMO, basedupon rotational speed and torque information provided by thecustomer.

HousingHousing is designed as a welded or cast component and adaptedto the size of the Slew Drive. As a standard feature, housings aresupplied with a priming paint.

All catalog bolt data is valid only for “compressive” loads!

SealingPolymer seals protect the Slew Drive from normal dirt penetration,dust and light sprayed water. For very dirty and wet environments,the seals shall be protected with pre-mounted labyrinth seals on themounting structure.Performance and reliability of a Slew Drive depend strongly onavoiding ingress of contaminents to the interior of the unit.

Pressure washing must not be used to clean Slew Drives.

Operating temperatureStandard version IMO Slew Drives can be used in ambienttemperatures from –4°F up to +158°F.

Selection criteria

The following criteria must be considered for the correct selectionof a Slew Drive.

Position of the output shaftVertical: Slew Drives of all series can be used

(even with a self-locking gear).

Horizontal:

Alternating:

Slew Drives of all series can be used with exception ofseries WD-H. Here, it is necessary to use a Slew Drivewith a 2-start gear, since using gear with self-lockingand external driving force does not ensure smooth (jerkfree) operation.

Slew Drives provided with self-locking gear cannot beused. Using a Slew Drive of series WD-H with 1-startgear without self-locking is possible only up to 10°inclination angle to the vertical, otherwise smoothoperation cannot be guaranteed.

Slew Drives that are not self-locking can, as an option, be equippedwith a locking brake, if required (see optional attachments for details).

Caution: Catalog bolt data is not valid in this case!

“Compressive” loads

“Suspended” loads

LoadsExternal forces such as axial load, radial load and tilting momentmust lie below the static limiting load curve, as regards their operatingload point. For this, please refer to the chapters “Static capacity ofraceway“ and “Mounting bolts”.

Shocks, vibrationsTo account for the peculiarities of different applications, the shockfactors for gears should be considered. Slew Drives of the series WDare not suitable for applications under permanent vibration.

Back loadKeep in mind that in the case of series WD Slew Drives, due to thehigh gear ratio, that in the case of back load (e.g. caused by boomimpacting on obstacle), there is danger of irreparable damage tothe worm gearbox, so long as the driving torque exceeds themaximum permissible table values Md max.

36

Technical Information

Application

Construction machinery

Forestry machinery

Foundries

Manlift platforms

Mech. engineering, general

Mech. engineering, general

Measuring technique

Robot / mech. handling sys.

Rail vehicles

Special vehicles

Deep mining

Machine tools

Application service factor fa

1.25

1.50

1.75

1.30

1.25

1.50

2.00

1.50

1.50

1.50

1.75

1.50

Remark

Normal operation

Rough operation

Rough operation

Normal operation

Normal operation

Heavy operation

Accuracy

Accuracy

Rough operation

Rough operation

Rough operation

Accuracy

To address the peculiarities of different applications, the followingapplication service factors are to be considered in the prevailingloads:

Application service factors are to be considered in the followingequations for the prevailing loads:

Slew Drive: pre-selected SP-M 0741/2-05894

The following values are achieved with an application servicefactor of 1.25:

FaxD = Fax • fa

To account for the prevailing radial load, the tilting moment isincreased accordingly.

This equation applies only if:

Should the value be exceeded, the limiting load diagram no longerapplies.Please contact our Engineering Department.

Calculation example:

Application:

Load:

Slewing equipment for a constructionmachine under normal operation

Axial loadRadial loadTilting moment load

lbslbsft-lbs

FaxD = 12,400 • 1.25 = 15,500 lbs

At this point it can be verified in the limiting load diagram, whetheror not the pre-selected Slew Drive is statically adequate.

If the operating load point lies below the limiting load line then theSlew Drive is statically adequately dimensioned. If loads frequentlyoccur during the slewing process, the selected type should bereevaluated dynamically for lifespan. For this, please contact ourEngineering Department.

Mounting bolts

Prevailing loads must be safely transmitted. To ensure this, mountingbolts should be sized to handle the raceway loading.The bolt curve is depicted in the static limiting load diagram, subjectto the following conditions:

Caution: In the case of “suspended” loads, the bolts are subject toadditional tensional forces.Please contact our Engineering Department.

Static load carrying capacity of mounting bolts

Determining the operation load level, both with and without radialload, occurs along with the verification of the static load carryingcapacity of the raceway.

If the prevailing load case lies below the limiting load line in thestatic limiting load diagram then the bolt connection is staticallyadequately dimensioned.

•

•

•

Limiting load diagramSP-M 0741/2-05894

Quote the fulfillment of the conditions in the case of consideringthe static load Slew Drive capacity of the raceway.Bolts are appropriately tightened with a torque wrench(bolt tightening factor αA = 1.6). For tightening torques, see tableP. 48For Slew Drives with through holes, use the largest possible metricbolts with regular threads.

MkD = (Mk + 0.1442 • Frad • DL) • fa

Frad ≤ 0.0671 • Mk + 0.5 • Fax

12,4001,400

64,000

MkD = (64,000 + 0.1442 • 1,400 • 29.173) • 1.25= 87,362 ft-lbs

Equi

valen

t tilti

ng m

omen

t [ft-

lbs x

1,0

00]

Equivalent axial load [lbs x 1,000]

140

120

100

80

60

40

20

040 80 120 160 200 2400 280

Permissible zone

Limit load line

Unpermissible zone

Operating load point

37

Friction torqueThe friction torque in Slew Drives depends upon many influencefactors, e.g.:• Rigidity and flatness of the mounting structure• Load and loading combination• Rotational speed and operating temperature• Design of Slew Drive• Number and frictional torque of seals• Lubrication grease and level of filling• Manufacturing tolerances• Other factors

The friction torque of an unloaded Slew Drive can be determinedapproximately with the following equations:

Slew Drive series SP, with minimum Slew Drive clearance greaterthan zero

MwA = 0.0476 • DL2

Slew Drive series WD-L, with preloaded Slew Drive

Slew Drive series WD-H, with preloaded Slew Drive

Dynamic load Slew Drive capacity of mounting bolts

Mostly, static dimensioning of a mounting bolt is sufficient.In cases where very high numbers of stress reversals act on the SlewDrive, dynamic verification is necessary. For this, please contact ourEngineering Department.

Pressure lock of mounting bolts

When radial loads act on the Slew Drive, it must be ensured thatthese loads can be transmitted without shearing forces occurringinside the bolts. Therefore, it must be determined whether theradial load can be transmitted via frictional contact between themounting structure and the Slew Drive.

nb = number of fixing holes per ringFsp = pre-stressing force on a mounting bolt

If the prevailing radial load exceeds the limit value, we request thatyou contact our Engineering Department.

Frad max =nb • Fsp

18.8

For Slew Drives with a different number or size of bolts in the innerand outer ring, the permissible radial load is to be determined forboth rings. The smaller value is the limiting value.Frictional contact prevails if Frad max is greater than the prevailingradial load.

Slew Drives, series WD-H, are basically to be centralized.

Securing the mounting bolts

When a customer desires that the mounting bolts be secured, werecommend the following products (manufacturer specification isvalid):

Loctite®

Application of Loctite 270 is suitable for the highest level ofconnections. This prevents loosening and the threads are also sealed.

Nord lock®

Nord lock, self-locking washers, are recommended for cases ofvibration or dynamic loading cycles. Due to a pair of square taperedwashers with tapered surface gradients between both Nord-locksecuring washers greater than the gradient of the bolt threads, anyloosening tendency of the bolt is immediately prevented.

Other bolt securing systems are not recommended.

The friction torque for a Slew Drive under load can be determinedwith the following equation, approximately:

Mw = 0.000417 • (52.8 • Mk + 4 • DL • Frad + DL • Fax) + MwA

Gear

Slew Drive series SP

Type of gear

Slew Drives series SP are provided with spur gear according toDIN 3960, DIN 3962 and DIN 3967.If higher torque is necessary or longer operating lifespan is required,it is possible to manufacture the gear in tempered or hardened form.

Permissible torqueCorresponding data is available in the Technical Information section.

Drive pinionThe pinions used in different sizes are provided with hardened gear.In the Technical Data section you will find data about transmissionratios and numbers of teeth.For the direct drive (SP-L, SP-I), the drive pinion is equipped with aradial bearing that is integrated in the motor flange.In the case of Slew Drives equipped with planetary transmission, thedrive pinion is mounted via the planetary transmission.

MwA = 0.476 • DL2

MwA = 0.952 • DL2

38

Technical Information

LifespanThe expected lifespan of the gear depends on the operating conditions.The following factors are key:• Torque• Output speed• Duty factor• Ambient temperature, etc.

Lubrication

To ensure flawless operation and long usable life, adequate andregular lubrication is necessary. The grease fulfills the followingfunctions:

For the raceway:

• Reduction of friction and wear in the rolling contacts• Corrosion protection• Lubrication of seals• Additional sealing effect of the grease “collar”

For the gears:• Smooth running• Less wear• Reduced operation noise• Longer operating life• Less heat development

Initial greasing

IMO Slew Drives are supplied pre-lubricated. High-quality lithium-complex grease, based on mineral oil, with EP-additives accordingto DIN 51825, KP2P-20 is the standard lubrication.

Regreasing intervalsRegreasing must be done at regular intervals, depending on frequencyof use and ambient operating conditions. General attention mustbe paid to ensure that the grease used during the greasing iscompatible with the sealing material. Special attention should bepaid to ensure that lubricating grease types originally specified areused throughout the life of the unit.Should you wish to use other types of grease, it must be verifiedwhether the grease is compatible with that used for initial greasing.Please contact your grease manufacturer.Please observe also the data in the “Installation and MaintenanceInstructions” chapter.Beside regular regreasing during operation, it is also necessary togrease the Slew Drive after long standstill periods. Equally importantis to grease the equipment in which the Slew Drive is integratedafter cleaning.

Tooth backlashTooth backlash is factory-set at the highest point of the gear. Itdepends on the module of the gear and is calculated according tothe following formula:

Tooth backlash to be set = 0.00118 to 0.00157 • module

Slew Drive series WD

Design of the gearSlew Drive series WD is designed with a hardened worm gearaccording to DIN 3960, DIN 3962 and DIN 3967,

Permissible torqueCorresponding data is provided in the published Technical Informationsection.

Worm shaftWorm shafts are made of hardened steel, with ground tooth flanks.

Tooth backlashThe tooth backlash is set at approx. 0.0118 in for Slew Driveseries WD.

Self-locking

Series SP Slew Drives

Series SP Slew Drives are not self-locking.

Series WD Slew Drives

Self-locking only exists in the case of series WD Slew Drives if itcannot be driven from the output side. Self-locking is directly relatedto the efficiency of the Slew Drive, which depends on very manyfactors, e.g.

• Lead angle• Angle of friction• Rotation speed• Lubrication• Material matching• Surface finish, etc.

Theory indicates self-locking occurs if the gear efficiency is < 50%.Data in the Technical Data section conforms to this statement.However, it is vital to determine the actual existence of the self-locking characteristics in the supplied Slew Drive individually duringactual usage.We take no responsibility for conformity of the theoretical data inthe Technical Data section with the practically prevailing self-lockingor non-self-locking characteristics.

Shock coefficientAs for the applications in which impact is expected, the appropriateimpact coefficients must be considered when determining the SlewDrives’ maximum torque rating.

39

ATTENTION:Slew Drives must not be cleaned with pressure washingequipment. During pressure washing, large amounts ofpressurized water can penetrate into the Slew Drive throughthe sealing gap and cannot be removed, even by massive re-greasing. This will strongly reduce the usable lifespan of aSlew Drive.

Mixing greasesGrease with different thickener and base oil should generally notbe mixed. The manufacturer should always confirm if different greasetypes can be mixed.

Shelf life of lubricantsLubricants are subject to ageing even if unused. If after 3 yearsgrease is not yet used, it should be replaced.

Design of mounting structure

Safe transmission of application loads and reliable operation of SlewDrives is achieved, along with other factors, through using adequatelydesigned mounting structures.To ensure safe operation of Slew Drives, there are certain minimumrequirements to the mounting structure.

• Sufficient rigidity (see “Installation and Maintenance Instructions”)• Maintain flatness according to “Installation and Maintenance Instructions“• No hard points (e.g. through cross beams)• Surfaces for bolts must be machined plane• Hollow mounting structure is preferred• Use all mounting bolts• Bolts of recommended strength should be used• Minimum strength of attached structure 72,520 lbs/in2

Very different mounting structure solutions can be used, dependingupon maximum load and application.If hollow mounting structure is designated for attached structure,flange thickness should be at least 50 % of Slew Drive’s overallheight. The thickness of the hollow mounting structure should beabout 30% of flange thickness. For weight-critical applications,flange thickness can only be reduced if appropriate stiffening ribsare provided and the specifications on permissible flatness andperpendicularity deviations and deformation under load are upheld.Values on this are specified in the“Installation and Maintenance Instructions“ P. 46 - 51.

A few simple steps for selecting a Slew Drive

Worm gear driven typeWD Series

Spur gear driven typeSP Series

Position of the output shaft 1)

vertical horizontal alternating

Inclination angle to the vertical

≤ 10 Degrees > 10 Degrees

WD-Lor

WD-H withoutself-locking

gearing

WD-Lor

WD-H with2-startgearing

WD-Lor

WD-H

WD-Lor

WD-H with2-start

gearing

START

You will find a detailed procedure on the following pages!

Output rotation speed 1)

n ≤ 1570/DL [rpm]

n ≤ 1 rpm (WD-L/WD-H 0490,0645)

n ≤ 2 rpm (WD-H 0300,0373)

n ≤ 3 rpm (WD-H 0146,0220)

Application without continuousvibrations and without strong

impact loading

without restrictions

Condition fulfilled

Duty per minute EDB ‘ 1)

without restrictions

EDB ‘ ≤ 80 %/min

40

Conditionnot fulfilled

Conditionfulfilled

Verifying the wearcharacteristic of the wormgear 1)2)

SP-I 0229/3-04516SP-I 0411/1-03977SP-I 0541/1-03978SP-I 0641/1-039794

1

2

3

Selecting a Slew Drive using thelimiting load diagram 1)2)

Operating point must lie below theselected curve.

Selecting Slew Drive withlarger maximum torque

Md max

Selecting Slew Drive witha larger maximum torque

Md max

Conditionnot fulfilled

Conditionfulfilled

Verifying the maximumpermissible duty per minute

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00

102030405060708090

f Md

EDm

ax ‘ [

% /

min

]

Diagram 2

Condition not fulfilled

Condition fulfilled

Condition not fulfilled

Condition fulfilled

Static verification of thegearing Md B ≤ Md max

Verifying the selectedSlew Drive by IMO

Engineering Department

Please fill out an ApplicationData Sheet and supply asketch of the application.

Check the tooth basefatigue strength 1)2)

Conditionnot fulfilled

Conditionfulfilled

EDB100

Gw ≥ Bh •

EDB100

Gw ≥ Bh •

Selection criteria can be used only as rough typical values;if limit value is exceeded, please contact IMO.Please accurately consider operating conditions.

1)

2)

Md B ≤ Md nom

Md B > Md nom

EDB ‘ ≤ EDmax ‘

SOLUTION

41

1,000 100,000100

1,000

10,000

Limit

valu

e G w

[h]

7

10,000

Operating torque Md B [ft-lbs]

1

2

3

4

5

6

WD-LA 0223/3-06370WD-LA 0223/3-06630WD-LA 0343/3-06371WD-LA 0419/3-06372WD-LA 0419/3-06631WD-LA 0478/3-06373WD-LA 0625/3-06374

4

5

6

1

2

3

7

1250 25 50 75 100 150 175 200 225 2500

15

30

45

60

75

90

4

3

2

1Equi

valen

t tilti

ng m

omen

t [ft-

lbs x

1,0

00]

Equivalent axial load [lbs x 1,000]

2,55

3 2,9

39

3,72

7

4,35

1

SP-I 02

29/3-

0451

6

SP-I 04

11/1-

0397

7

SP-I 05

41/1-

0397

8

SP-I 06

41/1-

0397

90

1,000max

. tor

que

Md

max

[ft-l

bs]

2,000

3,000

4,000

SP-I 0229/3-04516SP-I 0411/1-03977SP-I 0541/1-03978SP-I 0641/1-039794

1

2

3

1,000100

500

1,000

10,000

2,000

3,000

5,000

Limit

valu

e Gw

[h]

10,0002,000 3,000 4,000 5,000 7,000Operation torque Md B [ft-lbs]

1

4

3

2

1

4

3

2

SP-I 0229/3-04516SP-I 0411/1-03977SP-I 0541/1-03978SP-I 0641/1-03979

42

Technical Information

Typical selection:Worm gear driven types have proven themselves as steeringgears. Features such as high torque, low output rotary speedwith smaller assembly height and diameter clearly speak for theapplication of WD design. The smallest assembly height of aworm gear driven Slew Drive is provided by the WD-LA series.

Enables higher output rotary speedsVery narrow in size around the Slewing Ring, but the drive isbroad in axial directionOffers a large, open internal diameterVery suitable for upper structures with larger radial diametersBasically not self-locking in designCan be equipped with locking brakesThe position of output shaft is insignificantPreferred design for vibration and impact loading applications

••

••••••

SP design:

Typical applications:Handling and automation equipment, packaging machines, toolchangers, grippers, construction machines, land and forestry machines,etc.

2. Step: Selecting a suitable design size in the limiting loaddiagram for “compressive” load:

A suitable Slew Drive is selected iteratively. For a pre-selected SlewDrive, (e.g. WD-LA 0478/3-06373), an operation load point iscalculated depending on external loading, the application servicefactor and the raceway diameter DL.Loading is permissible for raceway and bolt connection, providedthat the operating point lies below the limiting load line of a pre-selected Slew Drive.If the operation load point lies above the corresponding limiting loadline, a Slew Drive with higher power rating must be selected, forwhich the limiting load line lies above the current operation loadline. For the newly selected size, the operation load point must becalculated again and the permissibility of the new operation loadpoint must be verified against the limiting load line.On the contrary, if the operating load point also lies below the limitingload line of a smaller size, then, for this size, permissibility of thenewly calculated operating point can be verified within the limitingload diagram.This iterative approach is repeated until an optimally suitable size isdetermined, by which the operation load point lies below thecorresponding limiting load line.

The following conditions must be fulfilled:

Preconditions for limiting load diagram apply.•

Procedure for selecting a Slew Drive in only5 steps:

Pre-selecting a suitable Slew Drive is described using the followingexample:

Typical application:Manlift platforms, steering gears for undercarriages of cranes andheavy-duty vehicles, loading cranes, turntables, forklift rotators,mining equipment, etc.

Example:Application:

Load data:Axial load:Radial load:Tilting moment:Operating torque:Output speed:Operating time:Duty:

Rotation cycle description under operating torque:60° rotation in 10 seconds in clockwise direction60° rotation in 10 seconds in counter-clockwise directionPause for 40 secondsOperation of Slew Drive per minute:20 seconds rotating – 40 seconds standing still 0.333 minute, rotating per minute Duty per minute:

FaxFradMkMd BnBhEDB

Steering gears for an in-house transport vehicle;rough operation; limited assembly space;“compressive” load.

= 22,500 lbs= 7,800 lbs= 55,000 ft-lbs= 9,700 ft-lbs= 1.0 rpm= 14,000 h= 5 %

1. Step: Selecting a suitable design (WD or SP)

Comparing product characteristics

•

•••

•••

•

WD design:

Exhibits high torque at low output speeds and transmits hightilting moments, axial and radial loadsAttains highest capacity with smallest diameter configurationFlat design, due to tangentially located drivesProvides high torque transmission (however, the duty must betaken into consideration)Self-locking and non-self-locking Slew Drives are availableNon-self-locking Slew Drives can be equipped with locking brakesConsider the position of the output shaft when selecting the SlewDriveNot recommended in case of continuous vibrations and heavyimpact loading

EDB ´ = • 100% =33.3%min.

0.333min.

• Frad ≤ 0.0671 • Mk + 0.5 • FaxEquation fulfilled0 100 200 300 400 500

0

40

80

120

160

200

240

280

6

2

3

7

WD-LA 0223/3-06370WD-LA 0223/3-06630WD-LA 0343/3-06371WD-LA 0419/3-06372WD-LA 0419/3-06631WD-LA 0478/3-06373WD-LA 0625/3-06374

4

5

6

1

2

3

7

5

4

43

Example:••

Preconditions for the limiting load diagram applyVerifying the operating parameters:

(condition fulfilled)

Calculation of the operation load point:Application service factor fa = 1.5 (special vehicles)Raceway diameter for WD-LA 0478/3-06373: DL = 18.819 in (see product program overview / compare P. 4 and P. 5)

The operation load point lies below the limiting load line of the selected Slew Drive WD-LA 0478/3-06373 and is permissible.The operation load point of the selected Slew Drive lies above the limiting load line of the smaller size, which would not be permissible.A Slew Drive that is larger than the selected Slew Drive WD-LA 0478/3-06373 would not be the best solution from the economicpoint of view.

Operation load point ( FaxD ; MkD)

Frad ≤ 0.0671 • Mk + 0.5 • Fax

7,800 ≤ 0.0671 • 55,000 + 0.5 • 22,500 = 14,941

33.75

114.25

FaxD = Fax • fa

FaxD = 22,500 • 1.5 = 33,750 lbs

MkD = (Mk + 0.1442 • Frad • DL) • fa

MkD = (55,000 + 0.1442 • 7,800 • 18.819) • 1.5 = 114,250 ft-lbs

1

Equi

valen

t tilti

ng m

omen

t [ft-

lbs x

1,0

00]

Equivalent axial load [lbs x 1,000]

44

Technical Information

0

5,000

10,000

20,000

30,000

Maximum torque Md max of individual sizes

max

. tor

que

Md

max

[ft-l

bs]

31,5

85

6,86

1 9,51

8 11,5

10

11,5

10

17,9

13

6,86

1

WD-LA

0223/

3-0637

0

WD-LA

0223/

3-0663

0

WD-LA

0343/

3-0637

1

WD-LA

0419/

3-0637

2

WD-LA

0419/

3-0663

1

WD-LA

0478/

3-0637

3

WD-LA

0625/

3-0637

4

Slew Drives WD-LA 0419/3-06372, WD-LA 0419/3-06631, WD-LA 0478/3-06373 and WD-LA 0625/3-06374 can statically transmit theoperating torque Md B.Since the operation load points of series WD-LA 0419/3-06372 and WD-LA 0419/3-06631 lie above their limiting load lines (cf. Step 2),the size WD-LA 0478/3-06373 selected in Step 2 has to be selected. If the operating torque Md B is greater than 17,913 ft-lbs, thenWD-LA 0625/3-06374 must be selected; in this example, however, WD-LA 0625/3-06374 is not an economical solution.

Step 3: Static reliability verification of operationtorque Md B:

The following condition must be fulfilled:Operating torque Md B ≤ maximum torque Md max(see series overview WD-LA P. 52)

Example: 9,700 ft-lbs ≤ 17,913 ft-lbs (condition fulfilled)

9,700

Step 4: Verifying the maximum permissible duty per minute EDmax ’:

The following condition must be fulfilled:

Preconditions for the diagram of maximumpermissible duty per minute EDmax ’apply (see series overview WD-LA P. 53)

• Duty per minute EDB ’ ≤ maximal permissibleduty per minute EDmax ’(see series overview WD-LA P. 53)

1,000 100,000100

1,000

10,000

Limit

valu

e G w

[h]

10,000

WD-LA 0223/3-06370WD-LA 0223/3-06630WD-LA 0343/3-06371WD-LA 0419/3-06372WD-LA 0419/3-06631WD-LA 0478/3-06373WD-LA 0625/3-06374

4

5

6

1

2

3

7

7

1

2

3

4

6

Maximum permissible duty per minuteEDmax ’ = 46 % / minVerifying the condition: EDB ’ ≤ EDmax ‘33.3 % / min ≤ 46 % / min condition fulfilledDuty per minute is permissible.

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00

102030405060708090

f Md

EDm

ax ‘ [

% /

min

]

Example:

Pre-conditions for the diagram of maximum permissibleduty per minute EDmax ’ apply.

Verifying the condition: EDB ’ ≤ EDmax ‘

Duty per minute EDB ’ = 33.3 % / min

Determining the maximum permissible duty per minute(see series overview WD-LA P. 53)

•

Factor fMd = = = 0.5419,700 ft-lbs

17,913 ft-lbs

46 %/min

0.541

1. Suitability of design2. Load carrying capacity of raceway and bolt connection in the limiting load diagram3. Permissibility of the operating torque4. Maximum permissible duty per minute5. Wear characteristic of worm gearing was considered and the Slew Drive WD-LA 0478/3-06373 evaluated as applicable in all aspects.

Verification as regards:

Verification of the selected Slew Drive by IMO is recommended.Please enclose Application Data Sheet and a sketch of the application (see P. 108 and P. 109).

Step 5: Verifying wear characteristics of worm gear

The following condition must be fulfilled:

Preconditions for wear diagram apply(see series overview WD-LA P. 53)

• Limit value GW ≥ operation time Bh •

Limit value Gw = 1,500 hours (from diagram)

Bh • = 14,000 hours • = 700 hoursEDB100

5 %100

1,500 hours ≥ 700 hours condition fulfilled

Operation is permissible as regards wear characteristics.

Example:

Preconditions for wear diagram apply

Verifying the condition:

Determining the limit value GW at the operating torqueMd B from the diagram for the selected Slew DriveWD-LA 0478/3-06373 (see series overview WD-LA S. 53)

•

Verifying the condition:

Md BMd max

EDB100

Gw ≥ Bh •

EDB100

Gw ≥ Bh •

duty EDB100

1,500

45

Result:9,700

5

Operating torque Md B [ft-lbs]

δw

Cleaning material does not penetrate into the Slew Drive.Applicable provisions for cleaning media are observed(e.g. manufacturer provisions, protection of workers,environment protection).Cleaning material that attacks the sealing material is notused.

0. Transport, handling and storage provisions

0.1 Transport, handling and storage

Transport only in horizontal position. Impacts shall be avoided.

Wear work gloves when handling the Slew Drives.

Slew Drives are generally provided with threaded holes in which eyebolts can be fixed. This enables safe handling on a hoisting device.Please observe relevant legal regulations when doing this.

Store only in a horizontal position and in closed rooms. The surfacecorrosion protection holds for approx. 3 months in closed packaging.Longer storage periods require special protective measures.

If in doubt, please contact IMO.

1. Installation

1.1 Preparation for installation

1.1.1 Cleaning the Slew Drive and the mounting structure

1. Remove extraneous material from supporting surfaces (including paint residue, welding beads, burr formation).2. Clean corrosion protection coating from supporting surfaces of the Slew Drive.

1.1.2 Determining permissible flatness deviation δpperpendicularity deviation δw and the permissible deformationδv of the mounting surface of the supporting structure

Table 1: Permissible flatness including perpendicularity deviationsfor Slew Drives series WD-H

••

•

146

0.0024

220

0.0024

300

0.0028

373

0.0028

490

0.0032

645

0.0036

Table 2: Permissible flatness including perpendicularity deviationsfor Slew Drives series WD-L and all SP

100

0.0016

250

0.0024

500

0.0032

750

0.0036

1000

0.0040

1250

0.0044

Table 4: Permissible deformation of mounting structure undermaximum load for Slew Drive series WD-L and all SP

100

0.0052

250

0.0063

500

0.0083

750

0.0095

1000

0.0106

1250

0.0114

Raceway diameter [mm]

Deformation of mounting structureper supporting surface [in]

For Slew Drives between specified sizes, the closest smaller valueshall be taken. For Slew Drives larger than type 645, the value forsize 645 shall be used. For Slew Drives with a raceway diameterabove 49.213 in, the value for 49.213 in shall be used.

The size of Slew Drives (WD-H) or raceway diameter DL (WD-L, SP)can be found on our Drawings.

Table 3: Permissible deformation of mounting structure undermaximum load for Slew Drive series WD-H

146

0.0040

220

0.0044

300

0.0048

373

0.0052

490

0.0059

645

0.0063

Size of Slew Drive

Deformation of mountingstructure per support surface [in]

XX – X(X) XXXX / X – XXXXX

Size of Slew Drives (WD-H) [mm]Raceway diameter DL (WD-L/SP) [mm]

Permissible perpendicularity deviation δw (tilting) is based on theactual flange width and may only amount to one half of the valuesin Table 1 and 2.

The maximum residual value for flatness deviation δp (waviness)along the circumference may total to only once per 180 deg.The form must resemble a sine curve that gradually rises and falls.

In doing this, ensure that:

Applicable cleaning materials:Cold solvents (e.g. white spirit, diesel oil, Kaltryl KEV etc.)

Size of Slew Drive

Flatness including perpendicularitydeviation per supporting surface [in]

Raceway diameter [mm]

Flatness including perpendicularitydeviation per supporting surface [in]

Sketch: Permissible curve of flatness deviation of the mounting structure and flatness and perpendicularity deviations on the mounting structure

Perpendicularitydeviation δw

Flatness deviation

0

Flatn

ess d

eviat

ionδ P

Circumference

Permissible curve

Max. value

180 deg

δP

δP

δP

4746

Installation and Maintenance Instructions for Slew Drives (EW ST US Rev. 5.02)

Preface

The following instructions give you the information you need to beable to correctly install and maintain an IMO Slew Drive.

These instructions replace earlier versions for series SP and WD.All instructions are provided with a revision number. Installation andmaintenance instructions with previous revision numbers are invalid.The latest version is published on our homepage and can bedownloaded from there (www.goimo.com). Please always checkthat you are working with the latest revision!

These instructions shall be attached to your product or to the finalproduct or to the Installation and Maintenance Instructions. All worksteps listed here are to be executed by suitably qualified personnel.

Please do not hesitate to contact our Engineering Department forany further assistance.

Transport, handling and storage provisions

Transport, handling and storage

Installation

Preparation for installation

Cleaning the Slew Drive and the mounting

structure

Determining permissible deviations and/or

deformation of mounting structure

Lubricating or checking oil level

Choice of mounting bolts

Choice of tightening torques

Installing the Slew Drive

Positioning the Slew Drive

Securing the Slew Drive with bolts

Determining the existing tilting clearance

Operating test

Maintenance / safety checks and lubrication

Checking the mounting bolts

Checking the tilting clearance

Checking the rotational clearance of series WD

Relubrication or checking oil level

Relubrication intervals

Lubricants

Contents

0.

0.1

1.

1.1

1.1.1

1.1.2

1.1.3

1.1.4

1.1.5

1.2

1.2.1

1.2.2

1.2.3

1.2.4

2.

2.1

2.2

2.3

2.4

2.5

2.6

Non-compliance with Installation and MaintenanceInstructions.Failure to pass on content to third party.

Notice

The following text includes special notices and procedures thatshall be observed.Technical properties of Slew Drives are found in our product catalogor in the technical offer.

IMO accepts no liability for:

1.

2.

48

1.2 Installing the Slew Drive

1.2.1 Positioning the Slew Drive

1.2.2 Securing the Slew Drive with bolts

The Slew Drive shall be mounted in the unloaded condition. Firstthe housing or toothless bearing ring is attached and then the wormwheel or the gear bearing ring.

Determine the main load-carrying zone.For all Slew Drives except series WD-H, the soft spot of the bearingraceway shall be placed at a 90° point to the maximum load zone. The soft spot is designated with a filling plug or a punched “S”mark.With a gauge, check whether the supporting surface of the SlewDrive is fully supported by the mounting structure.

1.2.

3.

The following procedure shall be followed in order to avoiddeviations between bolt tightening forces.

Lightly lubricate bolt threads and head in order to ensure uniformfrictional resistance (does not apply to bolts with adhesive).Preload the bolts, including washers, if required, crosswise in3 steps - 30%, 80%, 100% of the tightening torque.Repeat the procedure for the worm wheel / bearing ring.

1.

2.

3.

1.2.3 Determining the existing tilting clearance

The tilting clearance increases with additional racewaywear. To determine the increase in tilting clearance, it isnecessary to take basic measurements after installationprior to putting the drive into operation for the first time.

Permanently designate the measuring point in the main loaddirection.Record all measured values.

•

•

1.1.3 Lubricating the Slew Drive or checking oil level

Slew Drives are supplied fully lubricated. They shall be greased againprior to initial operation. It is essential to use the grease specifiedon the delivery drawing. Suitable grease types for normal cases arelisted on Table 9.

Inject grease into the grease nipples one after the otherwhile rotating the drive until a bead of fresh grease formsat least on one sealing lip.For Slew Drives equipped with an intermediate deviceusing gears (For example: Planetary gear), the oil levelshould be checked and refilled if necessary. For this seeInstallation and Maintenance Instructions of theintermediate transmission manufacturer.

1.1.4 Choice of mounting bolts

Prescribed sizes, number and quality grades shall be used.

1.1.5 Choice of tightening torques

Mounting bolts are in normal cases adequately secured by correctpreloading.

Mounting bolts can be secured by Loctite. Nord-Lock bolt lockwashers may be necessary in case of shock loading or vibration.Use of split rings, split washers, etc. is not permissible.

•

•

Table 6: Tightening torques and initial preloads for mounting boltsaccording to DIN13

1/4-20 UNC

5/16-18 UNC

3/8-16 UNC

7/16-14 UNC

5/8-11 UNC

3/4-10 UNC

7/8-9 UNC

1.1/8-7 UNC

M6

M8

M10

M12

M16

M20

M24

M30

10.9

8.5

20.7

41.2

72

181

355

612

1225

10.9

3,080

5,665

9,037

13,151

24,954

38,892

55,997

89,474

Dimension

Tighteningtorque

MA1) in ft-lbsQuality class

1) MA according to VDI-guideline 2230 (February 2003) for µK= 0.08 and µG= 0.12

1.

2.

Grip ratio (grip length to diameter of bolt) shall be observed, fromminimum ≥5 to maximum ≤10.Bolts with a fully threaded shaft are not permissible.Slew Drive function, lifespan, and durability can be affected incase of non-compliance.When the permissible interfacial pressure is exceeded, use suitablewashers of appropriate size and strength.Do not reuse bolts, nuts and washers.

•

••

•

•

Table 5: Permissible interfacial pressure for different materials

Materials

St52 / C45N / 46Cr2N

42CrMo4V

Max. surface pressure in lbs/in2

60,916

101,526

Mountingbolt

Dimension

Mountingbolt

When applying a hydraulic fastening device, the tightening forcesfor preloading shall not exceed 90% of yield stress.

Installation and Maintenance Instructions for Slew Drives (EW ST US Rev. 5.02)

Procedure

Determine and mark the measuring point at the point of load,both on the housing as well as on the worm wheel or on the gearring.Fix the dial gauge – see sketch.Apply the defined tilting torque, minimum of 50% of the maximumoperational load in “A” direction.Set the dial gauge on zero.Apply the defined tilting torque, minimum of 50% of the maximumoperational load in “B” direction.The measured difference between “A” and “B” corresponds tothe tilting clearance and serves as the basis for comparison forlater inspections.

1.

2.3.

4.5.

6.

SAE Grade 8

8.6

18.0

32.3

52

159

285

461

981

SAE Grade 8

2,972

4,984

7,430

10,218

22,007

32,840

45,531

75,264

Initial preloadon boltFsp in lbs

Quality class

Tighteningtorque

MA1) in ft-lbsQuality class

Initial preloadon boltFsp in lbs

Quality class

49

All subsequent measurements are performed at the same measuringpoint, with the same loads, at the same position of the housingrelative to the worm wheel or gear ring and in the same sequence.All the measured values are to be recorded.For purely axial or radial loads, tilting clearance is inspected byapplying an additional tilting load.

•

••

1.2.4 Operating test

If the mounting bolts are properly tightened and the drive motor iscorrectly connected, then the Slew Drive shall rotate uniformly.Deviations of the mounting structure and the effect of extraneousloads can strongly impact the friction torque.

Rotate mounted Slew Drive several times.Check whether Slew Drive runs smoothly without jumping.Perform further test runs under full load.

1.2.3.

After operating test, recheck the tightening torques of mountingbolts.

2. Maintenance / safety checks and lubrication

2.1 Checking mounting bolts

To compensate for possible settling, it is necessary toretighten the bolts to the prescribed torque. This shall bedone without externally loading the bolts after the first100 hours in operating. This inspection shall be repeatedafter every 700 hours in operation.The inspection period may be reduced under specialoperating conditions. In case of loose bolts, replace all bolts,nuts and washers with new ones.

Tilting clearance measurement

Main load direction

Tilti

ng m

otio

n

0

„A”

„B”

51

2.5 Relubrication intervals

Relubrication intervals depend mainly on the prevailingwork and environmental conditions as well as on the versionof the Slew Drive.Exact relubrication intervals can only be determined by testsunder actual operating conditions.Intermediate transmissions are filled with oil; prescribedmaintenance intervals are found in the maintenanceinstruction of the respective manufacturer.In case no comparative results are available, the followingtable can be used for a reference value.

2.6 Lubricants

The specified values are valid for the following conditions:

Slew Drives shall generally be relubricated:

After every cleaning.Before and after long inactive periods, e.g. for cranes andconstruction machines during winter months.Cleaning a Slew Drive with steam jet orhigh-pressure cleaner is not permissible!

••

•

Avia

Bechem

Bechem

Bechem

Castrol

Fuchs

Rhenus

Supplier

Avialith 2 EP

High-Lub L 474-2

Beruplex EP-O

RHUS LT 2 EP

Longtime PD0

Renolit Duraplex EP2

Norplex LKP2

Product name

-22

-4

-31

-13

-40

-22

-4

Applicabletemperature range in °F

+266

+248

+302

+248

+284

+320

+302

The table can never replace values established through experience;the most frequent cause of failure of Slew Drives is insufficientlubrication.

••••

Operating temperature on Slew Drive < 158° FCircumferential velocity < 1.64 ft/sec for SP Slew DrivesDriver rotational speed < 5 rpm for WD Slew DrivesLow to medium loads

Table 9:

Dry and clean workshop(rotary tables / robots, etc.)

Work conditions

every 300 hours of operation or onceevery 6 months

Grease-filled Slew DriveLubrication intervals

Difficult conditions in open grounds(crane / bulldozer, etc.)

every 200 hours of operation or onceevery 6 months

Extreme conditions(tunnelling machines/steel mills)

every 50 operating hours, at least, however,every 2 months

Aggressive climatic conditions sea/deserts/Arctic climate/very dirty surrounding/morethan 70 operating hours per week

every 150 hours of operation or onceevery 4 months

Table 8:

50

2.2 Checking the tilting clearance

Wear in the raceway system leads to increased tiltingclearance. It is therefore necessary to check the clearanceafter 700 operating hours, or at the latest after 6 months.

Checking the increase in tilting clearance δK directlyon a Slew Drive

For the procedure to check the increase in the tilting clearance,see P. 48 and P. 49.The value (m1) determined after installation of the Slew Drive isconsidered as the basic value and is deducted from the latestinspection value (mx). The difference between mx and m1 may notexceed 0.0177 in

δK = mx – m1 ≤ δK perm

δK perm = 0.0177 in

Checking the increase in tilting clearance δK not directly onSlew Drive

Increase in tilting clearance is to be converted proportionally foreach measurement (after the installation measurement) and comparedwith δK permissible.

For both checks:

Reduce the inspection interval to 200 operating hours if themeasured increase in tilting clearance amounts to approx. 75%of the maximum permissible increase in tilting clearance.Reduce the inspection interval once again after further increasein tilting clearance (to 50 – 100 operating hours).Replace the Slew Drive if the maximum permissible increase intilting clearance is reached.

•

•

•

2.3 Checking the rotational clearance of series WD

Gear wear leads to increased rotational backlash. Thereforeit is necessary to check the rotational backlash after 700operating hours, at the latest after 6 months. The valuesspecified in Table 7 for rotational backlash shall not beexceeded.

1.

2.3.

For front-end-brake application (brake flanged between motorand Slew Drive), the brake shall be removed with the motor.For an application with a brake mounted to the Slew Drive, thebrake shall be disengaged.For a Slew Drive with an attached permanent brake(series WD-L), the brake shall be removed.

•

•

•

Determine the rotational play of the worm shaft.The established rotational play serves as the basis for comparsionafter later checks.

4.5.

All subsequent checks are performed at the same measuring point,at the same position on the housing and worm wheel or gear ringrelative to another and in the same sequence.All measured values are to be recorded.

•

•

Table 7: Rotational play – limit values

6

6 / 2 start

7

7 / 2 start

8

8 / 2 start

Module of SlewDrive gearing

28°

14°

28°

14°

27°

13.5°

Rotational play –limit value

3

4

4 / 2 start

4.5

5

5 / 2 start

Module of SlewDrive gearing

34°

32°

16°

31°

30°

15°

Rotational play –limit value

The size of the module is listed on the unit name plate.

Reduce the inspection intervals to 200 operating hours if themeasured rotational play amounts to approx. 75% of the maximumpermissible limit value.Reduce the inspection interval once again after further increase(to 50 – 100 operating hours).Replace the Slew Drive if the maximum permissible rotational playis reached.

•

•

•

2.4 Relubrication of Slew Drive or checking oil level / oil change

Grease types specified in the delivery drawing shall beused. Suitable substitute lubricants can be found inTable 9.

Legal and manufacturer provisions about handling the respectivelubricants must be observed.

While rotating the Slew Drive, inject grease into all the cleanedgrease nipples consecutively until a bead of fresh grease forms atleast on one seal or at the bearing gap.Ensure that old grease can flow out of the drive freely.For Slew Drives equipped with an intermediate transmission device(ie - planetary gear), oil shall be changed according to manufacturerinstructions.

1.

2.3.

Procedure

Determine and permanently mark the measuring point in themain loading zone, both on the housing as well as on the wormwheel or on the gear ring.Secure the Slew Drive against rotation.Remove the drive to enable the worm wheel to be easily rotatedby hand.

Installation and Maintenance Instructions for Slew Drives (EW ST US Rev. 5.02)

52

Series Overview

Limiting load diagrams of individual sizes for “compressive” loadPlease refer to the explanations in the Technical Information section of the catalog

0 100 200 300 400 5000

40

80

120

160

200

240

280

6

12

3

7

WD-LA 0223/3-06370WD-LA 0223/3-06630WD-LA 0343/3-06371WD-LA 0419/3-06372WD-LA 0419/3-06631WD-LA 0478/3-06373WD-LA 0625/3-06374

4

5

6

1

2

3

7

Series WD-LA

Worm gear driven type

WD –Drawing reference number

Hardened

Raceway diameter [mm]223, 343, 419, 478 and 625 mm

L: Light series

WD:

06370L 0223 / 3 –

Gearing heat treatment3:

0

5,000

10,000

20,000

30,000

Maximum torque Md max of individual sizes

31,5

85

6,86

1 9,51

8 11,5

10

11,5

10

17,9

13

6,86

1

WD-LA

0223/

3-0637

0

WD-LA

0223/

3-0663

0

WD-LA

0343/

3-0637

1

WD-LA

0419/

3-0637

2

WD-LA

0419/

3-0663

1

WD-LA

0478/

3-0637

3

WD-LA

0625/

3-0637

4

5

4

max

. tor

que

Md

max

[ft-l

bs]

Equi

valen

t tilti

ng m

omen

t [ft-

lbs x

1,0

00]

Equivalent axial load [lbs x 1,000]

A

A: American version

Diagram 1

53

Due to the high gear ratio and the large surface contact between worm and worm gear, very high torque values can betransmitted using very small sized Slew Drives (highest power density). Worm gear driven Slew Drives of the light series WD-L are short-cycle drives for rotation and swiveling applications . Use in continuous rotation applications is notpermissible due to higher duty. The duty should be selected so that over-heating around the gearing contact cannotoccur. Diagram 2 exhibits the maximum permissible duty per minute, depending upon operation torque. When thismaximum permissible duty per minute EDmax ’ is exceeded, the permissibility must be checked by the IMO EngineeringDepartment.

The following conditions apply when determining the maximum permissible duty per minute and when verifying the wearcharacteristic of worm gearing:- Output speed: n = 1.0 rpm- Wear safety factor of worm gearing: SW = 1.3- Observance of the maximum permissible duty EDmax ‘ (see diagram 2)- Ambient temperature 68°F

Determining the maximum permissible duty per minute EDmax ‘ :The maximum permissible duty per minute should never be exceeded

Wear characteristics of the worm gearing:

Gw:Bh:

EDB:Md B:

The operation is permissible as regards wear characteristics,if the following relationship prevails:

If this relationship is not fulfilled, a high rate of wear must beexpected.

Limit value [h] (see diagram 3)Operation time [h]

Duty in operation [%]Operating torque [ft-lbs]

Gw ≥ Bh •EDB100

WD-LA 0223/3-06370WD-LA 0223/3-06630WD-LA 0343/3-06371WD-LA 0419/3-06372WD-LA 0419/3-06631WD-LA 0478/3-06373WD-LA 0625/3-06374

4

5

6

1

2

3

7

Diagram 3

1,000 100,000100

1,000

10,000

Limit

valu

e G w

[h]

7

10,000

EDmax ‘ :

Md B:Md max:

fMd = Md B / Md max

Operating torque [ft-lbs]Maximum torque [ft-lbs] (see diagram 1)

Maximum permissible duty per minute in percentper minute [% / min] (see diagram 2)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00

102030405060708090

EDm

ax ‘ [

% /

min

]

Diagram 2

fMd: Ratio of operating torque to maximumtorque [-]

f Md [-]

WD-

LA

1

2

3

4

5

6

Operating torque Md B [ft-lbs]

54

WD-LA Series

Size 0223 / single row

Size 0223 / double row

Note, mounting face against upper surfaceshall be within the limits of ø8.780 and ø12.953

Mounting holesYZ

= 16 Holes 5/8-11 UNC - 1.181 deep, equally spaced= 15 Holes ø0.709 - 0.394 deep / 5/8-11 UNC - 1.181 deep, equally spaced over 16 pitch

Lubrication ports

Slew drive supplied pre-lubricated

2 Taper type grease nipples on the internal diameter2 Taper type grease nipples on the outside of the housing

Mounting holesYZ

= 16 Holes 5/8-11 UNC - 1.181 deep, equally spaced= 15 Holes ø0.709 - 0.394 deep / 5/8-11 UNC - 1.181 deep, equally spaced over 16 pitch

Lubrication ports

Slew drive supplied pre-lubricated

4 Taper type grease nipples on the internal diameter2 Taper type grease nipples on the outside of the housing

Note, mounting face against upper surfaceshall be within the limits of ø8.780 and ø12.953

1.69

31.

535

3.93

7

5.90

6

ø2.362

10.9

061.

181

0.90

63/4hex.

9.4886.890

16.398

13.8

19

A

B

Z

Y5/8-11 UNC

3.22

8 2.24

4

1.18

1

ø8.740

ø12.795

1.18

10.

394

5/8-11 UNCø5.709Section A - B

ø6.890

ø10.630

1.69

32.

244

3.93

7

5.90

6

ø2.362

10.9

061.

181

0.90

6

9.4886.890

16.398

13.8

19

A

B

3/4hex.

Section A - BZ

Y5/8-11 UNC

3.93