General
Thissectionhasthedescriptionandrepairproceduresforthedifferential.ThereareSpecificationsanda Troubleshootingtableattheendofthissection.
Description
Thisdifferentialisfastenedtotheaxlehousingofthe lifttruck.Thedifferentialgivesasingle-speedreductionforanincreaseintorquetothedrivewheels. Thereisahousing,aringandpiniongearset,and thedifferentialassembly.Theringgeartransfers
powerfromthepinionthroughthedifferentialassemblytotheaxles.Thedifferentialassemblypermitsthedrivewheelstorotateatdifferentspeeds duringaturn.
DifferentialRepair REMOVE
NOTE: Therepairprocedurescoverallunitsunless otherwiseindicated.
NOTE: Thedifferentialassemblycannormallybe removedwithoutremovingthedriveaxle.Onsome trucks,includingtheH7.00-12.50H(H150-275H), thedriveaxlemustberemovedtoremovethedifferentialassembly.
1. Disconnectthedriveshaftatthedifferential.If aspeedreducerorgearboxisinstalled,remove thespeedreducerorgearbox.
2. Someunitshaveadrumordiscbrakeattachedto theoutputyoke.Besuretodisconnectanybrake linkageorbrakelines.Seethebrakesectionfor yourunit.
3. Removetheaxleshaftsfromtheaxlehousing. Seethedriveaxlesectionforyourunit.On STRADDLETRUCKS,disconnectthedrive axleuniversaljointsatthedifferentialyokes. Removethecapscrewsthatfastenthebearing retainerstothedifferentialhousing.Pullthe yoke,stubshaft,andbearingretainerfromthe housing.
DISASSEMBLE
1. Usealiftingdeviceasasupportforthedifferential.Removethehousingcapscrewsandremove thedifferentialfromtheaxlehousing.
2. Iftheunithasadrumordiscbrakeattached totheoutputyoke,removeit.Seethebrakes sectionforyourunit.
3. Iftheringandpiniongearswillbeusedagain, checktheclearancebetweenthegearsandmake arecordofthevalue.SeeFigure5.
4. Acompletedisassemblyisnotnormallynecessary.Disassemblethedifferentialtomakenecessaryrepairs.SeeFigure1.Putmarksonone bearingcapandthecasehalfsothatitcanbeinstalledinthesameplace.Putmarksoneachhalf ofthedifferentialcasesothattheycanbeassembledinthesameway.Keeptheshimsetforthe pinioncarrierassembly.
CAUTION
Neveruseahammerandchiseltoremovethe rivets.Damagetotheholescanoccur.
5. Ifitisnecessary,removetheringgearfrom thecase.Makesuretherivetholesinthecase arenotdamaged.Useacenterpunchanddrill smallerthantherivetstoremovetherivets. Keeptheoldringgearandpinionset.
ASSEMBLE
Pinion,Bearings,andPinionCarrier, Assemble
1. Putdifferentialoilonthebearingsandcups.Installthecupsinthepinioncarrier.SeeFigure1.
2. Installtheinnerbearingandpilotbearing againstthepinionshoulders.Useasleeveand presstopushagainsttheinnerbearingrace.
*SOMEAXLESDONOTHAVETHEPARTSDESCRIBED
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CAUTION
Ifanewpinionisinstalled,anewringgear mustalsobeinstalled.Thepinionandring gearareaset(seeFigure4)andMUSTbeinstalledtogether.
3. Installthepilotbearingwasherandsnapring. Putthepinionassemblyinthepinioncarrier.Installthespacersonthepinion.
NOTE: Duringassemblyatthefactory,onespaceris used.Twothinnerspacersareusedifthepinionor bearingsarereplaced.Thesespacersareselectedfor correctbearingpreload.
NOTE: Somepilotbearingsarefastenedtothepinionwithasnapring,andsomearefastenedwitha punch.Otherscanhaveatwo-piecebearing.
4. Useapresstoinstalltheouterbearingagainst thespacer.Rotatethecarriertomakesurethe bearingsareinstalledcorrectly.Usethepress toapplythecorrectpreload.SeeSpecifications, RivetInstallationPressure.Checkthebearing preloadasdescribedinPinionBearings,Adjust Preloadofthissection.
PinionBearings,AdjustPreload
1. Wrapacordseveraltimesaroundthepinioncarrier.FastenaNewtonorpoundscaletothecord. SeeFigure2.Pullthescaletounwindthecord. Checkthereadingonthescaleasthecordunwindssmoothly.DoNOTusethereadingasthe cordjustbeginstounwind.Thescalereading mustindicate2.2to7.0kg(5to15lb).
Apinioncarrierthathasa76.2mm(3in.)radiusanda2.2kg(5lb)scalereadingisequalto 1.70N•m(15lbfin).Selectaspacersetforthe correctpreload.Athinnersetwillincreasethe preload.
CAUTION
OnH7.00-12.50H(H150-275H)trucks,doNOT usethewasherthatisonthenewpinion.Use thethickerspacer(HysterPN125277).The threadscanbedamagedorthenutcanloosen ifthewasherisused.
2. Ifapresscannotbeusedforpreload,installall thepartsthatareheldbythepinionnut.Tighten thepinionnuttothecorrecttorqueshowninTable1.CheckthepreloadasdescribedinStep1.
1.PRESS 2.SLEEVE
3.PINIONBEARING
Figure2.BearingPreloadCheck PinionCarrierShimSet,AdjustThickness (DepthofPinion)
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NOTE: Usethisprocedureifanewringgearandpinionsetisinstalled,orifthedepthofthepinionhas tobeadjusted.
1. Afterthepreloadiscorrectlyadjustedusingthe spacerset,adjustthepinion.Thepinionisadjustedusingshimsonthepinioncarrierassembly.Ifthesameringgearandpinionareused, usetheoldshimset.SeeFigure3.Ifanewring gearandpinionareused,adjustthepinionasdescribed.
CAUTION
Alwaysuseaminimumofthreeshimsforthe shimset.Usethethinnestshimsontheoutside ofthesetforabetterseal.
2. Thecorrectshimsetthicknesscanbefoundby usingtheoldandnewparts.Usetheoldshimset thicknessandthenumbersontheoldandnew pinionandringgearsets.Forthelocationand identificationofthenumbers,seeFigure4.
NOTE: Alwayscheckthegearsetforthecorrect markstomakesurethegearsareamatchedset.
3. Thelocationofthepinionandringgearmarks areshowninFigure4.Thedescriptionofthe marksisasfollows:
PARTNUMBER.Thepartnumbersarethe partnumberofthemanufacturer.Thepartnumberfortheringgearisalwaysanevennumber. Thepartnumberforthepinionisthenextodd number.Checktomakesurethepinionandring gearareinasequence.Examplesofgearsetpart
numbers:ringgear,36786;drivepinion,36787. Ifagearsetnumberhasaletterthatfollowsthe number,thelettersmustbethesameforboththe ringgearandpinion.
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GEARTEETHNUMBER.Thegearteeth numbersarethenumbersoftheteethonthe pinionandringgear.Thenumberofpinionteeth isthefirstnumber.Anexampleofthisnumber is5-37.Intheexample,thedrivepinionhas5 teethandtheringgearhas37teeth.
GEARSETNUMBER.Thegearsetnumber isaletterandnumber.Makesuretheletterand numberarethesameonthedrivepinionandring gear.AnexampleofagearsetnumberisM29.
PINIONCONENUMBER.Thepinioncone number,isthevariationfromthedesigncenter.Thedesigncenteristheexactdesigndistancefromtheendofthepinionconetothe ringgearcenterline.SeeFigure5.
1.PINIONCONENUMBER(VARIATION)
Figure5.PinionConeNumberLocation
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NOTE: Thepinionconenumberisnotusedwhenthe gearsetnumberisbeingchecked.Thepinioncone numberisusedwhenyouadjustthedepthofthepinioninthecarrier.
Example:PC+3,PC 3,+3,or 3equals.003inch (variation).PC+.03,PC .03,+.03,or .03equals .03mm(variation).
Findthecorrectthicknessoftheshimsetasfollows:
4. Useamicrometertomeasurethetotalthickness oftheoldshimsetthatwasremovedfromunder
thepinioncarrier.Makeanoteofthemeasurementforlateruse.
5. Checkthepinionconenumberfortheoldpinion. SeeFigure5.Ifthisnumberisaplus(+)value, subtractthevaluefromthevalueinStep4.If thepinionconenumberisaminus( )value,add thenumbertothevalueinStep4.Thenumber shownisin0.00Xinch(+2=+0.002inch).The resultisthestandardthicknessforashimset.
NOTE: ThevaluecalculatedinStep5isthethickness ofthestandardshimset,withoutavariation.
6. Checkthepinionconenumberforthenewpinion.Addorsubtractthisnumbertothestandard thicknessvalueofStep5.Addthenumberifthe valueisaplus(+)value.Subtractthenumberif thevalueisaminus( )value.Theresultisthe correctthicknessforthenewshimset.Seethe examples.
NOTE: ThevaluecalculatedinStep6isthethicknessofthenewshimsetthatwillbeinstalled.See theexamplesshowninSpecifications,PinionAdjustment.
CAUTION
Alwaysuseaminimumofthreeshimsforthe shimset.Usethethinnestshimsontheoutside ofthesetforabetterseal.
7. Installthepinioncarrierassemblyusingthecorrectshimset.SeeFigure6.TightenthecapscrewstothecorrectvalueshowninTable1.
a. Ifthereisabracketforadiscbrakecaliper, installthebracketandtightenthecapscrews.
b. Ifthereisaspeedreducerordropbox,install itonthepinioncarrierassembly.UseJohn CraneNo.2® asasealant.Tightenthenuts tothecorrectvalueshowninTable1.
CAUTION
OnH7.00-12.50H(H150-275H)trucks,doNOT usethewasherthatisonthenewpinion. Usethethickerspacer(HysterPartNumber 125277).Thethreadscanbedamagedorthe nutcanloosenifthewasherisused.
8. Installtheuniversaljointyoke,flangeforthe brakerotororbrakedrum,orthegearforthe speedreducer.SeeFigure7.Installthespacer andpinionnut.TightenthepinionnuttothecorrecttorqueasshowninTable1.
DifferentialandRingGear,Assemble
CAUTION
Assemblyofringgearonthedifferentialcase mustbecorrectforcorrectgearadjustment andmaximumwear.
Makesuretheringgearispartofthesetofthepinion andringgear.SeeFigure4.
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CAUTION
Donotinstallacoldringgearontheflange casehalf.Acoldringgearwilldamagethe casehalfbecauseoftheclosetolerance.Metal particlesbetweenthepartswillcausegear runoutthatwillexceedthespecificationof 0.2mm(0.008in.).
1. Heattheringgearin71to82 C(160to180 F) waterforapproximatelytenminutes.Heating thegearmakesitfiteasieronthedifferential case. 1.PINIONANDBEARINGCARRIER 2.SHIMS 3.DIFFERENTIALHOUSING
Figure6.PinionCarrierAssemblyInstallation
WARNING
Wearprotectiveclothingtopreventinjury whenhandlingthehotringgear.
CAUTION
Neveruseapressorhammertoinstallthering gear.
2. Takecareandlifttheringgearfromthewater usingaliftingtool.
3. Installtheringgearontheflangecasehalfimmediatelyafterthegearisheated.Ifthering geardoesnotfiteasilyonthecasehalf,heatthe gearagain.
4. Alignfastenerholesoftheringgearandflange casehalf.Rotatetheringgearasneeded.
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5. IfSPECIALCAPSCREWSareusedtofastenthe ringgeartotheflangecasehalf,installthecapscrews,washers,andnutsasshowninFigure8. ThecapscrewheadsMUSTbeagainstthering gear.Usepairsofcapscrewsoppositeeachother totightenthecaseandringgeartogether.For capscrewtorquespecifications,seeTable1.
6. IfRIVETSareusedtofastentheringgearto theflangecasehalf,install therivetscold.Do notheattherivets.Forthecorrectpressure topresstherivets,seeSpecifications,Pinion PreloadPressure.Themaximumpressuremust beappliedforapproximatelyoneminuteatthe endofthepresscycle.Do notusemorethanthe maximumpressure.Damagetotheholescan occur.Acorrectlyinstalledrivetwillhaveahead atleast3.18mm(0.125 in.)largerthanthehole diameter.Installthe rivetsinpairsopposite eachother(A-A,B-B),fromthecasehalfsideof theassembly.See Figure9.
7. Useathicknessgaugethathasathicknessof 0.08mm(0.003in.)tocheckforcorrectinstallation.Putthegaugebetweentheringgearand thecaseatfour pointsthatareseparatedby90 . Thegaugecannotgoinmorethanhalfthedistancebetween theflangeouterdiameterandthe pilotdiameterforthegear.Ifthegaugegoes morethanhalfthedistance,theringgearmust beremovedandinstalledagain.SeeFigure10.
DifferentialPinionandSideGear Assembly,Assemble
1. Installonethrustwasherandsidegearinthe case.Putthepiniongearsandthrustwashers onthespider.Installthespiderassemblyin thecase.Installtheothersidegearandthrust washer.
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2. Alignthemarksandassemblethetwohalvesof thedifferentialcase.SeeFigure11.
3. UseLoctiteNo.272® onthethreadsofthecapscrews.Installfourofthecapscrews,washers andnutsintothecasehalvesinacrosspattern. ThedistancebetweenthefastenersMUSTbe equal.Tightenthefastenerstothecorrecttorque valueinapatternoppositeeachother.SeeFigure12.AlsoseeTable1.
DifferentialGearsRotatingTorque,Check
NOTE: Makeatoolforcheckingtherotatingtorque ofthedifferentialgears.Thetoolcanbemadefrom anaxleshaftthathasthesamesplinesizeofthe differentialsidegear.SeeFigure13.
1. Putthedifferentialandringgearassemblyina vise.Besuretoinstallsoftmetalcoversforthe jawsofthevisetoprotecttheringgear.
1.APPROXIMATELY305mm(12in.)
2.WELDNUTTOENDOFSHAFT
Figure13.TooltoCheckDifferentialGears
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2. Installthetoolintothedifferentialuntilthe splinesofthetoolengageonesideofthegear.
3. Attachatorquewrenchtothenutonthetool androtatethedifferentialgears.Readthevalue indicatedonthetorquewrenchasthedifferentialgearsrotate.SeeFigure14.Themaximum torqueappliedtoonesidegearmustnotexceed 68N•m(50lbfft).Ifthetorquevalueexceeds thisspecification,disassemblethedifferential gearsfromthecasehalves.
Figure14.RotatingTorqueCheck
4. Checkthecasehalves,spider,gears,andthrust washersfortheproblemthatcausedtheincorrecttorquevalue.Repairorreplacepartsasnecessary.AssemblethepartsafterrepairandrepeatStep1throughStep3.
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DifferentialandRingGearAssembly, Install
1. Cleantheoilanddirtfromtheouterdiametersof thebearingcupsandbearingboresinthecarrier andbearingcaps.Thereisnospecialcleaning required.
2. Applyaxlelubricanttothebearingconesandthe innerdiametersofthebearingcupsofthemain differential.DoNOTgetoilontheouterdiameterofthebearingcup,andDoNOTpermitoilto dropontobearingbores.
NOTE: Adhesivesnormallybecomehard(dry)inapproximatelytwohours.Besuretocompletetheassemblyprocesswithinthistimeperiod.Iftwohours havepassedsinceapplicationoftheadhesive,clean thepartsagainandapplynewadhesive.
3. Applyacontinuousbeadofadhesivetothebearingboresinthecarrierandbearingcaps.Applytheadhesivecompletelyaroundthesmooth, groundsurfacesONLY.DONOTputadhesiveon threadedareas.
4. Installthebearingcupsoverthebearingcones thatareassembledonthecasehalves.SeeFigure15.
cupsMUSTbeflatagainsttheboresbetweenthe carrierlegs.SeeFigure15.Makesurethatthe ringgeardoesnottouchthepinion.
6. Installbothofthebearingadjustingringsinto positionbetweenthecarrierlegs.Turneachadjustingringuntilhandtightagainstthebearing cups.SeeFigure16.
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5. Usealiftingdevicethathasthecapacitytolift theweightofthedifferentialassemblyandinstalltheassemblyintothecarrier.Thebearing
1.BEARINGCAP
2.BEARINGBORE
3.ADJUSTMENTRING
4.ALIGNMENTMARKS
7. Installthebearingcapsoverthebearingsandadjustmentringsinthecorrectlocationasmarked beforeremoval.
WARNING
Weareyeprotection.Donothitsteelpartswith asteelhammer.Partscanbreakandcauseinjury.
8. Usealightleather,plastic,orrubberhammer andseateachbearingcaptomoveitintoposition. ThecapsMUSTfiteasilyagainstthebearings, adjustmentrings,andcarrier.DONOTFORCE THEBEARINGCAPINTOPOSITION.
9. Installthecapscrewsandwashersthathold bearingcapstothecarrier.Tightenthecapscrewsbyhandfourtosixturns,thentighten thecapscrewstothecorrecttorquevalue.See Table1.
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CAUTION
Ifbearingcapsarenotinstalledinthecorrect originallocations,theboresandthreadsin capswillnotmatchthecarrier.Assembling mismatchedcapsintothecarriercanresultin carrierdamageafterreassemblytoaxleand duringvehicleoperation.Donotforcethe bearingcapsintounmatchedborelocationsin thecarrier.
10. Ifthebearingcapsdonotcorrectlyfitintoposition,checkthealignmentmarksbetweenthe capsandthecarrier.RemovethecapsandrepeatStep5.
NOTE: Donotinstallthecotterkeys,pins,orlock plates(asfurnishedonaxlemodel)thatholdthe bearingadjustingringsinposition.First,adjustthe preloadofthedifferentialbearings,adjustthegear clearance,andcheckthetoothcontactpattern.
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DifferentialBearings,PreloadAdjust
1. Makesuretheringgearisnottouchingthepinion.InstalladialindicatorasshowninFigure17.Adjustthedialindicatorsothatthe plungerorpointerisagainstthebacksurfaceof theringgear.
spannertypewrenchcanbeusedforthispurpose.Besurethewrenchfitscorrectlysothat thelugswillnotbedamaged.
3. Pushthedifferentialassemblyleftandrightto seethataxialmovementshowsonthedialindicator.Usetwoprybars,onebetweenthedifferentialcaseandcarrier,andonebetweenring gearsideandthecarrier.Forthemethodused, seeFigure18.
4. Tightenthebearingadjustmentringthatwas justloosenedsothatthereisnomovementofthe differentialassembly.Now,tighteneachadjustmentringonenotchtoobtainthepreload.The maximumaxialmovementpermittedis0.15to 0.33mm(0.006to0.013in.)(see NOTE that follows).Themaximumtorquerequiredtoturn thedifferentialbearingsis1.7to3.9N •m(15to 35lbfin).
NOTE: Use0.08to0.22mm(0.003to0.009in.)on RockwellRS-140andRS-145axles.
5. Continueassemblyandchecktherunoutofthe ringgear.
1.DIALINDICATOR
Figure17.BearingPreloadAdjustment
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CAUTION
Alwaysuseatoolthatengagestwoormoreoppositenotchesintheadjustmentring.AT-bar
1.BARMUSTNOTTOUCHBEARINGS
Figure18.GearMovementCheck
RingGear,RunoutCheck
1. Attachadialindicatortothemountingflangeof thecarrierasshowninFigure17.Adjustthe dialindicatorsothattheplungerorpointeris againstthebacksurfaceoftheringgear.Setthe indicatortozero.
2. Rotatetheringgearandcheckthedialindicatorforthemaximumneedlemovement.The maximummovementpermittedis0.20mm (0.008in.).Ifthemovementexceedsthemaximumlimit,removethedifferentialandringgear assemblyfromthecarrierandfindthereason forthemovement.
3. Installthedifferentialandringgearintothe carrierafterthepartsarerepairedorreplaced. UsetheprocedureinthesectionDifferentialand RingGearAssembly,Install.Repeatthepreload adjustmentofthedifferentialbearings.
GearClearance,Adjust
1. InstalladialindicatorasshowninFigure19.Be suretheplungerorpointertouchesthetoothsurface.Makesurethepreloadadjustmentofthe differentialbearingiscompletebeforetheclearanceisadjusted.
2. Thegearclearanceadjustmentisdonebylooseningonebearingadjustmentringandtightening theotheradjustmentringthesameamount.
NOTE: Iftheoriginalgearsetisinstalled,adjustthe clearancetotheoriginalvaluerecordedinStep1of Disassemble.Ifanewgearsetisinstalled,adjustthe adjustmentringsfor0.25mm(0.010in.).
NOTE: Iftheunithasathrustblock,tightenthe adjustmentscrew.Thethrustblockmustbetight againsttheringgear.Turntheadjustmentscrew 90 counterclockwiseandtightenthejamnut.The clearancebetweenthethrustblockandringgear willbe0.25to0.38mm(0.010to0.015in.).On H6.00-7.00XL(H135-155XL)units,settheclearance byturningthethrustscrewcounterclockwise180 . Tightenthejamnuttothespecificationshownin Table1.Thecorrectclearancebetweenthethrust screwandtheringgearis0.635to0.889mm(0.025 to0.035in.).RefertoFigure20.
InstallintoAxleHousing
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NOTE: Forcorrecttorquevaluesforthefasteners usedinthisinstallation,seeTable1.Forgenerallocationofthefasteners,seeFigure21.
1. UseLoctiteSealantNo.504orsiliconeRTV sealantontheflangeofthedifferentialassemblyhousing.Installthedifferentialassemblyin theaxlehousing.Tightenthenutsorcapscrews. Dothefollowingasrequired:
a. ONUNITSWITHAIROPERATEDDISC BRAKES,installmountingbracketsfor slackadjusters.Installtheairchamber rodpinsandthecotterpininthesplined coupling.
b. ONUNITSWITHHYDRAULICDISC BRAKES,installthepartsofthebrakeas describedinthebrakesectionforyourunit. Connectthedriveshaftandtightenthe capscrewsattheyoketo120N•m(90lbfft).
Figure19.GearClearanceCheck
GearSet,ToothContactPatternCheck
NOTE: Thegearclearancecanbechangedwithin thelimitsof0.13to0.38mm(0.005to0.015in.)for bettertoothcontact.
c. OnH7.00-12.50H(H150-257H)units,assembletheaxle.Installtheaxleinthelifttruck ifitwasremoved.Connectthedriveshaft. Makesuretousea11mm(0.4375in.)spacer betweenthespeedreducergearandthepinionnut.Tightenthenutto1342to1790N•m (990to1320lbfft)withoutlubricant.Always useanewnut.
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d. OnSTRADDLETRUCKS,installthebearingandsealinthebearingretainer.Install theuniversaljointyokeinthebearingretainer.Installthesnapringtoholdtheyoke. Installthestubshaftinthedifferential.Use anewgasketandinstalltheyokeandbearingretainer.Installthecapscrewsforthe bearingretainer.Installtheyokecapscrew. Tightenthecapscrews.
2. DothefollowingforH26.00-32.00C(H550-700C) andH36.00-48.00C(H800-1050C)unitswitha drumbrakeinstalledonthedifferential:
NOTE: Specialtools(apilotshaft,acollar,andan installationnut)arerequiredtoinstalltheyokecorrectly.SeeFigure21.
a. Applyaxlelubricantontheyokeseal.
b. Checkallsurfacesoftheyokehubfordamage.Ifnecessary,polishtheyokehubwith emeryclothorcrocuscloth.
c. Installthepilotshaftontheinputshaftof thedifferential.SeeFigure21.
CAUTION
Donotuseahammerormallettoinstallthe yokeontotheshaft.Ahammerormalletcan damagetheyoke.
d. Slidetheyokeoverthepilotshaft.Alignthe yokesplineswiththeshaftsplines.Slidethe collarontothepilotshaftandagainstthe yoke.SeeFigure21.
CAUTION
Donotusetheyokeassemblynutfortheinstallationprocedure.UseasimilarnutfortheproceduredescribedinFigure21.
e. Installthenutonthepilotshaft.Tightenthe nutagainstthecollaruntiltheyokeisinthe
correctpositionontheinputshaft.Thenut canrequiretorqueupto271N •m(200lbfft) toinstalltheyokecorrectly.
CAUTION
Makesurethesealisnotdamagedastheyoke passesthroughtheseal.
f. Removethenut,collar,andpilotshaft.Installtheassemblynutfortheyokeontheend oftheinputshaft.Tightentheassemblynut to1627N•m(1200lbfft).
g. Installthebrakedrumandfastenwiththe eightcapscrews.
h. Attachthelinkagetothebrakeadjusterarm. Connectthedriveshaftfromtheyokeflange onthebrakedrum.
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NOTE: ItemNumbersinTable1correspondtonumberedcalloutsonFigure22.