General
Thissectioncontainsdescriptionandrepairproceduresforthedifferential.ThereisaSpecificationssection andaTroubleshootingsectionattheendofthissection.
Description
Thisdifferentialisfastenedtothedriveaxlehousingofthelifttruck.Thedifferentialprovidesasingle-speedreductionforanincreaseintorquetothe drivewheels.Thereisahousing,aringandpinion gearset,andthedifferentialassembly.Theringgear
transferspowerfromthepinionthroughthedifferentialassemblytotheaxles.Thedifferentialassembly permitsthedrivewheelstorotateatdifferentspeeds duringaturn.SeeFigure1.
DifferentialRepair REMOVE
NOTE: Therepairprocedurescoverallunitsunless otherwiseindicated.
DifferentialCarrierFromAxleHousing, Remove
NOTE: Thedifferentialassemblycannormallybe removedwithoutremovingthedriveaxle.Onsome trucks,includingtheH7.00-12.50H(H150-275H), thedriveaxlemustberemovedtoremovethedifferentialassembly.Ifremovalofthedriveaxleis necessary,seethe DriveAxle servicemanualfor yourlifttruckmodel.
1. Removethemast.Seethe Mast sectionforyour lifttruckmodelfortheremovalprocedures.
2. Raisetheendofthevehiclewheretheaxleis mounted.Useajackorotherliftingtool,and placesafetystandsundereachsideoftheaxle. SeeFigure2.
WARNING
Blockthewheelstopreventthelifttruck frommoving.Supportthelifttruckwith safetystands.DONOTworkunderalifttruck
supportedonlybyjacks.Jackscanslipand fallover.Seriouspersonalinjurycanresult.
3. Placejackstandsundereachspringseatofthe axle,toholdthelifttruckintheraisedposition.
1.SAFETYSTANDS
4. Removeplugfromthebottomoftheaxlehousing anddraintheoilfromtheaxleassembly.
5. Disconnectthedriveshaftatthedifferential.If aspeedreducerorgearboxisinstalled,remove thespeedreducerorgearbox.
6. Someunitshaveadrumordiscbrakeattachedto theoutputyoke.Disconnectanybrakelinkageor brakelines.Seethe Brake sectionforyourunit.
7. Disconnectthedrivelineuniversaljointfromthe pinioninputyokeorflangeonthedifferential carrier.SeeFigure3.
8. Removetheaxleshaftsfromtheaxlehousing. Seethe DriveAxle sectionforyourmodeloflift truckfortheprocedures.
a. OnStraddleTrucks™,disconnectthedrive axleuniversaljointsatthedifferential yokes.Removethecapscrewsthatfastenthe bearingretainerstothedifferentialhousing.Pulltheyoke,stubshaftandbearing retainerfromthehousing.
9. Placeatransmissionjackunderthedifferential carrierforsupport.SeeFigure4.
Figure4.DifferentialCarrierSupport
16. Usealiftingdeviceandliftthedifferentialcarrierbytheinputyokeorflangeandplacetheassemblyonarepairstand.SeeFigure5.
CAUTION
Whenusingaprybar,becarefulnottodamagethedifferentialcarrierorhousingflange. Damagetothesesurfaceswillcauseoilleaks.
1.DIFFERENTIALCARRIER
2.REPAIRSTAND
Figure5.DifferentialCarrierStand
Different ialandRingGearFrom DifferentialCarrier,Remove
NOTE: Someofthepartsdescribedbelowarenot foundonsomedifferentialcarriermodels.SeeFigure1.
NOTE: Beforeworkingonthedifferentialcarrier,inspectthehypoidgearsetfordamage.Ifinspection showsno damage,thesamegearsetcanbeused again.Measurethebacklashofthegearsetand makearecordofthedimension.SeethesectionRing GearBacklash,Adjust.Duringdifferentialreassembly,adjustthebacklashtotheoriginalrecordeddimensionwhenthegearsetisinstalledintothedifferentialcarrier.
4. Markonedifferentialcarrierlegandbearingcap tocorrectlymatchthepartsduringdifferential carrierassembly.Markthepartsusingacenter punchandhammer.SeeFigure7.
5. Removethecotterpinsthatholdthebearingadjustingringsinposition.Somedifferentialcarriermodelshavedowelpinsorlockplatesholdingthebearingadjustingringsinposition.Each lockplateisheldinpositionbytwocapscrews. SeeFigure8.
6. Removecapscrewsandwashersholdingthetwo bearingcapsonthedifferentialcarrier.SeeFigure8.
Figure8.BearingAdjustingRingRemoval
7. Removethebearingcapsandbearingadjusting ringsfromthedifferentialcarrier.SeeFigure9.
NOTE:
1. Fastenayokeorflangebartotheinputyokeor flange.Whenthenutisremoved,thebarwill holdthedrivepinioninposition.SeeFigure11.
2. Removethenutandwasherfromthedrivepinion.
3. Removetheyokeorflangebar.
CAUTION
Donotuseahammerormallettoloosenand removetheyokeorflange.Ahammerormalletcandamagethepartsandcausedriveline runoutordrivelineimbalanceproblemsafter carriertodrivelineassembly.
4. Removetheyokeorflangefromthedrivepinion. Iftheyokeorflangeistightonthepinion,usea pullerforremoval.SeeFigure12.
5. Removethecapscrewsandwashersthatholdthe pinioncarrierinthedifferentialcarrier.SeeFigure13.
A. YOKEPULLER B. FLANGEPULLER
WARNING
Useabrassorleathermalletforassemblyand disassemblyprocedures.Donothitsteelparts withasteelhammer.Piecesofapartcanbreak offandcauseseriouspersonalinjury.
CAUTION
Donotuseaprybartoremovethepinioncarrierfromthecarrier.Aprybarcandamagethe bearingcase,shims,anddifferentialcarrier.
6. Removethedrivepinion,pinioncarrier,and shimsfromthedifferentialcarrier.SeeFigure13.Ifthepinioncarrieristightonthe differentialcarrier,hitthepinioncarrieratseveralpointsaroundtheflangeareawithaleather, plasticorrubbermallet.
7. Inspecttheshims.Iftheyareingoodcondition, keeptheshimstogetherforuseduringdifferentialcarrierassembly.
8. Iftheshimsaretobereplaced,firstmeasurethe totalthicknessofthepack.Makeanoteofthe dimension.Thedimensionwillbeneededtocalculatethedepthofthedrivepinioninthedifferentialcarrierwhenthegearsetisinstalled.
DISASSEMBLE
DifferentialandRingGearAssembly, Disassemble
NOTE: Someofthepartsdescribedbelowarenot foundonsomedifferentialcarriermodels.SeeFigure1.
NOTE: Makesuretherearematchingmarksonthe casehalvesofthedifferentialassembly.SeeStep4 inthesectionDifferentialandRingGearFromDifferentialCarrier,Remove.SeeFigure7.
WARNING
Useabrassorleathermalletforassemblyand disassemblyprocedures.Donothitsteelparts withasteelhammer.Piecesofapartcanbreak offandcauseseriouspersonalinjury.
1. Removethecapscrewsandwashersthathold thecasehalvestogetherandseparatethecase halves.Ifnecessary,useabrass,plastic,or leathermallettoloosentheparts.
2. Removethedifferentialspider,fourpiniongears, twosidegears,andsixthrustwashersfrominsidethecasehalves.SeeFigure14.
c. Presstherivetsthroughholesinthering gearandflangecasehalf.Pressfromthe drilledrivethead.
1.THRUSTWASHER
2.SIDEGEAR
3.SPIDER,PINIONS,ANDTHRUSTWASHERS
Figure14.RingGearDisassembly
3. Iftheringgearneedstobereplaced,remove bolts,nuts,andwashersholdingtheringgearto theflangecasehalf.
CAUTION
Donotremovetherivetsorrivetheadswitha chiselandhammer.Usingaflatedgetoolcan causedamagetotheflangecase.SeeFigure15.
4. Ifyourdifferentialmodelusesrivetstoholdthe ringgeartotheflangecasehalf,removetherivetsasfollows:
a. Centerpuncheachrivetheadinthecenter, ontheringgearsideoftheassembly.
b. Drilleachrivetheadontheringgearsideof theassemblytoadepthequaltothethicknessofonerivethead.Useadrillbitthatis 1/32ofaninchsmallerthanthebodydiameteroftherivets.SeeFigure15.
A. CORRECTDRILLINGRIVETSFROMHEAD
B. WRONGCHISELINGRIVETSFROMHEAD Figure15.RivetRemoval
WARNING
Observeallwarningsandcautionsprovided bythepressmanufacturertoavoiddamageto componentsandseriouspersonalinjury.
5. Separatethecasehalfandringgearusinga press.Supporttheassemblyundertheringgear withmetalorwoodblocksandpressthecase halfthroughthegear.SeeFigure16.
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6. Ifthedifferentialbearingsneedtobereplaced, removethebearingconesfromthecasehalves. Useabearingpullerorpress.SeeFigure17.
WARNING
Observeallwarningsandcautionsprovided bythepressmanufacturertoavoiddamageto componentsandseriouspersonalinjury.
NOTE: Someofthepartsdescribedbelowarenot foundonsomedifferentialcarriermodels.SeeFigure1.
1. Placedrivepinionandpinioncarrierinapress. Thepinionshaftmustbetowardthetopofthe assembly.Addsupportsforthepinioncarrier undertheflangearea.SeeFigure18.
2. Pressthedrivepinionthroughthepinioncarrier. SeeFigure18.
WARNING
Useabrassorleathermalletforassemblyand disassemblyprocedures.Donothitsteelparts withasteelhammer.Piecesofapartcanbreak offandcauseseriouspersonalinjury.
NOTE: Theinnerbearingconeandbearingspacer willremainonthepinionshaft.SeeFigure19.
3. Ifapressisnotavailable,usealeather,plastic orrubbermallettodrivethepinionthroughthe pinioncarrier.
CAUTION
Whenremovingtheoilseal,Donotdamagethe wallofthebore.Damagetotheborewallcan resultinoilleaks.
NOTE: Alwaysreplacetheoilsealwithanewseal duringreassembly.
4. Removetheoilsealfromthepinioncarrier.See Figure19.
5. Inspectthepinionbearingsandreplaceifnecessary.Ifthepinionbearingsneedtobereplaced, performthefollowing:
a. Removetheinnerandouterbearingcups fromtheinsideofthecage.Useeitherapress andsleeve,bearingpuller,orasmalldrift pin.SeeFigure17andFigure20.Ifapress isused,providesupportforthepinioncarrierundertheflangeareawithmetalorwood blocks.
CAUTION
Thepullermustfitundertheinnerraceof theconetoremovetheconecorrectlywithout damage.
b. Removetheinnerbearingconefromthe drivepinionwithapressorbearingpuller. SeeFigure21.
6. Ifthespigotbearingneedstobereplaced,place thedrivepinioninavise.Installasoftmetal coverovereachvisejawtoprotectthedrivepinion.
7. Removethesnapringfromtheendofthedrive pinion.SeeFigure22.
NOTE: Somespigotbearingsarefastenedtothedrive pinionwithaspecialpeeningtool.SeeFigure23.
NOTE: Somespigotbearingsareatwo-pieceassembly.Removetheinnerracefromthepinionwitha bearingpuller.Removetheouterrace/rollerassemblyfromthepinioncarrier withadriftorapress.See Figure24.
8. Removethespigotbearingfromthedrivepinion withabearingpuller.
CLEANANDINSPECT
WARNING
Cleaningsolventscanbeflammableandtoxic andcancauseskinirritation.Whenusing cleaningsolvents,alwaysfollowtherecommendationsofthemanufacturer.
WARNING
Compressedaircanmoveparticlessothatthey causeinjurytotheuserortootherpersonnel. Makesurethatthepathofthecompressedair isawayfromallpersonnel.Wearprotective gogglesorafaceshieldtopreventinjurytothe eyes.
Cleanandinspectthefollowingpartsofthedifferential:
•Yoke-Cleanthesurfaceoftheyokejournalwitha cleaningsolventandinspecttheoriginalyokeseal surfaceforanygrooves.
•Driveaxle-Cleanthepartsoftheaxlewithsolventanddrywithcompressedair.Inspectallmachinedsurfacesandbearingsforwearanddamage.
•TaperedRollerBearings-Inspectthecup,cone, rollers,andcageofalltaperedrollerbearingsinthe assembly.Ifbearingsshowsignsofwear,cracks,or damage,replacewithnewbearing.
•PinionsandGears-Inspectthepinionsandgears forwearordamage.Gearsthatarewornordamagedmustbereplaced.
•Axleshafts-Inspecttheaxleshaftsforwearand cracksattheflange,shaftandsplines.Ifaxle shaftsshowsignsofwearordamage,replacethe axleshafts.
•Maindifferentialassembly-Inspectallpartsof themaindifferentialassemblyforwearordamage. Partsthataredamagedmustbereplaced.SeeFigure25forpartstoinspect.
ASSEMBLE
Pinion,Bearings,andPinionCarrier, Assemble
NOTE: Someofthepartsdescribedbelowarenot foundonsomedifferentialcarriermodels.SeeFigure1.
1. Putdifferentialoilonthebearingsandcups.Installthecupsinthepinioncarrier.SeeFigure1.
2. Installtheinnerbearingandspigotbearing againstthepinionshoulders.Useasleeveand presstopushagainsttheinnerbearingrace.
CAUTION
Ifanewpinionisinstalled,anewringgear mustalsobeinstalled.Thepinionandring gearareaset(seeFigure32)andmustbeinstalledtogether.
NOTE: Duringassemblyatthefactory,onespaceris used.Twothinnerspacersareusedifthepinionor bearingsarereplaced.Thesespacersareselectedfor correctbearingpreload.
NOTE: Somespigotbearingsarefastenedtothepinionwithasnapring,andsomearefastenedwitha punch.Otherscanhaveatwo-piecebearing.SeeFigure24.
3. Installthespigotbearingwasherandsnapring. Putthepinionassemblyinthepinioncarrier.Installthespacersonthepinion.SeeFigure19.
4. Useapresstoinstalltheouterbearingagainst thespacer.Rotatethecarriertomakesurethe bearingsareinstalledcorrectly.
5. UseeitherthePressMethodortheYokeor FlangeMethod,andapplythecorrectpreload. SeeSpecifications,Table6.Checkthebearing preloadasdescribedinPinionBearings,Adjust Preloadofthissection.
PinionBearings,AdjustPreload
PressMethod
WARNING
Observeallwarningsandcautionsprovided bythepressmanufacturertoavoiddamageto componentsandseriouspersonalinjury.
NOTE: Ifapressisnotavailable,orthepressdoes nothaveapressuregauge,usetheYokeorFlange Methodtoadjustpinionbearingpreload.
1. Placethedrivepinionandcarrierassemblyina presswiththegearhead(teeth)towardthebottom.
2. Installasleeveofthecorrectsizeagainsttheinnerraceoftheouterbearing.SeeFigure19.
3. Applyandholdthecorrectamountofpressureto thepinionbearings.SeeSpecifications,Table6. Aspressureisapplied,rotatethepinioncarrier severaltimessothatthebearingsmakenormal contact.
4. Whilepressureisheldagainsttheassembly, wrapacordseveraltimesaroundthepinion carrier.FastenaNewtonorpoundscaletothe cord.SeeFigure26.