Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
Foreword
SMCS-7494
LiteratureInformation
Thismanualshouldbestoredintheoperator'scompartmentintheliteratureholderorseatback literaturestoragearea.
Thismanualcontainssafety,operation,transportation,lubricationandmaintenanceinformation.
Somephotographsorillustrationsinthispublicationshowdetailsorattachmentsthatcanbedifferent fromyourmachine.Guardsandcoversmighthavebeenremovedforillustrativepurposes.
Continuingimprovementandadvancementofproductdesignmighthavecausedchangestoyour machinewhicharenotincludedinthispublication.Read,studyandkeepthismanualwiththe machine.
Wheneveraquestionarisesregardingyourmachine,orthispublication,pleaseconsultyour Caterpillardealerforthelatestavailableinformation.
Safety
TheSafetySectionlistsbasicsafetyprecautions.Inaddition,thissectionidentifiesthetextand locationsofwarningsignsandlabelsusedonthemachine.
ReadandunderstandthebasicprecautionslistedintheSafetySectionbeforeoperatingorperforming lubrication,maintenanceandrepaironthismachine.
Operation
TheOperationSectionisareferenceforthenewoperatorandarefresherfortheexperiencedone. Thissectionincludesadiscussionofgauges,switches,machinecontrols,attachmentcontrols, transportationandtowinginformation.
Photographsandillustrationsguidetheoperatorthroughcorrectproceduresofchecking,starting, operatingandstoppingthemachine.
Operatingtechniquesoutlinedinthispublicationarebasic.Skillandtechniquesdevelopasthe operatorgainsknowledgeofthemachineanditscapabilities.
Maintenance
TheMaintenanceSectionisaguidetoequipmentcare.Theillustrated,step-by-stepinstructionsare groupedbyservicingintervals.ItemswithoutspecificintervalsarelistedunderWhenRequired topics.ItemsintheMaintenanceIntervalschartarereferencedtodetailedinstructionsthatfollow.
MaintenanceIntervals
Usetheservicehourmetertodetermineservicingintervals.Calendarintervalsshown(daily,weekly, monthly,etc.)canbeusedinsteadofservicehourmeterintervalsiftheyprovidemoreconvenient servicingschedulesandapproximatetheindicatedservicehourmeterreading.Recommendedservice shouldalwaysbeperformedattheintervalthatoccursfirst.
Underextremelysevere,dustyorwetoperatingconditions,morefrequentlubricationthanisspecified intheMaintenanceIntervalschartmightbenecessary.
Performserviceonitemsatmultiplesoftheoriginalrequirement.Forexample,atEvery500Service Hoursor3Months,alsoservicethoseitemslistedunderEvery250ServiceHoursorMonthlyand Every10ServiceHoursorDaily.
MachineDescription
Thismachineisequippedwitha3408dieselengine.Ithasafour-speedforwardthree-speedreverse transmissionandisdesignedprimarilyformovingmaterial.
Copyright1993-2025CaterpillarInc. AllRightsReserved. PrivateNetworkForSISLicensees.
FriAug104:12:48UTC+05302025
Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
ProductIdentification,SerialNumberandECPlateLocations
TheProductIdentificationNumber(PIN)willbeusedtoidentifyapoweredmachinethatisdesigned foranoperatortoride.
Caterpillarproductssuchasengines,transmissions,andmajorattachments,etc.,notdesignedforan operatortorideareidentifiedbySerialNumbers.
Forquickreference,recordtheidentificationnumbersinthespacesprovidedbelowtheillustration.
EngineSerialNumber____________________
ECMark
NOTE:PlateonmachinesgoingintoECcountries. Plateislocatedonthecab.
Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
SpecificationsandModelViews
Engine(1),fueltank(2)andbucket(3).
Operator'scompartment(4),hydraulictank(5),radiator(6),transmission(7),andbattery(8).
Basicmachineshippingspecificationsarelistedbelow.
FriAug104:13:45UTC+05302025
Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
LiteratureReferenceMaterials
SMCS-7494
CaterpillarReferenceMaterial
ThefollowingliteraturecanbeobtainedthroughanyCaterpillardealer.
SEBD0518,KnowYourCoolingSystem
SEBD0970,CoolantandYourEngine
SEBD0717,DieselFuelsandYourEngine
SEHS9031,StorageProcedureforCaterpillarProducts
SEBU5898,ColdWeatherRecommendationsOperationandMaintenanceManual
SEBU6310,EMALubricatingOilsDataBookforengines
SEBD0640,OilandYourEngine
SEBU6250,CaterpillarMachineLubricantRecommendations
SEBU5407,SafetyManual
SENR5720,ServiceManual
SEBP2023,PartsManualfor8YG0001-Up
TranslatedOperation&MaintenanceManualsareavailable.ContactanyCaterpillardealerfor manual.
MachineDecommissioningandDisposal
Machinedecommissioninganddisposalwillvarywithlocalregulations.Contactthenearest Caterpillardealerforadditionalinformation.
AdditionalReferenceMaterial
ASTMD2896TBNMeasurements(Cannormallybeobtainedfromyourlocaltechnologicalsociety, libraryorcollege.)
SAEJ313DieselFuels(FoundintheSAEhandbookorcanbeobtainedfromanylocallibrary, collegeortechnologicalsociety.)
SAEJ754Nomenclature(NormallyfoundintheSAEhandbook.)
SAEJ183Classification(NormallyfoundintheSAEhandbook.)
Copyright1993-2025CaterpillarInc. AllRightsReserved. PrivateNetworkForSISLicensees.
FriAug104:13:12UTC+05302025
This is the sample of the manual Click on the download link for complete Manual
Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
Every3000ServiceHoursor2Years
YoumustreadandunderstandthewarningsandinstructionscontainedintheSafetysectionofthis manualbeforeperforminganyoperationormaintenanceprocedures.
CoolingSystemCoolant
ChangeCoolant/CleanSystem/ReplaceThermostat NOTICE
Donotchangethecoolantuntilyoureadandunderstandthematerial intheCoolingSystemSpecificationssection.
Drainthecoolantearlierwheneverthecoolantisdirtyorfoamingisobserved.
Replacingyourthermostatpriortofailureisagoodpreventivemaintenancepracticebecauseit reducesyourchancesforunscheduleddowntime.Failuretoreplaceyourthermostatonaregularly scheduledbasiscouldcausesevereenginedamageandcostyoumoney.
NOTE:IfreplacingthermostatONLY,drainthecoolantfromthecoolingsystemtoalevelbelowthe thermostathousing.
SinceCaterpillarenginesincorporateashuntdesigncoolingsystem,itismandatorytoalwaysoperate theenginewithathermostat.
NOTE:Thethermostatscanbereusediftheyaretestedandmeetthetestspecificationsandarenot damagedorhaveexcessivebuildupofdeposits.
1.Stoptheengineandallowtocool.
2.Removetheradiatorcapslowlytorelievepressureandopenthedrainvalveandallowthecoolant todrain.Drainvalveislocatedundertheradiator.
3.Removethebolts(1)thatfastenthethermostathousing(2)tothecylinderheadandremovethe thermostathousingandgaskets.
4.Removethethermostatandthesealfromthehousing.
5.Installthesealgasketandthermostattothehousing.
6.Installthehousingtothecylinderhead.
7.Closethedrainvalve.Fillthesystemwithcleanwateranda6to10%concentrationofcooling systemcleaner.
8.Startandruntheenginefor90minutes.Stoptheengineanddrainthecleaningsolution.
9.Flushthesystemwithwater,withtheenginestopped,untilthedrainingwaterisclear.
10.Closethedrainvalve.
11.Addthecoolantsolution.SeeCoolingSystemSpecificationsandLubricantViscositiesandRefill Capacities.
NOTE:Donotaddsupplementalcoolantadditiveorchangeelementatthistime,unlessyouarenot usingCaterpillarAntifreezewhichcontainsadditive.
12.Starttheengineandoperateitwiththeradiatorcapoff,untilthethermostatopensandthelevel stabilizes.
13.Maintainthecoolantleveltowithin13mm(.5in)ofthebottomofthefillpipe.
14.Installthecap.
15.Stoptheengine.
CleantheCoolingSystemReliefValve
Cleanorreplacethereliefvalveifthesystemoverheatsorlossofcoolantisobserved.
1.Removeradiatorcap(1)slowlytorelievepressure.
2.Removebolts(2)fromthevalveandremovethevalveassembly.
3.Inspectvalve(5),valveseals(4)andgasket(3).Replaceifnecessary.
4.Inspectvalvecover(6)andmountingbolts(2).
5.Installthereliefvalveassembly.
6.Checkthecoolantlevel.Maintainthecoolantleveltowithin13mm(.5in)ofthebottomofthefill pipe.
7.Installtheradiatorcap.
Compressedairispreferred,buthighpressurewaterorsteamcanbeusedtoremovedust,leavesand generaldebrisfromradiatorfins.
Copyright1993-2025CaterpillarInc. AllRightsReserved. PrivateNetworkForSISLicensees.
FriAug104:20:13UTC+05302025
Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
Every2000ServiceHoursor1Year
YoumustreadandunderstandthewarningsandinstructionscontainedintheSafetysectionofthis manualbeforeperforminganyoperationormaintenanceprocedures.
HydraulicTank
ChangetheOil
Operatethemachinelongenoughtowarmtheoil.
Themachineshouldbelevel.Allattachmentsshouldbeloweredtothegroundwithaslightdown pressure.Theparkingbrakeshouldbeengaged,andtheenginestopped.
1.Opentheaccesscover.
2.Removethehydraulicsystemoiltankfillcap.
3.Removethedrainplug,locatedinthebottomofthehydraulictank.
4.Installa1inchNPTpipenipple,100mm(4in)long,toopentheinternaldrainvalveanddrainthe oil.
5.Removethepipenippleandinstallthedrainplug.
6.Changethehydraulicsystemfilters.SeeHydraulicSystemintheEvery500ServiceHoursor3 Monthssection.
7.Removethefillscreen.Cleanandinstallfillscreen.
8.Fillthehydraulicsystemoiltank.SeeLubricantViscositiesandRefillCapacities.
9.Inspectthefillcapgasket.Replacethegasketifdamaged.
10.Installtheoilfillcap.
11.Startandruntheengineforafewminutes.
12.MaintaintheoillevelabovetheADDCOLDmarkinthesightgauge(1).Addoilthroughthefill tube(2),ifnecessary.
NOTE:Theoilmustbefreeofbubbles.Ifbubblesarepresentintheoil,airisenteringthehydraulic system.Inspectthesuctionlinehosesandclamps.
13.Stoptheengine.
14.Ifnecessary,tightenanylooseclampsandconnections.Replaceanydamagedhoses. DifferentialsandFinalDrives
ChangetheOil
1.Positioneachfrontwheelwiththedrainplugdown.Removetheplugsandallowtheoiltodrain.
2.Removethefrontdifferentialdrainplugandallowtheoiltodrain.
3.Cleanandinstallthedifferentialandfinaldrivedrainplugs.
4.Removethefrontdifferentialfillplug.
5.Fillthefrontdifferentialtothebottomofthefillopenings.SeetheLubricantViscositiesandRefill Capacities.Cleanandinstallthefillplug.
6.Positionthefrontwheelssothefillplugsareevenwiththecenterlineofthewheel.Removethefill plugs.
7.Fillbothfrontfinaldrivesslowlytothebottomofthefillopenings.SeetheLubricantViscosities andRefillCapacities. Rear
1.Positioneachrearwheelwiththedrainplugdown.Removetheplugsandallowtheoiltodrain.
2.Removethereardifferentialdrainplugandallowtheoiltodrain.
3.Cleanandinstallthedifferentialandfinaldrivedrainplugs.
4.Removethedifferentialfillplug.
5.Positiontherearwheelssothefillplugsareevenwiththecenterlineofthewheel.Removethefill plugs.
6.Fillbothrearfinaldrivesslowlytothebottomofthefillopenings.SeetheLubricantViscosities andRefillCapacities.
BucketPivotPins
LubricatetheLowerPins
Wipeallfittingsbeforelubricating.
1.Removetheaccessplugsfromtheinnerandoutercollets.
2.Removetheoilplugsfromtheendsofthepin.
3.Installaspecialfitting(7K6627)intheouterendofthepin.
NOTICE
Useanewgreasegunorthoroughlywashagreasegunandnozzlein clean,nonflammablesolvent.
Thoroughlydrythegreasegunandnozzle.Makesurenogrease remainsinthegunorthenozzle.
4.Pumptheoilintothepinthroughthespecialfittingandallowtheexcessoiltocomeouttheother endofthepin.Flushthepinthoroughlywithoil.
5.Wipeexcessoilfromtheendofthepin.Installacleanoilpluginthepin.
6.Installacleanaccessplugintheinnercollet.
7.Removethespecialfittingfromthepin.Installacleanpluginthepin.
8.Installacleanaccessplugintheoutercollet.
9.Lubricatetheremainingbucketpivotpins.
10.Totaloffourbucketpivotpins.
EngineValveLash
Adjust
Topreventpossibleinjury,donotusethestartermotortoturnthe flywheel.
Hotenginecomponentscancauseburns.Allowadditionaltimeforthe enginetocoolbeforemeasuringvalveclearance.
NOTICE
Measurethevalvelashwiththeenginestopped.Toobtainanaccurate measurement,allowatleast20minutesforthevalvestocooltoengine cylinderheadandblocktemperature.
Adjustthevalveclearancetowithin±0.08mm(.003in)ofthevalveclearancesettinggiveninthe chart.
RefertotheServiceManualoryourCaterpillardealerforthecompletevalveadjustmentprocedure.
EngineValveRotators
Check
Wheninspectingthevalverotators,protectiveglassesorfaceshieldand protectiveclothingmustbeworn,topreventbeingburnedbyhotoil spray.
1.StarttheengineandrunatLowIdle.
2.Watchthetopsurfaceoneachvalverotator.Eachvalverotatorshouldturnslightlyeachtimethe valvecloses.
Ifavalvefailstorotate,contactyourCaterpillardealer.
BrakeAccumulator
CheckPressure
ContactyourCaterpillardealertohavethebrakeaccumulatorprechargepressurechecked.
Useonlydrynitrogengasforrecharge.
FriAug104:20:03UTC+05302025
Product:WHEELLOADER
Model:988FWHEELLOADER8YG
Configuration:988FWheelLoader8YG00001-UP(MACHINE)POWEREDBY3408Engine
OperationandMaintenanceManual
988FWHEELLOADER
MediaNumber-SEBU6466-00PublicationDate-01/03/1993DateUpdated-11/10/2001
Every1000ServiceHoursor6Months
YoumustreadandunderstandthewarningsandinstructionscontainedintheSafetysectionofthis manualbeforeperforminganyoperationormaintenanceprocedures.
TransmissionOil
ChangetheOil
Operatetheenginelongenoughtowarmtheoil.Themachinemustbelevel.Lowerthebucketwith slightdownpressure.
Engagetheparkingbrake.Stoptheengine.
1.Removethetransmissiondrainpluganddraintheoil.
2.Changethefilterelement.SeethetopicTransmissionOilFilterunderEvery500ServiceHoursor 3Months.
3.Removethemagneticstrainercover.
4.Removethemagnetsfromthehousing.
5.Removethescreenfromthehousing.
6.Washthetubeandthescreeninaclean,nonflammablesolvent.
7.Cleanthemagnetswithacloth,astiffbristlebrushorpressureair.
NOTICE
Donotdroporrapthemagnetsagainstanyhardobjects.Replaceany damagedmagnets.
8.Cleanthecoverandinspecttheseal.Replacetheseal,ifitisdamaged.
9.Insertthemagnetsinthescreen.
10.Insertthescreen,tubeandmagnetsinthehousing.
11.Installthecover.Tightenthecoverbolts.
12.Cleanandinstallthetransmissiondrainplug.
13.Opentheaccesscover.
14.Fillthetransmissionwithoilthroughthefilltube.SeetheLubricantViscositiesandRefill Capacitieschart.
15.Removethetransmissionbreather.Washthebreatherinclean,nonflammablesolvent.Installthe transmissionbreather.
16.Removethetransfergearhousingbreather.Washthebreatherinclean,nonflammablesolvent. Installthetransfergearhousingbreather.
17.Closetheaccesscover.
18.Startandruntheengineatlowidle.Inspectforleaks.
19.SlowlyoperatetheSTICtransmissioncontrolstocirculatetheoil.
This is the sample of the manual Click on the download link for complete Manual
