Product:MOTORGRADER
Model:120GMOTORGRADER4HD
Configuration:120GMotorGrader4HD00001-UP(MACHINE)POWEREDBY3304Engine
OperationandMaintenanceManual 120GAND130GMOTORGRADERS
MediaNumber-SEBU6052-00PublicationDate-01/04/1988DateUpdated-21/05/2010
TireInflationInformation
NitrogenInflationInformation
Standbehindthetreadwheninflatingatire.
Propernitrogeninflationequipmentandtraininginitsuseare necessarytoavoidoverinflation.Atireblowoutorrimfailurecanresult fromimproperormisusedequipment.
Caterpillarrecommendsusingdrynitrogen(N2)gasforbothtireinflationandtirepressure adjustmentsonallrubbertiredmachines.Nitrogenisaninertgasandwillnotsupportcombustion insidethetire.
Inadditiontoreducingtheriskofanexplosion,usingnitrogeninsteadofairtoinflatetireslessens theslowoxidationoftherubberandtheaccompanyinggradualtiredeterioration.Thisis especiallyimportantfortiresthathaveanexpectedlongservicelife(fourormoreyears).Italso reducesthecorrosionofrimcomponentsandtheresultantdisassemblyproblems.
AdjustedInflationPressures
Atireinflatedinanenclosedshopareaatatemperatureof18°to21°C(65°to70°F),willbe underinflatedifthemachineworksinfreezingtemperatures.Lowtirepressureshortensthelifeof atire.
Whenoperatinginfreezingtemperatures,consulttheColdWeatherRecommendationsOperation andMaintenanceGuide,FormSEBU5898,foradjustedinflationpressures.
Setthetireinflationequipmentregulatoratnomorethan140kPa(20psi)overtherecommended tirepressure.
UsetheCaterpillarPart6V4040NitrogenInflationGroup,orequivalent,toinflatetiresfroma nitrogengascylinder.SeeSpecialInstruction,FormSMHS7867,fortireinflationinstructions.
Usethesametirepressuresfornitrogeninflationaswouldbeusedforairinflation.
ShippingPressures
NOTICE
Thechartsshownareforshippingpressuresonly.Consultyourtire dealerforoperatingpressures.
Theinflationpressuresshowninthefollowingchartsarecoldinflationshippingpressuresfortires onCaterpillarmachines.Pressuresforeachapplicationwillvaryfromthoseshownandshould alwaysbeobtainedfromyourtiresupplier. 120G
NOTE:The"R"intiresizedenotesradialconstruction.
Copyright1993-2025CaterpillarInc. AllRightsReserved. PrivateNetworkForSISLicensees.
TueApr2209:23:27UTC+05302025
Product:MOTORGRADER
Model:120GMOTORGRADER4HD
Configuration:120GMotorGrader4HD00001-UP(MACHINE)POWEREDBY3304Engine
OperationandMaintenanceManual 120GAND130GMOTORGRADERS
MediaNumber-SEBU6052-00PublicationDate-01/04/1988DateUpdated-21/05/2010
TransportationHints
Shipping
NOTICE
Removeice,snoworotherslipperymaterialfromshippingmachine andloadingdock,beforeloadingthemachine.
1.Blockthetrailerorrailcarwheelsbeforeloading.
2.Setthebladelengthwiseunderthemachine.Lowerallraisedequipment.Movethetransmission controllevertoNEUTRAL.Engagetheparkingbrake.
3.Installthewheelleanlockpin.
4.Installtheframelockpin.
5.Blockthewheelsandsecurethemachinewithtie-downs.
6.Covertheexhaustopeningtopreventturbocharger"windmilling"intransit.
7.Tiporcovertheseattoprotectthecushion.
8.Turnthekeystartswitchoffandremovethekey.
9.Lockallpossiblecompartments.
10.Infreezingweather,makecertainthatthecoolingsystemisprotectedwithantifreezetothe lowestexpectedoutsidetemperatureorisdrainedcompletely.
11.Checkregulationscoveringthetransportationofcylinderscontainingcompressedgas(blade accumulator).
Roading
NOTICE
Inspectthemachinethoroughlybeforeroading. Whenroading,reducethegroundspeedbeforedownshifting.
BesurethecentershiftlockpinleverisintheINDEXandRUNposition.
1.Measuretheenginecrankcaseoillevel.MaintaintheoillevelbetweentheADDandFULL marksontheENGINERUNNINGsideofthedipstick.
2.Measurethetransmissionanddifferentialoillevel.WiththeenginerunningatLOWIDLEand atoperatingtemperature,maintaintheoilleveltotheFULLmarkonthedipstick.
3.Measurethetandemdrivehousing'soillevel.Addoilifnecessary.
4.Measurethefuellevel.Addfuelifnecessary.
5.Observetheenginecoolantlevel.Maintainthecoolantlevelabovethelevelindicatorplatein thebottomofthefillpipe.
6.Measurethetireinflationpressure.Inspectthetiresfordamage.See"TireInflation Information."
7.Cleanthewindshield,sideandrearglass.
8.Cleanalllightsandreflectors.
9.Makecertaintheheadlights,taillights,turnsignalsandhazardwarninglightsfunctionproperly.
10.Makecertainthatthesteeringfunctionsproperly.
11.Makecertainthebrakesfunctionproperly.
12.Makecertainallthecontrols,indicatorsandgaugesfunctionproperly.
13.Haveafireextinguisher,flaresandsafetyreflectorswiththemachine.
14.Obeyalltrafficregulations.
15.Ifanyoftheindicatorscomeon,stopthemachine.Investigateandcorrectthecause.
16.Stopevery80km(50miles)or2hours,for30minutes.Inspectthemachineandallowthe machinepartstocool.
17.Whentravelinglongdistances,lubricatethemachineatrecommendedintervals.
18.Ifnecessarytoleavethemachineunattended:
a.Lowerthebladeandimplements.
b.MovethetransmissioncontrollevertoNEUTRAL.
c.Engagetheparkingbrake.
d.Pulltheacceleratoruppastthedetenttostoptheengine.TurnthekeystartswitchtoOFFand removekey.
e.Atnight,setoutflaresand/orsafetyreflectors.
Copyright1993-2025CaterpillarInc. AllRightsReserved. PrivateNetworkForSISLicensees.
TueApr2209:22:55UTC+05302025
Product:MOTORGRADER
Model:120GMOTORGRADER4HD
Configuration:120GMotorGrader4HD00001-UP(MACHINE)POWEREDBY3304Engine
OperationandMaintenanceManual 120GAND130GMOTORGRADERS
MediaNumber-SEBU6052-00PublicationDate-01/04/1988DateUpdated-21/05/2010
ParkingtheMachine
StoppingtheMachine
Iftheservicebrakefails,themachinecanbestoppedwiththeparking brakebymanuallymovinglever(1)totheparkposition.Thebrake fullyapplies,therefore,bepreparedforasuddenstop.
1.Reducetheenginespeed.
2.Applytheservicebraketostopthemachine.
3.Movetransmissioncontrollever(2)toNEUTRAL.Applyparkingbrake(1).
4.Iftheengineistobestopped,setthegovernorcontrollever(3)tohalfspeed.
5.Lowerthebladetotheground.Applyaslightdownpressure.
StoppingtheEngine
Stoppingtheengineimmediatelyafterithasbeenworkingunderload canresultinoverheatingandacceleratedwearoftheengine components.Followthestoppingprocedure,outlinedbelow,toallow theenginetocoolandtopreventexcessivetemperaturesinthe turbochargercenterhousingthatwillcauseoilcokingproblems.
1.Withthemachinestopped,operatetheengineatLOWIDLEforfiveminutes.
2.Pulltheacceleratoruppastthedetent,tostoptheengine.
3.TurnthekeystartswitchtoOFFandremovethekey.
Whenparkingthemachine,thekeystartswitchmustbeOFFandthe centershiftlockpinintheINDEXandRUNposition.
Copyright1993-2025CaterpillarInc. AllRightsReserved. PrivateNetworkForSISLicensees.
TueApr2209:22:24UTC+05302025
This is the sample of the manual Click on the download link for complete Manual
Product:MOTORGRADER
Model:120GMOTORGRADER4HD
Configuration:120GMotorGrader4HD00001-UP(MACHINE)POWEREDBY3304Engine
OperationandMaintenanceManual 120GAND130GMOTORGRADERS
MediaNumber-SEBU6052-00PublicationDate-01/04/1988DateUpdated-21/05/2010
ExtendingMoldboard
2.Loosentheboltssecuringthecylinderrodendbrackettothemoldboard.Removetheboltsand lockwashers.
3.Retractthecylinderrod.
4.Aligntheboltholesinthebracketwiththealternateholesinthemoldboard.
5.Installthelockwashers,boltsandtightenthebolts.
ScarifierDiggingAngle
1.Toadjustthediggingangle,lowerthescarifiertotheground.
2.Removethebracketboltsonbothsidesofthescarifier.
3.Raiseorlowerthescarifiertosettheangle.
4.Installthebracketbolts.
CentershiftCylinderExtension
Installation(TypicalExample)
Beforedisconnectingthecylinder,supportittopreventitfrom droppingandcausingpossiblepersonalinjury.
1.Starttheengineandslightlyextendthecentershiftcylinderrod.
2.Lowerthemoldboardandapplyaslightdownpressure.Stoptheengine.
3.Removetheboltsfromthecapandremovethecap.
4.Movethecylinderawayfromtheballstud.
5.Installthecentershiftextensionlinkwithspacers.Installlockwashers,nutsandbolts.
6.Removethesupportusedtoholdthecentershiftcylinder.
Installationofacentershiftcylinderextensionlinkisnecessarytoallow2:1bankslopecutsonthe rightsideofthemachineonly.Also,anycleanupworkrequiredcanbeaccomplished.Forother operations,removethecentershiftcylinderextensionlinkandattachtherodendofthecylinderto theballstudonthelinkbar.
NOTICE
Interferenceispossibleatthefollowinglocations.
Linkbaroverlaponthedrawbarcrossbeam.
Drawbarmayinterferewiththescarifiermounting.
Extensionlinksmayinterferewiththepinpullerhousing.
Removal
NOTICE
Usecaretopreventdamagetothecentershiftcylinderrod.
1.Useablockorstraptosupportthecentershiftcylinder.
2.Removetheboltsandthelockwashersfromthecentershiftextensionlink.Removethelink.
3.Movethecylinderintowardstheballstudandalignthestudandthecylinderrod.
4.Installthecapandthebolts.
TueApr2209:21:59UTC+05302025
Product:MOTORGRADER
Model:120GMOTORGRADER4HD
Configuration:120GMotorGrader4HD00001-UP(MACHINE)POWEREDBY3304Engine
OperationandMaintenanceManual 120GAND130GMOTORGRADERS
MediaNumber-SEBU6052-00PublicationDate-01/04/1988DateUpdated-21/05/2010
OperatingTechniques
ChangingGearSpeedandDirection
Donotoperatethemachinewithoutnormalairpressure.
Beforeoperatingthemachineoritsimplementsinanydirection,make surethatnooneisendangered.
Fastentheseatbeltbeforeoperatingthemachine. Besuretogroundmoldboardbeforeretractingcentershiftlockpin.
Keeptransmissionengagedwhengoingdownhill.Donotcoast.
Donotpushdownthetransmissionmodulatorpedalwhengoing downhill.
1.Cycleallthecontrolsandcheckthemforproperoperation.
2.MovegovernorcontrollevertotheLOWIDLEposition.
3.Depresstransmissionmodulatorpedal(1).
4.Raiseallimplements.
5.Applyservicebrake(2).
6.Releaseparkingbrake(3).
7.Movetransmissionlever(4)totheleftorright,forthedirectionoftraveldesired.Selectthe desiredspeedtomovethemachine.(Normally2ndor3rdspeed.)
8.Releasethetransmissionmodulatorpedal.
9.Depressacceleratortoobtainthedesiredspeed.
10.Upshiftonespeedatatime.Increasetheenginespeedasnecessary.
NOTICE
Topreventpossibledamagetothemachine,reducegroundspeed beforedownshifting.
11.Downshiftonegearatatime.Whendownshiftingunderaload,increasetheenginespeedto matchtheratioofthelowergearspeed.
12.Tochangethedirectionoftravel,stopthemachineusingtheservicebrake.Movethe transmissioncontrollevertoNEUTRAL,thentothedirectionandgeardesired.
Speedanddirectionalchangesatfullenginespeedarepossible.However,foroperatorcomfort andmaximumservicelifeofpowertraincomponents,themodulatorpedaland/orservicebrake canbeusedwhenfirstmovingthemachineorwhenmakingdirectionalchanges.
