Service Manual

TractionSystemProblems(continued)
Problem
PossibleCauseCorrectiveAction
Thehydraulicuidlevelinthehydraulic
tankislow(otherhydrauliccircuit
performanceisaffectedaswell).
Adjustthehydraulicuidlevel.
Thetractionpumpbypassvalve(s)is
openordamaged.
Closeorreplacethetractionpump
bypassvalve(s).
Oneormoreoriceorscreeninpiston
(traction)pumpcontrolassemblyis
partiallyobstructedordamaged.
Cleanorrepairpiston(traction)pump
passages.
Thechargepressureislow(steering
andliftcircuitperformanceisalso
affected).
Verifychargepressure;refertothe
InfoCenterSERVICE–INPUT/OUTPUT
–TRACTION–TRACTIONINPUTS
FRONTTRACTIONandREAR
TRACTIONreadingswhilethemachine
isstationary.
Thetractionpumpchargereliefvalveis
leakingordamaged.
Cleanorrepairthechargereliefvalve.
Problemwiththepiston(traction)pump
controlsolenoidcircuitexists.
Verifytractionpedalsensoroperation
andthemachinewireharnesstraction
pedalcircuit.
VerifytheTECoutputtothepump
controlsolenoidsareoccurring.
Testthemachinewireharnesspump
controlsolenoidcircuits.
Thetractionpumpreliefvalvesare
leakingordamaged.
Cleanorrepairthepiston(traction)
pumpreliefvalves.
Thetractionpumpiswornordamaged.
Verifytractionpumpoperation;referto
TractionPump(P1andP2)Testsin
theHydraulicSystemchapterofthis
manual.
Thedriveaxlemotoriswornor
damaged.
Repairorreplacethedriveaxlemotor.
Notractionexistsineitherdirection.
Note:Ifatractioncircuitcomponent
hasinternalwearordamage,it
ispossiblethattheothertraction
componentsarealsodamaged.
Anelectricalproblemexistsinthe
solenoidvalve(SV1)circuit.
Testandreplacethevalvesolenoidif
necessary.
Testthemachinewireharnesssolenoid
valve(SV1)circuit.
Solenoidvalve(SV1)inthemain
manifoldisleakingorfaulty.
Cleanthesolenoidvalveandreplace
theseals
Highrangetractionspeedwillnot
engage.
Replacesolenoidvalveifnecessary.
Troubleshooting:TractionSystemProblems
Page3–28
Outcross9060
18234SLRevC