Service Manual

TractionCircuitProblems
Problem
PossibleCause
Machineoperatesinonedirectiononly.
Piston(traction)pumpby−passvalveisopen
ordamaged.
Tractionreliefvalveisleakingorfaulty.
Piston(traction)pumpservocontrolvalve
oricesorscreensarepluggedordamaged.
ProblemwithTECoutputtopiston(traction)
pumpservocontrolexists(seeChapter6:
ElectricalSystem(page6–1)).
Tractionpedalresponseissluggish.Tractionpedalcomponentsarestuckor
binding.
Tractionchargepressureislow.
Piston(traction)pumpservocontrolvalve
oricesarepluggedordamaged.
Machinetravelstoofarbeforestoppingwhen
thetractionpedalisreleased.
Tractionpedalcomponentsarestuckor
binding.
Tractionchargepressureislow.
Adjustmentofreliefvalve(RV)inreartraction
manifoldisincorrect.
Piston(traction)pumpservocontrolvalve
oricesarepluggedordamaged.
Tractionpowerislostormachinewillnot
operateineitherdirection
Hydraulicreservoiroillevelislow(Other
hydraulicsystemsareaffectedaswell).
Piston(traction)pumpby-passvalveisopen
ordamaged.
Tractionchargepressureislow.
Tractioncircuitpressureislow.
Tractionpedalpositionsensorisnotpluggedin
orisfaulty(seeChapter5−ElectricalSystem).
ProblemwithTECoutputtopiston(traction)
pumpservocontrolexists(seeChapter6:
ElectricalSystem(page6–1)).
LOWtractionspeed(mow)willnotengage.
Electricalproblemexiststhatpreventssolenoid
valveS12frombeingde-energized(see
Chapter6:ElectricalSystem(page6–1))
Note:LOW(mow)willnotengagewhenthe
cuttingdecksarelowered.
Solenoidvalve(S12)incombinationmanifold
isfaulty.
LOWtractionspeed(mow)willnotdisengage.
Electricalproblemexiststhatpreventssolenoid
valveS12frombeingenergized(seeChapter
6:ElectricalSystem(page6–1)).
Solenoidvalve(S12)incombinationmanifold
isfaulty.
Troubleshooting:Page3–4
Groundsmaster
®
4000-D&4010-D
13202SLRevE