Toro Groundsmaster 5900 Series - Traction Circuit Problems

TractionCircuitProblems
Whentroubleshootingtractioncircuitproblems,ifaproblemexistsinbothlow
range(mow)andhighrange(transport)speeds,considerafaultycomponent
thataffectstheentiretractioncircuit(e.g.chargecircuit,tractioncircuitrelief
valves,pistonpump).Iftheproblemexistsinlowrangebutnotinhighrange
(transport),consideraproblemthatonlyexistsinmow(e.g.solenoidvalvein
tractionmanifold,issuewithfrontwheelmotor).
Problem
PossibleCause
Machineoperatesinonedirectiononly
(forwardorreverse).
Tractionreliefvalvefornon−functioning
directionisloose,leakingordamaged.
Oriceorscreeninpiston(traction)pump
controlassemblyisobstructedordamaged.
Tractioncontrolpedalpotentiometerisfaulty
(faultcodeshouldbedisplayedonInfoCenter
Display).
ProblemwithTECoutputtopiston(traction)
pumpservocontrolexists(seeChapter6:
ElectricalSystem(page6–1)).
Tractionoperationissluggish.
Hydraulicreservoiroillevelislow(other
hydraulicsystemsareaffectedaswell).
Enginespeedislow.
Tractioncontrolpedalassemblyisstickingor
binding.
Tractionchargepressureislow.
Oriceorscreeninpiston(traction)pump
controlassemblyisobstructedordamaged.
Pistonpumpservocontrolvalveisdamaged.
Hydraulicowfortractionchargecircuitislow
(steeringandliftcircuitsalsoaffected).
Machinetravelstoofarbeforestoppingwhen
thetractionpedalisreleased.
Tractioncontrolpedalassemblyisbindingor
outofadjustment.
Pistonpumpservocontrolvalveisdamaged.
Tractionpedaldoesnotreturnfullytoneutral.
Tractionpowerislostormachinewillnot
operateineitherdirection.
Hydraulicreservoiroillevelislow(Other
hydraulicsystemsareaffectedaswell).
Piston(traction)pumpby-passvalveisopen
ordamaged.
Tractionchargepressureislow.
Tractioncircuitpressureislow.
Oriceorscreeninpiston(traction)pump
controlassemblyisobstructedordamaged.
Tractioncontrolpedalpotentiometeris
damagedordisconnected(faultcodeshould
bedisplayedonInfoCenterDisplay).
ProblemwithTECoutputtopiston(traction)
pumpservocontrolexists(seeChapter6:
ElectricalSystem(page6–1)).
Hydraulicowfortractionchargecircuitislow
(steeringandliftcircuitsalsoaffected).
Troubleshooting:Page3–4
Groundsmaster
®
5900&5910
16227SLRevB