Toro Groundmaster Series - Cutting Unit (or Attachment) Lift;Lower Problems

CuttingUnit(orattachment)Lift/LowerProblems
Problem
PossibleCauseCorrectiveAction
Enginespeedistoolow.Increaseenginespeed.
Liftarmsarebinding,wornordamaged.Inspectliftcomponentsandrepairor
replaceifnecessary.
Thehydraulicuidlevelinthehydraulic
tankislow(otherhydrauliccircuit
performanceisaffectedaswell).
Adjustthehydraulicuidlevel.
Anelectricalproblemexistsinthe
solenoidvalve(SV1)circuit.
Testthesolenoidvalvecoil(SV1)and
replaceifnecessary.
Testthemachinewireharnesssolenoid
valve(SV1)circuit.
Solenoidvalve(SV1)inthemain
manifoldisstuck,leakingorfaulty.
Cleanthesolenoidvalveandreplace
theseals.
Replacethesolenoidvalveifnecessary.
Reliefvalve(R4)inthesteeringcontrol
valveisfaulty.
Verifyreliefvalve(R4)operation;refer
toTestingtheSteeringandLiftCircuit
–SteeringCylinderandCircuitRelief
ValveintheHydraulicSystemchapter
ofthismanual.
Liftcylindercircuitpressureislow
(tractionchargeandsteeringcircuits
affectedaswell).
Verifychargepressure;refertoT esting
theTractionCircuit–ChargePressure
intheHydraulicSystemchapterofthis
manual.
Liftcylinderswillnotraiseorraise
slowly.
Verifygearpump(P2)performance;
refertoT estingtheSteeringandLift
Circuit–GearPump(P2)Flowand
CircuitReliefValveintheHydraulic
Systemchapterofthismanual.
Solenoidvalve(SV2)inthemain
manifoldisstuck,leakingorfaulty.
Cleanthevalveandreplacetheseals.
Replacethevalveifnecessary.
Liftcylindersraisebutwillnotstayup.
NOTE:Liftcylinderscannotprovidean
absolutelyperfectseal.Theliftarms
willeventuallylowerifleftsupporting
anattachmentintheraisedposition
duringstorage.
Aliftcylinderisleakinginternally.
Testandrepairorreplacethehitch
cylinderifnecessary.
Anelectricalproblemexistsinthe
solenoidvalve(SV2)circuit.
Testthesolenoidvalvecoil(SV2)and
replaceifnecessary.
Testthemachinewireharnesssolenoid
valve(SV2)circuit.
Solenoidvalve(SV2)inthemain
manifoldisstuck,leakingorfaulty.
Cleanthesolenoidvalveandreplace
theseals.
Liftcylinderswillnotlower.
Replacethesolenoidvalveifnecessary.
Troubleshooting:CuttingUnit(orattachment)Lift/Lower
Problems
Page3–20
Groundsmaster
®
3200,3300and3310
19240SLRevA