Toro Greensmaster 3120 - Lift;Lower Circuit Problems

Lift/LowerCircuitProblems
Problem
PossibleCauses
Hydraulictankuidlevelislow(otherhydrauliccircuits
affectedaswell).
Hydraulicpumpsuctionlineisrestricted.
Gearpump(P1)isnoisy(cavitation).
Hydraulicpumpsuctionlinehasanairleak.
Enginespeedistoolow.
Hydraulictankuidlevelislow.
Liftcylinderlinkageisbindingorbroken.
Liftcylinderbushingsarebindingorworn.
Chargecircuitpressureislow;refertoChargeReliefValve
PressureT estintheT estingsectionofthischapter.
Liftcircuitreliefvalve(insteeringcontrolvalve)isleaking
ordamaged.
Mowermanifoldsolenoidvalve(S2)isleakingordamaged
(notshiftingtoitsenergizedposition).
AnelectricalproblemexistswithsolenoidvalveS2(see
Chapter5–ElectricalSystem).
Reliefvalve(R2)isleakingordamaged.
Theliftcylinder(s)isleakinginternally.
Spoolinsteeringcontrolvalveissticking;refertoSteering
ControlValveT estintheTestingsectionofthischapter.
Cuttingunitswillnotliftorliftslowly.
Gearpump(P1)isdamaged;refertoGearPump(P1)Flow
TestintheT estingsectionofthischapter.
Mowermanifoldsolenoidvalve(S4)leaksorisdamaged. Cuttingunitsraise,butwillnotstayup.
Theliftcylinder(s)isleakinginternally.
Greensmaster3120
Page4–33
HydraulicSystem:Troubleshooting
17230SLRevC