Toro Groundsmaster 4500-D Series - Lift Circuit Problems

LiftCircuitProblems
Problem
PossibleCause
Cuttingdeckswillnotraise.
EngineRPMistoolow.
Hydraulicoillevelinreservoirislow(NOTE:
Otherhydraulicsystemsareaffectedaswell).
Electricalproblemexists(seeChapter6:
ElectricalSystem(page6–1)).
Note:Seatmustbeoccupiedinordertoraise
thecuttingdecks.
Liftarmpivotsarebinding.
Lift/lowercircuitreliefvalveinliftcontrol
manifoldisstuckopen.
Solenoidvalveinliftcontrolmanifoldis
damagedorsticking.
Liftcylinder(s)is(are)damaged.
Flowdivider(FD)infancontrolmanifoldis
faulty.
Thethirdgearpumpsectioniswornor
damaged(NOTE:Awornordamagedthird
gearpumpsectionwillalsoaffectthetraction
chargeandsteeringcircuits).
Cuttingdecksraise,butwillnotstayup.Liftcircuithydrauliclinesorttingsareleaking.
Cartridgevalveinliftcontrolmanifoldisstuck
open.
Note:Liftcylinderscannotprovidean
absolutelyperfectseal.Acuttingdeckwill
eventuallylowerifleftintheraisedposition
duringstorage.
Liftcylinderforaffecteddeckisdamaged.
Cuttingdeckswillnotlower.Liftarmpivotsarebinding.
EngineRPMistoolow.
Electricalproblemexists(seeChapter6:
ElectricalSystem(page6–1)).
Proportionalreliefcartridgevalve(TS)inlift
controlmanifoldisdamagedorsticking.
Liftcylinderforaffecteddeckisdamaged.
Troubleshooting:Page3–8
Groundsmaster
®
4500-D/4700-D
19245SLRevA