Service Manual

Lift/LowerProblem
Problem
PossibleCauses
Thecuttingdeckdoesnotraise.•Theenginespeedistoolow.
•Thehydraulic-uidlevelinthereservoirislow.
•Thelift-armpivotsdonotmovefreely.
•Aliftcylinderisdamaged.
•Thereliefvalveinthelift-controlmanifold
doesnotmovefreely.
•Thepilotvalveinthelift-controlmanifoldisdamaged
ordoesnotmovefreely.
•Theproportionalowdividerinthelift-control
manifoldisnotfunctioning.
•Thegearpumpsectionforthelift-controlmanifold
iswornordamaged.
Thecuttingdeckraises,butdoesnotstayup.
Note:Theliftcylinderscannotgiveafullyperfectseal.The
liftarmsloweraftersometimeiftheyareleftintheraised
positionduringstorage.
•Thelift-circuitlinesorttingsareleaking.
•Aliftcylinderisdamaged.
Thesidecuttingdecklowerstooquickly.
•Theoriceinthelift-controlvalveismissingordamaged.
•Thecheckvalveinthelift-controlvalveisnotfunctioning.
Thesidecuttingdecklowerstooslowly.
•Theoriceinthelift-controlvalveisconnected
ornotfunctioning.
•Thelift-armpivotsdonotmovefreely.
•Aliftcylinderisdamaged.
Thecuttingdeckdoesnotlower.
•Thelift-armpivotsdonotmovefreely.
•Aliftcylinderisdamaged.
•Thecounterbalancepressureistoomuch.
•Thelift-controlvalveiswornordamaged.
•Thepilotvalveinthelift-controlmanifoldis
damagedordoesnotmovefreely.
Groundsmaster5900TractionUnit
Page4–51
HydraulicSystem:Troubleshooting
08159SLRevC