Service Manual

PTOProblems
Problem
PossibleCauses
Thecuttingdecksdonotoperate.
Note:Thedecksmustbefullyloweredandthetraction
speedintheMOWpositionforthedeckstooperate.
•Anelectricalproblemexists;refertotheChapter
5:ElectricalSystem(page5–1).
•Thegearpumpiswornordamaged.
Acuttingdeckmotordoesnotoperate.
•Anelectricalproblemexists;refertotheChapter
5:ElectricalSystem(page5–1).
•Thereisaproblemwiththecuttingdeck;
refertoChapter8:CuttingDecks(page8–1).
•Thesystempressuretotheaffecteddeckmotorislow.
•TheWoodruffkeyontheaffecteddeckmotorisdamaged
(themotorrotatesbutthedeckbeltandbladesdonotrotate).
•ThesolenoidvalveinthedeckPTOcontrol
manifoldisnotfunctioning.
•ThecartridgevalveinthedeckPTOcontrol
manifoldisdamagedordoesnotmovefreely.
•Thedeckmotororgearpumpsectionisdamaged.
Allthecuttingdeckmotorsoperateslowly.•Theenginespeedistoolow.
•Thereisaproblemwiththecuttingdeck;
refertoChapter8:CuttingDecks(page8–1).
•Thedeckmotororgearpumpsectionisdamaged.
Thecuttingdeckstopsunderaload.
•ThereliefvalveinthedeckPTOcontrolmanifoldisbypassed.
•Thereisaproblemwiththecuttingdeck;
refertoChapter8:CuttingDecks(page8–1).
•Thedeckmotorhasinternalleakage(bypasseduid).
•Thecuttingdeckgearpumpsectionisinefcient.
SteeringCircuitProblems
Problem
PossibleCauses
Steeringisofforslow.•Thesteeringcomponents(e.g.,tierods,steering
cylinderends)arewornordonotmovefreely.
•Thesteeringcylinderdoesnotmovefreely.
•Thehydraulic-uidlevelinthereservoiris
low(otherhydraulicsystemsaffectedaswell).
•Thesteering-reliefvalve(RV)inthesteering/cooling
fancontrolvalvedoesnotmovefreelyorisdamaged.
•Theowdivider(FD)inthedeck-liftcontrol
valveisnotfunctioning.
•Theproportionalvalve(PV)inthesteering/cooling
fancontrolvalveisnotfunctioning.
•Thesteeringcylinderleaksinternally.
•Thesteeringcontrolvalveiswornordamaged.
•Thegearpumpsection(P3)iswornordamaged.
Note:Awornordamagedgearpumpsection(P3)affectsthe
traction(charge)andliftcircuits.
HydraulicSystem:Troubleshooting
Page4–50
Groundsmaster5900TractionUnit
08159SLRevC