Toro Groundsmaster 7210 - PTO Circuit Problems

TractionCircuitProblems(continued)
Notractionexistsineitherdirection.
•Thehydraulic-uidlevelinthehydraulictankislow.
•Thetransmissionbypassvalvesareopen.
•Thechargepressureislow.
•Theengineywheelcouplingisdamaged.
•Thetransmissionorwheelmotor(s)iswornordamaged.
Note:If1tractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
Thewheelmotordoesnotturn.
•Thetransmissionbypassvalve(s)isopen.
•Thetransmissionorwheelmotoriswornordamaged.
Note:If1tractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
ThewheelmotordoesnotholdloadintheNEUTRALposition.
Note:Themachinemaynotbecompletelystationaryif
parkedonaninclinewithouttheparkingbrakeengaged.
•Themake-upuidfromthechargepumpisnotavailable.
•Thecheckvalvesinthetransmissionaredamaged.
•Thevalveplate(s)inthetransmissioniswornordamaged.
•Thewheelmotoriswornordamaged.
•Thecylinderblockassemblyinthetransmission
iswornordamaged.
Asingle-wheelmotorturnswhileunloaded,but
slowsdownorstopswhentheloadisapplied.
•Thewheelmotoriswornordamaged.
•Thetransmissioncomponents(e.g.,piston
pump,reliefvalve,andcheckvalve)forthe
problemwheelmotorarewornordamaged.
Note:If1tractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
Themachinedoesnottrackstraight.
Note:Ifthemachinedoesnottrackstraight,lookfora
problemwiththecomponentsthataffecttheweakertraction
sideofthemachine.
•Theexternaltractioncontrollinkageisincorrectly
adjusted,disconnected,binding,ordamaged.
•Thetransmissionbypassvalve(s)isopen.
•Thebrakeisdraggingorbinding.
•Thetransmission-checkvalveisnotseatingordamaged.
•Thetransmissionorwheelmotor(s)iswornordamaged.
PTOCircuitProblems
Problem
PossibleCauses
Thecuttingdeckbladesdonotturn.
•Anelectricalproblemexists;refertoChapter5:
ElectricalSystem(page5–1).
•Theenginecoolanttemperatureishigh.
•Thetransmissionsolenoidvalveisstuck.
•Thetransmissionchargepumpisdamaged
(thetractionchargecircuitisalsoaffected).
•Thetransmissionpressurevalveisdamaged.
•Thereisaproblemwiththecuttingdeck;
refertoChapter7:CuttingDeck(page7–1).
Thecuttingdeckblade(s)turntooslowly.
•Theenginespeedistoolow.
•Thereisaproblemwiththecuttingdeck;
refertoChapter7:CuttingDeck(page7–1).
ThePTOdoesnotstopwhendisengaged.•Anelectricalproblemexists;refertoChapter5:
ElectricalSystem(page5–1).
•Thetransmissionsolenoidvalveisstuckordamaged.
•ThePTObrakefrictionplatesarewornordamaged.
Groundsmaster7210
Page4–29
HydraulicSystem:Troubleshooting
16222SLRevC