Toro Greensmaster 3120 - Traction Circuit Problems

TractionCircuitProblems
Problem
PossibleCauses
Thehydraulicuidisverycold.
Thetransmissionbypassvalve(s)isopenordamaged.
Thebrakeisdraggingorbinding.
Thetractionpumpreliefvalvesareleakingordamaged.
Thechargepressureislow;refertoChargePressureRelief
ValvePressureT estintheTestingsectionofthischapter.
Thetractionresponseissluggish.
Thetractionpumporwheelmotor(s)iswornordamaged.
Note:Ifatractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
Theexternalcontrollinkageisincorrectlyadjusted,
disconnected,binding,ordamaged.
Theoriceinthetractionpumpcheckvalve(s)isplugged.
Neutralisdifculttondormachineoperatesinonedirection
only.
Thetractionpumpiswornordamaged.
Thebrakesareappliedorareincorrectlyadjusted.
Thehydraulic-uidlevelinthehydraulictankislow(other
hydrauliccircuitperformanceisaffectedaswell).
Thetransmissionbypassvalveisopen.
Thechargepressureislow;refertoChargePressureRelief
ValvePressureT estintheTestingsectionofthischapter.
Notractionexistsineitherdirection.
Thetractionpumporwheelmotor(s)iswornordamaged.
Note:Ifatractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
Brakesarebinding.
Keyonwheelmotorshaftisshearedormissing.
Thewheelmotordoesnotturn.
Thewheelmotoriswornordamaged.
Note:Ifatractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
Themake-upuidfromthechargepumpisnotavailable.
Thecheckvalvesinthetransmissionaredamaged.
Whileonlevelground,thewheelmotordoesnotholdloadin
theNEUTRALposition.
Thetractionpumpreliefvalvesareleakingordamaged.
Note:Thepiston(traction)pumpusedonGreensmaster3120machinesisequippedwithreliefvalves
forboththeforwardandreversedirection.Duetoengineoutput,itisunlikelythattractionpressurewill
reachreliefvalvesettings.If,however,apistonpumpreliefvalveisleakingorotherwisefaulty,traction
performancewouldbeaffected.
Greensmaster3120
Page4–31
HydraulicSystem:Troubleshooting
17230SLRevC