Toro Groundsmaster 7210 - Hydraulic System and Mower Deck Service

Chapter4
HydraulicSystem
TableofContents
Specications.......................................................................................................................................4–3
GeneralInformation..............................................................................................................................4–4
HydraulicHoses.................................................................................................................................4–4
InstallingtheHydraulicHoseandTube(O-RingFaceSealFitting).....................................................4–5
InstallingtheHydraulicFittings(SAEStraightThreadO-RingFittingintotheComponent
Port)...................................................................................................................................................4–7
TractionUnitOperator'sManual.........................................................................................................4–9
PushingtheTractionUnit.................................................................................................................4–10
ReleasingPressurefromtheHydraulicSystem...............................................................................4–11
TractionCircuit(ClosedLoop)ComponentFailure...........................................................................4–12
HydraulicSchematics..........................................................................................................................4–13
TractionCircuits...............................................................................................................................4–15
LiftCircuit(Raise)............................................................................................................................4–18
LiftCircuit(Lower)............................................................................................................................4–20
PTOCircuit......................................................................................................................................4–22
SpecialTools.......................................................................................................................................4–23
HydraulicPressureTestingKit.........................................................................................................4–23
15GPMHydraulicTesterKit(PressureandFlow)............................................................................4–23
HydraulicTestFittingKit...................................................................................................................4–24
O-RingKit........................................................................................................................................4–24
HighFlowHydraulicFilterKit...........................................................................................................4–25
HydraulicHoseKit...........................................................................................................................4–25
RemoteStarterSwitch.....................................................................................................................4–26
Troubleshooting...................................................................................................................................4–28
GeneralHydraulicSystemProblems...............................................................................................4–28
TractionCircuitProblems.................................................................................................................4–28
PTOCircuitProblems......................................................................................................................4–29
Lift/LowerCircuitProblems..............................................................................................................4–30
TestingtheHydraulicSystem..............................................................................................................4–31
TestingtheTractionSystemOperation............................................................................................4–33
TestingtheChargeReliefValvePressure(UsingPressureGauge)..................................................4–34
TestingtheTransmissionPistonPumpFlow(UsingTesterwithPressureGaugesandFlow
Meter)...............................................................................................................................................4–37
TestingtheTractionReliefValvePressure(UsingTesterwithPressureGaugesandFlow
Meter)...............................................................................................................................................4–40
TestingtheWheelMotorEfciency(UsingTesterwithPressureGaugesandFlow
Meter)...............................................................................................................................................4–43
TestingthePTOPressureValve(UsingPressureGauge)................................................................4–46
TestingtheImplementReliefPressure(UsingPressureGauge)......................................................4–48
TestingtheGearPumpFlow(UsingT esterwithPressureGaugesandFlow
Meter)...............................................................................................................................................4–51
TestingtheLiftCylinderforInternalLeakage....................................................................................4–54
ServiceandRepairs...........................................................................................................................4–57
GeneralPrecautionsforRemovingandInstallingtheHydraulicSystemComponents......................4–57
CheckingtheHydraulicLinesandHoses.........................................................................................4–58
PrimingtheHydraulicPumps...........................................................................................................4–58
FlushingtheHydraulicSystem.........................................................................................................4–59
Groundsmaster7210Page4–1HydraulicSystem
16222SLRevC