Toro Groundmaster Series - Chapter 5: Hydraulic System

Chapter5
HydraulicSystem
TableofContents
GeneralInformation..............................................................................................................................5–3
TractionUnitOperator’sManualandAccessoryInstallationInstructions............................................5–3
RelievingPressurefromtheHydraulicSystem..................................................................................5–3
TowingtheTractionUnit.....................................................................................................................5–4
TractionCircuitComponentFailure....................................................................................................5–5
HydraulicHoses.................................................................................................................................5–6
InstallingHydraulicHosesandTubes(O-RingFaceSealFitting).......................................................5–7
InstallingtheHydraulicFittings(SAEStraightThreadO-RingFittings)...............................................5–9
HydraulicSchematics..........................................................................................................................5–12
HydraulicFlowDiagrams.....................................................................................................................5–13
TractionCircuit.................................................................................................................................5–13
SteeringCircuit................................................................................................................................5–16
LiftCircuit.........................................................................................................................................5–18
AuxiliaryValveCircuit(Optional)......................................................................................................5–20
TestingtheHydraulicSystem..............................................................................................................5–22
HydraulicTestSelection...................................................................................................................5–24
TestingtheTractionCircuit–ChargePressure................................................................................5–25
TestingtheTractionCircuit–WheelMotorEfciency.......................................................................5–29
TestingtheTractionCircuit–Piston(traction)Pump(P1)FlowandReliefPressure.........................5–37
TestingtheSteeringandLiftCircuit–GearPump(P2)FlowandCircuitRelief
Valve................................................................................................................................................5–40
TestingtheSteeringandLiftCircuit–SteeringCylinderandCircuitReliefValve...............................5–45
TestingtheSteeringandLiftCircuit–LiftCylinderInternalLeakage.................................................5–47
Adjustments........................................................................................................................................5–50
AdjustingtheTractionSystemforNeutral........................................................................................5–50
ServiceandRepairs...........................................................................................................................5–52
GeneralPrecautionsforRemovingandInstallingtheHydraulicSystemComponents......................5–52
CheckingtheHydraulicLinesandHoses.........................................................................................5–54
FlushingtheHydraulicSystem.........................................................................................................5–55
FilteringtheClosed-loopTractionCircuit.........................................................................................5–57
PrimingtheHydraulicPumps...........................................................................................................5–60
ChargingtheHydraulicSystem........................................................................................................5–62
HydraulicTank.................................................................................................................................5–64
HydraulicFluidCooler......................................................................................................................5–66
TractionPumpDrive........................................................................................................................5–67
Piston(traction)Pump(P1)..............................................................................................................5–70
ServicingtheTraction(piston)Pump(P1)........................................................................................5–73
GearPump(P2)...............................................................................................................................5–75
GearPump(P2)Service..................................................................................................................5–78
WheelMotors...................................................................................................................................5–82
WheelMotorService........................................................................................................................5–86
HydraulicManifold...........................................................................................................................5–88
HydraulicManifoldService...............................................................................................................5–90
CartridgeValveService....................................................................................................................5–93
SteeringControlValve.....................................................................................................................5–95
SteeringControlValveService.........................................................................................................5–97
SteeringCylinder.............................................................................................................................5–98
SteeringCylinderService...............................................................................................................5–101
Groundsmaster
®
3200,3300and3310
Page5–1
HydraulicSystem
19240SLRevA