Toro 08761 Service Manual

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(Model08745)........................................................................................................5–16
LiftCircuit.........................................................................................................................................5–19
RearRemoteHydraulicCircuit(Optional)........................................................................................5–21
SwitchKitHydraulicCircuit(Optional)..............................................................................................5–22
TestingtheHydraulicSystem..............................................................................................................5–23
HydraulicTestSelection...................................................................................................................5–26
TestingtheTractionCircuit–ChargePressure................................................................................5–27
TestingtheTractionCircuit–WheelMotorEfciency.......................................................................5–31
TestingtheTractionCircuit–TractionPump(P1)FlowandReliefPressure.....................................5–36
TestingtheLiftandSteeringCircuit–Implement/ChargePump(P2)FlowandCircuit
Relief................................................................................................................................................5–40
TestingtheSteeringCircuit(Model08745only)–SteeringCylinderInternal
Leakage...........................................................................................................................................5–44
TestingtheLiftCircuit–LiftCylinderInternalLeakage.....................................................................5–46
TestingtheOptionalAttachmentCircuit–AttachmentPump(P3)FlowandCircuit
Relief................................................................................................................................................5–48
Adjustments........................................................................................................................................5–51
AdjustingtheTractionSystemforNeutral........................................................................................5–52
ServiceandRepairs...........................................................................................................................5–54
GeneralPrecautionsforRemovingandInstallingtheHydraulicSystemComponents......................5–54
CheckingtheHydraulicLinesandHoses.........................................................................................5–56
FlushingtheHydraulicSystem.........................................................................................................5–57
FilteringtheClosed-loopTractionCircuit.........................................................................................5–59
PrimingtheHydraulicPumps...........................................................................................................5–63
ChargingtheHydraulicSystem........................................................................................................5–64
HydraulicTank.................................................................................................................................5–66
HydraulicFluidCooler......................................................................................................................5–68
Piston(traction)Pump......................................................................................................................5–70
ServicingthePiston(traction)Pump................................................................................................5–74
WheelMotors...................................................................................................................................5–76
ServicingtheWheelMotors.............................................................................................................5–81
TractionReliefManifold...................................................................................................................5–83
RearLiftReliefManifold(Model08743)...........................................................................................5–85
ServicingaHydraulicCartridgeValve..............................................................................................5–87
LiftControlValve..............................................................................................................................5–89
ServicingtheLiftControlValve........................................................................................................5–92
RearLiftCylinder.............................................................................................................................5–94
SandPro
®
3040and5040
Page5–1
HydraulicSystem
20251SLRevA

Toro 08761 Specifications

General

Brand	Toro
Model	08761
Category	Tractor
Language	English