Toro Groundsmaster 4500-D Series User Manual

Chapter5
HydraulicSystem
TableofContents
GeneralInformation..............................................................................................................................5–3
Operator’sManual.............................................................................................................................5–3
CheckHydraulicFluid........................................................................................................................5–3
TowingTractionUnit...........................................................................................................................5–3
RelievingHydraulicSystemPressure................................................................................................5–4
TractionCircuitComponentFailure....................................................................................................5–5
HydraulicHoses.................................................................................................................................5–6
InstallingHydraulicHosesandTubes(O-RingFaceSeal).................................................................5–7
InstallingtheHydraulicFittings(SAEStraightThreadO-RingFittings)...............................................5–9
HydraulicSchematic............................................................................................................................5–12
HydraulicFlowDiagrams.....................................................................................................................5–14
TractionCircuit:LOWMode.............................................................................................................5–15
TractionCircuit:AutoMode.............................................................................................................5–17
LowerCuttingDecks:Groundsmaster4500-D................................................................................5–20
LowerCuttingDecks:Groundsmaster4700-D................................................................................5–23
RaiseCuttingDecks:Groundsmaster4500-D.................................................................................5–26
RaiseCuttingDecks:Groundsmaster4700-D.................................................................................5–29
MowCircuit......................................................................................................................................5–32
CuttingDeckBladeBraking.............................................................................................................5–35
SteeringCircuit................................................................................................................................5–37
EngineCoolingFanCircuit..............................................................................................................5–40
Testing.................................................................................................................................................5–43
PrecautionsforHydraulicT esting.....................................................................................................5–43
WhichHydraulicT estsAreNecessary?............................................................................................5–44
TractionCircuitChargePressure(UsingPressureGauge)..............................................................5–46
TractionCircuitReliefPressure(UsingPressureGauge).................................................................5–49
ReverseTractionCircuitReducingValve(PR)Pressure(UsingPressureGauge)............................5–53
RearTractionCircuitRelief(RV)Pressure(UsingPressureGauge)................................................5–56
Piston(Traction)PumpFlow(UsingTesterwithPressureGauge&FlowMeter)...............................5–59
CuttingDeckCircuitPressure(UsingPressureGauge)...................................................................5–62
CuttingDeckCircuitReliefPressure(UsingTesterwithPressureGauge&Flow
Meter)...............................................................................................................................................5–65
DeckMotorCaseDrainLeakage(UsingT esterwithPressureGauge&Flow
Meter)...............................................................................................................................................5–68
SteeringCircuitReliefPressure(UsingPressureGauge)................................................................5–71
SteeringCylinderInternalLeakage..................................................................................................5–74
Lift/LowerCircuitReliefPressure(UsingPressureGauge)..............................................................5–76
EngineCoolingFanCircuit(UsingPressureGaugeandPhototac)..................................................5–79
GearPumpFlow(UsingT esterwithPressureGauge&FlowMeter)................................................5–82
ProcedureforGearPumpFlowT est................................................................................................5–83
Adjustments........................................................................................................................................5–86
AdjustControlManifoldReliefValves...............................................................................................5–86
ServiceandRepairs...........................................................................................................................5–87
GeneralPrecautionsforRemovingandInstallingHydraulicSystemComponents...........................5–87
CheckHydraulicLinesandHoses...................................................................................................5–89
PrimingHydraulicPumps.................................................................................................................5–90
FlushHydraulicSystem...................................................................................................................5–91
FilteringClosed−LoopTractionCircuit.............................................................................................5–93
Groundsmaster
®
4500-D/4700-D
Page5–1
HydraulicSystem
19245SLRevA

Toro Groundsmaster 4500-D Series Specifications

General

Brand	Toro
Model	Groundsmaster 4500-D Series
Category	Lawn Mower
Language	English