Toro Groundsmaster 4300-D - Cooling System Maintenance; Cooling System Safety; Checking and Cleaning Cooling System

Chapter4
HydraulicSystem
TableofContents
Specications.......................................................................................................................................4–3
HydraulicSystem...............................................................................................................................4–3
GeneralInformation..............................................................................................................................4–4
CheckingtheHydraulicFluid.............................................................................................................4–4
PushingorT owingtheTractionUnit...................................................................................................4–5
ReleasingPressurefromtheHydraulicSystem.................................................................................4–6
TractionCircuitComponentFailure....................................................................................................4–7
HydraulicHoses.................................................................................................................................4–8
InstallingtheHydraulicHoseandTube(O-RingFaceSealFitting).....................................................4–9
InstallingtheHydraulicFittings(SAEStraightThreadO-RingFittingintotheComponent
Port).................................................................................................................................................4–11
HydraulicSchematics..........................................................................................................................4–15
HydraulicFlowDiagrams.....................................................................................................................4–16
TractionCircuits...............................................................................................................................4–17
MowCircuit......................................................................................................................................4–20
MowCircuitCuttingDeckBladeBraking..........................................................................................4–22
LiftCylinderCircuit:RaisetheCuttingDecks...................................................................................4–25
LiftCylinderCircuit:LowertheCuttingDecks..................................................................................4–27
SteeringCircuit................................................................................................................................4–30
SpecialTools.......................................................................................................................................4–31
HydraulicPressureTestingKit.........................................................................................................4–31
15GPMHydraulicTesterKit(PressureandFlow)............................................................................4–31
40GPMHydraulicT ester(PressureandFlow).................................................................................4–32
HydraulicHoseKit...........................................................................................................................4–33
O-RingKit........................................................................................................................................4–33
HighFlowHydraulicFilterKit...........................................................................................................4–34
HydraulicTestFittingKit...................................................................................................................4–34
SpindlePlug.....................................................................................................................................4–35
WheelHubPuller.............................................................................................................................4–35
MeasuringContainer........................................................................................................................4–36
RemoteStarterSwitch.....................................................................................................................4–36
Troubleshooting...................................................................................................................................4–39
GeneralHydraulicSystemProblems...............................................................................................4–39
TractionCircuitProblems.................................................................................................................4–40
MowCircuitProblems......................................................................................................................4–41
Lift/LowerCircuitProblems..............................................................................................................4–42
SteeringCircuitProblems................................................................................................................4–43
TestingtheHydraulicSystem..............................................................................................................4–44
TestingtheTractionCircuit–ChargePressure..................................................................................4–46
TestingtheTractionCircuit–WheelMotorEfciency.........................................................................4–49
TestingtheTractionCircuit–PistonPump/HydrostatFlowandReliefPressure.................................4–55
TestingtheMowCircuit–CircuitPressure.........................................................................................4–59
TestingtheMowCircuit–DeckMotorEfciency/CaseDrain.............................................................4–62
TestingtheMowCircuit–ReliefValve(PRV1)and(PRV2)Pressure.................................................4–65
TestingtheMowCircuit–GearPump(P1)and(P2)Flow..................................................................4–69
TestingtheSteeringCircuit–SteeringControlValve,ReliefValve(R10)Pressure,andSteering
Cylinder............................................................................................................................................4–72
TestingtheSteeringCircuit–GearPump(P3)Flow..........................................................................4–75
Groundsmaster
®
4300-D
Page4–1
HydraulicSystem
16226SLRevC