Toro Greensmaster 3120 - Chapter 4: Hydraulic System

Chapter4
HydraulicSystem
TableofContents
Specications.......................................................................................................................................4–3
HydraulicSystem...............................................................................................................................4–3
GeneralInformation..............................................................................................................................4–4
TractionUnitOperator’sManual........................................................................................................4–4
RelievingPressurefromtheHydraulicSystem..................................................................................4–4
TowingtheTractionUnit.....................................................................................................................4–5
TractionCircuit(ClosedLoop)ComponentFailure.............................................................................4–6
HydraulicHoses.................................................................................................................................4–7
InstallingHydraulicHosesandTubes(O-RingFaceSeal).................................................................4–8
InstallingtheHydraulicFittings(SAEStraightThreadO-RingFittings).............................................4–10
HydraulicSchematics..........................................................................................................................4–13
HydraulicFlowDiagrams.....................................................................................................................4–15
TractionCircuit.................................................................................................................................4–15
LiftCircuit.........................................................................................................................................4–17
MowCircuit......................................................................................................................................4–20
SteeringCircuit................................................................................................................................4–24
SpecialTools.......................................................................................................................................4–26
HydraulicPressureTestingKit.........................................................................................................4–26
HydraulicTesterKit..........................................................................................................................4–26
HydraulicTestFittingKit...................................................................................................................4–27
O-RingKit........................................................................................................................................4–28
HydraulicHoseKit...........................................................................................................................4–28
MeasuringContainer.......................................................................................................................4–28
HighFlowHydraulicFilterKit...........................................................................................................4–29
Troubleshooting...................................................................................................................................4–30
GeneralHydraulicSystemProblems...............................................................................................4–30
TractionCircuitProblems.................................................................................................................4–31
MowCircuitProblems......................................................................................................................4–32
Lift/LowerCircuitProblems..............................................................................................................4–33
SteeringCircuitProblems................................................................................................................4–34
TestingtheHydraulicSystem..............................................................................................................4–35
HydraulicTestSelection...................................................................................................................4–37
TractionCircuitT esting–ChargePressureTest...............................................................................4–38
TractionCircuitTesting–WheelMotorEfciencyT est......................................................................4–44
TractionCircuitT esting–TractionPump(P1)FlowandReliefPressureTest....................................4–47
CuttingUnitCircuitT esting–CuttingUnitMotorEfciency/CaseDrainT est.....................................4–50
CuttingUnitCircuitT esting–ReliefValveT est.................................................................................4–53
CuttingUnitCircuitT esting–GearPump(P2)FlowTest..................................................................4–56
Steering/LiftCircuitTesting–GearPump(P3)FlowandCircuitReliefValve
Test..................................................................................................................................................4–59
Steering/LiftCircuitT esting–LoweringCuttingUnitsReliefValveTest.............................................4–63
Steering/LiftCircuitT esting–SteeringControlValveandSteeringCylinderT est..............................4–67
Adjustments........................................................................................................................................4–70
AdjustingReliefValves.....................................................................................................................4–70
ServiceandRepairs...........................................................................................................................4–71
GeneralPrecautionsforRemovingandInstallingtheHydraulicSystemComponents......................4–71
CheckingtheHydraulicLinesandHoses.........................................................................................4–73
FlushingtheHydraulicSystem.........................................................................................................4–74
Greensmaster3120
Page4–1
HydraulicSystem
17230SLRevC