Toro Groundmaster Series - Testing the Traction Circuit - Piston (traction) Pump (P1) Flow and Relief Pressure

TestingtheTractionCircuit–Piston(traction)Pump(P1)Flow
andReliefPressure
g299804
Figure35
TractionCircuit–Piston(traction)Pump(P1)FlowandReliefPressure
Thehydraulicpump(P1)owtestisthethirdinaseriesoftestsrecommended
todeterminethetractioncircuitperformance.ThistestcomparesuidowatNo
LoadwithuidowUnderLoad.Adropinowunderloadofmorethan12%
indicatesaninternalleakormalfunctioningreliefvalveinthehydraulicpump.
Thenaltractioncircuittestisverifyingthehydraulicpumpforwarddirection
reliefvalve(R1)operation.Awornhydraulicpumpormalfunctioningreliefvalve
islessefcient.Eventually,enoughuidbypasswillcausetheunittostall
underheavyloadconditions.Continuedoperationcangenerateexcessiveheat,
causedamagetosealsandothercomponentsinthehydraulicsystem,and
affectoverallmachineperformance.
SpecialEquipmentRequired:
•Flowmeterwithpressuregaugethathasatleasta114L/minute(30
gallons/minute)capacity.
•2HydraulicHoses
TestProcedure
1.Parkthemachineonalevelsurface,lowerthecuttingunit(orattachment),
andsetthekeyswitchtotheOFFposition.
2.ReadandadheretotheinformationprovidedinT estingtheHydraulicSystem
(page5–22).
3.EnsurethatthetractionpedaliscorrectlyadjustedfortheNEUTRALposition;
refertoAdjustingtheTractionSystemforNeutral(page5–50).Also,ensure
Groundsmaster
®
3200,3300and3310
Page5–37
HydraulicSystem:TestingtheHydraulicSystem
19240SLRevA