Toro Groundsmaster 4300-D - Testing the Traction Circuit-Piston Pump;Hydrostat Flow and Relief Pressure

TestingtheTractionCircuit–PistonPump/HydrostatFlowand
ReliefPressure
g192623
Figure59
Thehydrostatowtestisthethirdinaseriesoftestsrecommendedtodetermine
thetractioncircuitperformance.ThistestcomparesuidowatNoLoadwith
uidowUnderLoad.Adropinowunderloadofmorethan12%indicatesan
internalleakormalfunctioningreliefvalveinthepistonpump/hydrostat.The
naltractioncircuittestisverifyingthehydrostatreliefvalveoperation.Aworn
hydrostatormalfunctioningreliefvalveislessefcient.Eventually,enough
uidbypasswillcausetheunittostallunderheavyloadconditions.Continued
operationcangenerateexcessiveheat,causedamagetosealsandother
componentsinthehydraulicsystem,andaffectoverallmachineperformance.
SpecialEquipmentRequired:
•Pressuregauge
•Flowmeterwithpressuregaugethathasatleasta114L/minute(30
gallons/minute)capacity.
Groundsmaster
®
4300-D
Page4–55
HydraulicSystem:TestingtheHydraulicSystem
16226SLRevC