Toro Reelmaster 3100-D - Traction Circuit Testing − Piston Pump;Hydrostat (P3) Flow and Relief Pressure Test

TractionCircuitTesting−PistonPump/Hydrostat(P3)Flowand
ReliefPressureTest
g345006
Figure44
Model03171(shown)
Thehydrostatowtestisthethirdinaseriesoftestsrecommendedtodetermine
tractioncircuitperformance.Thenaltractioncircuittestisverifyingthehydrostat
reliefvalveoperation.ThistestcomparesuidowatNoLoadwithuidow
UnderLoad.Adropinowunderloadofmorethan12%indicatesaninternal
leakormalfunctioningreliefvalveinthepistonpump/hydrostat.Awornhydrostat
ormalfunctioningreliefvalveislessefcient.Eventually,enoughuidby−pass
willcausetheunittostallunderheavyloadconditions.Continuedoperationcan
generateexcessiveheat,causedamagetosealsandothercomponentsinthe
hydraulicsystem,andaffectoverallmachineperformance.
SpecialEquipmentRequired:
•PressureGauge
•FlowMeterwithPressureGaugethathasatleastan68LPM(18GPM)
capacity
•Phototach(non−contacttachometer)
1.Parkmachineonalevelsurfacewiththecuttingunitsloweredandthereel
engage/disengageswitchinthedisengageposition.Theengineshouldbe
offandtheparkingbrakeengaged.
2.ReadPrecautionsforHydraulicT esting(page5–27).
3.Makesurethatthetractionpedalisadjustedtotheneutralposition.
Reelmaster
®
3100-D/3105-D
Page5–37
HydraulicSystem:Testing
20252SLRevA