Toro Greensmaster 3120 - Page 94

TractionCircuitTesting–TractionPump(P1)FlowandRelief
PressureTest(continued)
Thetractionpumpowtestisthethirdinaseriesoftestsrecommendedto
determinetractioncircuitperformance.Thenaltractioncircuittestisverifying
thetractionpumpreliefvalveoperation.Thetractionpumpowtestcompares
uidowatNoLoadwithuidowUnderLoad.Adropinowunderload
ofmorethan12%indicatesaninternalleakormalfunctioningreliefvalvein
thetractionpump.Aworntractionpumpormalfunctioningreliefvalveisless
efcient.Eventually,enoughuidby−passwillcausetheunittostallunder
heavyloadconditions.Continuedoperationcangenerateexcessiveheat,cause
damagetosealsandothercomponentsinthehydraulicsystem,andaffect
overallmachineperformance.
SpecialEquipmentRequired:
•FlowMeterwithPressureGaugethathasatleasta57LPM(15GPM)
capacity.
•Phototach(non−contacttachometer).
1.Parkmachineonalevelsurface.TheengineshouldbeOFF .
2.ReadandadheretotheinformationprovidedinT estingtheHydraulicSystem
(page4–35).
3.Makesurethattractionpedalisadjustedtotheneutralposition.
WARNING
ReviewandfollowJackingInstructions(page1–7)beforejacking
upthemachine.
4.Raisebothfrontwheelsofftheoorandsupportthemachine.
g215375
Figure34
1.Tractionpump
2.Hosefromtractionpump“A”port
HydraulicSystem:TestingtheHydraulicSystem
Page4–48
Greensmaster3120
17230SLRevC