TestingtheTractionCircuit–HydraulicPumpFlowandRelief
Pressure(MachineSerialNumbersabove316000000)
g224776
Figure69
Thehydraulicpumpowtestisthesecondinaseriesoftestsrecommended
todeterminethetractioncircuitperformance.Thistestcomparesuidowat
NoLoadwithuidowUnderLoad.Adropinowunderloadofmorethan
12%indicatesaninternalleakormalfunctioningreliefvalveinthehydraulic
pump.Theîš¿naltractioncircuittestisverifyingthehydraulicpumpreliefvalve
operation.Awornhydraulicpumpormalfunctioningreliefvalveislessefîš¿cient.
Eventually,enoughuidbypasswillcausetheunittostallunderheavyload
conditions.Continuedoperationcangenerateexcessiveheat,causedamageto
sealsandothercomponentsinthehydraulicsystem,andaffectoverallmachine
performance.
SpecialEquipmentRequired:
•Pressuregauge
•Flowmeterwithpressuregaugethathasatleasta114L/minute(30
gallons/minute)capacity.
TestProcedure
1.Warmoilaftertestequipmentisconnectedtopreventtechnicianfrom
workingonahotmachine—applicabletotestswhenpossible(anytestthat
requiresanopenun-pluged/cappedline(casedraintests)wouldnotapply
andoilshouldbewarmedbeforedisconnectingthelines).
HydraulicSystem:TestingtheHydraulicSystem
Page5–62
Groundsmaster
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3280-D/3320
05138SLRevB
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