Toro 30308 - Testing the Traction Circuit-Hydraulic Pump Flow and Relief Pressure (Machine Serial Numbers above 316000000)

TestingtheTractionCircuit–HydraulicPumpFlowandRelief
Pressure(MachineSerialNumbersabove316000000)
g224776
Figure69
Thehydraulicpumpowtestisthesecondinaseriesoftestsrecommended
todeterminethetractioncircuitperformance.Thistestcomparesuidowat
NoLoadwithuidowUnderLoad.Adropinowunderloadofmorethan
12%indicatesaninternalleakormalfunctioningreliefvalveinthehydraulic
pump.Thenaltractioncircuittestisverifyingthehydraulicpumpreliefvalve
operation.Awornhydraulicpumpormalfunctioningreliefvalveislessef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
®
3280-D/3320
05138SLRevB