TestingtheTractionCircuit–ChargePressure(MachineSerial
Numbersabove316000000)
g224775
Figure67
TestProcedure
Thechargepressuretestistheîš¿rstinaseriesoftestsrecommendedto
determinetractioncircuitperformance.Achargepressuredropofmorethan
20%indicatesaninternalleakinthehydraulicpump.Continuedunitoperation
cangenerateexcessiveheat,causedamagetosealsandothercomponentsin
thehydraulicsystem,andaffectoverallmachineperformance.
SpecialEquipmentRequired:Pressuregauge
1.Warmoilaftertestequipmentisconnectedtopreventtechnicianfrom
workingonahotmachine—applicabletotestswhenpossible(anytestthat
requiresanopenun-pluged/cappedline(casedraintests)wouldnotapply
andoilshouldbewarmedbeforedisconnectingthelines).
CAUTION
Beforeopeningthehydraulicsystem,operateallthehydraulic
controlstoreleasesystempressureandavoidinjuryfromthe
pressurizedhydraulicuid;refertoReleasingPressurefromthe
HydraulicSystem(page5–6).
2.ParkthemachineonalevelsurfacewiththePTOswitchoff,lowerthecutting
deck,shutofftheengine,andsettheparkingbrake.
Groundsmaster
®
3280-D/3320
Page5–59
HydraulicSystem:TestingtheHydraulicSystem
05138SLRevB
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