Toro Groundsmaster 4500-D Series - Page 149

Note:Thetractionchargecircuitisdesignedtoreplacelossofhydraulicuid
fromtheclosedlooptractioncircuit.
ProcedureforTractionCircuitChargePressureTest
CAUTION
Preventpersonalinjuryand/ordamagetoequipment.Readall
WARNINGS,CAUTIONSandPrecautionsforHydraulicTestingatthe
beginningofthissection.
1.Makesurehydraulicoilisatnormaloperatingtemperaturebyoperating
themachineforapproximatelyten(10)minutes.Makesurethehydraulic
reservoirisfull.
2.Parkmachineonalevelsurfacewiththecuttingdecksloweredandoff.Make
surehydraulicoilisatnormaloperatingtemperature,engineisOFF ,the
parkingbrakeisengagedandthehydraulicreservoirisfull.
g308252
Figure60
1.Tractionpump
3.Diagnostictesttting
2.Tractionchargeport
3.Raisehoodandlocatepiston(traction)pumpchargeportplugontopof
pump(Figure60).Thoroughlypumpsurfacesaroundplugtopreventsystem
contamination.
4.Removeplugfrompumptractionchargeportandtheninstalldiagnostictest
tting(KLinepartnumber59-7410)intochargeport.
5.Connecta70bar(1000PSI)pressuregaugeontodiagnostictesttting.
6.Starttheengineandincreaseenginespeedtohighidlespeedwithnoload
onthehydraulicsystem.
GAUGEREADINGTOBE13.8to20.6bar(200to300PSI).
7.Stopengineandrecordtestresults.
8.Ifthereisnopressureorpressureislow,checkforthefollowing:
A.Restrictioningearpumpintakeline.
B.Chargereliefvalveinpistonpumpisleaking(seePiston(Traction)Pump
Service(page5–107)).
C.Ifnecessary,checkforinternalwearordamageinthethirdgearpump
section(seeGearPumpFlow(UsingT esterwithPressureGauge&Flow
Meter)(page5–82)).
Groundsmaster
®
4500-D/4700-D
Page5–47
HydraulicSystem:Testing
19245SLRevA