Toro Groundsmaster 4500-D Series - Page 160

ProcedureforRearTractionCircuitReliefValve(RV)PressureTest(continued)
5.Startengineandincreaseenginespeedtohighidlespeed.Makesure
thatAuto/LOWmodeswitchisintheLOW(mow)positionandreleasethe
parkingbrake.
6.Measureandrecordreversetractioncircuitreducingvalve(PR)pressure
(seeReverseTractionCircuitReducingValve(PR)Pressure(UsingPressure
Gauge)(page5–53)).
7.OperatethemachineinLOWspeed(mow)withthecuttingdeckslowered.
Drivedownaslopeinaforwarddirection,decreasepressureonthetraction
pedalandmonitorthepressuregauge.Pressureshouldincreaseuntilthe
reartractioncircuitreliefvalve(RV)lifts.
GAUGEREADINGTOBEapproximately38bar(550PSI)andatleast7
bar(100PSI)higherthanthetractioncircuitpressurereducingvalve(PR)
pressure(e.g.ifthepressurereducingvalve(PR)pressureis31bar(450
PSI),relief(RV)pressureshouldbeatleast38bar(550PSI)butnotmuch
higher).
8.Stopengineandrecordtestresults.
g308370
Figure69
1.Reartractionmanifold3.Relief(RV)valve
2.#6zeroleakplug4.Reducing(PR)valve
9.Thereartractioncircuitreliefvalve(RV)islocatedonthebottomoftherear
tractionmanifold(Figure69).Iftestpressureisincorrect,adjustreliefvalve
(RV)(seeAdjustControlManifoldReliefValves(page5–86)).
10.Whentestingiscompleted,disconnectpressuregaugefromtheinstalled
diagnostictting.Removediagnosticttingfrommanifoldandinstallremoved
plugintomanifold.Torqueplugto34N·m(25ft-lb).
HydraulicSystem:Testing
Page5–58
Groundsmaster
®
4500-D/4700-D
19245SLRevA