Service Manual

ProcedureforRearTractionCircuitReliefValve(RV)PressureTest
Note:Adjustablereliefvalve(RV)inthereartractioncontrolmanifoldreduces
rearaxlemotorpressurecreatedindownhill,dynamicbrakingconditionsto
preventrearwheellockup.
CAUTION
Preventpersonalinjuryand/ordamagetoequipment.Readall
WARNINGS,CAUTIONSandPrecautionsforHydraulicTestingatthe
beginningofthissection.
Note:Ifthereartractioncircuitreducingvalve(PR)pressureisexcessive,
operationofthereartractionreliefvalve(RV)maybeaffected.Beforeadjusting
reartractionreliefvalve(RV),makesurethatpressurereducingvalve(PR)
pressureiscorrect.
1.Parkmachineonalevelsurfacewiththecuttingdecksloweredandoff.
Makesurehydraulicoilisatnormaloperatingtemperature,engineisoffand
theparkingbrakeisapplied.
Note:Thistestusesthesamepressuregaugepositionasusedtomeasure
reversetractioncircuitreducingvalve(PR)pressure.
Note:The#6zeroleakplugontheinsideofreartractionmanifoldisazero
leakplugthathasataperedsealingsurfaceontheplughead.Lightlyrap
theplugheadusingapunchandhammerbeforeusinganallenwrench
toremovetheplug:theimpactwillallowplugremovalwithlesschanceof
damagetothesocketheadoftheplug.
2
1
3
4
g275059
Figure66
1.Reartractionmanifold3.Relief(RV)valve
2.#6zeroleakplug4.Reducing(PR)valve
2.Locatereartractionmanifoldthatisattachedtothefrontframenexttothe
leftsidefrontwheel(Figure66).Remove#6zeroleakplugoninsideofrear
tractionmanifoldandinstalldiagnostictting(T oropartnumber59−7410)
intomanifoldport.
3.Connecta70bar(1000PSI)pressuregaugewithhydraulichoseattached
toinstalleddiagnostictting.
4.Startengineandincreaseenginespeedtohighidlespeed.Makesurethat
HI/LOWswitchisintheLOW(mow)positionandreleasetheparkingbrake.
5.OperatethemachineinLOWspeed(mow)withthecuttingdeckslowered.
Drivedownaslopeinaforwarddirection,decreasepressureonthetraction
HydraulicSystem:Testing
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Groundsmaster
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4100-D&4110-D
13203SLRevF