Toro Groundsmaster 4500-D Series - Page 159

ProcedureforRearTractionCircuitReliefValve(RV)PressureTest
Note:Adjustablereliefvalve(RV)inthereartractioncontrolmanifoldreduces
rearaxlemotorpressurecreatedindownhill,dynamicbrakingconditionsto
preventrearwheellockup.
CAUTION
Preventpersonalinjuryand/ordamagetoequipment.Readall
WARNINGS,CAUTIONSandPrecautionsforHydraulicTestingatthe
beginningofthissection.
Note:Ifthereartractioncircuitpressurereducingvalve(PR)pressureis
excessive,operationofthereartractionreliefvalve(RV)maybeaffected.Before
adjustingreartractionreliefvalve(RV),makesurethatpressurereducingvalve
(PR)pressureiscorrect.
1.Makesurehydraulicoilisatnormaloperatingtemperaturebyoperating
themachineforapproximatelyten(10)minutes.Makesurethehydraulic
reservoirisfull.
2.Parkmachineonalevelsurfacewiththecuttingdecksloweredandoff.Make
sureengineisoffandtheparkingbrakeisengaged.
Note:Thistestusesthesamepressuregaugepositionasusedtomeasure
tractioncircuitpressurereducingvalve(PR)pressure.
Note:The#6zeroleakplugontheinsideofreartractionmanifoldisazero
leakplugthathasataperedsealingsurfaceontheplughead.Lightlyrap
theplugheadusingapunchandhammerbeforeusinganallenwrench
toremovetheplug:theimpactwillallowplugremovalwithlesschanceof
damagetothesocketheadoftheplug.
g308369
Figure68
1.Frontframe2.Reartractionmanifold
3.Locatereartractionmanifoldthatisattachedtothefrontframenexttothe
leftsidefrontwheel(Figure68).Remove#6zeroleakplugoninsideofrear
tractionmanifoldandinstalldiagnostictting(T oropartnumber59-7410)
intomanifoldport.
4.Connecta70bar(1000PSI)pressuregaugewithhydraulichoseattached
toinstalleddiagnostictting.
Groundsmaster
®
4500-D/4700-D
Page5–57
HydraulicSystem:Testing
19245SLRevA