Toro Groundsmaster 4500-D Series - Page 174

ProcedureforSteeringCircuitReliefPressureTest
Thesteeringcircuitreliefpressuretestshouldbeperformedtomakesurethat
thesteeringcircuitreliefpressureiscorrect.
CAUTION
Preventpersonalinjuryand/ordamagetoequipment.Readall
WARNINGS,CAUTIONSandPrecautionsforHydraulicTestingatthe
beginningofthissection.
1.Makesurehydraulicoilisatnormaloperatingtemperaturebyoperating
themachineforapproximatelyten(10)minutes.Makesurethehydraulic
reservoirisfull.
2.Parkmachineonalevelsurfacewiththecuttingdecksloweredandoff.Make
sureengineisoffandtheparkingbrakeisengaged.
g308483
Figure83
1.Steeringcylinder3.Barrelendtting
2.Barrelendhose4.Rearaxle
3.Thoroughlycleanjunctionofhydraulichoseandsteeringcylinderttingat
thebarrelendofthesteeringcylinder(Figure83).Disconnecthosefrom
ttinginbarrelendofsteeringcylinder.
4.Install350bar(5000PSI)pressuregaugewithhydraulichoseattachedto
disconnectedhose.Installsteelcaponsteeringcylinderttingtoprevent
anyleakagefromcylinder.
5.Afterinstallingpressuregauge,startengineandrunatlowidlespeed.Check
forhydraulicleakageandcorrectbeforeproceedingwithtest.
6.Increaseenginespeedtohighidlespeed.
IMPORTANT
Whiletesting,rotatesteeringwheelonlylongenoughtogetasystem
reliefpressurereading.Holdingthesteeringcircuitatreliefpressure
foranextendedperiodmaydamagethesteeringcontrolvalve.
7.Turnsteeringwheeltotherightwhilemonitoringthepressuregauge.When
steeringcircuitpressurereachesthereliefpressuresetting,pressureshould
HydraulicSystem:Testing
Page5–72
Groundsmaster
®
4500-D/4700-D
19245SLRevA