Toro Groundsmaster 4300-D - Page 141

TestProcedure
1.Ensurethatthehydraulicuidisatnormaloperatingtemperatureby
operatingthemachineforatleast10minutes.
2.ParkthemachineonalevelsurfacewiththePTOswitchoff,lowerthecutting
decks,shutofftheengine,mowspeedlimiterisintheMOWposition,and
settheparkingbrake.
3.ReadallWarning,Cautions,andprecautionslistedatthebeginningofthis
section.
g217321
Figure74
1.PRVsolenoid
3.Liftcontrolmanifold
2.T estport(G4)
4.Cleanthetestport(G4)onthebottomofliftcontrolmanifold,andthen
connecta35,000kPa(5,000psi)pressuregaugetothetestport(Figure74).
5.Afterinstallingthepressuregaugetothemanifoldtestport,starttheengine
andrunitatlow-idlespeed.Checkforhydraulic-uidleaksfromthetest
connectionsandcorrectbeforecontinuingthetest.
6.Presstheenginespeedswitchtofullspeed(3,005to3,055rpm)position.
UsetheInfoCentertocheckthattheenginespeediscorrect.
IMPORTANT
Donotallowthepressuretoexceed17,500kPa(2,500psi).
IMPORTANT
Whenperformingthistest,holdthejoystickleverintheRAISE
position,onlylongenoughtogetasystempressurereading.
HoldingtheleverinRAISEforanextendedperiodmaydamage
systemcomponents.
7.EnsurethatthePTOswitchisOFF,andthenpullthejoystickleverrearward
topressurizetheliftcircuit.WhileholdingleverintheRAISE(rearward)
position,monitorthepressuregaugecarefully.
8.Whenthecuttingdecksreachthefullyraisedpositionandtheliftreliefvalve
lifts,thesystempressureshouldbeapproximately13,800kPa(2,000psi).
9.ReturnthejoysticklevertotheNEUTRALposition,andshutofftheengine.
Groundsmaster
®
4300-D
Page4–79
HydraulicSystem:TestingtheHydraulicSystem
16226SLRevC