Toro Groundsmaster 4500-D Series - Page 180

ProcedureforLift/LowerCircuitReliefPressureTest(continued)
6.Whileremainingontheseat,depressrearofliftswitch(raise)toallow
lift/lowercircuitpressuretoincrease.Momentarilyholdtheswitchwiththelift
cylindersfullyretractedwhilelookingatthepressuregaugeasthelift/lower
reliefvalveopens.
GAUGEREADINGTOBEapproximately110bar(1600PSI)higherthan
measuredlift/lowercircuitpressurewithnoloadfromstep5above(e.g.if
circuitnoloadpressureis21bar(300PSI),lift/lowerreliefpressureshould
beapproximately131bar(1900PSI)).
7.Releasetheliftswitchandstoptheengine.Recordtestresults.
8.Ifspecicationisnotmet,adjustorcleanreliefvalvelocatedintheliftcontrol
manifold(seeLiftControlManifold(page5–155)).
A.Ifpressureistoohigh,adjustthereliefvalve(seeAdjustControlManifold
ReliefValves(page5–86)).
B.Ifpressureistoolow,checkforrestrictioningearpumpintakeline.
Checktheliftcylindersforinternalleakage.Ifpumpintakelineisnot
restrictedandliftcylindersarenotleaking,adjustthereliefvalve(see
AdjustControlManifoldReliefValves(page5–86)).
C.Ifpressureisstilltoolowafterreliefvalveadjustment,pumpP4orlift
cylinder(s)shouldbesuspectedofwearordamage.
9.Lowerandsecureseataftertestingiscompleted.
HydraulicSystem:Testing
Page5–78
Groundsmaster
®
4500-D/4700-D
19245SLRevA