Toro Groundmaster Series - Page 125

TestProcedure(continued)
C.Recordthetesterpressureandowreadings.
11.VerifythepumpowUnderLoadasfollows:
A.SlowlypressthetractionpedaltofullyFORWARDposition.
B.Applyanadditionalloadof8,274to12,410kPa(1,200to1,800psi)
byslowlyclosingtheowmeter.
C.Recordthetesterpressureandowreadingsunderload.
12.Verifythetractionreliefvalve(R1)operationasfollows:
A.WiththetractionpedalintheNEUTRALposition,fullyclosetheowmeter
owcontrolvalve.
B.SlowlypressthetractionpedaltowardtheFORWARDposition.
C.Thesystempressureshouldreach25,682to26,096kPa(3,725to3,785
psi)beforethereliefvalveopens.Recordthetesterpressurereading.
Note:Thereliefvalvesettingis22,925kPa(3,625psi).Anadditional
690to1,100kPa(100to160psi)isnecessarytoovercomesystem
chargepressurebeforethereliefvalveopens.
D.Releasethetractionpedal,opentheowcontrolvalvefully,movethe
throttletolowspeed,andsetthekeyswitchtotheOFFposition.
13.Ifthereliefpressurecannotbemetorisgreaterthanspecied,thetraction
reliefvalveisdamagedandshouldbereplaced.
14.Theunderloadtestowreading(step11)shouldnotdropmorethan12%
whencomparedtothenoloadtestowreading(step10).Adifferenceof
morethan12%(UnderLoad>NoLoadX0.88)mayindicatethehydraulic
pumpiswornandshouldbereplacedorrepaired;refertoPiston(traction)
Pump(P1)(page5–70)orServicingtheTraction(piston)Pump(P1)(page
5–73).
15.Aftertesting:
A.Removethehydraulichosesandtester.
B.Installthehydraulictubepreviouslyremoved.
C.Removethejackstandsandlowerthemachinetotheground.
D.Checkandadjustthelevelofthehydraulicuidinthehydraulicreservoir;
refertothetractionunitOperator’sManual.
E.Starttheengineandcheckforanyhydraulicuidleaks.Repairhydraulic
leaksifnecessarybeforereturningthemachinetoservice.
Groundsmaster
®
3200,3300and3310
Page5–39
HydraulicSystem:TestingtheHydraulicSystem
19240SLRevA