Toro Groundsmaster 4300-D - Page 107

IMPORTANT
Use2peopletoperformallthetests,with1personintheseatand
theothertoreadandrecordthetestresults.
1.Cleanthemachinefullybeforeyoudisconnectordisassemblethehydraulic
components.
Note:Cleanlinessisrequiredwheneveryouworkonthehydraulic
equipment.Contaminationcausestoomuchwearonhydrauliccomponents.
2.Whenyouperformtestsonthehydraulicsystem,weareyeprotection.
3.Beforeyouperformatest,checkthetractioncontrolleverlinkagesfor
improperadjustment,binding,orbrokenparts.
4.Performallthehydraulictestswiththehydraulicuidatnormaloperating
temperature.
5.Installcleanmetalcapsorplugsonthehydrauliclinesthatareleftopenor
exposedduringthetestingorcomponentremoval.
6.Whenyouuseahydraulictester(pressureandow),ensurethattheinletand
outlethosesareproperlyconnectedandnotreversedtopreventdamaging
thehydraulictesterorcomponents.
7.Installthehydraulicttingsbyhandandensurethattheyarenot
cross-threadedbeforeyoutightenthemwithawrench.
8.Positionthetesterhosestopreventtherotatingmachinepartsfrom
contactinganddamagingthehosesortester.
9.Afteryouconnectthetestequipment,checkthehydraulic-uidlevelinthe
hydraulictankandensurethatthetankhasthecorrectuidlevel.
10.Whenyouuseahydraulictester(pressureandow),openthetesterload
valvefullybeforeyoustarttheenginetoreducethepossibilityofdamaging
thecomponents.
11.Ensurethattheengineisingoodoperatingconditionbeforeperformingany
hydraulictest.
Note:Useaphototacwhenyouperformahydraulictest.Theenginespeed
canaffecttheaccuracyofthetesterreadings.
12.Ifthereisatractioncircuitproblem,perform1ormoreofthefollowingtests:
Thetractioncircuitreliefvalve(R3)and(R4)pressure,tractioncircuitcharge
pressure,gearpump(P3)ow,frontwheelmotorefciencyand/orpiston
(traction)pumpowtests.
13.Ifthereisaliftcircuitproblem,perform1ormoreofthefollowingtests:lift
reliefvalve(PRV)pressure,gearpump(P4)owand/orliftcylinderinternal
leakagetests.
14.Ifthereisacutting(mow)circuitproblem,perform1ormoreofthefollowing
tests:reliefvalve(PRV1)and(PRV2)pressure,gearpump(P1)and(P2)
owand/ordeckmotorefciencytests.
15.Ifthereisasteeringcircuitproblem,perform1ormoreofthefollowingtests:
steeringreliefvalve(R10)pressure,steeringcylinderinternalleakageand/or
gearpump(P3)owtests.
Groundsmaster
®
4300-D
Page4–45
HydraulicSystem:TestingtheHydraulicSystem
16226SLRevC