Service Manual

Troubleshooting
Thefollowingchartscontainsinformationtotroubleshoothydrauliccircuit
problems.Therecanbemorethan1causeforamachinemalfunction.
RefertoT estingtheHydraulicSystem(page4–52)forprecautionsandspecic
hydraulictestprocedures.
GeneralHydraulicSystemProblems
Problem
PossibleCauses
Thehydraulicsystemoperateshot.•Theenginespeedistoolow.
•Thehydraulic-uidlevelinthereservoirislow.
•Thehydraulicuidiscontaminatedoristhewrongtype.
•Thebrakesareappliedortheydonotmovefreely.
•Thepistonpumpby-passvalveisopenordamaged.
•Thecoolingsystemdoesnotoperatecorrectly.
•Thechargepressureislow.
•Thetractioncircuitpressureisincorrect.
•Thepump(s)ormotor(s)aredamaged.
Thehydraulicuidinthereservoirfoams.•Thehydraulicreservoiruidlevelislow.
•Thewrongtypeofuidisinthehydraulicsystem.
•Thereareairleaksinthesuctionline.
Thehydraulicuidisleaking.•Thetting(s),hose,ortubeislooseordamaged.
•AnO-ringismissingordamaged.
HydraulicSystem:Troubleshooting
Page4–48
Groundsmaster5900TractionUnit
08159SLRevC