Toro Groundsmaster 4300-D - Troubleshooting; General Hydraulic System Problems

Troubleshooting
Thefollowingchartcontainssuggestionsthatcanbeusedtosolveperformance
issuesspecictothehydraulicsystem.Thesuggestionsarenotall-inclusive.
Therecanbemorethan1causeforamachinemalfunction.
ReviewthehydraulicschematicfoundinAppendixA—FoldoutDrawingsand
informationonthehydraulicsystemoperationintheHydraulicFlowDiagrams
(page4–16).Thisinformationwillbeusefulduringthehydraulictroubleshooting
process.
RefertoT estingtheHydraulicSystem(page4–44)forprecautionsandspecic
hydraulictestprocedures.
GeneralHydraulicSystemProblems
Problem
PossibleCauses
Thehydraulicuidisleakingfromthesystem.•Thetting(s),hose(s),ortube(s)arelooseordamaged.
•TheO-ring(s)orseal(s)aremissingordamaged.
Thehydraulicuidfoamsexcessivelycausinguidleakage
fromthehydraulictankbreather.
Note:Someaerationofthehydraulicuidonthismachine
isnormal.Thisaeration(foaming)maybemorenoticeable
afterinitialllingofhydraulictank.
•Thehydraulic-uidlevelinthehydraulictankislow.
•Thehydraulicsystemhasawrongtypeofuid.
•Oneofthepumpsuctionlineshasanairleak.
•Incompatiblehydraulicuidsaremixedinthesystem.
•Thereiswaterinthehydraulicsystem.
Thehydraulicsystemoperateshot.•Thetractionsystempressureishighduetoloadordragging
brakes.
•Thehydraulic-uidlevelinthehydraulictankisloworthe
inletlterislooseorclogged.
•Thehydraulicuidiscontaminatedortheuidviscosity
istoolight.
•Theoilcoolerisdamagedorplugged.
•Theoilcoolerairowisobstructed.
•Thepiston(traction)pumpbypassvalveisopenor
damaged.
•Thegearpumpreliefvalveisstuckopen.
•Thepiston(traction)pumpcheckvalveisnotseatingor
isdamaged.
•Thechargepressureislow.
•Thepiston(traction)pumporwheelmotor(s)iswornor
damaged.
•EngineRPMistoolow.
Note:If1tractioncircuitcomponenthasinternalwearor
damage,itispossiblethattheothertractioncomponents
arealsodamaged.
Groundsmaster
®
4300-D
Page4–39
HydraulicSystem:Troubleshooting
16226SLRevC