Toro Groundsmaster 4500-D Series - Traction Circuit Component Failure

TractionCircuitComponentFailure
ThetractioncircuitonGroundsmaster4500−Dand4700−Dmachinesisa
closedloopsystemthatincludesthepiston(traction)pump,two(2)frontwheel
motorsandtherearaxlemotor.Ifacomponentinthetractioncircuitshouldfail,
debrisandcontaminationfromthefailedcomponentwillcirculatethroughoutthe
tractioncircuit.Thiscontaminationcandamageothercomponentsinthecircuit
soitmustberemovedtopreventadditionalcomponentfailure.
Therecommendedmethodofremovingtractioncircuitcontaminationwouldbe
totemporarilyinstalltheTorohighowhydrauliclter(seeSpecialT ools(page
2–16))intothecircuit.Thisltershouldbeusedwhenconnectinghydraulictest
gaugesinordertotesttractioncircuitcomponentsorafterreplacingafailed
tractioncircuitcomponent(e.g.traction(piston)pumporwheelmotor).Thelter
willensurethatcontaminatesareremovedfromtheclosedloopandthus,donot
causeadditionalcomponentdamage.
OncetheTorohighowhydrauliclterkithasbeenplacedinthecircuit,raise
andsupportthemachinewithallwheelsofftheground.Then,operatethe
tractioncircuittoallowoilowthroughoutthecircuit.Thelterwillremove
contaminationfromthetractioncircuitduringoperation.BecausetheToro
highowlterisbi−directional,thetractioncircuitcanbeoperatedinboththe
forwardandreversedirection.Theltershouldberemovedfromthemachine
aftercontaminationhasbeenremovedfromthetractioncircuit.SeeFiltering
Closed−LoopTractionCircuit(page5–93)foradditionalinformationonusingthe
Torohighowhydrauliclter.
ThealternativetousingtheT orohighowhydrauliclterkitafteratractioncircuit
componentfailurewouldbetodisassemble,drainandthoroughlycleanall
components,hydraulictubesandhydraulichosesinthetractioncircuit.Ifany
debrisremainsinthetractioncircuitandthemachineisoperated,thedebriscan
causeadditionalcircuitcomponentfailure.
Groundsmaster
®
4500-D/4700-D
Page5–5
HydraulicSystem:GeneralInformation
19245SLRevA