Toro 08743 - Page 41

TractionSystemProblems(continued)
Problem
PossibleCauseCorrectiveAction
Theparkingbrakeisengaged.Disengagetheparkingbrake.
Thehydraulicuidlevelinthehydraulic
tankislow(otherhydrauliccircuit
performanceisaffectedaswell).
Adjustthehydraulicuidlevel.
Thetractioncontrollinkageis
incorrectlyadjusted,binding,or
damaged.
Inspecttractionlinkageoperationand
serviceoradjustifnecessary.
Thetractionpumpbypassvalveisopen
ordamaged.
Closeorreplacethetractionpump
bypassvalve.
Thechargepressureislow(lift
circuitperformance,andsteering
circuitperformanceformodel07845
machinesisalsoaffected).
Verifychargepressure;refertoT esting
theTractionCircuit–ChargePressure
intheHydraulicSystemchapterofthis
manual.
Thepiston(traction)pumporpump
reliefvalvesarewornordamaged.
Verifytractionpumpoperation;refer
toTestingtheTractionCircuit–Piston
(traction)Pump(P1)FlowandRelief
PressureT estintheHydraulicSystem
chapterofthismanual.
Thewheelmotor(s)iswornor
damaged.
Verifywheelmotoroperation;referto
TestingtheTractionCircuit–Wheel
MotorEfciencyintheHydraulic
Systemchapterofthismanual.
Notractionexistsineitherdirection.
Note:Ifatractioncircuitcomponent
hasinternalwearordamage,it
ispossiblethattheothertraction
componentsarealsodamaged.
Thechargepressureislow(lift
circuitperformance,andsteering
circuitperformanceformodel07845
machinesisalsoaffected).
Verifychargepressure;refertoT esting
theTractionCircuit–ChargePressure
intheHydraulicSystemchapterofthis
manual.
Thevehiclemoveswhenstoppedona
gentleslope(wheelmotorswillnothold
load)inneutral.
Thepiston(traction)pumporpump
reliefvalvesarewornordamaged.
Verifytractionpumpoperation;refer
toTestingtheTractionCircuit–Piston
(traction)Pump(P1)FlowandRelief
PressureT estintheHydraulicSystem
chapterofthismanual.
Thefrontwheelslipsorspins(rear
wheeltractionisreduced).
ReliefvalveRVisstuckordamaged.
Disassemble,clean,inspectandrepair
orreplacethereliefvalve.
SandPro
®
3040and5040
Page3–7
Troubleshooting:TractionSystemProblems
20251SLRevA