Toro Groundsmaster 4500-D Series User Manual

TractionCircuitProblems
Note:Whentroubleshootingtractioncircuitproblems,ifaproblemexistsinboth
low(mow)andautospeeds,considerafaultycomponentthataffectstheentire
tractioncircuit(e.g.chargecircuit,tractioncircuitreliefvalves,pistonpump).
IftheproblemexistsinLOWspeed(mow)butnotinAutospeed,considera
problemthatonlyexistsinmow(e.g.swashplatecomponentsinfrontwheelor
rearaxlemotor,solenoidvalveintwospeedshiftmanifold).
Problem
PossibleCause
Machineoperatesinonedirectiononly.
Piston(traction)pumpby−passvalveisopen
ordamaged.
Tractionreliefvalveisleakingorfaulty.
Piston(traction)pumpservocontrolvalve
oricesorscreensarepluggedordamaged.
ProblemwithTECoutputtopiston(traction)
pumpservocontrolexists(seeChapter6:
ElectricalSystem(page6–1)).
Tractionpedalresponseissluggish.Tractionpedalcomponentsarestuckor
binding.
Tractionchargepressureislow.
Piston(traction)pumpservocontrolvalve
oricesarepluggedordamaged.
Machinetravelstoofarbeforestoppingwhen
thetractionpedalisreleased.
Tractionpedalcomponentsarestuckor
binding.
Tractionchargepressureislow.
Piston(traction)pumpservocontrolvalve
oricesarepluggedordamaged.
Tractionpowerislostormachinewillnot
operateineitherdirection.
Hydraulicreservoiroillevelislow(Other
hydraulicsystemsareaffectedaswell).
Piston(traction)pumpby-passvalveisopen
ordamaged.
Tractionchargepressureislow.
Tractioncircuitpressureislow.
Tractionpedalpositionsensorisnotplugged
inorisfaulty(seeChapter6:ElectricalSystem
(page6–1)).
ProblemwithTECoutputtopiston(traction)
pumpservocontrolexists(seeChapter6:
ElectricalSystem(page6–1)).
LOWtractionspeed(mow)willnotengage.
Electricalproblemexiststhatpreventssolenoid
valveintwospeedshiftmanifoldfrombeing
de-energized(seeChapter6:Electrical
System(page6–1)).
Note:LOW(mow)willnotengagewhenthe
cuttingdecksarelowered.
Solenoidvalveintwospeedshiftmanifoldis
faulty.
LOWtractionspeed(mow)willnotdisengage.
Electricalproblemexiststhatpreventssolenoid
valveintwospeedshiftmanifoldfrombeing
energized(seeChapter6:ElectricalSystem
(page6–1)).
Solenoidvalveintowspeedshiftmanifoldis
faulty.
Troubleshooting:Page3–4
Groundsmaster
®
4500-D/4700-D
19245SLRevA

Toro Groundsmaster 4500-D Series Specifications

General

Brand	Toro
Model	Groundsmaster 4500-D Series
Category	Lawn Mower
Language	English