Toro ProLine H800 - Page 42

GeneralHydraulicSystemProblems(continued)
Problem
PossibleCauseCorrectiveAction
Thehydraulicuidisverycold.Allowthehydraulicuidtowarmby
safelyoperatingthemachineatrest.
Thehydraulicuidlevelinthehydraulic
tankislow.
Adjustthehydraulicuidlevel.
Thetractionpumpbypassvalveisopen
ordamaged.
Closeorreplacethetractionpump
bypassvalve(s).
EngineRPMistoolow.IncreasetheengineRPM.
Thebrakesaredraggingorbinding.
Checkandreplacethebrakepads.
Thehydrostat/hydraulicpumpcheck
valveisnotseatingorisdamaged.
Checkandreplacethecheckvalve.
Thechargepressureislow.
Verifythechargepressure.
Thetractionresponseissluggish.
Thehydrostat/hydraulicpumpisworn
ordamaged.
Verifythetractionpumpoperationand
replaceifnecessary.
Thetractioncontrollinkageis
incorrectlyadjusted,disconnected,
bindingordamaged.
Checkanadjustthetractioncontrol
linkage.
Tractionjerkywhenstarting.
Thehydrostat/hydraulicpumpcheck
valveisnotseatingorisdamaged.
Checkandreplacethecheckvalve.
Thetractioncontrollinkageis
incorrectlyadjusted,disconnected,
bindingordamaged.
Checkanadjustthetractioncontrol
linkage.
Thehydrostat/hydraulicpumpcheck
valveisnotseatingorisdamaged.
Checkandreplacethecheckvalve.
Neutralisdifculttondorunitoperates
inonedirectiononly.
Thehydrostat/hydraulicpumpisworn
ordamaged.
Verifythetractionpumpoperationand
replaceifnecessary.
Thebrakesaredraggingorbinding.
Checkandreplacethebrakepads.
Thehydraulicuidlevelinthehydraulic
tankislow.
Adjustthehydraulicuidlevel.
Thehydrostat/hydraulicpumpcheck
valveisnotseatingorisdamaged.
Checkandreplacethecheckvalve.
Thetractionpumpbypassvalveisopen
ordamaged.
Closeorreplacethetractionpump
bypassvalve(s).
Thechargepressureislow.
Verifythechargepressure.
Thehydrostat/hydraulicpumpisworn
ordamaged.
Verifythetractionpumpoperationand
replaceifnecessary.
Notractionexistsineitherdirectionand
theenginespeedremainsconstant.
Thehydrostat/hydraulicpump
driveshaftorkeydamaged.
Checkandrepairthehydraulicpump.
Anelectricalproblemexistsinthe
solenoidvalvecircuit.
Testandreplacethevalvesolenoidif
necessary.
Thedifferentiallockwillnotengage.
Solenoidvalveinthedifferentialvalve
isleakingorfaulty.
Cleanthesolenoidvalve
andreplacetheseals.
Replacesolenoidvalveifnecessary.
Troubleshooting:GeneralHydraulicSystemProblems
Page3–4
ProLineH800
19241SLRevB