Toro 31222 - The Safety Interlock System; Understanding the Diagnostic Light

TheSafetyInterlockSystem
CAUTION
Ifthesafetyinterlockswitchesaredisconnectedor
damagedthemachinecouldoperateunexpectedly
causingpersonalinjury.
•Donottamperwiththeinterlockswitches.
•Checktheoperationoftheinterlockswitches
dailyandreplaceanydamagedswitchesbefore
operatingthemachine.
UnderstandingtheSafetyInterlock
System
Thesafetyinterlocksystemisdesignedtopreventtheengine
fromstartingunless:
•Youaresittingontheseatortheparkingbrakeisengaged.
•Thepowertakeoff(PTO)isdisengaged.
•Thetractionpedalisintheneutralposition
•Theenginetemperatureisbelowthemaximumoperating
temperature.
Thesafetyinterlocksystemalsoisdesignedtostoptheengine
whenthetractionpedalismovedfromtheneutralposition
withtheparkingbrakeengaged.Ifyourisefromtheseat
whenthePTOisengagedthereisa1seconddelayandthen
theenginestops.
TestingtheSafetyInterlockSystem
ServiceInterval:Beforeeachuseordaily
Testthesafetyinterlocksystembeforeyouusethemachine
eachtime.Ifthesafetysystemdoesnotoperateasdescribed
below,haveanAuthorizedServiceDealerrepairthesafety
systemimmediately.
1.Sittingontheseat,engagetheparkingbrakeandmove
thePTOtoon.Trystartingtheengine;theengine
shouldnotcrank.
2.Sittingontheseat,engagetheparkingbrakeandmove
thePTOtooff.Engagethetractionpedal.Trystarting
theengine;theengineshouldnotcrank.
3.Sittingontheseat,engagetheparkingbrake,move
thePTOswitchtooffandallowthetractionpedalto
returntotheneutralposition.Nowstarttheengine.
Whiletheengineisrunning,releasetheparkingbrake,
engagethePTOandriseslightlyfromtheseat.Ontwo
wheeldrivemachines,theengineshouldstopwithin2
seconds.Onfourwheeldrivemachines,themower
deckwillshutoff.Theenginewillcontinuetorun.
4.Withoutanoperatorontheseat,engagetheparking
brake,movethePTOswitchtooffandmovethe
tractionpedaltotheneutralposition.Nowstartthe
engine.Whiletheengineisrunning,engagethetraction
pedal;theengineshouldstopwithin2seconds.
5.Withoutanoperatorontheseat,disengagetheparking
brake,movethePTOswitchtooff,andallowthe
tractionpedaltoreturntotheneutralposition.Try
startingtheengine;theengineshouldnotcrank.
UsingtheSCMtoDiagnoseSystem
Problems
2wheeldrivemodelsonly
Themachineisequippedwithastandardcontrolmodule
(SCM)monitoringsystemthattracksthefunctionofvarious
keysystems.TheSCMislocatedundertheseat.
OnthefaceoftheSCMare11LEDsthatilluminateto
indicatevarioussystemconditions.Sevenoftheselightscan
beusedbytheoperatorforsystemdiagnosis.Referto
Figure
19foradescriptionofwhateachlightmeans.Fordetails
onusingtherestoftheSCMfunctions,refertotheService
Manual,availablethroughyourAuthorizedToroDistributor.
Figure19
1.Hightemperatureshutdown—theenginetemperaturehas
exceededsafelevelsandtheenginehasbeenshutdown.
Checkthecoolingsystem.
2.Hightemperaturewarning—theenginetemperatureis
approachingunsafelevelsandthePTOhasbeenshut
down.Checkthecoolingsystem.
3.Operatorisintheseat
4.ThePTOisOn
5.Theparkingbrakeisnotengaged
6.ControlsareinNeutral
7.TheSCMisreceivingpowerandisoperational
UnderstandingtheDiagnostic
Light
(4WheelDriveonly)
Themachineisequippedwithadiagnosticlightwhich
indicatesiftheelectroniccontrollersensesanelectronic
malfunction.Thediagnosticlightislocatedonthecontrol
panel(
Figure20).Whentheelectroniccontrolleris
functioningcorrectlyandthekeyswitchismovedtothe
Onposition,thecontrollerdiagnosticlightwillturnON
for3secondsandturnOFFtoindicatethelightisworking
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