Contactors
1
3
2
4.5 to 5.6 N·m
(40 to 50 in-lb)
FRONT
g288534
Figure229
1.12voltbattery
3.Cabcomponentcontactor
2.24Voltcoolingfancontactor
AcontactorisusedonallGroundsmaster5900and5910machinestoprovide
currenttothe24voltcoolingfans.Thecontactorisattachedtotherearpower
centerintherightrearcorneroftheenginecompartment(Figure229).The
contactorisenergizedbythemastercontrollerwhenthekeyswitchisinthe
STARTorRUNposition.
AnadditionalcontactorisusedonallGroundsmaster5910machinestoprovide
currenttothecabmountedelectricalcomponents.Thecontactorisattachedto
therearpowercenterintherightrearcorneroftheenginecompartment(Figure
229).ThecontactorisenergizedwhenthekeyswitchisintheSTARTorRUN
position.
Testing
1.MakesurekeyswitchisOFF .Removekeyfromkeyswitch.
2.Turnbattery−disconnectswitchtotheOFFposition.
3.Recordwireconnectorlocationsoncontactorbeingtestedforassembly
purposes.Disconnectallharnesselectricalconnectorsfromcontactor.
Note:Priortotakingsmallresistancereadingswithadigitalmultimeter,
shortthemetertestleadstogether.Themeterwilldisplayasmallresistance
value(usually0.5ohmsorless)thatisduetotheinternalresistanceofthe
meterandtestleads.Subtractthisvaluefromthemeasuredvalueofthe
componentyouaretesting.
Groundsmaster
®
5900&5910
Page6–89
ElectricalSystem:ComponentTesting
16227SLRevB
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