Service Manual

Table Of Contents
TractionPedalAssembly
g257736
Figure88
Thetractionpedalassemblyincludes2analoghalleffectsensorsthatdonot
requirecalibration.Thesensorsoperateon5VDCsuppliedbytheT1:TEC.
SignalvoltagefromthepedalsensorsareusedbytheT1:TEC(alongwith
informationfromadditionalinputs)todetermineappropriatecurrentowtothe
tandempiston(traction)pumpcontrolvalves.Thesensorsignalsarealso
constantlymonitoredfortractionfaultdetection.
Ifatractionpedalfaultoccurswhilethemachineismoving,themachinewill
slowlycometoastop.Thedeceleratorpedalcanbeusedtostopthemachine
soonerifnecessary.Atractionpedalfaultwilldisabletractioncontroluntilthe
ignitionkeyiscycledOFFandON.
TestingtheTractionPedalAssembly
ThetractionpedalassemblyanditscircuitwiringcanbetestedasaT1:TEC
inputusingtheInfoCenterDisplay;refertoUsingtheInfoCenterDisplayfor
Troubleshooting(page3–23).Iftestingdeterminesthattheassemblyand
itscircuitwiringarenotfunctioningcorrectly,proceedwiththefollowingtest
procedure:
1.Parkthemachineonalevelsurface,loweranyattachmentsandstopthe
engine.
2.Disconnecttheplatformwireharnessfromthetractionpedal.Checkthe
pedalandtheharnessconnectorfordamageorcorrosion.
3.ConnectpinsCandDtoa5VDCpowersupply,andconnectpinsBand
Etoground.
4.Usingamultimeter(DCvoltagesetting)withthetractionpedalatrest,less
than0.62VDCshouldbepresentatpinAandlessthan0.75VDCshouldbe
presentatpinF .
5.Usingamultimeter(DCvoltagesetting)withthetractionpedalfully
depressed,2.5VDCshouldbepresentatpinAand4.5VDCshouldbe
presentatpinF .
6.Replacethetractionpedalassemblyifnecessary.
7.Ifthetractionpedaltestscorrectlyandacircuitproblemstillexists,checkthe
wireharnesses;refertoAppendixA(pageA–1).
Outcross9060
Page6–45
ElectricalSystem:ElectricalComponentTesting
18234SLRevD