Service Manual
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Figure272
1.Tractioncontrolmanifold2.Solenoidcoil(portS)
Therearenumeroushydraulicvalvesolenoidcoilsonthehydraulicmanifoldsof
themachine.Whenthesolenoidcoilsareenergized,thehydraulic-valveshift
occurstocontrolthehydraulicow.Testingofthesesolenoidcoilscanbedone
withthesolenoidcoilonthehydraulicvalve.
TestingtheHydraulicValveSolenoidCoils
Note:TheInfoCenterdisplaydoesnotidentifyadamagedsolenoidcoilor
solenoidcircuitwiringproblem.TheInfoCenterdisplayveriesthattheoutput
currentfromtheTECisavailableforthesolenoidcoilbutthedisplaydoesnot
verifythatthesolenoidcoilandcircuitwiringisfunctioningcorrectly.
1.Identifythesolenoidcoilthatmustbetested.
2.Disconnectthewireharnesselectricalconnectorfromthehydraulicsolenoid
valvecoilthatmustbetested.
Note:Beforetakingthesmallresistancereadingswithadigitalmultimeter,
shortthemultimetertestleadstogether.Themultimeterdisplaysasmall
resistancevalue(usually0.5ohmsorless)thatisbecauseoftheinternal
resistanceofthemultimeterandtestleads.Subtractthisvaluefromthe
measuredvalueofthecomponentthatyouaretesting.
3.Useamultimeter(ohmssetting),measuretheresistancebetweenthe2
connectorterminalsonthesolenoidcoil.Theresistanceforthesolenoid
coilsisidentiedbelow:
A.Thesolenoidcoilsatthefollowingcontrolmanifoldportsarethesame:
•PTOmanifoldportS(Figure269,Figure270,andFigure271)
•TractionmanifoldportS(Figure272)
•4-wheeldrivemanifoldportSV(Figure273)
•LiftmanifoldportsS1,S4,S5,andS9(Figure274)
Note:Theresistanceofthesecoilsmustbeapproximately8.8ohms.
Groundsmaster5900TractionUnit
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ElectricalSystem:TestingtheComponent
08159SLRevC