Toro 08743 - Hydraulic Solenoid Valve Coils (Optional)

HydraulicSolenoidValveCoils(Optional)
g354354
Figure87
1.Rearremotehydraulicskitmanifold4.hydraulicsswitchkitmanifold7.ValveSV3coil(rearattachment)
2.Valvecoil(rearattachment)5.ValveSV1coil(tank)
3.Coilnut6.ValveSV2coil(frontattachment)
Electriccoilactuatedhydraulicvalvesareusedontheoptionalrearremote
hydraulicskitmanifoldandtheoptionalhydraulicsswitchkitmanifold.Whenthe
coilisenergized,thehydraulicvalveshiftstocontrolhydraulicow.
Toassistintroubleshooting,identicalreplaceablesolenoidcoilscanbe
exchanged.Iftheproblemfollowsthecoil,thecoilislikelyatfault.Iftheproblem
remainsunchanged,somethingotherthanthecoilisthelikelyproblemsource
(e.g.switch,circuitwiring,hydraulicproblem).
TestingtheHydraulicSolenoidValveCoils
Typically,afailedsolenoidcoilwilleitherbeshorted(verylowornoresistance)
oropen(inniteresistance).
1.Locatethehydraulicsolenoidvalvecoiltobetestedanddisconnectthewire
harnessconnectorfromthecoil.Checktheharnessconnectorsfordamage
orcorrosionandcleanorrepairifnecessary.
Note:Priortotakingsmallresistancereadingswithadigitalmultimeter,short
themetertestleadstogether.Themeterwilldisplayasmallresistancevalue
(usually0.5ohmsorless).Thisresistanceisduetotheinternalresistanceof
themeterandtestleads.Subtractthisvaluefromthemeasuredvalueofthe
componentyouaretestingtoobtainanaccuratereading.
2.Usingamultimeter(ohmssetting),measuretheresistancebetweenthetwo
(2)connectorterminalsonthesolenoidcoil.Theresistanceforthesolenoid
coilsisidentiedbelow:
A.Thecoiloftherearattachmentsolenoidvalveontheoptionalrearremote
hydraulicsmanifoldshouldmeasureapproximately7.1ohmswhen
testedat20°C(68°F).
B.ThecoilsofsolenoidvalvesSV1,SV2,andSV3ontheoptional
hydraulicsswitchkitmanifoldarethesame.Resistanceofthesecoils
shouldbeapproximately8.8ohmswhentestedat20°C(68°F).
3.Replacesolenoidvalvecoilsifnecessary:
A.Removethenutfromthehydraulicvalve.
B.Slidethesolenoidcoilfromthevalve.
C.Cleananycorrosionordirtfromthevalvestem.
SandPro
®
3040and5040
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ElectricalSystem:TestingtheElectricalComponents
20251SLRevA