Toro Groundsmaster 4300-D Service Manual

TheGroundsmaster4300-Dhydrauliccontrolmanifoldsuseseveralhydraulic
solenoidvalvecoilsforsystemcontrol.Thedeckcontrolmanifoldincludes2
solenoidvalves(Figure180)andtheliftcontrolmanifoldincludes3solenoid
valves(Figure181).Whenthesolenoidcoilsareenergized,thehydraulicvalve
shiftoccurstocontrolthehydraulicuidow.Thecorrectresistanceofacoilcan
beidentiedbymeasuringtheheightanddiameterofthecoil(Figure182).Refer
toSolenoidValveCoilSpecicationsT able(page5–74).Testingofthecoilscan
bedonewiththecoilinstalledonthehydraulicvalve.
Note:The2solenoidvalvecoilsonthedeckcontrolmanifold(PRV1andPRV2)
areidentical.ThesolenoidvalvecoilsSV1andPRVontheliftcontrolmanifold
areidenticalandarethesameasthoseusedonthedeckcontrolmanifold.The
remainingliftcontrolmanifoldcoil(SV2)isdifferent.Toassistintroubleshooting,
identicalcoilscanbeexchanged.Iftheproblemfollowstheexchangedcoil,an
electricalproblemlikelyexistswiththecoil.Iftheproblemremainsunchanged,
somethingotherthanthesolenoidcoilistheproblemsource(e.g.,switch,circuit
wiring,andhydraulicproblem).
TestingtheHydraulicSolenoidValveCoils
Note:Beforeyoudisconnectthesolenoidvalvecoils,testthesolenoidsand
theircircuitwiringasTECoutputswiththeInfoCenterdisplay;refertoUsingthe
InfoCenterDisplayforTroubleshooting(page5–26).IftheInfoCenterveries
thatthesolenoidcoilsandcircuitwiringarefunctioningcorrectly,thennomore
testingisnecessary.
1.Parkthemachineonalevelsurface,lowerthecuttingdecks,shutoffthe
engine,settheparkingbrake,andremovethekeyfromthekeyswitch.
2.Togetaccesstothedeckcontrolmanifold,raiseandproptheoperatorseat.
Togetaccesstotheliftcontrolmanifold,removetheoperatoroorplate.
3.Identifythecoilbymeasuringtheheightanddiameterofthecoil.
4.Disconnectthewireharnessconnectorfromthehydraulicsolenoidvalve
coilthatistobetested.
Note:Beforetakingthesmallresistancereadingswithadigitalmultimeter,
shortthemultimetertestleadstogether.Themultimeterdisplaysasmall
resistancevalue(usually0.5ohmsorless).Thisresistanceisbecauseofthe
internalresistanceofthemultimeterandtestleads.Subtractthisvaluefrom
themeasuredvalueofthecomponentthatyouaretesting.
Note:Thesolenoidcoilresistanceshouldbemeasuredwithsolenoidat
approximately20°C(68°F).Resistancemaybeslightlydifferentthanlisted
atdifferenttemperatures.Typically,adamagedsolenoidcoilwilleitherbe
shorted(verylowornoresistance)oropen(inniteresistance).
5.Useamultimeter(ohmssetting),measuretheresistancebetweenthe2
connectorterminalsonthesolenoidcoil.Theresistanceforthesolenoidcoils
isidentiedintheSolenoidValveCoilSpecicationsT able(page5–74).
SolenoidValveCoilSpecicationsTable
SolenoidValveCoil
DiameterHeightResistance
PRV1andPRV2
(deck)
46.7mm(1.84inches)49.9mm(1.96inches)
7.1ohms
SV1andPRV(lift)46.7mm(1.84inches)49.9mm(1.96inches)
7.1ohms
SV2(lift)35.8mm(1.41inches)36.3mm(1.43inches)
8.8ohms
6.Ifthesolenoidcoilresistanceisincorrect,replacethesolenoidcoil;referto
HydraulicSolenoidValveCoils(page5–91).
ElectricalSystem:TestingtheElectricalComponents
Page5–74
Groundsmaster
®
4300-D
16226SLRevC

Toro Groundsmaster 4300-D Specifications

General

Brand	Toro
Model	Groundsmaster 4300-D
Category	Lawn Mower
Language	English