Toro 74492 - Electric PTO Clutch

PTOSwitchTest(continued)
•Pin1and4shouldNOThavecontinuity(open)
•Pin2and5shouldNOThavecontinuity(open)
ElectricPTOClutch
ThePTOclutchelectronicallycontrolstheengagementanddisengagement
ofthePTOpulley(deckbelt).
ThePTOclutchiscomposedofthreemajorcomponents:
•Field
•ClutchPlate
•FrictionPlate
Theclutchplatealwaysturnswiththeengine(crankshaft).Theeldisacoilof
wireonanironcorewhichbecomesanelectromagnetwhenpowerisapplied.
Thefrictionplateistheonlypiecethatmovesverticallyonthecrankshaft.Itis
normallyspringloadedsothatitisnotincontactwiththeclutchplateandis
pressedagainstthebrakematerialoppositetheclutchplate.Whenpoweris
applied,thefrictionplateispulledtowardtheclutchplateandthetworotateas
one.Whentheclutchplateandthefrictionplaterotateasdifferentspeedsit
isknownasclutchslipping.
ElectricPTOClutchRemoval
1.ParkthemachineonalevelsurfaceanddisengagethePTO.Stopthe
engine,waitforallmovingpartstostop,andremovethekey.
2.Disconnectthebatterybyremovingthenegativecablerst,thenthepositive
cablefromthebattery.
3.Raiseandsupporttheunitsothatthedrivewheelsareofftheground.
4.Removethemowerbelt.MowerBeltReplacement(page6–6)
5.Disconnecttheclutchwireconnectorfromtheclutch.
g336161
Figure92
6.Removetheclutchmountingboltandwashers.Sliptheclutchoffofthe
crankshaft.
ElectricPTOClutchInstallation
1.Installtheclutchontothecrankshaftverifyingthattheslotintheclutchaligns
withthetabontheclutchanchor
2000SeriesZMASTER®ServiceManual
Page8–11
Electrical:ServiceandRepairs
3438-778RevA