Toro 75746 - TVS Diode; Magneto Stop Relay

MeasuringClutchCurrentDraw
Note:Donotmeasurecurrentdrawiftheclutchhasshortedtogroundorifthe
resistancemeasurementisoutofspecication.
1.ParkthemachineonalevelsurfaceanddisengagethePTO.Stopthe
engine,waitforallmovingpartstostop,andremovethekey.Engagethe
parkingbrake.
2.Disconnecttheclutchwireconnector.
3.Setthemulti-metertomeasureamps(10ampscale).
4.ConnectthepositivemeterleadtothechassisharnessterminalA.
5.Connectthenegativemeterleadtothecorrespondingclutchterminal.
6.ConnectashortjumperleadfromterminalC(largeredwirewithcap)to
terminalD(largeredwirewithnocap).
7.TurntheignitionswitchtoRUNandthePTOswitchtotheONposition.
8.RecordtheampreadingandrefertothePTOClutchElectricalSpecication
Chart.
Resistance(OHMs)
AMPDraw
ContinuitytoGround
3.05±5%
3.93
OPEN
TVSDiode
TheTVSDiodeprotectstheelectricalsystemfromcurrentsurgescausedby
PTOengagementanddisengagement.
g322161
Figure95
TVSDiodeTesting
Notestingprocedureavailable.Ifthediodeissuspectedtobefaulty,replacethe
diode.Ifthesystemfuseblowseachtimetheclutchisengaged,theTVSdiode
ismorethanlikelyshortingclutchpowertoground.
MagnetoStopRelay
Themagnentostoprelaygroundsthemagnetowhenthekeyisturnedtothe
“OFF”position.Whenthekeyisturnedtothe“RUN”position,thesolenoidis
TitanServiceManual
Page8–11
Electrical:ServiceandRepairs
3438-774RevA