Toro 74939 - Using the Clutch Shim

UsingtheClutchShim
Somelatermodelyearunitshavebeenbuiltwithclutchesthat
containabrakeshim.Whentheclutchbrakehasworntothe
pointwheretheclutchnolongerengagesconsistently,the
shimcanberemovedtoextendtheclutchlife.
Figure67
1.Armature5.Brakespacer
2.Fieldshell6.Re-gaptheshim
3.Rotor7.Brakepole
4.Brakemountingbolt
RemovingtheClutchShim
1.Stoptheengine,waitforallmovingpartstostop,and
removethekey.Engagetheparkingbrake.
Note:Allowthemachinetocoolcompletelybefore
startingtheseinstructions.
2.Usinganaircompressor,blowoutanydebrisfrom
underthebrakepoleandaroundthebrakespacers.
Figure68
3.Checktheconditionofthewireharnessleads,
connectors,andterminals.
Note:Cleanorrepairasnecessary.
4.Verifythat12Vispresentattheclutchconnectorwhen
thePTOswitchisengaged.
5.Measurethegapbetweentherotorandarmature.If
thegapisgreaterthan.04inch(1mm),proceedwith
thefollowingsteps:
A.Loosenbothbrakemountingboltsone-halfto
onefullturnasshownbelow.
Note:Donotremovethebrakepolefromthe
eldshell/armature.Thebrakepolehasworn
tomatchthearmatureandneedstocontinueto
matchaftertheshimisremovedtoensureproper
braketorque.
Figure69
1.Brakemountingbolt
B.Usingneedlenosepliers,orbyhand,takehold
ofthetabandremovetheshim(DoNotdiscard
theshimuntilproperclutchfunctionhasbeen
conrmed).
Figure70
1.Shim
C.Usingapneumaticline,blowoutanydebris
fromunderthebrakepoleandaroundthebrake
spacers.
D.Torqueeachbolt(M6x1)to10ft-lb(13N-m)
+/-0.5ft-lb(0.7N-m).
E.Usinga0.010inchthickfeelergauge,verifythat
agapispresentbetweentherotorandarmature
faceonbothsidesofthebrakepoleasshown.
Note:Duetothewaytherotorandarmature
faceswear(peaksandvalleys),itmaybedifcult
tomeasurethetruegap.
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