Peterbilt 348 2017 - Page 367

TRANSMISSIONANDCLUTCH
calledreleasetravel.Andnally,on
9-,10-,and11-speedtransmissions,
asthepedalispushedtothelast1/2
to1inchoftravel,thereleasebearing
contactsandengagestheclutchbrake.
Thisiscalledclutchbrakesqueeze.
Whentheclutchwears,therelease
bearinggraduallymovestowardthe
engine,decreasingfreepedalandfree
travel.Whenallfreepedalandfree
travelaregone,theclutchrequires
adjustment.
Theclutchisadjustedbyturningan
adjustmentringthatisbuiltintothe
clutch.Whentheringisturned,the
releasebearingmovesbacktoward
thetransmission,restoringfreepedal
andclutchfreetravel.Undernormal
clutchwearthisistheonlyadjustment
needed.Donotattempttochangeany
othercomponent.SeetheMedium
DutyMaintenanceManualfordetails.
ClutchAdjustment—
NormalWear
Clutchpedalfreetravelisusually13/4
in.to2in.(34to51mm).Thisshould
beyourguidefordeterminingwhether
yourtruckneedsclutchadjustment.
Also,ifitbecomesincreasinglydifcult
toshiftintogears,orthetruckcreeps
withtheclutchpedaldepressed,your
clutchneedsadjustment.Seethe
MediumDutyMaintenanceManualfor
theproperadjustmentprocedures.
Somevehicleshaveautomaticclutch
adjustment.Ifyoursdoesn'thavethis
feature,adjustmentwillhavetobe
donebyatrainedcertiedmechanic.
Havetheadjustmentdonebefore
clutchpedalfreetravelisreducedto
theminimumallowable1/2in.(13mm).
ClutchLinkage
TheMediumDutyisequippedwith
arodandlevermechanicalclutch
linkage.Lubricateeachpivotpointon
theclutchlinkage.
(03/17)Y53-6060-1C15-157
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