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Navistar International LT Series User Manual

Navistar International LT Series
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Operation
Whenapproachingahill,depressacceleratorsmoothly
tostarttheupgradeatfullpower,thendownshiftas
neededtomaintainvehiclespeed.
Neverholdavehicleonahillwiththeclutch.To
holdonahillwiththeclutchrequiresthattheclutchbe
purposelyslipped.Bydoingthisenoughheatcanbe
generatedtoburnuptheclutch.
Nevercoastwiththeclutchdisengaged.Thiscan
causeclutchfailurebytheveryhighrpmencountered
whencoastingingearwiththeclutchreleased.Inthis
situation,therearwheelsaredrivingthediscthrough
themultiplicationoftherearaxleandtransmissionratios.
Thiscanresultinover10,000rpm,whichisbeyondthe
burststrengthofthefacingmaterial.Somethingassimple
ascoastingdownanunloadingrampcanburstadriven
disc.
Reengagingaclutchaftercoastingcausestremendous
shocktotheclutchandthewholedrivetrain.Itcanresultin
internalenginedamageand/orclutchandywheelfailure.
Alwaysreportunusualclutchoperationpromptly.Proper
maintenance,performedontime,willgreatlyextendthelife
oftheclutch.Thedrivershouldreportanychangeinfree
pedal(freetravel)slippageoranystrangefeeltotheclutch
operation.
HelpfulHintstoOperateVehicleswithCeramicClutch
Facings
1.Drivermuststartvehicleinrst(low)gear.
2.Whileoperatingaceramicclutchthedriverhasto
engagetheclutchbeforegivingtheengineanyfuel(at
idle).
3.Thedrivershouldnottrytosliptheceramicclutchby
raisingenginerpmandridingorfeatheringclutchpedal
sincethevehiclewillexperienceerraticengagement.
Erraticengagementcancauseenginestallingandpotential
seriousdamagetoyourvehicle’sdrivetraincomponents(such
asclutch,transmission,driveshaft(s),andrearaxle).
HydraulicClutchActuationSystem
Clutchbrakeengagementoccursinthelast2inches(50mm)
ofpedaltravelafterinitialclutchsetupadjustment.Clutchwear
willmovethepedalpositionatclutchbrakeengagementtoward
thephysicallimitoftravel.Thehydraulicclutchsystemmust
haveproperuidbleedingbeforeoperating,usuallyperformed
atthefactory,orateldservicing.Hydraulicclutchuidshould
bedrainedandrelledevery2yearsofserviceorafter200,000
miles(322,000km)serviceinterval.
169

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Navistar International LT Series Specifications

General IconGeneral
BrandNavistar
ModelInternational LT Series
CategoryTrucks
LanguageEnglish

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