Navistar International LT Series - Engaging the Clutch

Operation
10-SpeedManualTransmission(standard):Thegearshift
levermechanicallyengagesanddisengagesveforwardgears
andonereversegearinthetransmissionfrontsection.The
rangeleverontheRoadrangerValveallowstheoperatorto
controlanairshiftedauxiliarysectiontoprovideaLOrangeand
HIrange.
TheveforwardgearshiftpositionsselectedinLOrangeare
usedagaininHIrangetoprovidethe10progressiveforward
gearratios.Oncethehighestshiftleverposition(5thgear)is
obtainedinLOrange,theoperatorpreselectstherangeshift
leverforHIrange.Therangeshiftoccursautomaticallyas
theshiftleverismovedfrom5thgearpositiontothe6thgear
position.
1.Whenoperatingoff-highway,orunderadverse
conditions,alwaysusethelowestgearwhenstartingto
movethevehicle.
2.Forallnormalconditions,usethehighestgearthatis
stilllowenoughtostartthevehiclemovingwithengine
idling,andwithoutslippingtheclutchexcessively.
3.Usetheclutchbraketostopgearrotationwhenshifting
intolow(or1st)orreversewhenthevehicleisstationary.
Theclutchbrakeisactuatedbydepressingtheclutch
pedalallthewaytotheoor.
4.Donotmakerangeshiftswiththevehiclemovingin
reversegear.
5.Neverattempttomovetherangepreselectionleverwith
thegearshiftleverinNeutralwhilethevehicleismoving.
Preselectionwiththerangepreselectionlevermustbe
madepriortomovingtheshiftleveroutofgearinto
Neutral.
6.Donotshiftfromhighrangetolowrangeathighvehicle
speeds.
7.Doubleclutchbetweenallupshiftsanddownshifts.
8.Afteryourshiftingabilityimproves,youmaywantto
skipsomeoftheratios.Thismaybedoneonlywhen
operatingconditionspermit,dependingontheload,
grade,androadspeed.Transmissionswithagreater
numberofspeedsareoptionallyavailable.Theymay
includetheuseofasplitterselectorswitchinaddition
totherangeselectorswitch.
EngagingtheClutch
•Alwaysstartinthepropergear.Anemptyvehicle
canbestartedinahighergearthanafullyloadedone.
Butstartinginageartoohighfortheloadcancause
toomuchclutchslippage,generatingexcessiveheat
andunnecessarywear.Agearthatwillstartthevehicle
movingwiththeengineatidlespeedisusuallycorrect.
Iftheenginemustberevveduptopreventstalling,the
gearselectionistoohigh.Astheclutchpedalisreleased
andtheclutchbeginstoengage,theenginespeedwill
dropslightly.Whenthishappens,fullyengagetheclutch
andincreasetheenginespeed.Increasingtheengine
speedbeforefullyengagingtheclutchcandamagethe
clutchanddrivetrain.
•Donotupshiftuntiltheenginehasreachedproper
speed.Upshiftingbeforethevehiclehasreachedthe
rightspeedwilllugtheengine.
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