Peterbilt 348 2017 - Page 189

AXLE
Starting-Up
1.Unlocktheinter-axledifferential
beforestarting.
2.PuttheRangeSelectorinthe
LOWrange.Shiftthetransmission
tostartthevehiclemoving.
3.Whenyouaredrivingonrough
terrainandsecondaryroads,or
underaveryheavyload,keepthe
axleintheLOWrange.Shiftthe
transmissiontomaintainproper
roadspeed.
WARNING!
Nevershifttheaxlewhenmoving
downhill.Enginedrivelinedisen-
gagementmayoccur,eliminating
engineretardationandallowingthe
wheelstospinfasterthanthecur-
rentspeedoftheengine.Thismay
requireseverebrakingtoslowthe
vehicledownandcanresultinanac-
cident.Failuretocomplymayresult
indeath,personalinjury,equipment
orpropertydamage.
Propershiftingoftheaxledependson
thesynchronizationofengine/driveline
andwheelspeed.Whenyoushift
theaxle,theconnectionbetweenthe
engineandwheelsismomentarily
disengagedwhilethegearingis
synchronized.Normallywhentheaxle
isshiftedthespeedoftheengine,axle,
andwheelsadjust,allowingforproper
gearengagement.
Whengoingdownhillthewheelswill
notslowdown,butwilltendtospeed
up,whichmakesgearsynchronization
almostimpossible.Asaresult,the
axleisneitherinHIGHnorLOWrange
andallengine/drivelineretardationis
lost.Withoutengineretardationitis
moredifculttoslowthevehicledown
andgreaterstressisputonthebrake
system.
CAUTION
Toavoiddamagingyourvehicleshift
theaxleatslowertravelspeedsuntil
youareusedtodrivingwithadual
rangeaxle.
(03/17)Y53-6060-1C14-49
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