Paccar PX-9 - Page 51

OPERATINGINSTRUCTIONS
WARNING!
DONOTusetheenginebrake
whenoperatingonsurfacewith
poortraction(suchaswet,icy,or
snowcoveredroads).Retarders
cancausethewheelstoskidon
aslipperysurface.Youcouldlose
controlofthevehicleandjacknifeif
thewheelsbegintoskid,resulting
inanaccident.Failuretocom-
plymayresultindeath,personal
injury,equipmentorpropertydam-
age.
WARNING!
DONOTuseanenginebrake
whendrivingbobtailorwithanun-
loadedtrailer.Theremaynotbe
enoughweightontherearaxleto
providetraction.Thiscouldcause
alossofcontrolandjackknifere-
sultinginaninjuryaccident.Make
suretheenginebrakeisswitched
“OFF”whenbobtailingorwithan
unloadedtrailer.Failuretocom-
plymayresultindeath,personal
injury,equipmentorpropertydam-
age.
CAUTION
Neverexceedgovernedengine
speedbecauseenginedamage
canoccur.Operatingenginebe-
yondthegovernedspeedcauses
additionalstrainonvalvetrainand
internalenginecomponents.Op-
eratetheenginewithingoverned
enginespeed.
NOTE
Onceyouhavedeterminedwhat
thesafespeedisforyourvehicle,
operatetheenginebrakeswiththe
transmissioninthelowestgearthat
willnotcausetheenginespeed
toexceedtheratedenginespeed.
Theoptimumbrakingpowerofthe
enginebrakesisreachedatrated
enginespeed.Correctgearselec-
tion,therefore,iscritical.
Thetwo-positionselectorswitchcan
beusedtovarybrakingpowerasroad
conditionschange.
Vehicleservicebrakesmustbeused
whenadditionalbrakingpoweris
required.
(12/2014)Y53-1185-1B14-
15
4