Paccar PX-9 - Engine Braking System

OPERATINGINSTRUCTIONS
PACCARenginesaredesignedto
operateatfullthrottleundermomentary
conditionsdowntopeaktorqueengine
speed.Thisisconsistentwith
recommendedoperatingpractices.
CAUTION
Operatingtheenginebeyond
themaximumenginespeedcan
causesevereenginedamage.
Useproperoperatingtechniques
forthevehicletopreventengine
overspeed.Themaximumengine
speedspecicationislistedinthe
“GeneralEngineSpecications”
onpage5-13.Failuretocomply
mayresultinequipmentorprop-
ertydamage.
CAUTION
DONOTidletheengineforex-
cessivelylongperiods.Longpe-
riodsofidling,morethan10min-
utes,cancausepoorengineper-
formance
NOTE
Forapplicationswithhigh
idle-time,tohelpreducesootload-
ingintheaftertreatmentsystem,
avoidlongperiodsofidling.Ifidling
isrequired,increaseidle-speed
usingthecruisecontrolfunction.
EngineBrakingSystem
VariableGeometryTurbo(VGT)
BrakeSystemGeneralInformation
1.SlidingNozzle
Thisenginemaybeequippedwitha
variablegeometryturbocharger(VGT)
withanexhaustbrakefeature.This
featureallowsthevariablegeometry
turbochargertoactasanexhaust
brakebyretardingthespeedofthe
enginetoprovideadditionalvehicle
brakingpowerandextendthelifeofthe
vehicleservicebrakes.TheON/OFF
(12/2014)Y53-1185-1B13-
7
3