PACCAR MX Operator's Manual

Contents

Safety

Emergency

Controls

Driving

Maintenance

Information

Index

1

2

3

4

5

6

7

Contents

©2011PaccarInc-AllRightsReserved

Thismanualillustratesanddescribestheoperationoffeaturesorequipmentwhichmaybeeitherstandardoroptionalon
thisvehicle.Thismanualmayalsoincludeadescriptionoffeaturesandequipmentwhicharenolongeravailableorwere
notorderedonthisvehicle.Pleasedisregardanyillustrationsordescriptionsrelatingtofeaturesorequipmentwhichare
notonthisvehicle.

PACCARreservestherighttodiscontinue,changespecications,orchangethedesignofitsvehiclesatanytimewithout
noticeandwithoutincurringanyobligation.

TheinformationcontainedinthismanualisproprietarytoPACCAR.Reproduction,inwholeorinpart,byanymeansisstrictly
prohibitedwithoutpriorwrittenauthorizationfromP ACCARInc.

Safety

Introduction

SafetyAlerts..............1-3

Foreword...............1-5

ImportantReferenceNumber.......1-6

Illustrations...............1-7

GeneralSafetyInstructions........1-7

1

1-1

Introduction

Introduction

SafetyAlerts

Pleasereadandfollowallofthe
safetyalertscontainedinthismanual.
Theyarethereforyourprotection
andinformation.Thesealertscan
helpyouavoidinjurytoyourself,your
passengers,andhelppreventcostly
damagetothevehicle.Safetyalerts
arehighlightedbysafetyalertsymbols
andsignalwordssuchas"WARNING",
"CAUTION",or"NOTE".Pleasedonot
ignoreanyofthesealerts.

WARNING

WARNING:

Thesafetyalertfollowingthissymbol
andsignalwordprovidesawarning
againstoperatingprocedureswhich
couldcausedeathorinjury .Theycould
alsocauseequipmentorproperty
damage.Thealertwillidentifythe
hazard,howtoavoidit,andthe
probableconsequenceofnotavoiding
thehazard.

Example:

WARNING:Donotcarry
additionalfuelcontainersin
yourvehicle.Fuelcontainers,
eitherfullorempty,mayleak,
explode,andcauseorfeeda
re.Donotcarryextrafuel
containers.Evenemptyones
aredangerous.Failureto
complymayresultindeath,

personalinjury,equipmentor
propertydamage.

1

1-

3

Introduction

CAUTION

1

CAUTION:

Thesafetyalertfollowingthissymbol
andsignalwordprovidesacaution
againstoperatingprocedureswhich
couldcauseequipmentorproperty
damage.Thealertwillidentifythe
hazard,howtoavoidit,andthe
probableconsequenceofnotavoiding
thehazard.

Example:

CAUTION:Continuingto
operateyourvehiclewith
insufcientoilpressure
willcauseseriousengine
damage.Failuretocomply
mayresultinequipmentor
propertydamage.

NOTE

NOTE:

Thealertfollowingthissymboland
signalwordprovidesimportant
informationthatisnotsafetyrelated
butshouldbefollowed.Thealert
willhighlightthingsthatmaynotbe
obviousandisusefultoyourefcient
operationofthevehicle.

Example:

NOTE:Pumpingtheaccelerator
willnotassistinstartingthe
engine.

1-4

Introduction

Foreword

Thismanualcontainsinformationfor
thecorrectoperationandmaintenance
ofyourPACCARengine.Readand
followallsafetyinstructions.Refer
totheWARNINGinthe“General
SafetyInstructions”beginningon

page1-7.Keepthismanualwith

theequipment.Iftheequipmentis
tradedorsold,givethemanualto
thenewowner.Theinformation,
specications,andrecommended
maintenanceguidelinesinthismanual
arebasedoninformationineffect
atthetimeofprinting.PACCAR
reservestherighttomakechanges
atanytimewithoutobligation.Ifyou
nddifferencesbetweenyourengine
andtheinformationinthismanual,
contactyourlocalPACCARAuthorized
RepairLocationorwritetoPACCAR
c/oP ACCAREngines,POBox1518,
Bellevue,WA98009.Thelatest
technologyandthehighestquality
componentswereusedtoproducethis

engine.Whenreplacementpartsare
needed,werecommendusingonly
genuinepartsfromPACCAR.

1

1-5

Introduction

ImportantReference

1

Number

Fillinthepartnameandnumberintheblankspacesprovidedbelow .Thiswillgiveyouareferencewheneverserviceormaintenanceisrequired.

PartNameNumber

EngineModel

EngineSerialNumber(ESN)

OilType(UseAPICJ-4oilonly)

FilterPartNumbers:

AirCleanerElement

LubricatingOil

Fuel(Useultra-lowsulfurdieselfuelonly)

Coolant

BeltPartNumbers:

1-6

Introduction

Illustrations

GeneralInformation

Someoftheillustrationsthroughout
thismanualaregenericandwillnot
lookexactlyliketheengineorparts
usedinyourapplication.

Theillustrationsareintendedtoshow
repairorreplacementprocedures.
Theprocedurewillbethesameforall
applications,althoughtheillustration
candiffer.

GeneralSafetyInstructions

ImportantSafetyNotice

WARNING:Improper
practices,carelessness,
orignoringanywarnings
maycausedeath,personal
injury,equipmentorproperty
damage.

Beforeperforminganyrepair,readand
understandallofthesafetyprecautions
andwarnings.Thefollowingisalistof
generalsafetyprecautionsthatmust
befollowedtoprovidepersonalsafety .
Failuretofollowtheseinstructions
maycausedeathorinjury.Special
safetyprecautionsareincludedinthe
procedureswhentheyapply.

•Usethepropertoolformanually

rotatingtheengine.Donotattempt
torotatethecrankshaftbypulling
orpryingonthefan.Thispractice
cancausedeath,personalinjury,
equipmentdamage,ordamageto

thefanblades,causingpremature
fanfailure.

•Workareasshouldbedry,welllit,

ventilated,freefromclutter,loose
tools,parts,ignitionsourcesand
hazardoussubstances.

•Wearprotectiveglassesand

protectiveshoeswhenworking.

•Donotwearloose-ttingortorn

clothing.Removealljewelrywhen
working.

•Beforebeginninganyrepair,

disconnectthebattery(negative
[-]cable)anddischargeany
capacitors.

•Puta"DONOTOPERATE"tagin

theoperator’scompartmentoron
thecontrols.

•Allowtheenginetocoolbefore

slowlylooseningthecoolantller
captorelievethepressurefrom
thecoolingsystem.

1

1-

7

Introduction

•Alwaysuseblocksorproper

1

standstosupportthevehicle
orvehiclecomponentsbefore
performinganyservicework.
Donotworkonanythingthatis
supportedonlybyliftingjacksor
ahoist.

•Beforeremovingordisconnecting

anylines,ttings,orrelateditems,
relieveallpressureintheair,oil,
fuel,andcoolingsystems.Remain
alertforpossiblepressurewhen
disconnectinganydevicefroma
systemthatcontainspressure.
Highpressureoilorfuelcancause
deathorpersonalinjury .

•Alwayswearprotectiveclothing

whenworkingonanyrefrigerant
(Freon)linesandmakesurethat
theworkplaceisinawellventilated
area.Inhalationoffumescan
causedeathorpersonalinjury.
Toprotecttheenvironment,
liquidrefrigerantsystemsmust
beproperlyemptiedandlled

usingequipmentthatprevents
thereleaseofrefrigerantgas.
Federallawrequirescapturing
andrecyclingrefrigerant.

•Whenmovingorliftinganyheavy

equipmentorparts,makesure
tousepropertechniquesand
assistance.Ensurealllifting
devicessuchaschains,hooks,or
slingsareingoodconditionand
areofthecorrectloadcapacity.
Makesureanyliftingdevicesare
positionedcorrectly .

•Corrosioninhibitorsandlubricating

oilsmaycontainalkali.Donotget
thesubstanceineyesandavoid
prolongedorrepeatedcontact
withskin.Donotswallow.In
caseofcontact,immediatelywash
skinwithsoapandwater.Incase
ofharmfulcontact,immediately
contactaphysician.Alwayskeep
anychemicalsOUTOFREACH
OFCHILDREN.

•NapthaandMethylEthylKetone

(MEK)areammablematerials
andmustbeusedwithcaution.
Followthemanufacturer’s
instructionstoensuresafetywhen
usingthesematerials.Always
keepanychemicalsOUTOF
REACHOFCHILDREN.

•Whenworkingonthevehicle,

bealertforhotpartsonsystems
thathavejustbeenturnedoff,
exhaustgasow,andhotuidsin
lines,tubes,andcompartments.
Contactwithanyhotsurfacemay
causeburns.

•Alwaysusetoolsthatareingood

condition.Makesureyouhave
theproperunderstandingofhow
tousethetoolsbeforeperforming
anyservicework.Useonly
genuinereplacementpartsfrom
PACCAR.

1-

8

Introduction

•Alwaysusethesamefastener

partnumber(orequivalent)when
replacingitems.Donotuse
afasteneroflesserqualityif
replacementsarenecessary.

•Donotperformanyrepairwhen

impaired,tired,fatiguedorafter
consumingalcoholordrugsthat
canimpairyourfunctioning.

•Somestateandfederalagencies

intheUnitedStatesofAmerica
havedeterminedthatusedengine
oilcanbecarcinogenicandcan
causereproductivetoxicity.Avoid
inhalationofvapors,ingestion,
andprolongedcontactwithused
engineoil.

•Coolantistoxic.Ifnotreused,

disposeofcoolantinaccordance
withlocalenvironmental
regulations.

•CaliforniaProposition65Warning

-Dieselengineexhaustandsome
ofitsconstituentsareknownto
theStateofCaliforniatocause
cancer,birthdefects,andother
reproductiveharm.

•Thecatalystsubstratelocated

intheDieselParticulateFilter
containsVanadiumPentoxide.
VanadiumPentoxidehasbeen
determinedbytheStateof
Californiatocausecancer.Always
wearprotectiveclothingandeye
protectionwhenhandlingthe
catalystassembly.Disposeofthe
catalystinaccordancewithlocal
regulations.Ifcatalystmaterial
getsintotheeyes,immediately
oodeyeswithwaterfora
minimumof15minutes.Avoid
prolongedcontactwithskin.In
caseofcontact,immediatelywash
skinwithsoapandwater.Incase
ofharmfulcontact,immediately
contactaphysician.

CAUTION:Corrosive
chemicalscandamage
theengine.Donotuse
corrosivechemicalsonthe
engine.Failuretocomply
mayresultinequipmentor
propertydamage.

1

1-9

WHATTODOIF...

YouNeedRoadsideAssistance......2-3

StopEngineLampTurnsOn.......2-3

EngineOilPressureLampTurnsOn....2-4

CheckEngineLampTurnsOn......2-5

EngineisOverheating..........2-5

EMERGENCY

2

2-1

WHATTODOIF...

WHATTODOIF ...

YouNeedRoadside Assistance

Calltoll-FREEtotalktosomeoneat
theP ACCARCustomerCenter.The
toll-FREEtelephonenumberislocated
onthewindshielddecal.

•Open24-7-365daysayear

•Theycanhelpyougetroadside

assistance.

•Theyhaveacustommapping

systemwhichlocatesauthorized
PACCARenginedealersand
IndependentServiceProviders
(ISPs)nearyouandliststypes
ofservicesoffered,hoursof
operationandcontactinformation.

•Theycanassistwithjumpand

pullstarts,tires,trailers,nesand
permits,chains,towing,hazardous
clean-up,outoffuel(roadside),

mechanicalrepairsandpreventive
maintenanceservices.

•Theyhavemultilingualagentsand

accesstoatranslationservice
toensurequalityassistance
forcustomerswhospeakany
language.

•Theycan’tansweryourwarranty

questionsbutcangetyouin
contactwithanauthorizeddealer
whocan.

•ThePACCARCustomerCenter

serviceisFREE.

StopEngineLampTurnsOn

StopEngineLamp-Ifthe

StopEnginewarninglamp
illuminates,itmeansyou
haveaseriousenginesystem
problem.

WARNING:Thisshouldbe
consideredanemergency.
Youshouldstopthevehicle
assafelyaspossibleand
turnOFFtheignition.The
vehiclemustbeservicedand
theproblemcorrectedbefore
drivingagain.Failuretodo
somayresultinpersonal
injury,severeenginedamage,
equipmentorproperty
damage.

2

2-

3

WHATTODOIF...

EngineOilPressureLamp TurnsOn

2

CAUTION:Continuingto
operateyourvehiclewith
insufcientoilpressuremay
causesevereenginedamage,
equipmentorproperty
damage.

•Iftheoilpressurefailsto

•SeeLubricatingOil

EngineOilPressureGauge

-Itisimportanttomaintain
oilpressurewithinacceptable
limits.Ifoilpressuredrops
belowtheminimumpsia
RedWarningLampontheoil
pressuregaugeandtheStop
EngineLampwillcomeON.

risewithin10seconds
aftertheenginestarts,
stoptheengineand
determinethecause.

Systemonpage5-1 1,for

thecorrectoilpressure
rangesforyourvehicle’s
engine.

•Iftheoilpressure
suddenlydrops,orthe
audiblealarmandengine
oilpressurewarninglight
comeonwhiledriving,do
thefollowing:

1.Slowdowncarefully.

2.Moveasafedistanceoff
theroadandstop.

3.Placethetransmission
inneutralandsetthe
parkingbrake.(See
ParkingBrakeValve
andOPERATINGTHE
TRANSMISSIONin
yourvehicleOperator’s
Manual,fortransmission
shiftingandparkingbrake
information.)

4.TurnOFFtheengine.

5.TurnONtheemergency
asheranduseother
warningdevicestoalert
othermotorists.

6.Waitafewminutesto
allowoiltodrainintothe
engineoilpan,andthen
checktheoillevel.(See
InspectionoftheEngine
OilLevelonpage5-4.)

7.Addoilifnecessary.Ifthe
problempersists,contact
anauthorizedP ACCAR
enginedealerassoonas
possible.

2-

4

WHATTODOIF...

CheckEngineLampTurns On

CheckEngineLamp-Turns

onwhenaproblemexists,but
thevehiclecanstillbesafely
driven.Vehicleshouldbe
servicedtocorrecttheproblem
butthesituationshouldnotbe
consideredanemergency.

EngineisOverheating

CAUTION:Thecooling
systemmayoverheatifthe
enginecoolantisatthe
minimumlevel.Asudden
lossofcoolant,causedby
asplithoseorbrokenhose
clampcouldalsoleadtoan
overheatcondition.Always
inspecttoensurehosesand
clampsarenotcracked,worn,
orloose.Failuretocomply
mayresultinequipmentor
propertydamage.

NOTE:Thesystemmayalso
temporarilyoverheatduring
severeoperatingconditions
suchas:

•Climbingahillonahotday.

•Stoppingafter
high-speed/high-load
driving.

•Debrisblockingairow
throughthecoolingmodule
(radiator).

NOTE:Iftheenginecoolant
temperaturewarninglamp
comesonandtheaudiblealarm
soundsshowinganoverheat
condition,orifyouhaveany
otherreasontosuspectthe
enginemaybeoverheating,
DONOTTURNOFFTHE
ENGINEunlessalowwater
warningdeviceindicatesaloss
ofcoolant.Followthesesteps:

•Reduceenginespeedor
stop.Whenstopped,place
thetransmissioninneutral
andsettheparkingbrake.
Seethevehicleoperator’s
manualforinstructionson
transmissionshiftingand
parkingbrakeinformation.

2

2-

5

WHATTODOIF...

•Checktoensurethatthe
oilpressuregaugereads
normal.

•Increasetheenginespeed

2

to1,100to1,200rpm
maximumfor2-3minutes.

•Monitortheengine
temperature.Afterthe
temperaturereturnsto
normal,allowtheengine
toidle3–5minutesbefore
shuttingitoff.Thisallows
theenginetocoolgradually
anduniformly .

•Iftheoverheatingcame
fromsevereoperating
conditions,thetemperature
shouldhavecooledbythis
time.

•Checkthecoolantlevelat
thecoolingmodulesurge
tank.

WARNING:Toreduce
thechanceofpersonal
injuryand/orvehicle
damagecausedbyengine
overheating,neverleave
theengineidlingwhenthe
vehicleisunattended.Ifthe
engineoverheats,immediate
actionisrequiredtocorrect
thecondition.Continued
unattendedoperationofthe
engine,evenforashorttime,
mayresultinseriousengine
damageorare.Failureto
complymayresultindeath,
personalinjury,equipmentor
propertydamage.

WARNING:Removingthe
surgetankllcapwhile
theengineishotcanbe
dangerous.Neverremove
thesurgetankcapwhilethe
engineisstillhot;youcould
bebadlyburned.Failureto
complymayresultindeath,

personalinjury,equipmentor
propertydamage.

•Scaldingsteamanduid
underpressuremay
escapeandcauseserious
personalinjuries.

•Waituntilthecoolant
temperatureisbelow
122°F(50°C).

•Protectyourface,hands,
andarmsbycoveringthe
capwithalarge,thick
ragtoprotectagainst
escapinguidandsteam.

•Carefullyandslowly
turnthecaponeturnto
allowexcesspressureto
escape,thenpushdown
andturnfornalremoval.
Seethevehicleoperator’s
manualforinstructions
oncheckingandlling
thecoolingmodulesurge
tank.

2-

6

WHATTODOIF...

CAUTION:Donotallow
yourenginetoidle,atlow
RPMs(400–600rpm),longer
than5minutes.Prolonged
periodsofidlingafterthe
enginehasreachedoperating
temperaturescandecrease
enginetemperatureandcould
causeenginedamagefrom
inadequatelubrication.The
normaltorsionalvibrations
generatedcanalsocause
transmissionwear.Anidle
shutdownfeature,available
onPACCARengines,can
beprogrammedtoshut
theenginedownaftera
periodoflowidleoperation
withnodriveractivity.A
ashingwarninglampwill
informthedriverofan
impendingshutdown.If
thetruckisequippedwith
PTOequipment,theengine
shutdownsystemcanbe
deactivatedwhenthePTOis

operational;however ,engine
idleperiodsshouldnot
exceed5minuteswhenever
possible.Failuretocomply
mayresultinequipmentor
propertydamage.

2

2-7

Controls

OperatingInstructions

EngineWarningLamps.........3-3

EngineOperatingRange.........3-6

EngineBrakingSystem.........3-6

3

3-1

OperatingInstructions

OperatingInstructions

EngineWarningLamps

GeneralInformation

Thefollowingenginewarninglamps
coveronlythelampscontrolledbythe
engine’sElectronicControlModule
(ECM).Pleaserefertothevehicle
operator’smanualforadditional
warninglampinformation.

CheckEngineLamp

Thecheckenginewarninglampwill
illuminatewhenaproblemexists,
butthevehiclecanstillbesafely
driven.Thevehicleshouldbeserviced
tocorrecttheproblem,butthe
situationshouldnotbeconsideredan
emergency.

Thelampwillalsoilluminatewhena
DPFregenerationoradditionofDiesel
ExhaustFluidisrequired.Another
functionofthecheckenginelampisto
warntheoperatorofanimpendingidle
shutdown.Whentheidleshutdown
timeris30secondsfromexpiring,the
engineECMbeginsashingthecheck
enginewarninglamponcepersecond.
Whenthetimerexpires,theECMwill

turnoffthewarninglampandshut
downtheengine.

3

3-

3

OperatingInstructions

StopEngineLamp

Thestopenginewarninglampwill

3

illuminate,andanaudibletonewill
sound,whenamajorengineproblem
exists.

WARNING:Thisshouldbe
consideredanemergency.
Youshouldstopthevehicle
assafelyaspossibleand
turnOFFtheignition.The
vehiclemustbeserviced
andtheproblemcorrected
beforedrivingagain.Failure
tocomplymayresultin
personalinjury,severe
enginedamage,equipmentor
propertydamage.

Forengineswiththeengineprotection
shutdownfeatureenabled,the
stopenginelampwillbeginto
ash30secondsbeforetheengine
automaticallyshutsdown.The
warninglampalertstheoperatortothe
impendingshutdown.

Thelampwillalsoilluminatewhen
theDieselExhaustFluid(DEF)tank
isalmostemptyorthesootlevelin
theDPFisatfullcapacity .Atthis
levelwarning,regenerationcannotbe
performedandenginepowerwillbe
derated.

DieselParticulateFilter(DPF)
WarningLamp

DPFWarningLamp

RefertoEngineAftertreatment
SystemsOperator’sManualfor
additionalinformation.

3-

4

OperatingInstructions

HighExhaustSystemT emperature
(HEST)WarningLamp

HESTWarningLamp

RefertoEngineAftertreatment
SystemsOperator’sManualfor
additionalinformation.

CheckEngineLamp(CEL)

CheckEngineLamp

RefertoEngineAftertreatment
SystemsOperator’sManualfor
additionalinformation.

DieselEmissionFluid(DEF)Lamp

DieselEmissionFluid(DEF)Lamp

RefertoEngineAftertreatment
SystemsOperator’sManualfor
additionalinformation.

3

3-

5

OperatingInstructions

EngineOperatingRange

GeneralInformation

CAUTION:Operatingthe
engineatfullthrottlebelow
peaktorquewillshorten
enginelifetooverhaul,
cancauseseriousengine

3

damage,andisconsidered
engineabuse.Donot
operatetheengineatfull
throttleoperationbelowpeak
torquerpmformorethan30
seconds.Failuretocomply
mayresultinequipmentor
propertydamage.

PACCARenginesaredesignedto
operateatfullthrottleundermomentary
conditionsdowntopeaktorqueengine
speed.Thisisconsistentwith
recommendedoperatingpractices.

CAUTION:Operatingthe
enginebeyondthemaximum
enginespeedcancause
severeenginedamage.Use
properoperatingtechniques
forthevehicletoprevent
engineoverspeed.The
maximumenginespeed
specicationislisted
inthe“GeneralEngine
Specications”onpage5-10.
Failuretocomplymayresult
inequipmentorproperty
damage.

EngineBrakingSystem

WARNING:Donotoperate
theenginecompression
brakewhendriving/operating
yourvehiclebobtailorwith
aloadedorunloadedtrailer
onroadsurfaceswithpoor
traction(wet,icy,orsnow
coveredroads)orinheavy
trafc.Brakingcausedby
thenormaloperationof
theenginecompression
brakecouldcauseyouto
losecontrolofthevehicle
resultinginaninjuryaccident.
Failuretocomplymayresult
indeath,personalinjury,
equipmentorproperty
damage.

WARNING:Theservice
brakesmustbeusedinan
emergency.Theengine
compressionbrakealone
mightnotstopthevehicle

3-

6

OperatingInstructions

fastenoughtoprevent
anaccident.Theengine
compressionbrakeisNOT
intendedastheprimarybrake
forthevehicle,norisitan
emergencybrake.Theengine
compressionbrakeonly
helpstheservicebrakesby
usingenginebackpressure
toslowthedrivetrain.Use
theservicebrakesforquick
stops.Youcouldbeseriously
injuredifyoureliedonly
ontheenginecompression
braketostopthevehicleinan
emergency.Failuretocomply
mayresultindeath,personal
injury,equipmentorproperty
damage.

WARNING:Donotuse
thecompressionbrake
whenoperatingonroad
surfaceswithpoortraction
(suchaswet,icy,orsnow
coveredroadsorgravel).

Compressionbrakescan
causethewheelstoskidon
aslipperysurface.Youcould
losecontrolofthevehicle
and/orjackknifeifthewheels
begintoskid,resultinginan
accident.Failuretocomply
mayresultindeath,personal
injury,equipmentorproperty
damage.

NOTE:Ifyourvehicleis
equippedwithanti-lock
brakes(ABS),operationof
thecompressionbrake(ifturned
ON)maybeinterruptedifthe
ABSsystemdetectswheelslip
duetooperationonslippery
surfaces.

Anenginecompressionbrakeis
standardonthePACCARMX
engine.Whenactivated,theengine
compressionbrakecreatesabraking
effectonthedrivewheels.This
deviceusesenginepowertoslow

thevehicledown.Becauseitcan
helpkeepyourvehicle’sbrakesfrom
overheating,itcansavewearandtear
ontheservicebrakes.However,the
enginecompressionbrakeisnotan
emergencybrake.

Ideally(onnormalroadsurfaces),
youshouldslowyourvehiclewiththe
compressionbrake(wherepermitted
bylaw)andusetheservicebrakesonly
forstoppingcompletely.Operatingthis
waywillgreatlyprolongthelifeofthe
servicebrakes.

3

3-

7

OperatingInstructions

CompressionBrake

Withthecompressionbrakeswitch
ON,thebrakeautomaticallycreatesits
brakingeffectwhenyouremoveyour
footfromtheacceleratorpedal.

Thebrakeswitchislocatedonthe
accessorydashpanel.Itcontrols

3

whetherthebrakeisON(readytoslow
thevehicledown)orOFF(nobraking
action).

•Donotusetheengine

compressionbraketoslow
thevehicledownwhenyouare
bobtailingorpullinganempty
trailer.

•MakesurethebrakeisOFFbefore

startingtheengine.

•Aftertheengineisstarted,warmed

up,andyouarereadytogetunder
way,turntheenginecompression
brakeswitchONforaddedbraking
effect.

NOTE:Ifyourvehicleis
equippedwiththeEaton
Vorad®system,operationof
thecompressionbrakemaybe
automaticallyactivated.

CompressionBrakeControls

Two(2)switchesonthedashpanel
controltheenginecompressionbrake.
AmasterswitchturnsthesystemON
orOFF .Asecondswitch,located
nexttothemasterswitch,controls
thebrakingeffect.Thisswitchallows
youtochooseprogressivelystronger
brakingtoslowthevehicledown.

Enginecompressionbrakecontrols
include:

•On/Offswitch.

•3-positionselectorswitch.

•Clutchswitch.

•Throttlesensor.

•Servicebrakepressureswitch.

•EatonVorad®Anti-LockBraking

System

Engagingconditionsfortheengine
compressionbrakeare:

3-

8