Paccar PX-9 - Page 32

OPERATINGINSTRUCTIONS
Otherswitchesforcruisecontrolthat
affectenginebrakeoperationsare:
•Servicebrakeairpressureswitch
(ifservicebrakeactuatorfeature
isselected).
•Clutchswitch.
•Throttlesensor.
TheECMallowstheenginebrakes
tooperatewhilethecruisecontrolis
turnedon.
Thetwo-positionselectorswitch
(standard)orthree-position(optional)
islocatednexttothe“ON/OFF”switch
inthecab,andallowsyoutoselectthe
retardingpowerofoneortwobrakes.
1Switches
On/OffCC/PTO
ClutchService
ThrottleBrake
“LOW”activatestheenginebrakeon
threecylinders,and“HI”activatesthe
enginebrakeonsixcylinders.
Signalsfromthe“ON/OFF”switch,
clutchswitch,throttlesensor,andthe
cruise/PTOswitchesarefedintothe
ECM.
NOTE
Anyoneoftheseswitchescan
de-activatetheenginebrakes.
TheECMthenelectronicallyenables
ordisablestheenginebrakes.
3-12Y53-1185-1B1(12/2014)
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