Paccar PX-9 Operator's Manual - page 32
OPERATING INSTRUCTIONS
Other switches for cruise control that
affect engine brake operations are:
•
Service brake air pressure switch
(if service brake actuator feature
is selected).
•
Clutch switch.
•
Throttle sensor.
The ECM allows the engine brakes
to operate while the cruise control is
turned on.
The two-position selector switch
(standard) or three-position (optional)
is located next to the “ON/OFF” switch
in the cab, and allows you to select the
retarding power of one or two brakes.
1
Switches
On/Off
CC/PTO
Clutch
Service
Throttle
Brake
“LOW” activates the engine brake on
three cylinders, and “HI” activates the
engine brake on six cylinders.
Signals from the “ON/OFF” switch,
clutch switch, throttle sensor, and the
cruise/PTO switches are fed into the
ECM.
NOTE
Any one of these switches can
de-activate the engine brakes.
The ECM then electronically enables
or disables the engine brakes.
3-12
Y53-1185-1B1
(12/2014)
3