Paccar PX-9 Operator's Manual - page 33
OPERATING INSTRUCTIONS
NOTE
Engine brakes cannot be enabled:
•
When cruise control is active
and the engine brakes in cruise
control feature is turned off.
•
When engine speed goes
below 850 RPM.
•
When the engine computer
recognizes a system problem.
The throttle sensor is part of the
accelerator pedal assembly located in
the cab and will deactivate the engine
brakes when the acceleration pedal is
depressed.
The clutch switch uses the motion of
the clutch linkage to deactivate the
engine brakes when the clutch pedal
is depressed.
The service brake pressure switch
is attached to the service brake air
supply line.
Applying the service brakes while in
cruise control will disengage the cruise
control and enable the engine brakes.
If the pedal-activated engine brake
feature is enabled, the service brake
pedal must be depressed (tapped)
before the engine brakes will be
activated.
(12/2014)
Y53-1185-1B1
3-13
3