Paccar PX-9 Operator's Manual - page 34
OPERATING INSTRUCTIONS
CAUTION
DO NOT operate the engine brake
until the engine oil temperature is
above 86°F (30°C). Operation be-
low 86°F (30°C) could cause se-
vere damage to the engine. Idle
the engine four minutes at approx-
imately 1000 RPM to warm the en-
gine before activating the engine
brakes.
To activate the engine brakes, switch
the “ON/OFF” switch to the “ON”
position. Once activated, the operation
of the engine brake is fully automatic.
NOTE
See the “Tips for Operation” steps
in this section for specific informa-
tion about engine brake operation
under certain road conditions.
NOTE
The engine brakes are designed to
assist the vehicle's service brakes
when slowing the vehicle to a stop.
Remember, service brakes will be
required to bring the vehicle to a stop.
CAUTION
Using the engine brakes to aid in
clutchless gear shifting will cause
the engine to stall or lead to en-
gine damage. Engine brakes used
in clutchless shifting causes addi-
tional strain on the engine valve
train and causes severe internal
engine damage. DO NOT use en-
gine brakes to assist in gear shift-
ing.
The ECM will disable the engine
brakes when engine speed is below
3-14
Y53-1185-1B1
(12/2014)
3