Paccar PX-9, Operator'S Manual

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details. If the lamp illuminates but the level
is full, seek service immediately for DEF
fluid quality or DEF equipment repair.
Engine Wait-to-Start Light
This warning icon will appear when the
system needs some time before attempting
to start the engine. The light will illuminate
at key ON, and will stay on for a period of
up to 30 seconds.
NOTE
The length of time the 'Wait-To-Start'
lamp remains illuminated depends on
the ambient temperature. The lower
the ambient temperature, the longer
the lamp will be illuminated.
Once the Wait-to-Start light turns off, turn
the key to the starting position to start the
engine.
You may see this appear if the system has
detected a situation where the starter is too
hot and needs to cool down. Alternatively,
you may see it when the engine grid heater
is on and needs some time to warm up.
NOTE
Some engines are equipped with an
engine starting motor protection fea-
ture. If the starting motor is engaged
for 30 or more seconds, without the
engine starting, the starter will be
locked out from operating, allowing for
proper cooling of the starting motor.
During this time, the 'Wait-To-Start'
lamp will flash for 2 minutes. Once the
lamp stops flashing, the starting motor
will be allowed to function.
Engine Braking System
An engine compression brake is standard
on the PX-9 engines. Optionally, this
engine may be equipped with an exhaust
brake. When activated, these devices
supplement the service brakes by creating
a braking effect on the drive wheels,
helping keep your vehicle's service brakes
from overheating and/or from additional
wear and tear. The engine compression
brake or exhaust brake is not an
emergency brake nor intended to replace
the service brakes.
WARNING
DO NOT operate the engine compres-
sion brake or exhaust brake when driv-
ing/operating your vehicle bobtail or
with a loaded or unloaded trailer on
road surfaces with poor traction (wet,
icy, or snow covered roads) or in
heavy traffic. There may not be
enough weight on the rear axle to pro-
vide traction. Braking caused by the
normal operation of the engine com-
pression brake or exhaust brake could
cause you to lose control of the vehi-
cle, resulting in an accident. Make
sure the engine compression brake or
exhaust brake is switched "OFF" when
driving bobtail or with an unloaded
trailer. Failure to comply may result in
death, personal injury, equipment, or
property damage.
ENGINE OPERATION - Operating Instructions
Y53-1185-1J1 (10/21) 17
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