Paccar MX-11, Operator'S Manual

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recommended operating pressures and
temperatures. Shut off the engine if any
pressure or temperature does NOT meet
the specifications.
Manual Transmission Variable Idle
Control
NOTE
If your truck is equipped with a manual
transmission, your engine idle RPM may
vary under certain conditions. The en-
gine control module will control the RPM
based on various inputs such as vehicle
weight, rear axle ratio, road grade and
altitude. When starting from a stop, de-
pending on these conditions, the engine
RPM may increase to compensate for
load in order to ensure a smooth transi-
tion into motion.
Engine Operating Range
CAUTION
Operating the engine at full throttle be-
low peak torque will shorten engine life
to overhaul, can cause serious engine
damage, and is considered engine
abuse. DO NOT operate the engine at
full throttle operation below peak tor-
que rpm for more than 30 seconds.
Failure to comply may result in equip-
ment or property damage.
PACCAR engines are designed to operate
at full throttle under momentary conditions
down to peak torque engine speed. This is
consistent with recommended operating
practices.
CAUTION
Operating the engine beyond the max-
imum engine speed can cause severe
engine damage. Use proper operating
techniques for the vehicle to prevent
engine overspeed. See Engine Speci-
fications for maximum engine speed.
Failure to comply may result in equip-
ment or property damage.
Extended Idling
CAUTION
Prolonged periods of idling can result
in lower than optimal engine/transmis-
sion operating temperatures which
could cause increased rates of wear.
An idle shutdown feature (available on
PACCAR engines) can be program-
med to shut the engine down after a
period of low idle operation with no
driver activity. A flashing warning lamp
will inform the driver of an impending
shutdown. Failure to comply may re-
sult in equipment or property damage.
CAUTION
If the truck is equipped with power
take-off (PTO) equipment, the engine
shutdown system can be deactivated
when the PTO is operational; however,
engine idle periods should not exceed
five minutes whenever possible. Fail-
ure to comply may result in equipment
or property damage.
ENGINE OPERATION - Operating Instructions
22 Y53-1166-1M1 (10/2020)
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