Operation
NOTE: If the Oil/Water Warning Indicator comes ON, bring the
vehicletoasafestopandshuttheengineOFFbeforeshutdown
occurs.
Optional Coolant Warning Level System – 3 Way (08WWJ)
This option provides a warning if the coolant is below the safe
operating level.
NOTE: If the RedEngine Warning Indicator comes ON, bring the
vehicle to a safe stop and shut the engine OFF.
Optional Engine Protection System – 3 Way (08WPP)
WARNING
In the event engine shutdown occurs, make
certain that vehicle is safely off the roadway,
the 4-way emergency flashers are on, and the
warning devices are properly placed. Failure to
remove vehicle from roadway could result in an
accident, personal injury or death.
This system includes the 3-way engine warning system. In
addition, if engine oil pressure, excessive engine speed, engine
coolant temperature or engine coolant level conditions exceed
the warning limits, the appropriate fault codes are set and the
Red Engine Warning Indicator is turned ON. If the engine oil
pressure, engine coolant temperature or engine coolant level
conditions exceed the preset critical limit, the engine is shut
down. After an automatic shutdown, the engine can be restarted
and will operate in a de-rated mode for an additional 30 seconds
if the conditions causing the shutdown are still present (See
Automatic Engine Shut-Down and Restarting procedure).
AirCompressorCycling
The MaxxForce® 11 and 13 Liter engines can be equipped with
one of two different types of air compressor and may have one
or two cylinders.
• Direct Line Unloaded (DLU) Air Compressor: This
constantly engaged air compressor works in conjunction
with the air governor and air dryer to pump compressed air
to the air dryer and air tanks. When additional compressed
air is not needed, air is pumped to the atmosphere via the
muffler equipped, frame- mounted unloader valve. This
system provides relatively lower air compressor cylinder
temperatures verses head-unloaded compressors during
the unloaded cycle. It is normal to hear a small amount of
compressor-created sound during the unloaded cycle.
• Head Unloaded Air Compressor: This single cylinder,
constantly engaged air compressor works in conjunction
with the air governor and air dryer to pump compressed air
to the air dryer and air tanks. When additional compressed
air is not needed air is shut off from the air compressor
discharge line and confined to the air compressor cylinder
and its head. This system provides relatively higher cylinder
temperatures verses head-unloaded compressors during
the unloaded cycle, but does not require the plumbing and
complexity of the DLU compressor. It is relatively quieter
during the unloaded cycle than the DLU.
112 3879634R1
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