Operation
Air Compressor Cycling
The MaxxForce® 11, 13 and 15 liter engines can be equipped
with one of two different types of air compressor and may have
one or two cylinders.
•
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.
•
Clutched Air Compressor:
This high-capacity,
two
cylinder, air compressor is periodically engaged by using
an on-off clutch. It works in conjunction with air governor
and air dryer to pump air to the air dryer and air tanks.
When additional compressed air is not needed, the clutch
is disengaged, compressor speed goes to zero, and all
air pumping ceases. This system provides relatively low
cylinder temperatures and sound verses other compressors
during the unloaded cycle. It is used to promote maximum
fuel economy by eliminating pumping energy loss during
the unloaded cycle.
As the compressor reaches approximately 130 psi (896 kPa),
the air governor will, through various methods, stop the air
compressor from pumping pressurized air to the air system.
When the air pressure reaches approximately 110 psi (758
kPa), the governor signals the air compressor to resume
pumping pressurized air to the air system.
During normal
engine operation, this cycle will be evident by the fluctuation of
the primary air tank pressure gauge.
Cooling System
WARNING
To
prevent
personal
injury
or
death
from
hot coolant or steam, use only the following
procedure to remove the pressure cap from the
radiator or expansion tank. Allow the engine to
cool first. Wrap a thick, heavy cloth around the
cap. Unscrew the cap slowly to allow pressure
to release from under the cap. After the pressure
has been released, the pressure cap may be
removed.
WARNING
Exercise great care when working on vehicles
with running engines that are equipped with
an automatic fan clutch.
The fan engages
when engine coolant reaches a predetermined
temperature
or
the
refrigerant
pressure
(if
equipped
with
air
conditioning)
reaches
a
predetermined setting.
The fan will start with
no advance warning.
Failure to observe these
precautions could result in vehicle damage,
personal injury or death.
3878859R2
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Summary of Contents for ProStar+ Eagle Series.
Page 4: ...Operator s Manual ProStar Series Printed in the United States of America 3878859R2 ...
Page 12: ...Table of Contents Section 10 Index Index 235 viii 3878859R2 ...
Page 26: ...Model Description Exterior Components 14 3878859R2 ...
Page 28: ...Model Description 16 3878859R2 ...
Page 59: ...Controls Features 3878859R2 47 ...
Page 70: ...Controls Features Declination Zone Map 58 3878859R2 ...
Page 93: ...Controls Features Center Dash Panel Wing Panel 3878859R2 81 ...
Page 128: ...Sleeper Features 116 3878859R2 ...
Page 182: ...Operation 170 3878859R2 ...
Page 241: ...Maintenance Intervals and Specifications Typical Interior Fuse Panel Layout 3878859R2 229 ...
Page 262: ...Index 250 3878859R2 ...