AIR SYSTEM
Air Compressor
5. Start the engine and build up the
Operation
air pressure
again.
6. Stop the
engine, and apply the
All compressors, regardless of make
brakes fully. Apply the brake pedal
or model, run continuously while the
and hold it down for ve minutes.
engine is running. System pressure
The pressure drop should not
is controlled by the governor. The
exceed 3.0 psi (21 kPa) per
governor acts in conjunction with
minute.
the unloading mechanism in the
compressor cylinder
block to start
7. If you
detect excessive leakage
and stop
compression of air. The
(air pressure
loss greater than 3.0
compressor is
unloaded when the
psi (21
kPa) after ve minutes of
system pressure
reaches 120 psi (827
brake application),
a leakage test
kPa) and
compression is reestablished
should be
made at the air line
when system
pressure falls to 100 psi
connections and
at all air brake
(690 kPa).
control units.
These tests should
determine where air is escaping.
(04/13) Y53-6047–2C
Preventive Maintenance
The following
service checks are
provided for your information only and
should be performed by a certied
mechanic. Contact your dealer or the
engine manufacturer's Maintenance
Manual for further information on
servicing air compressors.
After completing
any repairs to the air
system, always test for air leaks, and
check the brakes for safe operation
before putting the vehicle in service.
Below is
a list of areas to maintain for
the air compressor:
• Inspect compressor air lter
element, if so equipped, and
replace element if clogged. Check
compressor mounting and drive
for alignment and belt tension.
Adjust if necessary.
• Remove compressor discharge
valve cap nuts and check for
5-55
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