Compressor Troubleshooting; Removal And Disassembly; Discharge Valve Leakage; Personal Injury Or Death - BENDIX BX2150 AIR COMP-BW1424- Manual

as to leakage, it is recommended that a genuine Bendix
unloader kit be installed and the cylinder head retested.

DISCHARGE VALVE LEAKAGE

Unloader piston leakage must be repaired before this test is
performed. Leakage past the discharge valve can be detected
by removing the discharge line, applying shop air to the
unloader mechanism and the discharge port and listening
for the escape of air at the compressor inlet cavity. A barely
audible escape of air is generally acceptable; however, if
there is any question as to the leakage rate, it is
recommended that the cylinder head or compressor be
removed and repaired or replaced. With shop air still applied
at the discharge port, apply a soap solution to the valve stop
recess on the top of the head. If leakage is detected, the
cylinder head must be repaired or replaced. Only genuine
Bendix remanufactured compressors or service parts and
kits should be used.

COMPRESSOR TROUBLESHOOTING

IMPORTANT: The troubleshooting contained in this section
considers the compressor as an integrated component of
the overall air brake charging system and assumes that an
air dryer is in use. The troubleshooting presented will cover
not only the compressor itself, but also other charging system
devices as they relate to the compressor.
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS

PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following
general precautions should be observed at all times.
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle.
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle's air
brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work on
the vehicle. If the vehicle is equipped with an
™
AD-IS air dryer system or a dryer reservoir module,
be sure to drain the purge reservoir.
5. Following
6. Never exceed manufacturer's recommended
7. Never connect or disconnect a hose or line
8. Use only genuine Bendix
9. Components with stripped threads or damaged
10. Prior to returning the vehicle to service, make
11. For vehicles with Antilock Traction Control (ATC),
COMPRESSOR REMOVAL & DISASSEMBLY
TO AVOID
GENERAL
The following instructions are presented here for reference.
Removal and disassembly of the compressor is not
recommended unless the appropriate service parts and/or
kits are on hand.
REMOVAL
These instructions are general and are intended to be a
When
guide, in some cases additional preparations and precautions
are necessary.
1. Block the wheels of the vehicle and drain the air pressure
2. Drain the engine cooling system and the cylinder head
3. Remove the governor and any supporting bracketry
4. Remove the discharge port and inlet cavity fittings, if
5. Remove the flange or base mounting bolts and remove
the vehicle
recommended procedures, deactivate the electrical
system in a manner that safely removes all electrical
power from the vehicle.
pressures.
containing pressure; it may whip. Never remove a
component or plug unless you are certain all
system pressure has been depleted.
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
certain all components and systems are restored to
their proper operating condition.
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a
drive axle are lifted off the ground and moving.
from all the reservoirs in the system.
of the compressor. Identify and disconnect all air, water
and oil lines leading to and from the compressor.
attached to the compressor and note their positions on
the compressor to aid in reassembly.
applicable, and note their position on the compressor
to aid in reassembly.
the compressor from the vehicle.
manufacturer's
®
replacement parts,
9