Bendix Commercial Vehicle Systems 720CC COMPRESSOR - Manual (Page 7)

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leakage can generally be detected by longer compressor
build-up and recovery times. Compare current compressor
build-up times with the last several recorded times. Make
certain to test for air system leakage, as described under “In-
Service Operating Tests”, before making a determination that
performance has been lost.
COMPRESSOR REMOVAL & DISASSEMBLY
GENERAL
The following disassembly and assembly procedure is
presented for reference purposes and pre-supposes that
a rebuild or repair of the compressor is being undertaken.
Several maintenance kits are available and the instructions
provided with these parts and kits should be followed in lieu
of the instructions presented here.
MAINTENANCE KITS & SERVICE PARTS
BENDIX ® 720 CC TWIN CYLINDER COMPRESSOR
Compressor Seal Kit (Major) . . . . . . . . . . .K026808
Compressor Seal Kit (Minor) . . . . . . . . . . .K051352
Discharge Safety Valve Kit . . . . . . . . . . . .K026809
Compressor to Engine Supplied by the
Mounting Face Sealant . . . . . . . Engine Manufacturer
GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID 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. When 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 a Bendix ® AD-IS ® air dryer system or
a dryer reservoir module, be sure to drain the purge
reservoir.
5. Following the vehicle manufacturer’s recommended
procedures, deactivate the electrical system in a
manner that safely removes all electrical power from
the vehicle.
6. Never exceed manufacturer ’s recommended
pressures.
7. Never connect or disconnect a hose or line containing
pressure; it may whip. Never remove a component
or plug unless you are certain all system pressure
has been depleted.
8. Use only genuine Bendix ® brand replacement parts,
components and kits. Replacement hardware,
tubing, hose, fi ttings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifi cally for such applications and
systems.
9. Components with stripped threads or damaged
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.
10. Prior to returning the vehicle to service, make certain
all components and systems are restored to their
proper operating condition.
11. For vehicles with Automatic Traction Control (ATC),
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.
REMOVAL
In many instances it may not be necessary to remove the
compressor from the vehicle when installing the various
maintenance kits and service parts. The maintenance
technician must assess the installation and determine
the correct course of action. These instructions are
general and are intended to be a guide. In some cases
additional preparations and precautions are necessary.
In all cases follow the instructions contained in the
vehicle maintenance manual in lieu of the instructions,
precautions and procedures presented in this manual.
1. Block the wheels of the vehicle and drain the air
pressure from all the reservoirs in the system.
2. Drain the engine cooling system and the cylinder
head of the compressor. Identify and disconnect all
air, water and oil lines leading to the compressor.
3. Remove as much road dirt and grease from the
exterior of the compressor as possible.