REMOVAL AND INSTALLATION
REMOVAL
1. Block and hold the vehicle by means other than the air
brakes.
2. Drain the air brake system reservoirs.
3. If the entire Bendix
®
R-12DC
®
valve is to be removed,
identify the air lines to facilitate the installation. Prior
to disassembly, remove as much contamination as
possible from the exterior of the device taking care to
keep all contamination from entering the open ports.
4. Disconnect the air lines from the valve*.
5. Remove the valve from the reservoir or if remotely
mounted, remove the mounting bolts and then the
valve.
*It is generally not necessary to remove the entire valve
to service the inlet/exhaust valve. The inlet/exhaust valve
insert can be removed by removing the snap ring, exhaust
cover assembly, and then the inlet/exhaust valve.
Drain all reservoirs before attempting to remove the inlet
exhaust valve.
DISASSEMBLY
NOTE: Prior to disassembly, mark the location of the
mounting bracket to the cover and the cover to the body.
The valve body may be lightly clamped in a bench vise
during disassembly, however, over-clamping will result
in damage to the valve and result in leakage and/or
malfunction. If a vise is to be used, position the valve so
that the jaws bear on the supply ports on opposing sides
of the valve’s body. (
See Figure 1
).
1. Remove the four cap screws securing the mounting
bracket and cover to the body. Retain the cap screws
for reuse.
2. Discard the mounting bracket.
3. Remove and discard the sealing o-ring (5) from the
valve cover.
a. Remove the two Torx
®
screws securing the double
check cover to the valve cover.
b. Remove the double check cover from the valve
cover and remove and discard the valve spring
(1), check valve guide (2), check valve (3), and
o-ring (4).
4. Remove and discard the sealing o-ring (5) from the
cover, and mounting bracket.
2
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
guidelines should be observed AT ALL TIMES:
▲
Park the vehicle on a level surface, apply the parking
brakes and always block the wheels. Always wear personal
protection equipment.
▲
Stop the engine and remove the 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.
▲
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.
▲
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, a Bendix
®
DRM
™
dryer reservoir module, or a Bendix
®
AD-9si
®
air
dryer, be sure to drain the purge reservoir.
▲
Following the vehicle manufacturer’s recommended
procedures, deactivate the electrical system in a manner
that safely removes all electrical power from the vehicle.
▲
Never exceed manufacturer’s recommended pressures.
▲
Never connect or disconnect a hose or line containing
pressure; it may whip and/or cause hazardous airborne
dust and dirt particles. Wear eye protection. Slowly open
connections with care, and verify that no pressure is
present. Never remove a component or plug unless you are
certain all system pressure has been depleted.
▲
Use only genuine Bendix
®
brand replacement parts,
components and kits. Replacement hardware, tubing, hose,
fi ttings, wiring, etc. must be of equivalent size, type and
strength as original equipment and be designed specifi cally
for such applications and systems.
▲
Components with stripped threads or damaged parts should
be replaced rather than repaired. Do not attempt repairs
requiring machining or welding unless specifi cally stated
and approved by the vehicle and component manufacturer.
▲
Prior to returning the vehicle to service, make certain all
components and systems are restored to their proper
operating condition.
▲
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.
▲
The power MUST be temporarily disconnected from the
radar sensor whenever any tests USING A DYNAMOMETER
are conducted on a vehicle equipped with a Bendix
®
Wingman
®
system.
▲
You should consult the vehicle manufacturer's operating
and service manuals, and any related literature, in
conjunction with the Guidelines above.
