Bendix Commercial Vehicle Systems AD-IP INTEGRAL PURGE AIR DRYER 5/07 - Manual (Page 8)

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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 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 ® replacement parts,
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.
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 Antilock 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.
AD-IP ™ AIR DRYER REMOVAL
This air dryer removal process is presented in the event it
becomes necessary to replace the entire air dryer. Normal
service and parts replacement does not require
removal of the air dryer from the vehicle.
1. Park the vehicle on a level surface and prevent movement
by means other than the brakes.
2. Drain all reservoirs to 0 p.s.i. — Caution: Compressor
discharge line may still contain residual pressure.
3. Identify and disconnect the three air lines from the end
cover and note the position of end cover ports relative to
the vehicle.
4. Unplug the vehicle wiring harness from the heater and
thermostat assembly connector on the end cover
assembly.
5. Remove the four bolts that secure both the upper and
lower mounting brackets to the vehicle, and remove the
air dryer from the vehicle.
6. Mark the relationship of the saddle bracket (5) to the
end cover assembly (6). Remove the 5/16" cap screw
(1) and sleeve nut (3) securing the upper mounting strap
(4) to the saddle bracket (5). Earlier models used washer
and nut in place of the sleeve nut (3). Remove the upper
mounting strap (4) from the end cover assembly (6).
7. Mark the relationship of the lower bracket (9) to the end
cover assembly (6). Remove the two 3/8" end cover cap
screws (7) and two washers (8) that retain the lower
mounting bracket (9) to the end cover (6).
DISASSEMBLY
The following disassembly and assembly procedure is
presented for reference purposes and presupposes that a
major rebuild of the AD-IP
™ air dryer is being undertaken.
The replacement parts and maintenance kits available
generally do not require full disassembly. The instructions
provided with these parts and kits should be followed in lieu
of the instructions presented here. Refer to Figure 9 during
disassembly.
Caution: While performing service on the AD-IP ™ air dryer,
it is not recommended that a clamping device (vise, C-clamp,
etc.) be used to hold any die cast aluminum component as
damage may result. To hold the end cover, install a pipe
nipple in the supply port and clamp the nipple into a vise.
1. Using an adjustable or socket wrench, loosen the
desiccant cartridge bolt (10), then separate the desiccant
cartridge (11) from the end cover (6). Pull the desiccant
cartridge bolt out of the end cover (6).
Caution: Disassembly of the desiccant cartridge
assembly should not be attempted! Detail parts for the
cartridge are not available and the cartridge contains a
150# spring which can not be mechanically caged.
2. Remove both o-rings (12 & 13) from the desiccant
cartridge bolt.
3. Remove the retaining ring (14) that secures the purge
valve assembly (15) in the end cover (6).
4. Remove the 1/4" shoulder bolt (16) from the bottom of
the purge valve housing assembly (19) using a 3/8"
socket wrench and a large blade screw driver, inserted
in the slot on top of the purge piston (20). Remove the
exhaust diaphragm (17), and the purge valve (18) from
the purge valve housing (19).
5. Remove the o-rings (23 & 24) from the purge valve housing
(19). Discharge Line Unloader (DLU) models do not have
o-ring (23).
6. Remove the purge piston (20) and the return spring (22).
7. Remove the o-ring (21) from the purge piston (20).