Bendix Commercial Vehicle Systems AD-SP SYSTEM PURGE AIR DRYER 10/04 - Manual (Page 13)

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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. Vertical check valve models: Remove the retaining
ring (30) that secures the delivery check valve
assembly in the end cover (6). Remove and separate
the perforated plate (26), spring (27), check valve body
(28) and o-ring (29).
5. Horizontal check valve models: Remove delivery
check valve plug (23) that secures the check valve
assembly in the end cover (6). Remove the spring
(24), check valve (25) and o-ring (2).
6. Remove the retaining ring (20) that secures the heater
and thermostat assembly (21) in the end cover (6).
Gently pull the heater and thermostat (21) out of the
end cover (6) and remove the o-ring (19).
7. Using a 9/16” wrench, remove the safety valve
assembly (22) from the end cover (6).
CLEANING & INSPECTION
1. Using mineral spirits or an equivalent solvent, clean
and thoroughly dry all metal parts except the desiccant
cartridge.
2. Inspect the interior and exterior of all metal parts that
will be reused for severe corrosion, pitting and cracks.
Superficial corrosion and/or pitting on the exterior
portion of the end cover is acceptable.
3. Inspect the bores of both the end cover and the purge
valve housing for deep scuffing or gouges.
4. Make certain that all purge valve housing and end cover
passages are open and free of obstructions.
5. Inspect the pipe threads in the end cover. Make certain
they are clean and free of thread sealant.
6. Make certain that the purge orifice in the cartridge bolt
is open and free of obstructions.
7. Inspect all air line fittings for corrosion. Clean all old
thread sealant from the pipe threads.
8. All o-rings removed should be discarded and replaced
with new o-rings provided in appropriate kit(s).
ASSEMBLY
For purge valve assembly instructions refer to the
instruction sheet included in the kit. A listing of maintenance
kits is included in this document.
1. Complete the purge valve installation per the installation
instructions provided in the service kit.
2. Using a 9/16” wrench, install the safety valve assembly
(22) into the end cover (6).
3. Vertical check valve models: See Figure 9. Install
the o-ring (29) on the check valve body (28) and push
the o-ring down, over the 3 guide lands until it is in the
o-ring groove of the check valve body (28). Install the
check valve spring (27) on the check valve body so that
the small coils of the spring slip over the check valve
body. Install the assembled check valve body, o-ring,
and spring (27, 28 & 29) in the end cover (6) so that
the o-ring rests on its seat in the end cover (6) and the
spring is visible. Install the perforated plate (26), in the
end cover (6) and secure the check valve assembly
using the retaining ring (30). Make certain the retaining
ring is fully seated in its groove in the end cover (6).
4. Horizontal check valve models: Install o-ring (2) onto
check valve (25). Place the check valve in the delivery
check valve port of the end cover (6). Install the spring
(24) over the delivery check valve (36) and secure with
the delivery check valve plug (23).
5. Install the o-ring (19) on the heater and thermostat
assembly (21). After making certain the sponge rubber
cushion is positioned between the connector body and
thermostat, gently push the heater and thermostat
assembly (21) into the end cover (6), making certain
the heating element enters the small diameter bore in
the larger heater and thermostat bore in the end cover
(6). Secure the heater and thermostat assembly in the
body using the retaining ring (20). Make certain the
retaining ring is fully seated in its groove in the end
cover (6).
6. Lubricate the o-rings (12 & 13) and install them on
the desiccant cartridge bolt (10) and using a twisting
motion, insert the assembled desiccant cartridge bolt
in the end cover (6).
7. Install the desiccant cartridge (11) on the end cover
(6) making certain the cartridge is properly seated and
flush on the end cover.
Note: It may be necessary to rotate the cartridge slightly
until the anti-rotation lugs are properly aligned and allow
the cartridge to rest flush against the end cover.