Bendix Commercial Vehicle Systems AD-RP PuraGuard Oil Coalescing Remote Purge Air Dryers - Manual (Page 9)

9
DISASSEMBLY FOR PART REPLACEMENT AND
KIT INSTALLATION
1. The following disassembly and assembly procedures
are presented for reference and assumes that the
appropriate Bendix
® AD-RP ™ air dryer kits are on hand.
The instructions provided with these parts and kits
should be followed instead of the instructions presented
here.
2. The replacement parts and maintenance kits that are
available do not require full disassembly and in most
cases do not require the removal of the AD-RP air dryer
from the vehicle.
3. If removal of the air dryer is necessary, adhere to the
following caution:
CAUTION: While performing service on the AD-RP 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 body, install
a pipe nipple in the supply port and clamp the nipple into
a vise.
DISASSEMBLY - TURBO CUT-OFF VALVE
1. Loosen the supply port line and allow any residual air
in the compressor discharge line to drain.
2. Remove the retaining ring from the body assembly, then
remove the turbo cut-off cap from the body. Remove
the turbo cut-off cap o-ring.
3. Remove the turbo cut-off piston from the body.
4. Remove the large and small diameter o-rings from the
piston.
DISASSEMBLY - PURGE/RELIEF VALVE
1. If so equipped, disconnect, remove and save the
exhaust line from the exhaust port of the air dryer.
2. Remove the retaining ring from the body assembly, then
remove the non-metallic exhaust cover and spring from
the body. Note: The spring exerts a 30 pound force
against the exhaust cover.
3. Carefully remove the purge piston from the body and
remove the o-ring from the purge piston.
4. The purge valve has two different sides. Note which
side is visible before removing the valve. Remove the
valve from the body.
DISASSEMBLY - HEATER AND THERMOSTAT
1. Disconnect the vehicle wiring harness connector that
mates with the heater and thermostat connector on the
body. Pry the lock tabs on the vehicle wiring harness
connector out, before removal from the air dryer
connector. Make sure the connector seal is present
on the vehicle wiring harness connector.
2. Remove the retaining ring that secures the heater and
thermostat in the body.
3. Carefully pull the heater and thermostat assembly
straight out of the body.
4. Remove the o-ring from the heater connector.
DISASSEMBLY - DESICCANT CARTRIDGE
1. Place a strap wrench, or equivalent tool, on the
desiccant cartridge next to the lip low on the cartridge.
Rotate counterclockwise to remove the desiccant
cartridge.
CLEANING, INSPECTION AND ASSEMBLY
PREPARATION
1. Clean the exterior of the body.
2. Using a clean rag, wipe the body bores clean.
3. Inspect for physical damage to the body casting, broken
and/or missing parts.
4. Inspect the interior and exterior of the body for severe
corrosion, pitting and cracks. Superfi cial corrosion and/
or pitting on the exterior portion is acceptable.
5. Inspect the bores, valve seating and o-ring contact
areas for deep scuffi ng or gouges or nicks that would
not permit an air tight seal.
6. Inspect the pipe threads in the body. Make certain they
are clean and free of thread sealant.
7. Inspect the purge valve piston seat for nicks and
excessive wear.
8. Inspect all air line fi ttings for corrosion. Clean all old
thread sealant from the pipe threads.
9. All o-rings removed should be discarded and replaced
with new o-rings provided in the appropriate kit(s).
10. Lubricate the body bores and o-ring grooves, in the
body and components, with the grease supplied in the
Bendix
® maintenance kits.
11. Lubricate all o-rings with the grease supplied in the
Bendix maintenance kits. Any component exhibiting a
condition described in steps 3 to 8 should be replaced.