IMPORTANT: Lubricate the new O-rings prior to
installation.
6. Install the new small O-ring in the groove on the
bottom of the new coalescent filter.
7. Insert the coalescent filter with the O-ring end
going into the air dryer opening first. The end of
the filter with the "X" will then be facing out.
8. Install the other new O-ring over the threaded
neck of the desiccant cartridge.
9. Screw on the desiccant cartridge until resistance
is detected. Then, tighten the cartridge 1/4 to 3/4
of a turn by hand.
10. Before placing the vehicle in service, perform the
test below.
10.1 Start the engine and build air pressure to
120 psi (827 kPa).
10.2 Listen for the purge valve to open and
release air. A large volume of air will be
expelled, followed by a slow flow of air
lasting approximately 30 seconds.
10.3 Shut down the engine.
10.4 Perform the inspections in
Maintenance
Operation 42–02.
Bendix AD-IP
1. Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2. Using a wrench or a socket, loosen the desiccant
cartridge bolt. Then separate the desiccant car-
tridge from the end cover.
3. Pull the cartridge bolt out of the cover and re-
move the cartridge.
WARNING
Do not attempt to disassemble the desiccant car-
tridge assembly. Parts for the assembly are not
available and the cartridge contains a 150 lb
spring that cannot be mechanically caged. Disas-
sembly could release the spring, resulting in per-
sonal injury.
4. Remove and discard both O-rings from the car-
tridge bolt.
5. Using a clean rag, wipe clean the inside of the
end cover. Clean the cartridge bolt bore in the
end cover, and the sealing surfaces for the large-
and small-diameter desiccant cartridge sealing
rings.
6. Inspect the end cover for physical damage, then
inspect all air line fittings for corrosion; replace
as necessary.
7. Clean and inspect the bolt, paying attention to
the threads and O-ring grooves.
IMPORTANT: Use only the grease supplied with
Bendix replacement kits.
8. Lubricate the O-rings, bolt O-ring grooves, seal-
ing rings, and cartridge grooves. Lubricate the
end cover bore for the bolt.
9. Install both O-rings on the cartridge bolt, then,
using a twisting motion, insert the assembled
desiccant cartridge bolt in the end cover.
10. Install the desiccant cartridge on the end cover,
making sure the cartridge is properly seated and
flush on the end cover.
NOTE: It may be necessary to rotate the car-
tridge slightly until the anti-rotation lugs are
properly aligned and allow the cartridge to rest
flush against the end cover.
11. Using a wrench or socket, tighten the desiccant
cartridge bolt 50 lbf·ft (68 N·m). Do not over-
torque.
12. Before placing the vehicle in service, perform the
test below.
12.1 Close all reservoir drain cocks.
12.2 Build system pressure to governor cut-
out, and note that the AD-IP air dryer
purges with an audible escape of air.
12.3 Fan the service brakes to reduce system
air pressure to governor cut-in. Note that
the system once again builds to full pres-
sure and is followed by a purge at the
AD-IP air dryer exhaust.
12.4 Check for excessive leakage around the
head of the desiccant cartridge where it
contacts the end cover. With the com-
pressor in loaded mode (compressing
air), apply a soapy solution to these
areas, and observe that any leakage
does not exceed a 1-inch bubble in 1
Brakes 42
Recreational Vehicle Chassis Maintenance Manual, July 2018 42/3
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