freightliner Custom Classic MT45 2022, Maintenance Manual

Page: 98 / 138

42–07 Air Dryer Desiccant and
Coalescent Filter
Replacement
Bendix AD-9
1. Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2. Completely drain all air reservoirs. Air pressure
gauges should read 0 psi (0 kPa).
3. Loosen the desiccant cartridge with a strap
wrench at the base of the cartridge. Spin off the
cartridge and discard it.
4. Remove the O-ring from the threaded neck and
discard it.
5. Remove the coalescent filter and discard it.
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 checks in Maintenance Op-
eration 42–10 .
Haldex PURest
1
NOTE: The PURest cartridge contains both the
desiccant and filter in one piece.
1. Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2. Remove the four mounting bolts and discard.
See
Fig. 9 . Lift the canister about 1/2 inch and
remove.
3. Place the assembly upside-down as shown in
Fig. 10 . Press the cartridge down to compress
the rubber spring then rotate counterclockwise
45 degrees to release the cartridge. The car-
tridge itself contains no hazardous material, but
there may be a small amount of oil from the
compressor.
4. Clean the inside of the canister and aluminum
housing.
5. Remove the cartridge O-ring and discard.
6. Remove the new cartridge from the kit and make
certain the rubber spring is attached. See
Fig. 11 .
1Information in this section is provided by Haldex and is used with permis-
sion.
06/17/2010 f430511
1
2
2
3
3
4
5
6
7
7
1. Yoke
2. Yoke Pin
3. Link Pin
4. Link
5. Boot
6. Lube Fitting
7. Worm Gear
Fig. 8, Bendix Automatic Slack Adjuster
Brakes
42
Walk-In Van Chassis Maintenance Manual, October 2019
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