freightliner CL112 2015, Maintenance Manual

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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
second. If leakage exceeds this measure,
remove and re-install the desiccant
cartridge.
Bendix AD-9si and AD–IS Air
Dryers
1. Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2. Drain the air reservoirs.
3. Using a strap wrench or equivalent, loosen the
desiccant cartridge. See
Fig. 3 . Spin the car-
tridge off by hand and discard it.
4. On the new desiccant cartridge, lubricate the
sealing rings with silicone grease.
IMPORTANT: Only use the silicone grease sup-
plied with Bendix replacement kits.
5. Screw the desiccant cartridge onto the body, by
hand, until the seal makes contact with the body.
Rotate the cartridge clockwise about one full
turn. Firmly tighten the cartridge.
WABCO System Saver Air
Dryers
NOTE: The following instructions apply to the
System Saver 1200, 1200 Plus, and Twin air
dryers.
NOTICE
The WABCO System Saver air dryers can use ei-
ther a standard or oil coalescing desiccant car-
tridge. When replacing the desiccant cartridge, it
is very important to use the same type of car-
tridge that was originally installed on the dryer. Oil
coalescing cartridges can be used in any applica-
tion, but require more frequent service intervals
(every 1 to 2 years instead of every 2 to 3 years
for a standard cartridge). Do not replace an oil co-
alescing cartridge with a standard cartridge, as
this may result in contamination and malfunction-
ing of downstream air system components.
Refer to Fig. 4 for cartridge replacement.
1. Drain the air system.
2. Using a strap wrench, turn the desiccant car-
tridge counterclockwise and remove it.
3. Remove and discard the O-ring.
4. Clean the top surface of the dryer base with a
commercial cleaning solvent.
IMPORTANT: If the air dryer base is damaged,
preventing a tight seal, replace the air dryer.
5. Using a multipurpose, high-temperature grease
that resists water, steam, and alkali, lightly coat
the surfaces of the new O-ring and the dryer
base. Install the O-ring.
6. Thread the desiccant cartridge onto the dryer
base (turn clockwise). When the seal contacts
the base, tighten the cartridge one complete turn
more. Do not overtighten.
f421910 10/07/2016
1
2
3
1. Desiccant Cartridge
2. Cartridge Sealing Ring
3. Threaded Base Post
Fig. 3, Desiccant Cartridge Replacement
Brakes
42
Columbia Maintenance Manual, September 2015
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