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
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.
42–12 Versajust Slack Adjuster
Inspection and
Lubrication
IMPORTANT: Perform the
Brake Inspection
maintenance operation before lubricating the
slack adjusters.
1.
Visually check for physical damage, such as bro-
ken air lines and broken or missing parts.
2.
Using a quality multipurpose chassis lubricant,
NLGI Grade 2, lubricate the slack adjuster
through the grease fitting until clean lubricant
flows from the grease relief opening in the boot.
3.
Perform the "In Service Inspection."
In Service Inspection
1.
Apply and release the brakes several times while
observing the slack adjuster. The slack adjuster
and brake actuator should move freely, without
binding or interference, and should return to the
full released position. Observe the looseness that
exists between the clevis and adapter bushing
and the yoke and link pins and their mating parts
(clevis, body, link). Replace these parts if loose-
ness appears excessive. Make certain the brake
actuator pushrod jam nut is tightened securely.
2.
Inspect the slack adjuster for physical damage,
paying attention to the link, boot, and clevis. If
any components are damaged, repair or replace
them as necessary.
3.
Measure the brake actuator pushrod stroke while
making an 80 to 90 psi (552 to 621 kPa) brake
application. Actuator pushrod strokes should not
exceed the values shown in
and
. To achieve the correct pressure for this
test, build the system pressure up to a 100 psi
(690 kPa). Shut down the engine. Fan the
brakes to attain a 90 to 95 psi (621 to 655 kPa)
reading. Make and hold a full brake application
while the strokes are checked.
08/05/94
f421292
1
2
3
1.
Seal
2.
O-Ring
3.
Air Dryer Base
Fig. 11, Desiccant Cartridge Replacement
Brakes
42
122SD and Coronado 132 Maintenance Manual, February 2016
42/12
