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Air Dryer End Cover Removal Procedure
The Bendix
®
AD-2
®
air dryer cartridge contains a high
spring load. When replacing the AD-2 air dryer cartridge, or
performing any maintenance requiring end cover removal,
follow the procedure outlined below.
End Cover Removal
1. Loosen the three cap screws on the end cover and
turn the retaining clamps aside (cap screws may be
left fi nger tight).
2. Locate the notch in the air dryer shell. While pushing
the end cover up into the dryer, insert the blade of a
screwdriver in the notch and slowly pry out the retaining
ring. If the cartridge bolt has loosened, the cartridge
spring may exert a force on the end cover retaining
ring making removal of the retaining ring and end
cover diffi cult. This spring force will prohibit the end
cover moving up into the dryer shell when pushed up.
Warning: This same force can also cause the end
cover to come out of the air dryer shell unexpectedly
during the removal process. Exercise extreme caution
to prevent bodily injury.
3. Do not stand or lay directly under the end cover while
servicing. Ensure adequate clearance between the
end cover and other surfaces to prevent hand injury if
the end cover dislodges rapidly during removal. NOTE:
Be certain the desiccant sealing plate assembly comes
out with the cartridge.
Before attempting to remove the desiccant sealing plate,
measure the cartridge bolt from the top of the desiccant
plate lock nut to the end of the bolt threads. If that
measurement is approximately 3-3/16 inches, proceed
with the disassembly.
Figure 6 – Desiccant Sealing Plate
If the bolt measures approximately 1-9/16 inches,
disassemble using CAUTION. Approximately 75 pounds
of spring force will remain against the desiccant plate
when the lock nut reaches the end of the bolt thread and
is removed.
REMOVING AND REBUILDING THE AIR DRYER
DESICCANT SEALING PLATE
Before the desiccant cartridge can be replaced or
rebuilt, the desiccant sealing plate must be removed. It
is recommended that all non-metallic parts be replaced
when the plate is removed. In the past, three methods have
been employed to secure the desiccant sealing plate to the
desiccant cartridge: a TruArc
thin nuts; and the latest method – a single hex lock nut.
Removing the securing device will permit the desiccant
plate to be separated from the desiccant cartridge. After
removing the desiccant cartridge:
1. Remove the two o-rings from the desiccant plate and
discard them.
2. Remove the ball check valve retaining clip and remove
and discard the rubber ball valve.
3. Clean the desiccant plate thoroughly using a quality
commercial solvent, making sure the purge orifi ce and
check valve seat are clean.
4. Install a new ball check valve and replace the retaining
clip and screw. (See Figure 5.)
Figure 7 – Replacement Desiccant Cartridge
®
retaining ring; two special
7
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