BENDIX AD-2 Service Data - Page 7

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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