Service manual

ManualsBrandsBENDIX ManualsDryerAD-1 AIR DRYER

4. Remove the remaining six 3/8" cap screws (16), lock

nuts (19) and twelve special washers (17) that secure

the end cover to the housing (24). Separate the end cover

and desiccant cartridge (22) from the housing (24).

5. Remove the end cover to outer housing o-ring (23).

6. Do not remove the safety valve (12) from the end cover

unless it has been proven defective. If replacement is

required, apply thread sealant or Teflon

tape on the

threads of the replacement valve and torque to 120-400

in. Ibs.

7. Place a strap or chain wrench around the desiccant

cartridge (22) so that it is approximately 2-3 inches away

from the end cover. Rotate the cartridge counterclockwise

until it completely separates from the end cover. Note:

A substantial torque (up to 50 lb. ft.) may be required to

perform this disassembly.

8. Remove the desiccant cartridge o-ring (21) from the end

cover.

CLEANING & INSPECTION

1. Using mineral spirits or an equivalent solvent, clean and

thoroughly dry all metal parts.

2. Inspect the interior and exterior of all metal parts that

will be reused for severe corrosion, pitting and cracks.

Superficial corrosion and/or pitting on the exterior portion

of the upper and lower body halves is acceptable.

3. Inspect the bores of both the end cover and the purge

valve housing for deep scuffing or gouges.

4. Make certain that all purge valve housing and end cover

passages are open and free of obstructions.

5. Inspect the pipe threads in the end cover. Make certain

they are clean and free of thread sealant.

6. Inspect the purge valve housing bore and seats for

excessive wear and scuffing.

7. Inspect the purge valve piston seat for excessive wear.

8. Inspect all air line fittings for corrosion. Clean all old

thread sealant from the pipe threads.

9. All o-rings removed should be discarded and replaced

with new o-rings provided in appropriate kit(s).

Any component exhibiting a condition described in step 1

to 8 should be replaced.

ASSEMBLY

Prior to assembly, coat all o-rings, o-ring grooves, and bores

with a generous amount of the lubricant included in the

maintenance kit. Refer to Figure 7 during assembly unless

otherwise advised.

1. Purge Valve Housing Assembly

A. Install the quad-ring (14) in its groove on the O.D. of

the purge piston (10). Place the return spring (13) in

the bore of the purge valve housing. Insert the purge

piston (10) into the I.D. of the return spring. Place

the purge valve guide (2) onto the shoulder bolt (4)

followed by the purge valve (11). Using a ratchet or

wrench, screw the purge valve, purge valve guide and

shoulder bolt into the purge housing until it bottoms.

This will require a tool to hold the top of the purge

piston from rotating as the shoulder bolt is screwed

into the bottom of the purge piston to complete the

purge valve assembly (8). Torque the shoulder bolt

to 60-90 in. lbs.

B. Install the o-rings (5, 6 and 7) on the purge valve

housing placing each in its appropriate location. Note

o-ring (6) is not used on DLU models. If the exhaust

cover was removed during disassembly, install it on

the purge valve housing assembly (8) making certain

the “bubble” portion is positioned over the thermostat.

Install the assembled purge valve housing (8) in the

end cover making certain to orient both parts such

that the connector is approximately 10 degrees

clockwise from the supply port, while making certain

the purge valve housing is fully seated against the

end cover. Secure the purge valve housing to the

end cover using the three 1/4" self-tapping screws

(3). Start all three screws by hand then torque to 50-

80 in. Ibs.

2. Install the o-ring (1) on the check valve assembly (15),

then install the assembly in the end cover.

FIGURE 8 - END COVER TO HOUSING TORQUE PATTERN

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