Disassembly -706880880

TM 5-4210-233-14&P-1

5-38. AIR DRYER-Continued

b. Disassembly.

NOTE

The following disassembly and assembly procedure is presented

for reference purposes and presupposes that a major rebuild of

the air dryer is being undertaken. Several replacement parts

and maintenance kits are available which do not require full

disassembly.

CAUTION

While performing service on the air dryer, it is not recommended

that a clamping device (vise, C-clamp, etc.) be used to hold any

die cast aluminum component as damage may result. To hold

the end cover, install a pipe nipple in the supply port and clamp

the nipple into a vise.

(1) Remove the check valve assembly (7) and O-ring (8). Remove the O-ring from the check valve

assembly.

(2) Remove the three self-tapping screws (9) that secure the purge valve housing assembly (31) to the

end cover assembly (13). Pull the purge valve housing assembly out of the end cover assembly.

Remove the three O-rings (10, 11 and 12) from the exterior of the purge valve housing assembly.

NOTE

O-rings (10 and 11) may be lodged in the end cover bores. If

so, they must be removed.

(3) Purge valve housing assembly disassembly.

NOTE

Exhaust cover (13) should be left intact while servicing the

purge valve housing assembly. To remove the piston (12) from

the purge valve housing assembly (31) requires twelve point

1/4" socket to hold the head of the purge valve bolt (14).

(a) Remove the nut (15) from the bottom of the purge valve housing assembly using a Torx head

socket to hold the head to the bolt. Remove the diaphragm washer (16), and the diaphragm (17),

and the purge valve (18) from the purge valve housing (31).

(b) Remove the Torx head bolt (14) from the opposite end, then the purge piston (19), the return spring

(36) and the two O-rings (20 and 21); one on the outside diameter and the other in the inside of the

purge piston.

5-210