5-38. AIR DRYER-Continued
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
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
(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.
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.
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