5-38. AIR DRYER-Continued
Do not attempt to remove the heater and thermostat assembly,
as it will be damaged during the removal process and is NOT
AVAILABLE AS A SERVICE PART. If the heater and
thermostat are defective, replace the entire purge valve housing
assembly (31) which includes these items.
(4) Remove the remaining six cap screws (22), lock nuts (23) and twelve special washers (24) that secure
the end cover (32) to the housing (25). Separate the end cover (32) and desiccant cartridge (26) from
the housing (25).
(5) Remove the end cover to outer housing O-ring (27).
(6) Do not remove the safety valve (28) from the end cover unless it has been proven defective. If
ment is required, apply pipe sealant (Item 2, Appendix E) on the threads of the replacement valve and
torque to 120-400 in lbs (14-45 Nm), making sure the drain hole (slot) is facing down.
(7) Place a strap or chain wrench around the desiccant cartridge (26) so that it is approximately 2-3 inches
(51-76 mm) away from the end cover. Rotate the cartridge counterclockwise until it completely
separates from the end cover.
A substantial torque (up to 50 lb ft (68 Nm)) may be required to
perform this disassembly.
(8) Remove the desiccant cartridge O-ring (29) from the end cover.
Cleaning and Inspection.
Dry cleaning solvent P-D-680 is potentially dangerous.
Avoid repeated and prolonged breathing of vapors and skin
contact with the liquid. Do not use near open flame, arcing
equipment of other ignition sources. Always wear eye
protection and protective clothing. The flash point of P-D-
680 is 100 to 138 deg. F (38 to 50 deg. C).
Death or serious injury could occur if compressed air is
directed against the skin. Do not use compressed air for
cleaning or drying unless the pressure is/has been reduced
to 30 psi (2.11 kg/cm2) or less. When working with
compressed air, always use chip guards, eye protection, and
other personal protective equipment.
Using dry cleaning solvent (Item 3, Appendix E), clean and dry all metal parts with compressed air.