SERVICE MANUAL
REBUILDING AD-1 END COVER ASSEMBLY
To remove the end cover assembly from the air
dryer, follow Steps 1 through 6 under "Removal of
Desiccant Cartridge AD-1 & AD-2." Before rebuilding the
end cover, clean the exterior thoroughly using a quality
commercial solvent.
Disassembly
1.
Remove and discard the large O-rings around
the end cover.
2.
Remove the exhaust elbow and clamp.
3.
Remove the cap nut and discard the cap nut O-
ring.
4.
Place the handle of a large screwdriver in a vise
and secure it.
5.
Place the slot in the plunger (cap nut end) over
the blade of the screwdriver, hold it securely and
remove the nut from the plunger using a 1/2"
socket wrench.
6.
Remove the plunger, spring and valve; discard
the valve.
7.
Clean and inspect the plunger bore and the
valve seat.
8.
Remove and discard the three O-rings from the
plunger, clean the plunger.
If during the serviceability checks
it
was
determined that the heater and thermostat were
defective, replace end cover as an assembly.
Reassembly
1.
Using Item 1 of LUBRICATION SPECIFICA-
TIONS, lubricate and install O-rings on the
plunger and cap nut.
2.
Lubricate the plunger bore and install the spring
and plunger (through the cap nut end).
3.
Install the valve on the plunger making certain
the chamfered end of the valve is in contact with
the metal seat of the body.
4.
Using the screwdriver held in the vise, as
described in Steps 4 and 5, compress the
plunger into the bore while installing and
tightening the nut.
5.
Install the cap nut and tighten it.
6.
Lubricate and install the large diameter O-ring
around the end cover assembly with Item 1 of
LUBRICANT SPECIFICATIONS.
REBUILDING AD-2 END COVER ASSEMBLY
To remove the end cover assembly from the air
dryer, follow Steps 1 through 6 under "Removal of
Desiccant Cartridge AD-1 & AD-2." Before rebuilding the
end cover, clean the exterior thoroughly using a quality
commercial solvent.
Disassembly
1.
Remove and discard the large O-ring around the
end cover assembly.
Fig. 17 AD-2 End Cover Assembly
2.
Remove the single 6-32 screw securing the
exhaust diaphragm and separate the diaphragm,
washer and screw. Discard the diaphragm.
3.
Remove the three No. 6-32 screws securing the
exhaust cover and remove the exhaust cover.
4.
Remove the purge valve assembly, the large hex
cap nut from the end cover and discard both O-
rings around the cap nut.
5.
Using a 7/16" socket wrench and a large
screwdriver, remove the 1/4"-20 hex head cap
screw which holds the assembly together.
6.
Separate capscrew, purge valve, purge valve
piston and the piston return spring.
7.
Discard the piston O-ring, the purge valve and
the piston return spring.
CTS-4079 - CHAPTER XIV - Page 10
