Assembly

DISASSEMBLY

REBUILDING THE AD-1™AIR DRYER END COVER ASSEMBLY

To remove the end cover assembly from the air dryer follow steps 1-6 under the section of this manual entitled Removal of Desiccant Cartridge AD-1™and AD-2™air dryer. Before rebuilding the end cover, clean the exterior thoroughly using a quality commercial solvent.

1.Remove and discard the large o-ring 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.

NOTE: If during the serviceability checks it was determined that the heater and thermostat were defective, use the following procedure. It is not necessary to replace this assembly each time the purge valve is rebuilt.

FIGURE 14

9.Remove the two screws that secure the shield or thermostat retaining clip to the end cover.

10.Remove the shield or clip and the thermostat and inspect the bore for corrosion.

FIGURE 15-1

FIGURE 15-2

11.Remove the square cut seal ring at the bottom of the thermostat bore.

12.Remove the screw, retaining clip, o-ring, and the heater element. Inspect the bore for corrosion and if necessary, clean it.

13.Install the heater element, securing it in the end cover with the retainer clip and screw.

14.Install the square cut seal ring in the thermostat bore.