BENDIX AD-2 AIR DRYER Manual - Página 11

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15. Install the thermostat metal side down in the end cover

bore and secure it in place using the retaining clip or

shield and the two screws.

16. Lubricate and install the o-rings on the plunger and cap

nut.

17. Lubricate the plunger bore and install the spring and

plunger (through the cap nut end).

18. Install the valve on the plunger, making certain the

chamfered end of the valve is in contact with the metal

seat of the body.

19. Using the screwdriver held in the vise, as described in

Steps 4 & 5, compress the plunger into the bore while

installing and tightening the nut.

20. Install the cap nut and tighten it.

21. Lubricate and install the large diameter o-ring around

the end cover assembly.

REBUILDING THE AD-2

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

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.

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 #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 cap screw, purge valve, purge valve piston

and the piston return spring.

7. Discard the piston o-ring, the purge valve, and the piston

return spring.

8. Wash all remaining parts in a commercial solvent, making

sure all surfaces, bores, ports, and passages are clean

and dry before assembly.

™

AIR DRYER END

™

and AD-2

™

Air Dryer. Before

NOTE: If during the serviceability checks it was determined

that the thermostat was defective, use the following

procedure. It is not necessary to replace this unit

each time the end cover is rebuilt. Use thermostat

kit. (See Figure 17)

9. Remove nut(2), then lockwasher(3), plain washer(4) and

o-ring(5). Discard o-ring and retain other parts.

10. Remove and retain four Phillips head screws(7) and

cover(6).

11. Remove and discard gasket(10).

12. Remove and retain spacer(11).

13. Cut uninsulated thermostat wire at Point B. (Figure 17),

remove and discard thermostat and terminal

assembly(1).

14. Clean remaining wire attached to heater terminal.

15. Clean thermostat "pocket" in end cover(9).

ASSEMBLY

16. Cut uninsulated lead of new thermostat(1) at Point A

(Figure 17).

17. Install thermostat in end cover "pocket" and position

uninsulated leads next to each other.

18. Using a soldering heat sink, clamp uninsula-leads at

Point B and solder leads with straight rosin core solder.

DO NOT USE ACID CORE SOLDER. Clean excess

solder off end cover.

19. Install thermostat terminal(1) in cover(6).

20. Install o-ring(5), washer(4), lockwasher(3) and nut(2).

Torque nut to 20-30 inch pounds.

21. Install spacer(11) over thermostat(1).

22. Install gasket(7) and cover(6) and secure cover to end

cover(9) using screws(7) and lockwashers(8).

23. Torque to 30-40 inch pounds.

24. Test thermostat as follows:

A. At a temperature above 85°F . check resistance

between thermostat terminal(1) and end cover(9).

Resistance should be 200,000 ohms or greater; if

not, check for solder "path" short.

B. Chill entire end cover assembly to 35°F . or below

and check resistance again. Resistance should be

2-15 ohms.

25. Lubricate the piston o-ring and install it on the piston.

26. Lubricate the piston bore.

27. Install the purge piston return spring and piston.

28. Install the purge valve in the large cap nut so that the

rubber portion rests on the metal seat of the cap nut.

29. Secure the valve to the piston using the 1/4"-20 cap

screw and lockwasher and torque to 50 inch pounds.

30. Lubricate and install the two cap nut o-rings.