14. Place the desiccant cartridge in a vise, and turn
the end cover clockwise an additional 180 to 225
degrees to fully tighten the desiccant cartridge to
the end cover.
NOTE: Desiccant cartridge torque should not
exceed 50 lbf·ft (68 N·m).
15. Place the housing over the desiccant cartridge
and align the mounting holes with the end cover.
IMPORTANT: Replace, do not reuse the Nylok
nuts on the air dryer cover.
16. Install the 6 capscrews, 12 washers, and 6 new
Nylok nuts. Tighten the capscrews in a star pat-
tern 270 to 385 lbf·in (3050 to 4350 N·cm). See
Fig. 2.
17. Install the air dryer on the lower mounting
bracket. Install the two previously marked cap-
screws, four washers, and two new Nylok nuts.
08/09/95
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1
2
3
4
5
9
10
11
12
13
14
15
17
18
19
21
22
23
24
25
10
10
10
10
10
10
6
7
8
8
8
20
16
1. 5/16" x 4-1/2" Upper Mounting
Bracket Capscrew
2. Upper Mounting Bracket Strap
3. 5/16" Lockwasher
4. 5/16" Nylok® Nut
5. Upper Mounting Bracket
6. Housing
7. Nylok® Nut
8. 3/8" Special Washer
9. Desiccant Cartridge
10. O-Ring
11. Safety Valve
12. Lower Mounting Bracket
13. 3/8" Capscrew (long)
14. Check Valve Assembly
15. Purge Valve Assembly
16. Purge Valve Bolt
17. Exhaust Diaphragm
18. Purge Valve
19. 1/4" Tapping Screw
20. Purge Valve Housing
21. Heater and Thermostat
Housing
22. Return Spring
23. Purge Piston
24. 3/8" Capscrew
25. End Cover
Fig. 1, AD-9 Air Dryer (exploded view)
Brakes42
Century Class Trucks Maintenance Manual, January 201642/2
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