42-03 Air Dryer Inspection - freightliner Argosy COE Maintenance Manual

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08/09/95
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
lbf·in (3060 to 4340 N·cm). Install the capscrew,
two washers, and a new Nylok nut in the upper
mounting bracket strap. Torque the upper mount-
ing bracket strap capscrew 80 to 120 lbf·in (904
to 1356 N·cm).
18. Connect and tighten the three air lines. Connect
the harness connector to the heater and thermo-
stat assembly until the lock tab snaps in place.
19. Start the engine, build the air pressure, and
check the air brake system for leaks. If any air
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9
4
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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
Fig. 1, AD-9 Air Dryer (exploded view)
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10
12
14
8
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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
leaks are present, see Group 42 of the Century
Class Trucks Workshop Manual for diagnosis
and repair information.
42–03 Air Dryer Inspection
1. Check for moisture in the air brake system by
opening the reservoir drain cocks. Examine the
discharge. Some trace of water in the discharge
is normal. A discharge of a milky gray liquid indi-
Century Class Trucks Maintenance Manual, April 2005
Brakes
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