TM9-2330-372-14&P
4-26. REPLACE AIR RESERVOIR (Fig. 9).
a. Set parking brakes and block trailer wheels.
b. Disconnect air hoses from towing vehicle (if attached).
WARNING
Wear protective goggles when opening drain cock and avoid air blast or eye injury may occur.
c. Open drain cock (2) on reservoir (1) and bleed air system.
d. Using a 13/16-inch open-end wrench, disconnect hose from reservoir.
e. Remove two 9/16-inch hex head cap screws (4) and self-locking nuts (3) attaching each end of reservoir to trailer
frame and remove reservoir.
f. Replace drain cock (2) with 5/8-inch open-end wrench if damaged.
g. Mount replacement reservoir and secure with four screws (4) and selflocking nuts (3).
h. Screw hose from emergency relay valve to reservoir fitting.
i. Test air system (para. 4-22d).
4-27. REPLACE EMERGENCY RELAY VALVE (Fig. 11).
a. Set parking brakes and block trailer wheels.
b. Disconnect air hoses from towing vehicle.
WARNING
Wear protective goggles when opening drain cock and avoid air blast or eye injury may occur.
c. Open drain cock on reservoir and bleed air system.
d. Tag and disconnect service and emergency hoses at elbows (4), hose to reservoir at elbow (5) and four hoses (2
and 3) to air chambers by unscrewing hose fittings at valve.
e. Remove three 9/16-inch hex head cap screws (10) and self-locking nuts (9) holding valve assembly (1) and
adapter (6) to trailer frame and remove valve.
f. Install valve (1) and adapter (6) on frame and secure with three cap screws (10) and nuts (9).
g. Connect hoses disconnected in step c.
4-22
