4-38. AIR COUPLING REPLACEMENT (Con't).
EMERGENCY and SERVICE air couplings are installed the same.
Antiseize tape should be applied at connection between elbow (3), ter-
minal bolt (8), and air coupling (9).
If removed, install elbow (3) to air line (1) and tighten nut (2).
Install air coupling (9) to terminal bolt (8).
EMERGENCY tag (7) is installed roadside: SERVICE tag (7) is installed
Position tag (7) at nose adapter (6). Install terminal bolt (8) and air coupling (9) assembly
through tag and hole in nose adapter.
Install starwasher (5) on terminal bolt (8). Loosely install nut (4).
Ensure that air coupling (9) is properly positioned when tight.
Hold elbow (3) and tighten terminal bolt (8) at elbow.
Hold terminal bolt (8) and tighten nut (4).
Connect tractor EMERGENCY and SERVICE air couplings to semitrailer (see paragraph 2-12).
Fully pressurize semitrailer air system (see TM 9-2320-273-10 or TM 9-2320-283-10).
Apply a soap solution to check for leaks at air coupling.
c. SEAL REPLACEMENT
Dummy coupling seal is replaced the same.
Remove seal (10) from air coupling (9).
Clean groove in air coupling (9) where seal (10) was removed.
Partially collapse replacement seal (10) with fingers. Insert one side of seal flange in groove
of air coupling (9).
Push seal (10) into place. Face of seal must lie flat, with no twist or bulge.