ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
AIR SYSTEM AND BRAKES
60. AIR HORN DOES NOT WORK.
Safety goggles must be worn when working with air lines to prevent personal
Check AIR PRESSURE gage for air pressure between 90 and 130 psi. If specified
air pressure is not present, start engine and check that air pressure in air system is
between 90 and 130 psi (TM 5-3805-254-10). Shut down engine (TM 5-3805-254-10).
Check for air pressure at valve (1) as follows: Using 6-inch slip-joint pliers, take out cotter pin (2),
and pull chain (3). Using number one cross-tip screwdriver, unscrew and take out two screws (4),
and take off cover (5). Using 5/8inch open-end wrench, loosen input hose fitting (6) six turns.
Listen for air pressure hissing at input hose fitting (7).
a. If air pressure is not present at input hose fitting (7), go to step 2.
b. If air pressure is present at input hose fitting (7), tighten hose fitting (7) using 5/8-inch
open-end wrench, and go to step 3.