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 TM 9-2320-285-24-1
2-48.
AIR COMPRESSOR TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
AIR COMPRESSOR KNOCKS
Remove cotter pin (para 2-52e) and check pulley nut for looseness.
a. If nut is loose, tighten (para 2-52e) and install new cotter pin (para 2-52e). Grasp pulley and
check for play on shaft; replace pulley (para 2-52e) if play is excessive.
b. If nut is tight, install new cotter pin (para 2-52e). Then notify direct support maintenance.
2-49.
TRAILER BRAKE LINES AND COUPLINGS TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
TRAILER BRAKES DO NOT RELEASE
Step 1.
Check if air system pressure is above 60 psi.
a. If air system pressure is below 60 psi, run engine at 1200 rpm to increase air system pressure.
b. If air supply is above 60 psi, go to step 2 below.
Step 2.
Check if tractor protection valve is fully depressed.
a. If tractor protection valve is not depressed, depress fully.
b. If tractor protection valve is fully depressed, go to step 3.
Step 3.
Check if trailer brake air lines are properly connected (emergency (red) hose to emergency
connection on trailer; service (blue) hose to service connection on trailer). Check trailer brake
lines and couplings for air leaks.
a. If air lines are not connected properly, reconnect (para 2-53a).
b. If lines and couplings are leaking air, repair or replace (para 2-53a).
c. If air lines are connected properly and lines and couplings are not leaking, go to step 4 below.
2-536
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