TM 9-2320-260-20
Table 2-3. Compressed Air and Air-Hydraulic Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1. Check tire air pressure (TM 9-2320-260-10).
If tire air pressure is low, fill to proper level as required.
Step 2. Check for dragging brakes (malfunction 4 or 5).
END OF TESTING!
TRAILER BRAKES
10. TRAILER BRAKES DO NOT OPERATE (M818, M819)
Step 1. Start engine (TM 9-2320-260-10). Allow time for air pressure to build.
If pressure does not build, refer to malfunction 11.
Step 2. Check air lines for signs of leaks and restrictions.
Clean or replace air lines as required.
Step 3. Check trailer-to-trailer hoses for signs of leaking.
Tighten hose connection or replace as necessary
Step 4. Check hand control valve operation.
Replace hand control valve if defective (para. 8-23).
END OF TESTING!
COMPRESSED AIR SYSTEM
11. AIR PRESSURE DOES NOT BUILD TO NORMAL OPERATING PRESSURE
(LOW AIR PRESSURE BUZZER SOUNDS CONTINUOUSLY)
Step 1. Direct assistant to start engine (TM 9-2320-260-10).
NOTE
Refer to TM 9-2320-260-10 for location of auxiliary compressed air
system components.
Step 2. Check for open or leaking air reservoir drain valve.
Close drain valve if open. Tighten or replace if leaking continues.
Step 3. Check for open or leaking front and rear air couplings.
Close air couplings if open. Tighten or replace if leaking continues (para. 8-22).
Step 4. Check for open or leaking trailer air coupling shutoff valves.
Close shutoff valves if open. Tighten or replace if leaking continues (para. 8-26).
Step 5. Check for open or leaking auxiliary air supply valve.
Close air supply valve if open. Tighten or replace if leaking continues (para. 8-20).
Step 6. Check air lines for leaks or damage.
Tighten air line fittings if loose, or replace darnaged air lines as necessary.
Step 7. Check for defective air compressor governor with engine running.
a. Loosen and bleed air from air compressor governor to compressor air line.
b. Check compressor outlet line for heat (high pressure).
If outlet line is not warm to touch, continue testing.
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