TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
Loosen outlet line at air compressor very slowly. Stop procedure
and tighten fitting the moment air begins to escape. Injury to
personnel may result if line is accidentally disconnected from a
serviceable operating compressor.
Step
3. Carefully loosen fitting (2) until air is heard escaping.
a. If air is heard, tighten fitting and proceed to test 3.
b. If air is not present, notify DS maintenance of defective air compressor (1).
Test 3.
Inspect outlet line (3) for damage that could restrict airflow.
a. If damage is present, repair or replace outlet line (3) (TM 9-243).
b. If no damage is present, perform test 4.
Test 4.
Check outlet line for blockage.
Step
1. Stop engine and open all drainvalves (6), in sequence shown, until brake system air
pressure is vented.
Step
2. Close drainvalves (6).
Step
3. Disconnect outlet line (3) at wet supply tank (5) and install tee (4) between tank (5) and
outlet line (3).
Step
4. Connect test gauge to tee (4).
Step
5. Direct assistant to start engine and allow air system to build to normal operating
pressure.
Step
6. Compare test gauge reading with gauge readings on instrument panel.
a. If readings compare (below 80 psi (552 kPa)), perform test 5.
b. If test gauge reads normal operating pressure, test instrument panel gauges for
proper operation. Perform malfunctions 13 and 14.
c. Stop engine, drain air, remove test gauge, and connect outlet line (3).
Test 5.
Check air governor.
Step
1. Replace governor with one known to be good (para. 3-207).
Step
2. Start engine and allow air pressure to reach normal operating pressure.
a. If air pressure is normal, governor was defective.
b. If air pressure remains below 80 psi (552 kPa), air compressor (1) is defective.
Notify DS maintenance.
Step
3. Check primary air system relay valve; perform test 12.
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