TM 9-2320-260-20
Table 2-3. Compressed Air and Air-Hydraulic Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
Loosen outlet line at air compressor very slowly. Stop procedure
and tighten the moment air begins to escape. Injury to personnel
may result if line is accidently disconnected from a serviceable
operating compressor.
c. Carefully loosen outlet line from air compressor until air can be heard escaping.
If no air is heard escaping from air compressor, perform step 8.
Step 8. Check air compressor governor adjustment (para. 8-25).
If adjustment does not solve problem, replace governor (para. 8-25) and retest air
compressor. If air compressor is still not functioning, notifiy your supervisor.
END OF TESTING!
12. AIR PRESSURE RISES ABOVE NORMAL OPERATING PRESSURE
Step 1. Check air compressor governor adjustment (para. 8-25).
If adjustment does not solve problem, replace air compressor governor (para. 8-25).
Step 2. Check for defective unloading valve.
If air pressure rises above normal operating pressure, but valve does not open to release
pressure, notify your supervisor.
END OF TESTING!
13. AIR PRESSURE GAGE INDICATES LOW OR NO AIR PRESSURE
(LOW AIR PRESSURE WARNING BUZZER DOES NOT SOUND)
Step 1. Check for loose, restricted, and damaged air lines.
Tighten air lines if loose. Replace restricted or damaged air lines as necessary.
Step 2. Check for defective air gage.
Replace air gage if defective (para. 4-9).
END OF TESTING!
14. AIR PRESSURE GAGE INDICATES NORMAL OPERATING PRESSURE
(LOW AIR PRESSURE WARNING BUZZER DOES NOT SHUT OFF)
Check for defective low air pressure buzzer (table 2-4, electrical troubleshooting, malfunction 34).
Replace low air pressure buzzer if defective (para. 4-23).
END OF TESTING!
AIR-OPERATED ACCESSORIES
15. WINDSHIELD WIPERS INOPERATIVE OR OPERATE SLOWLY
(AIR GAGE AT NORMAL OPERATING PRESSURE)
Step 1. Start engine (TM 9-2320-260-10) and allow air pressure to build up to normal operating
pressure.
Step 2. Operate windshield wipers and inspect lines and hoses for leaks.
a. If air leaks are found, repair as required.
b. If not air leaks are found, perform test 1.
Test 1. Check windshield wiper motor supply line (1) pressure.
Step 1. Compress clamp (2) and disconnect windshield wiper motor supply line (1) from tee (9).
Step 2. Install adapter (3) on test gage (4).
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