TM 9-2330-294-14
Table 4-4. Troubleshooting Air System Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
24. FAIL-SAFE RELEASE TANK DOES NOT REMAIN PRESSURIZED WHEN MAIN
AIR SYSTEM IS DRAINED
Step 1. Check for leakage in tank fittings or lines leading to fail-safe manual release valve.
Tighten fittings or replace defective components (para 4-39).
Step 2. If no leaks are found in step 1 above, check for defective one-way check valve (para 4-37n).
Replace valve (para 4-46).
S U S P E N S I O N AIR SYSTEM
25.
AIR SPRINGS AND AIR AXLE LIFTS FAIL TO INFLATE
Visually inspect air line between air tank and air control valve for dents or breaks.
Cautiously loosen fitting near air control valve and listen for escaping air. No escaping
air indicates plugged line.
Replace damaged or plugged air line (para 4-39).
26.
AIR SPRINGS OR AIR AXLE LIFTS FAIL TO INFLATE FULLY
Step 1. Check for defective or misadjusted pressure regulator valves (para 4-37i).
Adjust valve (para 4-37i ) or replace valve (para 4-49).
Step 2. Check for defective two-way check valve (para 4-37k ).
Replace valve (para 4-51).
27.
AIR SPRINGS FAIL TO INFLATE WHILE AIR AXLE LIFTS INFLATE PROPERLY
Step 1. Check for defective two-way check valve (para 4-37k).
Replace valve (para 4-51).
Step 2. Check for defective air control valve (para 4-37m).
Replace valve (para 4-48).
Step 3. Visually inspect for torn or damaged air spring.
Replace air springs (para 4-55)
28.
ONE SET OF AIR SPRINGS FAIL TO INFLATE
Visually inspect air line going to defective air spring for dents or breaks. Cautiously
loosen fitting at air spring with air control valve handle in "LIGHT LOAD" position and
listen for air escaping. No escaping air indicates plugged line.
Replace damaged or plugged air line (para 4-39).
29.
BOTH AIR AXLE LIFTS FAIL TO INFLATE
Step 1. Check for defective or misadjusted 100 psi regulator valve (para 4-37i).
Adjust valve (para 4-37i) or replace valve (para 4-49).
Step 2. Check for broken or loose lift rod.
Tighten or replace lift rod (para 4-54).
Step 3. Check for defective air control valve (para 4-37m).
Replace valve (para 4-48).
Step 4. Visually inspect for torn or damaged air axle lifts.
Replace air axle lifts (para 4-54).
30.
ONE AIR AXLE LIFT FAILS TO INFLATE
Step 1. Visually inspect air line going to defective air axle lift for dents or breaks. Cautiously
loosen fitting at air axle lift with air control valve handle in "NO LOAD (LIFT)" position
and listen for air escaping. No escaping air indicates plugged line.
Replace damaged or plugged air line (para 4-39).
Step 2. Visually inspect for torn or damaged air axle lift assembly.
Replace air axle lift assembly (para 4-54).
31.
AIR WILL NOT VENT WHEN AIR CONTROL VALVE HANDLE IS MOVED FROM
HIGH TO LOW PRESSURE POSITION
Check for defective air control valve (para 4-37m).
Replace valve (para 4-48).
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