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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 5-1. Direct Support Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. LOW SUCTION PRESSURE - Continued.
Step 3. Plugged drier filter.
Replace drier filter (para 5-26).
9. COMPRESSOR NOISY.
Step 1. Slugging due to floodback of refrigerant.
See malfunction 6.
Step 2. Hydraulic knock due to excess oil in circulation.
a.
Remove excess compressor oil (para 5-46).
b.
Recheck oil level (para 5-46).
Step 3. Bearings wiped because of loss of oil.
a.
Add compressor oil (para 5-46).
b.
Recheck oil level (para 5-46).
c.
Check pipes for rattles and vibration (see malfunction 10).
Step 4. Compressor not firmly mounted.
Check for loose mounting hardware (para 5-46).
Step 5. Broken connecting rods or pistons.
a.
Check connecting rods pistons, and rings (para 5-49), replace if necessary.
b.
Check rods, pistons, and cylinder tolerances (para 5-49).
c.
If any cylinder bore is out of tolerance (para 5-49), replace compressor (para 5-46).
Step 6. Broken discharge or suction valves.
Check discharge and suction valves (para 5-33 and 5-34), replace if necessary.
10. PIPE RATTLE.
Inadequately supported piping or loose pipe connections.
Support pipes or check pipe connections.
11. OIL PRESSURE LOWER THAN NORMAL OR NO OIL PRESSURE.
Step 1. Low oil charge.
a.
Check compressor oil level (para 5-46).
b.
Add compressor oil and recheck compressor oil level (para 5-46).
Step 2. Faulty oil pump end bearing assembly.
Replace oil pump end bearing assembly (para 5-48).
5-5
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