TM 5-4310-385-13
Table 4-1. Troubleshooting (Continued)
Malfunction
Test or Inspection
Corrective Action
Step 4.
Check for leaking oil seal at the crankcase shaft.
Install new oil seal in crankcase (paragraph 4-7).
3. COMPRESSOR RUNS NOISY.
Step 1.
Check for foreign matter, such as carbon, metal chips, etc. or damaged components in cylinder
and crankcase.
Remove heads and clean cylinder; inspect crankcase (paragraph 4-7).
Step 2.
Check for worn or damaged connecting rod assemblies.
Replace damaged connecting rod components (paragraph 4-8).
Step 3.
Check for worn bearings.
Replace bearings as necessary (paragraph 4-9).
Step 4.
Check for worn or unbalanced crankshaft.
Replace crankshaft (paragraph 4-7).
Step 5.
Check for end play in crankshaft.
Remove crankcase cover gasket (shim, .005" or .010") until end play is reduced (paragraph 4-7).
Removing too many gaskets may cause crankshaft to bind.
ELECTRIC MOTOR
1. MOTOR WON'T RUN.
Step 1.
Test for open motor windings (paragraph 3-33).
Replace frame and stator assembly (paragraph 4-10).
Step 2.
Test for shorts between windings and motor frame (paragraph 3-33).
Replace frame and stator assembly (paragraph 4-10).
2. NOISY OPERATION OF MOTOR.
Step 1.
Rotate motor shaft by hand and check for rough spots or binding. If rotation is not smooth,
bearings are bad.
Replace bearings (paragraph 4-10).
4-2
