TM 5-4310-384-13
Table 4-1. Troubleshooting (Continued)
Malfunction
Test or Inspection
Corrective Action
Step 3.
If oil leakage occurs between crankcase cover and breather assembly cover, check felt oil separator on
breather assembly.
Replace oil separator (paragraph 4-7).
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
