TM 5-4310-349-14
Table 5-1. Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 8. Intercooler leaks.
Replace defective intercooler.
9. COMPRESSOR NOISY.
Step 1. Flywheel loom
Tighten nut on flywheel bolt.
10. COMPRESSOR VIBRATES EXCESSIVELY.
Step 1. Mounting insecure
Tighten mounting bolts.
Step 2. Drive pulley out of line.
Inspect and adjust alinement of drive pulley.
Step 3. Foundation insecure.
Strengthen foundation or relocate air compressor on solid base.
11. COMPRESSOR FAILS TO SHUT DOWN.
Step 1. Pressure switch not properly adjusted
Adjust pressure switch (para 5-8).
Step 2. Load requirement excessive for air compressor capacity.
Replace check valve assembly (para 3-10).
12. BELTS WEAR EXCESSIVELY.
Step 1. Flywheel loosed
Tighten nut on flywheel bolt.
Step 2. V-belts improperly adjusted.
Adjust V-belts (para 3-7).
Step 3. Oil or grease on belts.
Clean belts or replace damaged belts (para 3-7).
Step 4. Flywheel and pulley misaligned.
Align flywheel and pulley to eliminate side pull on V-belts.
13. SAFETY RELIEF VALVE BLOWS AT TOO LOW PRESSURE.
Step :1. Valve not properly seated.
Drain air and valve will reseat.
Step 2. Valve defective.
Replace valve.
14. MAGNETIC STARTER SWITCH FAILS TO OPERATE.
Step 1. Magnetic starter switch defective.
Replace or repair starter switch (para 5-7).
Step 2. Thermal relay heater defective.
Install a new thermal relay heater.
Section III. REPAIR AND OVERHAUL INSTRUCTIONS
AIR COMPRESSOR ASSEMBLY AND ELECTRIC MOTOR
Table 5-2. Compressor Repair And Replacement Standards
Desired clearance
Maximum allowable wear and
Manufacturer's
dimensions and
clearance
tolerances in inches
Min.
Max.
Min.
Max.
Cylinders
Bore, low - pressure -
4.6245
4.6255
.................................................................0...0.0.4.......................
. ...
Bore, high - pressure -
64995
2.5005
.................................................................0...0.0.2.......................
. ...
Out-of-round -
...................................
..........................
.................................................................0...0.0.1.......................
. ...
Taper .......................
0.001
Crankshaft
Journal (rod) size -
1.628
1.6265
Taper........................
.....................................
..........................
.................................................................0...0.0.1.......................
. ...
5-3
