TM 5-4310-376-14
Table 4-2. Organizational Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
10. NO PRESSURE IN AIR RECEIVER TANK.
Step 1. Be sure that the drain cock and globe valve are closed. Check all fittings
and connections to air tank for leaks with engine running. Hissing or loud
noise will indicate air escaping.
Tighten connections or fittings.
Step 2. Loosen air inlet tube to unloading control valve. Listen for air escaping.
If air is heard, unloading control valve is defective; no air heard, compres-
sor pump defective.
Replace/repair defective component.
11. COMPRESSOR PUMP FAILS TO BUILD UP TO PRESSURE, PUMPS SLOWLY, OR
OVERHEATS.
Step 1. Check belt tension. Observe slack side of belts for a slight bow when
unit is operating.
Tighten belts if necessary.
Step 2. Check for leaks in air receiver system.
Step 3. Remove air cleaner and check for proper servicing. Check for foreign
material that may restrict air flow.
Instruct operator on air cleaner service procedures. Replace air
cleaner.
Step 4. Remove air head (para 4-22). Check for broken, carbonized or loose val-
ves or restricted air passages.
Remove valves from valve plate and clean both valve and seat by
brushing with a stiff bristle brush (not wire). If necessary, use
non- flammable safety solvent to loosen dirt, oil, or carbon de-
posits. Replace defective valves (para 4-22).
12. COMPRESSOR PUMP OR ENGINE NOISY OR VIBRATES EXCESSIVELY.
Step 1. Check pump and engine mounting bolts for tightness.
Tighten mounting bolts.
Step 2. Check engine drive pulley and compressor flywheel alignment.
Loosen mounting bolts, remove belts, and align pulleys. Reinstall
belts (para 4-14), and tighten mounting bolts.
4-22
