Table 4-2. Troubleshooting continued
Test or Inspection
9. SLOW PUMPING OR INSUFFICIENT PRESSURE.
Step 1. Check for leaks in air lines and fittings.
Tighten fittings or replace leaking parts.
Reduce air use to less than 15 cfm.
Step 3. Check for wrong adjustment of pressure switch.
Adjust pressure switch to cut in at 160 psi and to cut out at 180 psi (para 4-22).
Replace bad valves.
10. COMPRESSOR OVERHEATS.
Step 1. Check if pump is low on oil.
Add oil to bring level up to full mark on oil gage.
Step 2. Check for dirt in intercooler or cylinder fins.
Step 3. Compressor is getting poor ventilation.
Step 4. Check for leaky manifold gaskets.
Replace gaskets (para 4-35 and 4-36) if defective.
Step 5. Check for worn valves.
Step 6. Check if pump is running backwards (clockwise as you face the flywheel).