TM 5-4220-225-14
Table 4-1. Unit Troubleshooting Procedures (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. REDUCED AIR FLOW (Cont)
Step 10. Supply valve loose on stem.
Tighten handle set screws.
Step 11. Listen or feel for air leaking from connections. Check the tightness of connectors.
Tighten the hose connector snugly.
Step 12. Check for loose hose clamps.
Tighten hose clamps.
9. UNABLE TO INCREASE THE AIR FLOW.
Step 1. Remove the supply valve handle and inspect the packing gland nut for proper tightness.
Tighten the packing gland nut snugly.
Step 2. Remove the supply valve handle and stem assembly. Inspect for foreign matter and valve
stem damage.
Clean and reassemble the valve. Replace the valve or damaged stem
(para. 4-21).
10. EXCESSIVE OR UNCONTROLLABLE FLOW.
Step 1. Inspect the supply tubing connections for improperly installed or defective tail-piece
preformed packing. Check for improperly tightened tail-piece nuts and connectors.
a. Correctly reinstall the preformed packing. Replace if damaged (para. 4-20).
b. Perform leak check of the supply tubing assembly (para. 2-8).
Step 2. Check for loose packing gland nut or stripped threads.
Remove the supply valve handle and tighten the packing gland nut snugly.
Check to ensure air flow can be reduced. Replace if necessary (para. 4-21).
4-8
