TM 5-4220-225-14
Table 4-1. Unit Troubleshooting Procedures (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
15.
LEAK AT EXHAUST VALVE.
Step 1.
Visually inspect the exhaust valve body preformed packing.
Replace preformed packing (para. 4-23 or 4-24).
Step 2.
Inspect valve mounting screws for proper installation.
Tighten or replace screws.
Step 3.
Visually inspect the diaphragm and retainer.
Replace the diaphragm if required (para. 4-23 or 4-24).
16.
LEAK BETWEEN THE BASE AND UPPER BREECH RING.
Step 1.
Visually inspect the base-to-breech ring preformed packing.
Replace the defective preformed packing (para. 4-18).
Step 2.
Inspect the breech ring mounting screws for tightness and damage.
Tighten and replace as necessary.
17.
LEAK BETWEEN SHELL AND BASE.
Step 1.
Inspect shell and base for signs of deterioration.
Deliver to advanced repair facility.
Step 2.
Inspect the shell-to-base screws and inserts for tightness and proper thread seal.
Tighten and reseal as necessary.
18.
RELIEF VALVE WILL NOT LIFT.
Step 1.
Substitute a new relief valve.
Replace relief valve and retest (para. 4-21).
Step 2.
Retest for relieving pressure.
Adjust to lift at 20 psig and retest (para. 2-8).
4-11
