Table 4-20. Sewage System Sewage Discharge Valve Troubleshooting.

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Table 4-19. Water Closet Water Dispensing Valve Troubleshooting

TM-55-1905-220-14-8 Landing Craft Utility LCU 1671-1679 NSN 1905-01-009-1056 Manual

Table 4-21. Urinal Discharge Valve Troubleshooting.

TM 55-1905-220-14-8

4-5. GENERAL (Continued).

Table 4-20. Sewage System Sewage Discharge Valve

Troubleshooting.

NOTE

Refer to paragraph 4-15 for maintenance instructions.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. Discharge valve.

Step 1. No vacuum or low vacuum supply.

Check vacuum pressure gage at collection tank.

Step 2. Line loose or broken to bottom of valve.

Tighten or replace line.

Step 3. Blockage to outlet tube.

Clear line.

Step 4. Malfunction of gravity timer.

See Gravity Timer Troubleshooting guide.

Step 5. Ruptured diaphragm or fracture lower or upper body.

Replace valve.

4-65