Table 4-17. Water Closet Gravity Timer Malfunction Troubleshooting.

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Table 4-16. Water Closet Activation Valve Assembly Troubleshooting

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

Table 4-18. Water Closet Vacuum Dispensing Valve Troubleshooting

TM: 55-1905-220-14-8

4-5. GENERAL (Continued).

Table 4-17. Water Closet Gravity Timer Malfunction Troubleshooting.

NOTE

Refer to paragraph 4-15 for maintenance instructions.

MALFUNCTION -

TEST OR INSPECTION

CORRECTIVE ACTION . . .

1. Will not cock.

Step 1. No vacuum or low vacuum.

Disconnect line from top of timer and check for vacuum.

Step 2. Ruptured diaphragm.

Replace.

Step 3. Activation valve not assisting.

Troubleshoot activation valve assembly.

2. Will not honor low vacuum hold.

Step 1. Vacuum switch (N.O.) broken.

Replace.

Step 2. Vacuum switch (N.O.) out of position.

Adjust position of switch by loosening mounting screws.

3. Will not activate water dispensing valve or vacuum dispensing valve.

Step 1. Vacuum switch (N.C.) broken.

Replace.

Step 2. Vacuum switch (N.C.) is out of position.

Adjust position of switch by loosening mounting screws.

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