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 TM 55-1905-220-14-8
4-5. GENERAL (Continued).
Table 4-16. Water Closet Activation Valve Assembly Troubleshooting. NOTE
Refer to paragraph 4-15 for maintenance instructions.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. No vacuum.
Step 1. No vacuum at supply side of valve.
Defective check valve. Replace.
Step 2. No supply vacuum.
Check gauge at collection tank, and operation of vacuum pumps.
2. Vacuum at inlet but not at outlets when valve is energized.
Vacuum switch not adjusted to make contact.
Loosen two mounting screws, position switch, and tighten screws.
3. Activation valve does not cycle.
Step 1. Valve physically broken.
Replace.
Step 2. Leaks in hoses.
Tighten or replace.
Step 3. Ruptured diaphragm in gravity timer assembly.
Replace.
4-61
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