TM 10-4320-317-13
Table 4-6. Troubleshooting Procedures - (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
STORAGE TANK IS NOT BEING FILLED.
Step 1. Check to see if end cap is on last hoseline segment.
Install end cap (para. 2-8.d.).
Step 2. Check to see if gate valve is damaged.
Replace gate valve (para. 2-8.j.).
Step 3. Check to see if pressure-reducing valve is damaged.
Replace pressure-reducing valve (para. 2-8.g.).
4. PRESSURE-REDUCING VALVE WON'T OPEN OR WON'T CLOSE DRIP-TIGHT.
Step 1.
Pressurize valve and close cocks to pressure-reducing control. Loosen fitting on valve cover.
Check to see if water continues to flow.
If water continues to flow through opening, go to step Step 3. If water does not continue to flow
through opening, go to step Step 2.
Step 2.
Remove cover plug. Install threaded end of T-shaped bar in threade hole in top of valve stem.
d
Use bar to move diaphragm assembly up and down. Check to see if diaphragm assembly moves
freely.
If diaphragm assembly moves freely, go to step Step 4. If diaphragm assembly does not move freely,
notify direct support maintenance.
Step 3.
Check to see if diaphragm assembly is loose on valve stem.
If loose, tighten diaphragm assembly. If not loose, replace diaphragm.
Step 4.
Connect a line from the inlet to cover. Apply pressure to the valve inlet. Set pressure to 10 psi (69
kPa). Check to see if valve seal is drip-tight.
Notify direct support maintenance.
5.
20,000-GALLON PILLOW TANK IS NOT BEING FILLED.
Step 1.
Check to see if pressure-reducing valve assembly is damaged.
Refer to paragraph 2-8.g. and replace pressure-reducing valve assembly.
Step 2.
Troubleshoot 20,000-gallon pillow tank. Refer to applicable technical manual.
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