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 TM 55-1905-223-24-18-1
Troubleshooting - CONT
Table 2-2.
Malfunction
Test or Inspection
Corrective Action
VALVES AND STRAINERS - CONT
STEP 2. Check for worn gasket or preformed packing.
a. Replace gasket or packing.
b. Replace strainer.
(Refer to Index for procedures for particular strainer.)
POTABLE WATER PIPING SYSTEM
Low discharge pressure.
213.
Check for low liquid level in fresh water tank (air vortexing into
STEP 1.
suction).
Check valve alignment. Realign valve to access other tank
(TM 55-1905-223-10).
STEP 2. Check for partially closed suction valve.
Ensure suction valve is fully open.
STEP 3. Check for partially closed discharge valve.
Ensure discharge valve is fully open.
Check for sticking valves.
STEP 4.
NOTE
a.
The main cause of a sticking valve stem is overtight
packing.
To loosen the stem, slack up the gland.
Check that the gland is not binding the stem.
b.
I f this is the case, correct the position of the gland by adjusting the
c.
gland nuts.
Paint or other foreign matter on the valve stem can cause sticking.
d.
Remove paint or foreign matter by cleaning.
e.
f.
If the valve is jammed open or shut, release the jam by using the
handwheel.
If the valve jam cannot be released. Replace valve (para. 2-319).
g.
h.
If the valve stem is bent or the threads are burred/stripped.
Repair/Replace valve (para. 2-319).
STEP 5. C h e c k for leaking lines, fittings, or connections.
I n s p e c t all lines, tighten connections and fittings as necessary.
2-159
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