TM 10-4610-232-12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
A chemical pump runs but discharge pressure/flow is low.
Step 1. Check strainer in chemical tank.
NOTE
If the strainers in the polyelectrolyte tank or the sequestrant tank are coated with a
whitish, stringy plastic like substance, notify the operators that they have put chemi-
cals in the wrong tanks, as this type of deposit only occurs when polyelectrolyte and
sequestrant are mixed together.
(a) Clean if dirty.
(b) Replace if plugged solid (para. 4-40 or 4-55).
(c) If the strainer is plugged, as noted above, make sure the level switch in the tank is not sticking.
Replace it if necessary (para. 4-55).
Step 2. Check suction lines to pump.
(a) If loose, tighten.
(b) If lines are plugged, replace (para. 4-26).
Step 3. Check discharge lines from the pump to the injection point.
(a) If the lines are plugged, replace (para. 4-26).
(b) If the discharge injector is plugged, replace (para. 4-26).
(c) If the check balls and seats in the injector are dirty, clean in soap water. Replace the check balls
and seats, if necessary (para. 4-26).
Step 4. Check the check bails and seats in the chemical pump discharge and suction ports (para. 4-36).
(a) Clean in soap water.
(b) If deposits will not wash off, replace the check balls and seats (para. 4-36).
Step 5. Refer to chemical pump electrical troubleshooting, malfunction 1, and start at step 6.
Step 6. Remove the priming valve from the chemical pump discharge port and operate the pump.
If the pump works satisfactorily, replace the priming valve (para. 4-36).
Step 7. Check the chemical pump diaphragm and head.
(a) Replace the diaphragm if it is punctured or torn (para. 4-34).
(b) Replace the pump head if cracked or damaged (para. 4-36).
(c) If the above checks have not isolated the problem, replace the pump (para. 4-36).
WASTE RELIEF AND PRODUCT RELIEF VALVE.
Waste relief valve leaks.
Check amount of leak.
(a) If leak is minimal, adjust valve by loosening the lock handle and turning adjustment handle slightly
clockwise to stop leak. Tighten the lock handle.
(b) If leak is major and there is no restriction in the waste out hoses, notify direct support mainte-
nance to replace valve.
4-25
CHEMICAL PUMPS.
