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 TM 55-1905-223-24-18-1
Troubleshooting - CONT
Table 2-2.
Malfunction
Test or Inspection
Corrective Action
POTABLE WATER PIPING SYSTEM - CONT
Check that the pump operates in the direction indicated by the arrow on
a.
the pump casing.
Make sure the shaft rotation is clockwise when looking at
the motor end of the pump.
Check all electrical connections to motor.
b.
c. Check source voltage, phase, and frequency applied to motor as to
specifications listed on motor name plate/decal.
STEP 13. Pump speed too low.
a. Check motor input, make sure motor is receiving full voltage and
frequency.
b. Check voltage, phase, and frequency on motor with specifications on
motor nameplate.
STEP 14. Pump impeller clogged or damaged.
Repair/replace pump, para. 2-95.
STEP 15. Shaft seal assembly/impeller binding.
a. Check for freedom of rotation by momentarily starting the motor and
listening for rubbing sound.
b. If rubbing sound is detected:
Replace/repair pump, para. 2-95.
No discharge pressure.
214.
STEP 1. Check for closed discharge valve.
Ensure discharge valve is fully open.
STEP 2. Check for closed suction valve.
Ensure suction valve is fully open.
Check valve installed backwards or jammed.
STEP 3.
Ensure check valve is installed in correct direction with stem in the
a.
u p r i g h t position.
If valve is jammed, refer to Malfunction 216, Step 10.
b.
Check for pump casing vapor lock (cavitation).
STEP 4.
2-161
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