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ME Pumps.
8.
Trouble shooting.
Symptom
Pump does not start
Little or no discharge and unit
will not prime.
Loss of suction after
satisfactory operation.
Possible cause(s)
Motor not connected
1. Casing not filled with water.
2. Total head too high.
3. Suction head higher than
pump designed for.
4. Impeller partially or
completely plugged.
5. Hole or leak in suction line.
6. Foot-valve too small.
7. Impeller damaged.
8. Foot-valve or suction line
not submerged deep enough
in water; pulling air.
9. Insufficient inlet pressure or
suction head.
10. Suction piping too small
11. Casing gasket leaking
12. Suction or discharge line
valves closed.
13. Piping is fouled or
damaged.
14. Clogged strainer or
foot valve.
1. Air leak in suction line.
2. When unit was last turned
off, water siphoned out of
pump casing.
3. Suction head higher than
pump designed for.
Possible solution(s)
Revise that motor connections
have been properly done.
1. Fill pump casing. Using a foot
valve will extend pump life and
facilitate immediate priming.
2. Shorten suction head.
3. Lower suction head, install
foot-valve and prime.
4. Disassemble pump and clean
out impeller.
5. Repair or replace suction line.
6. Match foot-valve to piping or
install one size larger foot-valve.
7. Disassemble pump and
replace impeller.
8. Submerge lower in water.
9. Increase inlet pressure by
adding more water to tank or in-
creasing back pressure by turning
gate valve on discharge line to
partially closed position.
10. Increase pipe size to pump
inlet size or larger.
11. Replace.
12. Open.
13. Clean or replace.
14. Clean or replace.
1. Repair or replace suction line.
2. Refill (reprime) pump casing
before restarting.
3. Lower suction head; install
foot-valve and primer.
21
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