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SYMPTOM
Little or no discharge and
unit will not prime
Loss of suction after
satisfactory operation.
Pump overloads driver
Pump vibrates and/or
makes excessive noise
Pumps runs but no fluid.
Pumps leaks at shaft
TROUBLE SHOOTING CHART
POSSIBLE CAUSE(S)
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.
15. Incorrect engine speed.
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.
4. Insufficient inlet pressure or suction head.
5. Clogged foot-valve, strainer, or pump.
6. Defective wearplate(s).
1. Total head lower than pump rating, unit
delivering too much water.
2. Specific gravity and viscosity of liquid being
pumped different than the pump rating.
3. Speed to high.
1. Mounting plate or foundation not rigid enough.
2. Foreign material in pump causing unbalance.
3. Impeller bent.
4. Cavitation present.
5. Piping not supported to relieve any strain on
pump assembly.
1. Faulty suction piping (air leak).
2. Pump located too far from fluid source.
3. Gate valve closed.
4. Clogged strainer.
5. Fouled foot-valve.
6. Discharge height too great.
7. Fouled impeller.
8. Faulty mechanical seal
1. Worn mechanical seal.
2. Replacement seal not installed properly.
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 increasing back pressure by turning
gate valve on discharge line 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.
15. Increase speed.
1. Repair or replace suction line.
2. Refill (reprime) pump casing before restarting.
3. Lower suction head, install foot-valve and
primer.
4. Increase inlet pressure by adding more water to
tank or increasing back pressure by turning
gate valve on discharge line to partially closed
position.
5. Unclog, clear or replace as necessary.
6. Replace.
1. Increase back pressure on pump by turning
gate valve on discharge line to partially closed
position that will not overload engine.
2. Consult factory.
3. Check and correct, lower speed.
1. Reinforce.
2. Disassemble pump and remove.
3. Replace impeller.
4. Check suction line for proper size and check
valve in suction line if completely open,
remove any sharp bends before pump and
shorten suction line.
5. Make necessary adjustments.
1. Replace
2. Replace
3. Open
4. Clean or replace
5. Clean or replace
6. Lower the height
7. Clean or replace.
8. Replace
1. Replace
2. Follow Maintenance instructions carefully.
11
CORRECTIVE ACTION
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