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Insufficient Pressure1. Speed too slow (check voltage)2. Improper impeller adjustment3. Impeller loose4. Impeller plugged5. Wear rings worn6. Entrained air in pump7. Leaking column joints or bowl castings8. Wrong rotation
No Liquid Delivered1. Pump suction broken (water level below bell inlet)2. Suction valve closed3. Impeller plugged4. Strainer clogged5. Wrong rotation6. Shaft broken or unscrewed7. Impeller loose
Vibration1. Motor imbalance - electrical2. Motor bearings not properly seated3. Motor drive coupling out of balance4. Misalignment of pump, castings, discharge head, column or bowls5. Discharge head misaligned by improper mounting or pipe strain6. Bent shafting7. Worn pump bearings8. Clogged impeller or foreign material in pump9. Improper impeller adjustment10. Vortex problems in sump11.
Resonance - system frequency at or near pump speed Insufficient Capacity1. Speed too slow2. Improper impeller trim3. Impeller loose4. Impeller or bowl partially plugged5. Leaking joints6. Strainer partially clogged7. Suction valve throttled8. Low water level9. Wrong rotation Using
Too Much Power1. Speed too high2. Improper impeller adjustment3. Improper impeller trim
Most important is Make sure the pump has sufficient fluid in the sump or supply lines. Make sure all suction valves are fully open on barrel-type pumps. Do not run any pump without fluid
