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Difficulty Probable Cause Remedy
Discharge pressure too high. Reduce pressure.
Water hammer. Install pulsation dampener.
Stroke length at partial setting. Some operating noise is characteristic of
lost motion pumps.
Noisy gearing,
knocking
Low grease level. Add or replace grease.
Pipe size too small. Increase size of piping - install pulsation
dampener.
Pipe runs too long. Install pulsation dampener in line.
Pulsation dampener inoperative or
flooded.
Refill with air or inert gas. Inspect and
replace diaphragm and recharge.
Piping noisy.
No surge chamber or dampener used. Install pulsation dampeners.
Pump overloaded. Check operating conditions against pump
design. Verify discharge pressure
High or low voltage. Check power source.
Motor overheats.
Loose wire. Trace and correct.
Incorrect motor wiring Verify and correct