Knocking Noise Troubleshooting

Knocking Noise Troubleshooting

Cause/Solution

 Most Common:

 • Inadequate Water Supply
 • Worn Valves
 • Air in Water Line

  Inadequate Water Supply

Cause
Adequate water supply is essential for proper pump performance. A pump uses the incoming water to lubricate and cool its internal components and requires an adequate supply of water to fill the chambers. An inadequate water supply will result in a lower flow being discharged from the pump and can create a loud knocking noise.

Solution
Inspect the incoming line for obstructions; increase line size and/or increase supply line pressure.

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Worn Valves
 

Cause
Pump inlet and discharge valves control the flow in and through the pump. Worn valves can allow water to free flow in and out of a valve chamber and not be properly discharged from the pump. This condition can cause a loud knocking noise in the pump.

Solution
Remove each valve or set of valves and inspect for wear or debris. Clean or replace as necessary. 

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Air in Water Line
 

Cause
Air can enter the pump through any openings in the inlet plumbing to the pump. Entrapped air creates bubbles that may implode under pressure, causing caviatation and often loud pump “grinding” noises. Cavitation can wear internal pump components, resulting in possible pump failure.

Solution
Inspect the incoming line for obstructions; increase line size if possible; increase supply line pressure.

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