Running Rough Troubleshooting

Running Rough Troubleshooting

Cause/Solution

 Most Common:

 • Inlet Conditions
 • High Pressure Seals Worn
 • Debris in Valves

  Restricted Inlet Conditions

Cause
An adequate and smooth (non-turbulent) water supply to the pump is essential for best performance. Turbulent water entering the pump can cause the pump to run very rough.  Conditions that cause turbulent flow include plumbing restrictions such as pipe-reducers and elbows and any source of atmospheric air such as a leak in an inlet hose or a loose connection. Entrapped air can cause “bubbles” that can implode under pressure causing pump cavitation.

Solution
Inspect inlet line for loose fittings, cracked filters, fittings that need to be re-taped or any other restrictions in the inlet line. Use flexible hose if possible and use short-run plumbing to prevent restricted pump inlet flow.

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High Pressure Seals Worn
 

Cause
The high pressure seals in the pump keep water in the high pressure chamber.  When one high pressure seal wears sooner that the other two, an uneven flow results that can cause the pump to run very rough.

Solution
Inspect and replace high pressure seals as a complete set.

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Debris in Valves
 

Cause
Debris and contamination build-up on valve seat surfaces can disrupt the normal flow through the inlet and discharge valves. Debris in either of these valves can allow the water to free flow in and out of that valve chamber and not be properly discharged from the pump. This situation causes irregular flow patterns through the valve chambers, resulting in the pump “running rough.”

Solution
Remove each valve or valve stack and inspect. Clean or replace as required. Maintain proper system filtration.

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