Fluid Power Journal

Noisy Pump Causing Foam to Escape Through the Filler Breather

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training

I was called to troubleshoot a foaming problem on a system that had the pump-motor unit mounted on top of the tank. When I got there, I was surprised that a root beer-like foam indeed was oozing from the filler breather cap and the pump was very noisy. Closer inspection showed that the foaming was worse when the pump was unloaded back to tank. I felt the pump noise was caused from the foaming problem, and the pump shaft seal showed a slight leaking problem when the unit was turned off.

Any idea what’s the cause of the problem?

If you have any questions about the details, please contact Robert Sheaf at rjsheaf@cfc-solar.com.

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