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I have a centrifugal pumping machine that fails to pump up consistently. When powdered on, it spills up water, then stops and continues intermittently like that without a consistent flow of water out. What could be the cause? I just rewound it, and it works just fine. I suspected the capacitor, but not fully. Anyone who has more understanding should please tell me what's wrong. Thanks in advanceThis like the pumping machine

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    $\begingroup$ Is the supply of water restricted? $\endgroup$
    – Solar Mike
    Commented Feb 22, 2023 at 12:27
  • $\begingroup$ If it is fine after rewinding, the problem was probably with the winding or the brushes. $\endgroup$
    – AJN
    Commented Feb 22, 2023 at 12:47
  • $\begingroup$ @AJN could it be the capacitor because it uses a run capacitor? $\endgroup$
    – Apata John
    Commented Feb 22, 2023 at 13:56
  • $\begingroup$ Does the motor stop or does the water output stop ? $\endgroup$ Commented Feb 22, 2023 at 14:55
  • $\begingroup$ @blacksmith37 the motor doesn't stop but makes like hum hum hum sound. It seems like it on and off rapidly. I believe this causes the water to not flow out as normal but intermittently. $\endgroup$
    – Apata John
    Commented Feb 22, 2023 at 16:26

2 Answers 2

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Please also check the inlet (suction side) of the pump for leaks. If there is a vacuum leak in the inlet plumbing, it will suck air into the pump housing and cause the pumping action to stop.

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  • $\begingroup$ I don't think there is air leakage. Its air tight. $\endgroup$
    – Apata John
    Commented Feb 23, 2023 at 5:48
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You may have check the seals in housing, otherwise the pump is sucking air instead of water. Run thru a trial test in a tub/pool

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