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Water Pump Humming, Rotor Stuck, Not Pumping Water—What Could Be the Issue?

cierni 76170 16
Best answers

Why does a single-phase dirty-water pump hum and not start pumping when the rotor is stuck?

Most likely the start capacitor is faulty, and if replacing it does not fix the problem, the rotor or inlet-side bearing is seized or rusted. Several replies say to remove the white cylinder capacitor and replace it with a new one; if the capacitor is accessible, that is a simple fix, and if not, the pump may need replacement [#11019271][#11019351][#11019398][#13163057] Another reply notes that if the capacitor is OK but the pump only hums, starts only when the impeller is nudged, or then stops again, the bearing on the water-inlet side may be damaged or rusted and the pump needs disassembly to check it [#21086975] If the rotor still does not turn after a known-good capacitor, a winding or connection fault is also possible, but the main suspects in the thread are the capacitor and a stuck bearing/rotor [#19437176][#19438250]
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  • #1 11019240
    cierni
    Level 2  
    Posts: 3
    Rate: 18
    Board Language: polish
    Hello!

    When I connect electricity to a water pump (dirty water), it makes a strange noise (humming) and does not pump water. It is not possible to turn the rotor, and when I disconnect the current, the rotor turns slightly. I am asking for help because I need a pump.

    Regards.
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  • #2 11019271
    electro_Nick
    Level 33  
    Posts: 1721
    Help: 218
    Rate: 203
    Board Language: polish
    Single phase pump? Probably a capacitor.
  • #3 11019323
    cierni
    Level 2  
    Posts: 3
    Rate: 18
    Board Language: polish
    Can I fix it or do I need to buy a new pump?
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  • #4 11019351
    electro_Nick
    Level 33  
    Posts: 1721
    Help: 218
    Rate: 203
    Board Language: polish
    If you can get to the capacitor, yes. If not, new.
  • #5 11019398
    KuReK93
    Level 17  
    Posts: 326
    Help: 14
    Rate: 121
    Board Language: polish
    Could you provide any more details or a photo of this pump? Most likely, the starting capacitor shot, i.e. a simple replacement (disconnect the old one and connect a new one - two cables). And the rotor should move, it's a bit risky because you connect the pump to the network and with some thick nail or a screwdriver you push the rotor hard for sure (I did it at home - stupid fun) but you can try ... at your own risk ;)
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  • #6 11019509
    cierni
    Level 2  
    Posts: 3
    Rate: 18
    Board Language: polish
    Water Pump Humming, Rotor Stuck, Not Pumping Water—What Could Be the Issue? Water Pump Humming, Rotor Stuck, Not Pumping Water—What Could Be the Issue?
  • #7 11019570
    electro_Nick
    Level 33  
    Posts: 1721
    Help: 218
    Rate: 203
    Board Language: polish
    And here you have that white cylinder - unplug it and go to the store with it.
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  • #8 13160339
    Andczech
    Level 2  
    Posts: 4
    Rate: 10
    Board Language: polish
    Hello, sorry that I dig up the old topic, but I have a question for me, the pump is identical, the pump only hums when I turn the impeller on the pump, it starts to work, but it turns very slowly and then the pump turns off, what can it be caused by a capacitor or maybe something else?
  • #9 13163057
    marymietek
    Level 10  
    Posts: 9
    Rate: 11
    Board Language: polish
    You need to replace this capacitor. I did too. I bought a new one (probably PLN 5) and the pump is pumping.
  • #11 19315692
    wiesiekmisiek
    Level 33  
    Posts: 1588
    Help: 259
    Rate: 521
    Board Language: polish
    Eg locked motor rotor.
  • #12 19437088
    irekok
    Level 11  
    Posts: 11
    Rate: 45
    Board Language: polish
    I have the same. Replacing the capacitor did not help. The rotor just needs to be moved slightly and it spins. Does anyone have a solution for this?
  • #13 19437176
    klamocik
    Level 36  
    Posts: 3032
    Help: 332
    Rate: 714
    Board Language: polish
    irekok check because sometimes new does not mean working, break in connections or in the winding.
  • #14 19437491
    wiesiekmisiek
    Level 33  
    Posts: 1588
    Help: 259
    Rate: 521
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    Exactly . I sent back 3 capacitors because they were supposed to be new and they had 2 mF each. Perhaps the sleeves in the pump are already made. But measure this new capacitor.
  • #15 19438250
    beam_beer
    Level 23  
    Posts: 549
    Help: 49
    Rate: 135
    Board Language: polish
    The winding may also be turned on, and then you have to buy a new one. Rewinding is unprofitable.
    This can usually be seen with the naked eye.
  • #16 19527962
    annabrz12
    Level 1  
    Posts: 1
    Rate: 13
    Board Language: polish
    Hello, I have a problem, namely the pump, the grinder runs louder and pumps in short bursts, what could be the reason? It is 6 months old, the knives go loose after unscrewing the revision lid.
  • #17 21086975
    pawelostrejkoorzeszk
    Level 1  
    Posts: 1
    Rate: 1
    Board Language: polish

    Gentlemen, if the capacitor is ok and the pump buzzes and does not turn or only turns strongly, the bearing on the water inlet side is damaged (probably rusted). You have to take it apart a bit and bake the bearing isolating the impeller from the front of the housing. At my place it was running one day and standing the next. I replaced the capacitor and the lime buzzes and stands. I took the coils apart whole so I am looking. The bearing was clearly stagnant.
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Topic summary

✨ The discussion revolves around a malfunctioning water pump that produces a humming noise without pumping water. Users suggest that the issue may be related to a faulty starting capacitor, which is a common problem in single-phase pumps. If the capacitor can be accessed, it can be replaced easily; otherwise, a new pump may be necessary. Some users mention that the rotor may be locked or that bearings could be damaged, which can also prevent the pump from functioning. Additional troubleshooting steps include checking for connection breaks and ensuring the capacitor is functioning correctly. Users share experiences of similar issues and solutions, emphasizing the importance of inspecting the pump's internal components.
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