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My sta-rite pump makes a humming noise when turned on. It is not pumping water. Just making the noise.

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  • 1,378 Answers

Thank you for posting your question here on Fixya.com.


It could be the pump is bound up but it is more likely the motor is failing. It may be a small part such as the capacitor or the starting switch, but could also be more severe such as the winding itself. You will also want to examine the shaft where it passes thru the pump and motor and look for signs of rust from a pump seal leak.

If you are not familiar with testing these parts your best bet would be a local electric motor repair shop to see if the motor can be repaired or if it would need to be replaced. They should also be able to ensure there is no pump damage.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


John

Posted on Oct 05, 2010

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When I turn on my STA-RITE 1.5 HP pump, it makes a humming sound.


A humming noise is fairly normal if the pump is running and pumping correctly. I am guessing this is not the case. Usually it is just a stuck impeller that is the culprit. Power down the unit and open the pump housing to access the impeller. Then gently turn the impeller feeling for resistance (some resistance is normal from the magnets of the motor). If everything seems ok close and secure the pump housing. Try powering the unit on and see if it starts up correctly. If it is still having issues manually prime the pump. If the pump runs correctly for a few minutes after manually priming but slows or stops you have a leaky seal or fitting to find. Finding the seal is not hard but will take a little time and patience. With your garden hose, very carefully run water over each joint and fitting with the pump running. It will take a minute or so of water running over a leaky seal for the pump to prime so take your time. Make sure not to get water on the motor as it can deliver a very nasty shock and destroy the motor. If none of this gets you up and running the cause may be the motor is bad and needs replacing.

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1 Answer

When I turn it on it just makes a loud humming noise. Any ideas?? Thanks


Check to see if you can turn by hand, Open housing and do this. Turn on and see if you can spin it and make it start(CAREFUL) If it won't turn ether when off or while it has power going to it, UH-OH! it's time for a new motor. If it will turn and starts when you spin it, it is probably just a start capacitor. Good luck.

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1 Answer

The noise sounds like a much louder humming sound; Temperatures were well below freezing here last night


I'm not sure what your humming is much louder than. But if you had a freeze your pump may have froze and you will need to ck for leaks after thawing. You could have cracked your pump or hurt the seals. After you check for this, you can check for a weak start capacitor in your motor, as the cold can affect these also. Good luck.

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Sta Right model P2RASF-182L (RPM 3450) sounds like the bearings are gone...turns on, but is very loud and gets very hot.  The water is not circulating either.


If the noise you are hearing is like a grinding, then the bearings are gone. Sta-Rite does not make the motors for their pumps, either AO Smith, or Centurian, makes them, so they recommend that you replace the motor with a new one. You can try a small motor repair shop in your area.

If it is an AO Smith motor, you may be able to find more information at the following website:

http://www.aosmithmotors.com/html/products/productLiterature.html

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if it is a used pump, these have a tendency to have a little rust. just get some pump pliers and rock the shaft gently back and forth. then plug it back in.
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