All the ideas here are great but before you start pulling things apart look in the pump really good for something in the impeller area or even a piece of stick or wood thats
lodged in between the impellor and the wall of the intake. You could just be cavitating.
Neighbor had a problem once. Told him he was cavitating bad and to check it on the lift. He swore he looked in there good - I said let me see. I found a diving fishing plug lodged inbetween two of the vanes of the impeller. Pried it out (literally) and all was good again.
The whining part you described is interesting (and scary) though....
lodged in between the impellor and the wall of the intake. You could just be cavitating.
Neighbor had a problem once. Told him he was cavitating bad and to check it on the lift. He swore he looked in there good - I said let me see. I found a diving fishing plug lodged inbetween two of the vanes of the impeller. Pried it out (literally) and all was good again.
The whining part you described is interesting (and scary) though....
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