This usually indicates that the motor bearings are defective. (see question #1) Replace the bearings. If it is an older motor we recommend that you replace it instead. In either case, replace the pump shaft seal when re-installing the motor. Occasionally this problem is caused by an object lodged in the pump’s impeller and can be solved by dismantling the pump and clearing the impeller. Always turn the power off at the breakers or fuse panel before attempting a repair to the pump or electric motor.
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