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

Your motor bearings are failing. It is most often caused by a leaking pump seal. It is a relatively inexpensive repair if it is caught early enough; before the shaft is damaged from the corrosive water eating into the steel. Take it to a local electric motor repair shop for inspection. It will likely need a set of 203 bearings for the motor and a mechanical seal for the pump. All told, depending on the labor rates, it should be less than $75.

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John