Washer will not agitate, but fill up and drain.

Washer will not agitate, but fill up and drain.

My Kenmore washer fills up ok but it makes a humming sound from down in the motor area when it is supposed to do any kind or running operation agitate, rinse or drain. But, it is able to drain water, but there too it makes a humming sound. What might be my problem? Can it be fixed? Thanks Len

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