Need a s8 sharpener

SOURCE: Berkel 827 sharpener not working properly

Your grinding stone stud is more than likely frozen try and lossen it up with a little penetrating oil take the sharpener off and work both stone back and forth untill they are both spinnig freely and remember do not apply either sharpening wheel on the knife for more than 5 seconds at a time you can burn the wheel and then it will never get sharp