I have the same issue with the same model number.
I am looking for some instructions on how to replace the kit mentioned in the previous posts. I have ordered it and the grease, but I have no clue where to even start to take this apart. Can anyone offer suggestions or lead me to a place to find a book on this? I have searched the internet and am finding very little for this model #. Sears parts site says it is not a valid model #. Go figure.