I have a craftsman CMXGRAM1130045 riding mower. The electric PTO is making a loud noise when not engaged. I have been told it is a bad lower bearing. My question is it practical to replace the bearing or should I replace the entire PTO? The Craftsman prart is 91705209. I have found the same part number at a cheaper price but it is listed for a Cub Cadet. Since it the same part number will it interchange? Thanks.