Good night to you.
The service manual has the procedure, with pictures, as to how to replace parts and make adjustments in Section III, starting on page 28. Start looking from that page going forward until you come across how to replace the belt. You can download a copy of the service manual by clicking here.
Sorry about that John. I have been trying to find a different manual and have been unsuccessful thus far. I will keep trying and get back to you in a few days.