I think you maybe mistyped the model number? Could it have been a 20711 instead? Regardless, I have a solution to your question. How about a manual with pictures and procedures? Belt replacement is covered in Section 8. If anything isn't completely clear, please let me know and we'll discuss...
You are so very welcome. You'll need the free Adobe Reader software to open it. Most already have it, but if you don't it can be downloaded at:
I have to go somewhere, but I'll check back in later to make sure you were able to make it work. I tested the file to make sure it was valid and intact, so I don't think you'll have a problem. It might take a few minutes to download depending on your connection speed. It's a full drive system manual, so you might want to keep it for future reference.
Thanks Rick...Got it to open. Good info. I think I am good.