Belt came off the john deere 650 belly mower; need a diagram and any facts/suggestions to make it easier to get it back on...

Hi,
Unfortunately you have give the tractor model, not the deck model. There is a tag on the deck with probably 13 alphanumeric characters that tell about the deck. See the link to see what I can get:
John Deere - Parts Catalog (http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePa geServlet_Alt)
Peace,
Clarke