After cutting the grass yesterday the belt came off the lower deck, there are three pully's on the lower deck but I am not sure how the belt goes bck on. Can someone send me a picture of how it goes back on or what needs to be done?

Craftsman puts a diagram of the belts on the deck, look closely. If you can give me a model number I can help get a downloadable manual with diagrams. Here is a manual from another Craftsman, check page 24 http://www.managemyhome.com/mmh/lis_pdf/OWNM/98070415.pdf