Go to jdparts.deere.com look up your mower and deck combination and it will show the belt laid out like it goes on the deck, not the best picture but it should help. You should check over your deck to make sure all the idlers and spindles spin freely and don't have play up and down which could be a sign of bearing failure. In most cases a belt that jumps off means you have a problem with the deck somewhere, otherwise it wouldn't have come off.
Jdtech4413, July 2011
