How do you replace the drive belt on a John Deere L100 Lawn tractor?

You must back out three bolts which hold plastic cover over left side spindle pulley first. After cover is removed (or at least two rear bolts are removed allowing cover to be pulled up ) work belt onto this pulley and reinstall bolts on cover. Then, you must loosen idler pulley next to pulley you just placed belt on as to thread belt onto idler pulley which has a metal fence mounted on pulley shaft to keep belt on this idler. Belt must then be threaded around on/off pulley and right spindle pulley and drive pulley.