Is it age or just too much going on? I took the deck off my John Deere L130 today to sharpen the blades like I have so many times before, but this time, I forgot how the belt goes back on! For the life of me, I couldn't get it, so I searched the net and found nothing but junk, from ehow to wiki-xyz and none had anything useful.
I had to look at the manual which was also cryptic but finally figured it out, so I decided to take a photo of my l130 belt routing and draw a diagram along with the picture. Simply click on the thumbnail to see the large routing photo.
My diagram won't win any prizes, but it clearly shows you how the belt routes around the wheels.
By the way, if you have this tractor and have not read my page on John Deere stalling or better yet, my section on Deere's junk transmission they installed on these guys, then do so - it will save you a LOT of time!