I really don't know when my problem started as far as hours go. I do remember that the tractor was still under warranty when it first happened, but I didn't want to make a 4hr (each way) trip to my dealer. ( I'm so far west in Kansas, I'm almost in Colorado). My understanding is the stretching is due to torque from the tractor. It may all come down to how you use/abuse your tractor. I have worked my tractor fairly hard at times. Kioti tractors are made from the same manufacture, so I would assume that they would have the same problem. I don't know if there is a serial number cutoff where you could research the problem starting. Maybe if you took the info that I got from this website to your dealer, they could find out a date or serial number where they started the "fix". If you haven't located the bolts that are in question, send me your e mail address and I will take some pictures and e mail them to you. A large piece of cardboard placed permanently under your tractor where you store it, will give your first indication of leakage/loose bolts. Thanks to all of the help. JP