No offense, but see dealer for details. Our Dealer out of Bismarck ND didn't know Jack about the problem when it happen to us last year. They gave us the good old fashioned, "the new ones don't do that" $n!^, we just bought a new one two years ago. I"m sorry, I am just really po'd with Cat right now. They don't stand behind anything. WE had the same problem. I heard of one other guy having that happen in canola, but it happen to us in really thin, short straw wheat last year. This year yields were better and it didn't do that. lets just say thats not the only problems with those "rotors" Cat thinks are so great. They are nothing like the rotors in a TR_CR