If you have the manually locking hubs on your rear axle, they might be in the unlocked position. When they are in this position, the hydraulic oil bypasses the axle and it also messes up the drive to the main wheels or something like that. We leased a 9610 w_ this setup and whenever we hit a little mud, the combine would just stop with the stick all the way forward. Finally called the dealer to come out and look at it because we weren't getting anything cut, and he said all we had to do was to lock the hubs in. Fixed the problem, but remember to unlock them whenever you go down the road or else one of the wheels might lock up.