check all your loading auger gearboxes on 10 and 50 series combines, deere has come out with an update for these boxes. the original box has a straight shaft with a key on the input I.E. pully side of the box, it has sheared the key in most instances. Deere has unpdated the box to a tapered input shaft to stop the shering of the key. IF you are under warrenty, get it done now............