Had the same problem with my R65. The cause of the problem is that you probably don't have a screen underneath the hydro, therefore allowing leaves to enter into the fan. Seem as though AGCO was trying to cut cost. My dealer told me about removing the last row in the chaffer. However I felt that was a band-aid approach. Made them give me the same screen that the 62s have there, never had a problem since (keeping the last row in).