Control outside of cab is for the Auto header height control for a series 2 flex head; get a manual to determine it's operation. Should have walker risers,cob sheild behind raddle, hardened feeder beater fingers, slow speed cylinder sheave,perforated elavator bottoms, screens on bottom of walkers and a few more optoins I don't remember. We always leave the chopper on for corn; never any problems; we find it necessary to spread residue in no til conditions. There should also be an extra chaffer; they are a graet machine in corn. Ben.