Comparison of John Deere threshing systems

Due to increased performance requirements non conventional threshing systems have migrated into the combine market in the recent years. This paper discusses advantages and disadvantages of the threshing technologies John Deere is using: 1) A conventional separator comprising a tangential threshing device and walkers: There are different versions running in North America and Europe due to the differences in main crops, yields and climate. Europe requires harder threshing and Walker Aids. 2) A threshing device in conjunction with non-conventional axial rotors for grain separation. The rotor package is characterized by an eccentric configuration of rotor and housing and tines as the conveying elements. 3) A non-conventional system using just on rotor for threshing and separation. A two speed feed beater splits the material flow up into three partial streams. The rotor housing features three sections: Feeding, Threshing and Separation, that consecutively opens up at the top. Angled tines and threshing elements are equipped with the rotor.