Abstract: A concave apparatus is provided for use in a twin rotor combine harvester which includes replaceable concave inserts which are carried in a concave support frame including two side rails which extend around a portion of each rotor from a bottom of the rotor outwardly around approximately 90 degrees. The frame includes transverse connecting bars at right angles to the side rails with an upper bar, a center bar and a lower bar defining between them openings for the concave inserts. An upper transverse bar of the lower concave insert has fastener holes to receive coupling fasteners for connection to the center transverse bar of the concave support frame and has a projecting portion lying in an axial plane and projecting radially outwardly to a position beyond the center transverse bar of the concave frame with fastener holes therethrough for attachment to pivotal bracket of the combine harvester.

Abstract: A system to detect grain loss of a harvester during harvesting operations. The system includes at least two pans magnetically supported on the harvester above a ground surface, by separate electromagnets being electrically isolated from a power source while magnetically supporting the at least two pans. A signal controller generates a release signal when triggered by a user. A signal receiver responsive to the generated release signal electrically connects one of the electromagnets with the power source causing one of the at least two pans to be released to the ground surface while the second electromagnet remains electrically isolated from the power source and magnetically supported on the combine harvester until another release signal is triggered by the user causing the signal receiver to electrically connect the second electromagnet with the power source to release the second pan to the ground surface.