A legume sheller having both an air separator and a sieve separator for removal of residual chaff or trash. Airflow through a screen carries legumes and trash upward, wherein most of the lighter trash is carried farther up the separator and over into a trash retainer. The legumes, and some residual larger pieces of trash, fall over a weir onto a sieve. The sieve has holes therein that permit the legumes to pass through into a collector. Slidable plates adjust the hole dimension. A vibrating table facilitates movement across the downward sloping sieve surface. Baffles prevent the legumes from rolling too quickly across the sieve. The sheller is equipped with a reversing conveyor that carries trash to a bag.