Abstract: A sieve for use in an agricultural harvester includes a framework with a pair of opposed side members, and a first cross member extending between the side members at one end of the side members. A plurality of louvres extend between the pair of opposed side members. A pair of adjustment laths are respectively associated with and movable generally parallel to the side members, with each of the adjustment laths also being connected with the plurality of louvres. The sieve has an adjustment arrangement positioned below the plurality of louvres. The adjustment arrangement includes an actuator and a frame. One end of the actuator is connected to the first cross member and the other end of the actuator is connected to the frame. The frame has a pair of outboard ends with each of the outboard ends being connected to a respective one of the adjustment laths.

Abstract: A sieve for use in an agricultural harvester includes first and second adjustment laths arranged longitudinally adjacent to each other. The first and second adjustment laths are movable in fore and aft directions relative to an air flow direction (Y) through the sieve. The first adjustment lath is connected with a first set of louvres and the second adjustment lath is connected with a second set of louvres. An adjustment arrangement for adjusting an offset spacing (X) between first and second sets of louvres includes a rotatable elongate element with a longitudinally facing stepped shoulder and a stop surface. The elongate element is connected with each of the first and second adjustment laths. The stepped shoulder includes a plurality of stepped surfaces which are selectively engagable with the at least one stop surface. The stepped surfaces respectively define incremental offset spacings (X) between the first and second set of louvres.