Abstract: In a harvester thresher an arrangement for uniform distribution of agricultural product on a reciprocating transporting and cleaning organs of a sieve conveyor includes an upper sieve of a sieve box which is formed so that it has a transporting component toward a side changeable in its value in dependence upon an inclined position of the harvester thresher during threshing on an inclined surface.

Abstract: In a harvester thresher an arrangement for uniform distribution of agricultural product on a reciprocating transporting and cleaning organs of a sieve conveyor includes an upper sieve of a sieve box which is formed so that it has a transporting component toward a side changeable in its value in dependence upon an inclined position of the harvester thresher during threshing on an inclined surface.

Abstract: A combined harvester has a sieve box having a receiving plate for receiving the grain threshed by the combined harvester and at least one sieve receiving the grain from the receiving plate, a drive operatively connected to the sieve box for oscillating the same in a predetermined direction, and a device operatively connected to the sieve box for changing the direction of oscillation of the latter during movement of the combined harvester over a slope inclined in a direction transverse to a longitudinal axis and concomitant lateral inclination of the receiving plate and the sieve in dependence upon the lateral inclination to thereby obtain a uniform distribution of the grain on the receiving plate and the sieve by changing the transportation direction of the grain.