ADJUSTMENT ARRANGEMENT FOR OFFSET SPACING BETWEEN LOUVRES IN A SIEVE OF AN AGRICULTURAL HARVESTER

A sieve (48, 50) for use in an agricultural harvester (10) includes first and second adjustment laths (116A, 116B) arranged longitudinally adjacent to each other. The first and second adjustment laths (116A, 116B) are movable in fore and aft directions relative to an air flow direction (Y) through the sieve. The first adjustment lath (116A) is connected with a first set of louvres (112A) and the second adjustment lath (116B) is connected with a second set of louvres (112B). An adjustment arrangement (120) for adjusting an offset spacing (X) between a first and second set of louvres (112A, 112B) includes a rotatable elongate element (122) with a longitudinally facing stepped shoulder (124) and at least one stop surface (126). The elongate element (122) is connected with each of the first and second adjustment laths (116A, 116B). The stepped shoulder (124) includes a plurality of stepped surfaces (124A) which are selectively engagable with the at least one stop surface (126). The stepped surfaces (124A) respectively define incremental offset spacings (X) between the first and second set of louvres (112A, 112B).