A sieve for use in an agricultural harvester includes a framework with a pair of opposed side members. A plurality of overlapped louvres extend between the pair of opposed side members and are overlapped relative to each other. The opposed side members are each comprised of an extruded metal side member with a partially open elongate channel having a predefined cross section, and a polymeric strip having a mating cross section carried within the elongate channel.

A sieve assembly for an agricultural harvester includes a cleaning shoe having a pair of opposed side rails, and a sieve which is removably installed within the cleaning shoe at a selected location against the side rails. The sieve has an upstream end defining a first angled surface, and a downstream end defining a second angled surface. The cleaning shoe includes a first engagement surface for engaging the first angled surface, and a pair of bolts, with each of the bolts being pivotally attached relative to a respective one of the side rails and engageable with a respective second angled surface. Each of the bolts has a longitudinal axis that is positioned at an acute angle (β) relative to the side rails of the cleaning shoe and biases the first angled surface into engagement with the first engagement surface when the bolts are tightened against a respective second angled surface.

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.

A combine harvester includes threshing apparatus, separating apparatus, a grain cleaning system located downstream of the separating apparatus, and a material conveyance system arranged to convey crop material from the separating apparatus to the grain cleaning system. The grain cleaning system includes screening apparatus, a fan arranged to generate a cleaning airstream through the screening apparatus, and a fan control system configured to control a fan speed. The fan control system includes a proximity sensor mounted above the material conveyance system for sensing a material volume. The fan control system controls the fan speed in dependence upon the material volume.

A concave section for a harvester includes a concave body having an upstream side, a downstream side, a leading end and a trailing end. The concave body defines an arcuate crop engagement face facing radially inwardly. A plurality of crop passage openings are defined through the arcuate crop engagement face. A cover is configured to at least partially cover at least some of the crop passage openings. The cover is carried by the concave body and is movable thereon between at least two different positions to adjust a degree of openness of at least some of the crop passage openings.

An embodiment includes a combine having a feeder housing for receiving harvested crop, a separating system for threshing the harvested crop to separate grain from residue, a residue spreader wheel spinning for expelling the residue from the combine, and a controller that controls the combine. The controller is configured to control the residue spreader wheel to continuously oscillate between a first speed less than a nominal speed and a second speed greater than the nominal speed while spreading the residue.

A grain cleaning system in an agricultural harvester, that includes a chaff pan with a pivotal axis near an end of the chaff pan. The chaff pan has a dual locking system coupled thereto for holding the chaff pan in two different positions. The dual locking system has a first over-center locking arrangement and a second over-center locking arrangement. The first locking arrangement is used to hold the chaff pan in an upward position when the first locking arrangement is locked. The first locking arrangement includes a first linkage element; and a second linkage element. The second locking arrangement holds the chaff pan in a locked downward position when the second locking arrangement is locked. The second locking arrangement includes a first linkage element; and a second linkage element. The first linkage element of the first locking arrangement is also the first linkage element of the second locking arrangement.

A grain cleaning system in an agricultural harvester, that includes a chaff pan with a pivotal axis near an end of the chaff pan. The chaff pan has a dual locking system coupled thereto for holding the chaff pan in two different positions. The dual locking system has a first over-center locking arrangement and a second over-center locking arrangement. The first locking arrangement is used to hold the chaff pan in an upward position when the first locking arrangement is locked. The first locking arrangement includes a first linkage element; and a second linkage element. The second locking arrangement holds the chaff pan in a locked downward position when the second locking arrangement is locked. The second locking arrangement includes a first linkage element; and a second linkage element. The first linkage element of the first locking arrangement is also the first linkage element of the second locking arrangement.

A system for detecting a condition indicative of onset of plugging or actual plugging of a discharge of an agricultural combine, utilizing a pressure sensor disposed at a location within the combine spaced from the discharge and operable for sensing an air pressure condition relating to a flow indicative of a reduced crop residue flow condition toward or in the discharge.

A cleaning system for an agricultural harvester includes: at least one sieve; a cleaning blower directed at the at least one sieve and configured to supply a cleaning air flow directed at the at least one sieve; and a conveyor assembly configured to supply crop material to the at least one sieve. The conveyor assembly includes: a conveyor frame; a shaker coupled to the conveyor frame and configured to shake the conveyor frame; and an endless conveyor carried by the conveyor frame and including a conveyor loop with a substantially solid surface and a conveyor driver coupled to the conveyor loop, the conveyor driver being configured to selectively rotate the conveyor loop.