Sieve for an agricultural harvester with adjustable louvers and associated adjustment assembly

A cleaning system for an agricultural harvester, comprising:

• a sieve comprising:
• a sieve frame defining a top side;
• a plurality of adjustable louvers carried by the sieve frame and defining a plurality of apertures;
• at least one adjustment bar coupled to the plurality of adjustable louvers such that displacement of the at least one adjustment bar changes a size of at least some of the plurality of apertures;
• and
• an adjustment assembly comprising:
• an adjustment arm coupled to the at least one adjustment bar and pivotable relative to the sieve frame such that pivoting of the adjustment arm about a pivot axis displaces the at least one adjustment bar, the adjustment arm carrying a locking pin that is displaceable between a locking position where the adjustment arm is not freely pivotable about the pivot axis and an adjustment position where the adjustment arm is freely pivotable about the pivot axis;
• and
• a shaft disposed on the top side and coupled to the adjustment arm, the shaft being displaceable such that displacement of the shaft from a first position to a second position causes a corresponding displacement of the locking pin from the locking position to the adjustment position;
• and
• a clean grain auger disposed below the sieve and configured to receive clean crop material that passes through the plurality of apertures.

An agricultural vehicle, comprising:

• a chassis;
• and
• a cleaning system carried by the chassis, the cleaning system comprising:
• a sieve comprising:
• a sieve frame defining a top side;
• a plurality of adjustable louvers carried by the sieve frame and defining a plurality of apertures;
• at least one adjustment bar coupled to the plurality of adjustable louvers such that displacement of the at least one adjustment bar changes a size of at least some of the plurality of apertures;
• and
• an adjustment assembly comprising:
• an adjustment arm coupled to the at least one adjustment bar and pivotable relative to the sieve frame such that pivoting of the adjustment arm about a pivot axis displaces the at least one adjustment bar, the adjustment arm carrying a locking pin that is displaceable between a locking position where the adjustment arm is not freely pivotable about the pivot axis and an adjustment position where the adjustment arm is freely pivotable about the pivot axis;
• and
• a shaft extending disposed on the top side and coupled to the adjustment arm, the shaft being displaceable such that displacement of the shaft from a first position to a second position causes a corresponding displacement of the locking pin from the locking position to the adjustment position;
• and
• a clean grain auger disposed below the sieve and configured to receive clean crop material that passes through the plurality of apertures.