An agricultural harvester (10) including a chassis (12), and a threshing section (24) carried by the chassis (12). The threshing section (24) includes a rotor (40), a plurality of frame assemblies (72, 74, 76, 78) adjustably positioned proximate to the rotor (40), a plurality of concaves (42) and an adjustment mechanism (70 or 170). Each concave (42) is carried by a corresponding frame assembly (72, 74, 76, 78). The adjustment mechanism (70 or 170) is coupled to the frame assemblies (72, 74, 76, 78). The plurality of frame assemblies (72, 74, 76, 78) are X frame assemblies (72, 74, 76, 78), with X being 2 or larger. The adjustment mechanism (70 or 170) has at least one actuator (92, 94), with there being Y actuators (92, 94), with Y being 1 or larger. The adjustment mechanism (70 or 170) is configured to adjust each of the X frame assemblies (72, 74, 76, 78) to different positions with Y actuators (92, 94), where Y is less than X.
