This pivot pin connects the walker assembly to the drive linkage in the threshing unit of a combine harvester. It acts as the pivot point for the oscillating walkers, transferring motion from the crank mechanism to the walker frame. Wear on the pin bore or the pin itself introduces slop in the linkage, which reduces walker stroke amplitude and can lead to uneven separation of grain from the straw walker bed. The pin is machined to the original clearance specification for the walker bushings, so no reaming or bushing replacement is required during installation.