Harvest - Conventional Concaves

With Harvest Services Precision Bored Concaves, the entire concave fits the cylinder allowing the entire concave to be used for threshing and separating. They start out as a precision concave and because they are stronger, they keep their shape and remain a precision part. This is especially important when harvesting crops with straw or smaller seeds. One high bar is enough to significantly increase walker loss, white caps and cracked kernels. There are no high bars on a Harvest Conventional Concave.

With the Harvest Services Conventional Concaves, the threshing area, or the first third of the concave, is covered with Filler Plates. The separation area of the concave, the back two-thirds, is open to allow the grain to fall through. Filler Plates allow you to fine tune your concave to obtain maximum threshing and separating performance. Adding or removing Filler Plates is a simple operation that typically takes about five minutes with the concave in place. Filler Plates hold the heads in the wedge between the concave and the cylinder so they can be threshed completely and not pushed through the concave and onto the shoe or walker in the form of unthreshed heads. Without Filler Plates, white caps and unthreshed heads are knocked through the front third of the concave and threshing is done by the impact of the cylinder bars striking the heads and not by gentle rubbing.

Threshing cereal grains properly requires more bar above the Filler Plates. The wires have to be placed deep enough to allow a minimum of 3/8″ of bar above the Filler Plates to form a deep enough pocket to hold the heads long enough for the cylinder bars to rub the seeds out of the head.