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Rotor concaves are an important component in the threshing and separating processes of Axial-Flow combines. They are part of the three-section concave system in the rotor cage area. The concaves hold the material long enough to ensure complete threshing and have enough capacity to permit the grain to separate into the cleaning system. The clearance between the concaves and the rotor rasp bars can be adjusted to match the threshing difficulty of the crop. A close setting is preferred for harder threshing conditions, while a wider setting is recommended for easier threshing conditions. The concave clearance should not exceed setting Number 5. Additionally, concave wires, filler bars, and interrupter bars can be removed or added to further adjust the concave setting. It’s important to note that rotor speeds and concave clearances should be matched to the crop and conditions for efficient operation. Incorrect settings, such as running the rotor too slow and the concave set too open, can result in inefficient threshing and separation, leading to losses in machine capacity. Adjustments should be made one at a time and compared to the original setting. If rotor losses occur, various corrective measures can be taken, including checking for plug and crop material, adjusting rotor speed, configuring the channels on slotted grates, using wide wire spaced concaves, adjusting the concave vanes, increasing rotor speed in certain crops, and potentially slowing ground speed in heavy or high-yielding corn crops with large amounts of material other than grain.

REFERENCES

2388 Axial Flow Combine Operators Manual (P. I.N JJC0290500… Page 186-188

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