Why the Harvest Services Air-Foil Chaffer works so well

On all crops (except corn and beans) at least half of the material flowing onto the shoe is a mixture of short straw, hulls and chaff. Trapped within this mixture, and making up the other half of it, is the grain you want to save. The Harvest Services Air-Foil Chaffer is designed to direct, in significant volumes, consistently uniform airflow across the entire width of the combine, upwards ten degrees from vertical angled towards the rear and will accommodate all crops and crop conditions adjusted simply through fan speed adjustments. The blanket of air created through the Harvest Services Air-Foil Chaffer prevents grain robbing matting and ensures sufficient time to allow grain to drop through the Air-Foil Chaffer’s generous openings for maximum seed recovery.

With your Harvest Services Air-Foil Chaffer there is nothing to adjust other than fan speed. There are no moving parts to wear out which translates to less downtime, less maintenance costs and more money in your pocket.

Effectively Seperating your Grain from the Chaff

The most important difference between factory open louvered sieves and the Harvest Services Air-Foil Chaffer is Uniformity of Air Pressure. Factory sieves typically have continuous openings resulting in certain sections having higher air pressure than other sections. Where there is less air pressure the chaff falls through the sieve as expected. However, sections where there is higher air pressure, the chaff, along with your grain, is blown out the back. To get an idea of how uneven the air pressure really is look at the wear pattern on the metal work above the front of the top chaffer. If it isn’t worn evenly all the way across you’ve got air distribution problems and inefficient top chaffer performance.

One of the largest crops is corn yet when compared to the majority of other crops, corn is a very clean crop to thresh. With corn there is no straw, and very little chaff or dust. In corn, all the shoe area of the combine has to do is separate the kernels from a few big cobs and some leaves. The sieves on factory equipped combines typically have open louvers with fingers. When harvesting high moisture corn the fingers help break up the mat of kernels that tend to stick together. The adjustable finger sieve is designed with many rows of continuous openings. This design works well enough in corn but problems begin with crops that have higher amounts of chaff and straw. To effectively recover your grain from these higher chaff and straw loads, Harvest Services developed our Air-Foil chaffer.

Along with the poor design of the open-louvered sieve another cause of uneven air distribution is the fan not sitting square in the housing, resulting in uneven cut-off clearance.

With the Harvest Services Air-Foil Chaffer you’ll notice improvements in Increased Capacity, Reduced Shoe Loss and Less Trash in your grain. It works great in all crops, but you’ll notice big improvements in sunflowers, wheat, barley and all of the small seed crops including flax, canola and grass seed.