Combines Cleaning up Sample

The six "corn bars" are separating bars on the rear half of the rotor and will have little effect on threshing whether you keep them in or remove them. They will effect how much horsepower is required since they slow down the movement of straw. Whether your remove them are not depends on how much separating capacity you need compared to available horsepower. The unthreshed heads are of course a threshing problem. There are several reasons these heads are not getting threshed out the first time through the rotor. Some of the things you must do is seal up several "leaks" in the system. The Gorden Cover Plate kit will help a lot with the leaks. Next you must build more threshing pressure to get the crop to rub harder against itself. Gorden Rotor Bars will get most of the crop to the pinch point and increase threshing pressure. Slowing down the movement of material by adjusting your vanes to a more verticle position will also increase pressure. Your concaves need to have square edges on the cross bars to increase retarding action which will also increase pressure. If you do the above, the number of unthreshed heads getting to the cleaning system will be much less. Changing over to the AirJet chaffer will keep any remaining unthreshed heads out of your grain tank as well as chaff. For more information on the solutions suggested above click on the link below.

Do you have the return monitorIJ If so, how much return are you gettingIJ The lower sieve at 3_4" seems very open to me. Have you tried the fan at higher speeds and if so, did it blow grain out the backIJ I would try decreasing the concave clearance to get the rest of the heads threshed, and speeding up the rotor until you start cracking a little grain.

Have you done a kill-stall in order to determine what's happeningIJ I'm a little cautious about suggesting this, since with the volume of material and toughness of straw, you might slip a rotor belt or stress the bolts which hold the rear spline to the rotor. However, you should determine where the unthreshed heads are coming from. If you find them under the threshing concaves, a cover plate, at least under the first concave section, is probably called for in order to keep the heads from being forced thru before threshing. This would allow you to set the concaves more tightly for thresh, also. Is there a chance that you have interrupter bars installed in your front concave section as a preventative against whitecapsIJ These will close the space between crossbars and won't allow material to be retarded for thresh by the concave crossbars. Again, cover plates under the concaves are much more effective, since they allow the open area between crossbars to be maintained. If you see unthreshed heads under the keystock grates and very few under the concaves, this can also be caused by interrupter bars or in the case of badly worn concaves, by the cover plates, as well. In this case, it might be best to do as Farm Kid suggests and close up the concaves (speeding up the rotor a little will be necessary in order to feed the machine) for thresh. In your conditions, this will likely tear up MOG more than at present, but it's probably necessary to assure a good thresh first. Keystock grates--As opposed to the flat perforated grates, these will help to prevent rotor loss since they have crossbars which retard the flow of material. However, this retarding action also pushes more trash to the shoe. Smaller MOG components caused by tighter concave setting and faster rotor speed will likely compound this problem. A suggestion would be to make some filler strips from some 2" wide strips of metal and bolt them to the bottoms of the grates, filling alternate openings between the mainframe components from right to left. These would suspend quite a bit of MOG, but still allow for grain separation. You'd be converting the grates for operation similar to flat grates, but with the added advantage of retardation. Corn bars--These catch material and cause it to roll at an angle parallel to the crossbars of the keystock grates and keep cobs from shattering. However, they also will force MOG thru the grates, as well. An alternative to installing fillers under the keystocks might be to remove the front set of these and replace them with rotor bars in order to keep MOG loose and fluffed instead of piling up and being forced thru the keystocks. There's more to this, but this is probably long enough for now, and I hope not too confusing.