Combines bad wheat sample

Which rotorIJ Which concavesIJ Which gratesIJ Was the MOG in the tank threshed or unthreshedIJ

first concave s wire second and third l wire .speciality rotor.sliding vanes middle position.keystock rear grates.sample containing alot of unthreshed heads.moisture 20%.in ireland we have large volumes of straw.concave set as tight as possible aprox 1 to1.5 .tighting bottom sieve any more overloads returns with unthresed heads but also returns too much clean grain.put 2500 hrs up on my 1460 without same problem .do i need different sieves rotor bars grates etcIJall help greatly recieved.cheers andy

Trade it off for a John Deere, end of problem

Andy,your harvest conditions are different on that side of the pond so will post some suggestions and you decide if they will work.I would first take down the concaves and examine the condition of both the rotor and the concaves for worn rounded corners.The specialty rotor design in part is made to auger the straw through the whole system, whereas the standard rotorhas some built in retarders ( so the specialty can be less forgiving). While doing this bottom out the conaves and reset the gauge so the reading is accurate.I just mention this to set a base to start and maybe duplicating what you have already done.The wheat needs to get threshed in the concave area and unthreshed heads indicate a need for more action in that part or the rotor area.I would open up the concaves and speed up the rotor to start with. keep the rotor rpm's just under where you get broken kernals.Opening the concave allows less grip for augering and more speed makes more centrifical force to keep the heavy kernals to the outside and receive more rubbing action(within limits).IF 6you can't get acceptable results the next thing would be all smaal wire concaves or cover plates or both. Hope this makes sense and is helpful..good luck....Steve

Andy, I would start by putting covers on the first concave. If you don't run corn, you should be able to leave them on all the time. Next, I would check the left-to-right concave position. the normal position is for the rotor bars to be closest to the eighth concave bar from the left. For more aggressive threshing, adjust the concave so that the seventh bar is closest. It might be possible to go even further, but I have not tried that. I would not bother putting in more small wire concaves because I have not been able to tell that they improve the threshing of tough wheat. You can retard the vanes over the front of the rotor and see if that helps. It will use more engine HP. You could consider putting rice spikes on to improve separation. I would start at the back of the rotor and work forward. Maybe a dozen to start withIJ When you finally get the threshing aggressive enough to get the wheat out of the heads, you may still have too much return volume. The easiest way to fix that is the fan deflector installed in the throat of the fan. It will keep light material suspended the full length of the chaffer which really minimizes the return volume.

Sounds to me like you need to put Gordon bars on front end of you rotor to inprove threshing over the concaves. This is a shortcoming of the specialty rotor in hard to thresh conditions. Or get a new AFX rotor. Click on "attachements" at the left side of the page and you'll find info on Gordon bars. Or click feedback up above and you can send Marvin Gordon an email.

Im in Scotland so conditions are similar. In wheat we use 3 large wire concaves with 2 cover plates over first concave. This combination gives more aggressive threshing reducing "white caps" while still maximising grain removal from rotor. Problem is you overload sieves with MOG. This year we fitted airjet chaffer and I cannot praise it highly enough. No one should run an axial flow without one! In UK we have to use oat and bean screen in wheat as well as oats and barley as high moisture wheat screen is too small. I know Marvin is trying to get tooling to make screen in between these sizes which should further improve wheat sample. I bring crates of parts from US and Canada twice a year so if you want anything shipped e-mail me.