Combines Cobs Cobs and MORE cobs

I am beginning to believe that cob breakage is just the nature of the R series gleaner. I have owned my 62 for 4 years now and it has always ground the cobs. The only way I can keep them out of the grain tank is to close the sieves down, especially the bottom one. You will run a VERY heavy return and if I run over 3.5 mph I will loose corn out the back. This is with an 8 row corn head. Probally not the answer you were looking for but it's the only thing I have been able to come up with.

I have run a lot of corn through an n and r series combine and cobbs in the bin had not been a problem. FIRST.....NO RETURN. There is no reason to run return in corn, it is not like you can threash it anymore. I stand it straight up. Closing it also limits air to top. Close the top just enough to keep out fodder. It could be by keeping running return all you are doing is adding to problem by grinding up more. When you say hyperized that can meen a lot of things. What bars do you have inIJ What kind of helicalsIJ Which concaveIJ What is concave wedge set likeIJ Are cobbs being broken up at headerIJ Are feed chains on slowIJ Where is air settingIJ It is pretty hard to blow out corn, turn it up. What do acc. rolls look likeIJ Problem can always be made better......send a little more info. VSTK

First off my 62 is a stock 1992 model. New acc rolls this fall Feed chains on slow Right now concave 11 speed 330 air at 6 The return is all cob, no corn coming around just sorting out the small pieces of cob If I run the sieves standing straigt up it looks like the old corn cob mix they used to feed cattle. I have tried every concieveable cyl speed clearane combination you can think of but nothing will put whole cobs out the back of this machine.

how wide are you running the wedgeIJIJIJIJ that is what always gets the cobs out for me. I thought there was no way to get them out until I adjusted that I run mine between MID and MAX.

I thought the same thing until I put some wedge in the concave and now there is no cobs to speak of. What do you have yours set onIJIJ Illinois Gleaner

lets see.... Sunnybrooke narrow space concave,extendended helicals,disrupter wedges installed in seperator section,chafer mod,no reverse bars, f bars in bottom of seperator section,every other wire removed. cylinder is running in the 240rpm range ( have tried slower and faster) , various concave clearances have been tried, will have to check the wedge setting and get back to you,machine does not have the return to cylinder option,air set at 7, and acc.rolls were installed new prior to harvest.Rotor loss is low and very little corn going over the back.

I would shure look at the setting for the back of the concave. Closer to the widest setting is a good place to start. Another question for you, has the concave been leveled and then zeroed on guageIJ You said you have f bars in sep. section, do you have a seperator concave or just f bars in bottom of sectionIJ If grinding cobbs, they may need to move through better. Fill bottom of cage with helicals and removed f bars. What works in one situation in one parts of the country doesnt always work some where else and when modifyiing like you did it may take a bit of fine tuning to work for your conditions. As for the return to acc. rolls, the same rules apply. Dont run any return!!!!!!! There is no bennifit, and lots of negatives.VSTK

Ok, lets look at a couple things. You state "The return is all cob, no corn coming around just sorting out the small pieces of cob". That is only adding to problem. It doesnt matter what condition the cobs are at back of machine , only that they arent in the bin. Whole cobs are over rated.....nobody scores them, only grain at elevator. One solution may be to not grind it up as much. You need to adjust the"wedge" of the concave. How many reverse bars do you have inIJ Have you ever tried pulling every other row of bars outIJ if the cobbs do make it to the shoe you have to get rid of it before the seive. More air or adjusting chaffer. I start with air wide open and may turn it back some but not much.Which chaffer do you useIJ Just remember any thing you clean out at seive just becomes tailings return and adds to the problem.

Are you talking wedge in the concave or seperator grate. Dave

Ok, here's the real set-up. First channel helical extended over feeder. New narrow space forward bars on first two positions. Worn forward bars,two narrow,two wide on third row,other four bars replaced with discharge paddle back-ups. Four bars extended to discharge,four extended bars with discharge paddles. Have tried rear concave at 7_8 to 1 1_4 inches. lower front of concave to almost max when gauges set by the book. Have tried 250 to 450 rpm. More rotor loss at slower speed. Using square tooth corn chaffer, standard seive, both non-modified. Corn is white cob,180-220 bu_acre,running 25-28%. Maybe it ain't gonna get any better. If I close the chaffer or seive to remove cobs ground speed is very slow. Can run 6-30 at 3.2-3.4 as set now. How fast should I be able to go. Monitor is recording 1550-1700 bu_hour. Can anyone give me a refresher on the concave wedgeIJ I printed the thread that detailed this some time ago, but can't find it in my files, search function won't work for me. Sorry about the length but this is really frustrating. Rob.