Combines HIGH MOG Wheat Mods

My N7 has most of the Hyper mods. I do not have stacked helicals our channeled. I have the hi_low setup on the seperator, F2 bars and extra discharge paddles. Standard bars and concave. Our wheat was down this year. Very heavy straw and mid to upper 50's yield. I ran 3.8 to 4.5 mph (27' header) and boost range from 15 to 25psi, Cylinder 850 to 950rpm and concave between 5_8" to 1_2" gap, chaffer 3_4", sieve 7_16", air wide open at 7. Sample was good even in trashy spots. FM average less than 1%. loss was less than 1 bu per acre. I still run the cage sweep. My limiting factor is the header not feeding well in these conditions.

Been a while since we had and N7, But all I could offer is that you might want to try some Chopper bars!!! they are the ones with only about five or six rasps and they are nearly twice as high as a standard rasps. Theses bars would replace four or more reverses bars and they would help to chop up some of the MOG to help let grain though the cage better! We have them for the R series but Im not sure if they available for the N series!!! You could get some steel and make up some temporary chopper bars to fit your N7 these bars would fit to the rotor! you would have your flat bar bolted to the rotor then at about 35 to 50 mm apart you have a rasp at about twice as high as the standard rasp bar and at about the same angle as a forward raps bar, the rasps that you make would look a bit like a rounded sharks fin and be made from about 8 to 10 mm thick steel you could then hard face the leading edge. You can have theses chopper blades shimmed run to with in a few mm of the helicals, All this should help a lot with rotor loss and use no more power that your are using now. As with the concave you can have have a two fingered space between the concave rods to help let stuff through then you insert concave filler bars (the little strips of steel to block of the concave!!!) to help with threshing you might even have four or more filler bars in!!! this will help some what with you loading of the thresher side and help with proper threshing. Also make sure that he front of your concave is closed down to 5 to 3 mm at the front when the concave is at it's closed position! then you can progresivly open the concave till you get the right balance of threshing and rotor speed!!!!this helps with threshing as well, get that threshing right and the cleaning with tend to sort it's self out a bit!!!! hope I have made it clear enough Rolf

That sounds good we got another rain last night and I'm afraid to even look at the wheat. I'll build a set to try. That should slow the movement of material through the processor plus chop up the "Wads". I'm thinking Tine seperator, I sure like the ideal of the JD STS with the catch and release idea of the seperator section, low clearance at the bottom of the grates and high at the top.

G'day Joe E-mail me and I will see if I have any photos of the Chopper bars to send to you!! Rolf

I would rather leave helicals off of first section after concave than to install extended concave in P1. I've had more complaints of rotor loss with extended concaves installed than standard concave. I think the extended concave will end up ropeing the straw in certain conditions. The best way the guys could control loss in them conditons was to install the spike retarder bars threw cage. They must of cut open rope to allow seeds out. I think Rolfs method would be even better in your conditons. You will likely have to run just as many filler bars in extended concave as you do in standard concave. You may also want to check how concave is leveled. We have hard to thresh wheat so we zero out as all four corners. Basically you are touch all the way around at zero and front will open faster as you open up the clearance. You will get more seperation at concave if you remove wires and threshing will be more complete when you can pack more material in. Do you still run any cage covers or cage sweepIJ Do you have overfeed auger and trough in placeIJ Did you have any problem with loss on shoeIJ Did you run a stationary rasp bar with rasps oppisite angle of helicalsIJ Good luck

Hey that reminded me of a whole set of problems that I forgot about. This combine came with all covers installed on the cage door right after the concave. Since I needed more load on the right hand side of the shoe I thought easy pull them covers off, then nothing but plugging with straw between the cage and the access door at the back behind the concave, it would "bridge" and then the cage sweep would bind up. I could only run with one cover off or it would plug. I spent 2 hours on that one, combinations cylinder speed everything, then I realized that they were there for a reason. However during the runs I made with them out, it made very little difference in rotor loss. In the morning when the straw was still tough it was alright, and then I would slow cylinder speed when it started to get brittle that would last about a hour then the covers had to go back in. Thats a hell of a job hot engine compartment, must have been a small dude that engineered that area between the engine and the cage. The trough is out on this combine which I figured would be best since the wheat is hard to thresh so it gets the cylinder again (grow flax as well) and that the high amount of return might end up on the right hand side of the sieve. Only thing is it eliminates any seperation on front of cage the width of the concave. The concave is built up with keystock and wide wires but they are at the original level. At least two fingers between the wires. I know keystock ontop of narow wire space concaves is a disaster, the wires are too deep and theres no pressure to get it through the wires. Why was the modified concave roping the strawIJ Because P3's have way more concave, I've only seen pictures but it looks like its 1_3 the way around looks way better than that tiny one in the N7, Only bad thing then is it must be worse for feeding again over the feeder chain since it has to come over in less degrees. Then there is the matter of the blasted cage sweep, this combine has it and as far as I can tell has to have it. When its quits it sure starts to plug up in there. But I have another N7 here to fix up and the cage sweep is gone, with it right out of there there is more room on top and mabey it won't hang up on topIJ Too me it seems I engineering this p1 into a P3, it has everything I think I need, more concave and seperation on the right hand side no cage sweep a smooth cover in front thresher cage for the transition, since I'm not seperating there any how. Even the flax was over loaded on the left side, its easy to tell because I run low air tight sieves and walk a mat, do a kill stop and look in the back lots of material on the left side of the pan_ sieves, half as much on the right. Jeezz this got winded.....thanks for any input, I'm sure you guys have forgoten more than I will ever know about this ol N7.

I can't think of a single machine with cage sweep still installed. We remove every last piece of it from cage area. I only run the hard covers above concave at far right, and both sides of left concave arm. I build a wall straight up from left concave arm to prevent material from hanging there. If you have pluging after that look for corner or bolt head ect. that starts the straw hanging. The amount of material that reenters feeder over the top of cage is little when you have the shimmed out helical bars. With your setup I would believe shoe load is low so you may remove paddle from rear distribution auger and built tough higher so material from left rear of auger can get shifted to the right further before entering accelerator rolls. Might want to be sure auger flighting is leaning into direction of flow so it keeps it moving without pluging the auger and breaking it. I can only say I have more complaints on crop loss with the extended concave in the P1 than P1 with original concave in fair condition. I believe with the number of cross bars the modified concave has it can roll the straw to the point it will have a hard time getting all the seeds out before the discharge. That is maybe only a problem in spring wheat or certain varietys. The guys that have had that problem have installed the spike bars threw cage with good results. The P3s have a whole lot more aggesive cylinder bar so they don't have the same degree of problem in them conditions. I wouldn't worry about material coming back over feeder again with extended concave for you don't lose to much helical. The blank panel they use just after concave has helicals on it. Your right about cage sweep when it stops it plugs. When cage sweep starts a plug by piling up some straw it may stall and then things plug up all over the place. You will have alot less straw for cage sweep to deal with when you have stacked helicals as opposed to standard helicals that have a bad transition between thresher and seperator. Your right in a way about a P1 into a P3 and the front panel can be blank. let us know how you get along. Take care