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Discussion Starter #1
I have ran case all my life and currently have a 8010 case but bought a 12 cr9090 with dsp. curious what differences to expect when it comes to setting the combine for spring wheat and straight cut canola.

I am starting spring wheat tomorrow, I have new sunny brook concaves in it and the standard 1 1/8" sieves. I have the spiked rethrasher covers in. Standard rotors not the twin pitch.

Suggestions or starting points?
 

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We run with rotors at 1380 concave bout 3/8 depends on how hard to thrash. Top sieve 11/16 bottom 3/8 and 850 on wind. Rough numbers but that would be close.
 

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Ooohhh Deere
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As said above cleaning system will be similar
But the CR’s need high Rotor RPM to work the best
 

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Discussion Starter #5
So I went out and did 70 acres of wheat today testing 17. I cannot get my sample as clean as the sample in my 8010, its not horrible but not near as clean either and I am finding some long straws maybe 3" in length in the tank they are broken up not a full circular straw. I compared my sample with the 8010 in the same field. I cannot figure it out I have check for broken bent or missing fins on the chaffer and shoe, I even close my presieve completely to ensure that was not the problem and checked to make sure my arm on the presieve was connected and had not fallen off, also check the calibration on the sieves. I have tried various settings but have used the following for the last 30 acres.

rotor 1350
fan 810
presieve at 1
chaffer 12mm
shoe 3 mm
spiked rethrasher covers.

Also when I hit the headland I find that the sieve losses increase very quickly I have set the fan to drop by 50rpm in headland mode. Also my tailings sensitivity is at 50% and is running less that a third full.
I have not done a kill stall but dont see how that would help diagnose why I am getting some straws and such in the tank.

any ideas?
 

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Ooohhh Deere
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Why do you need the spiked rethrasher returns doors?
 

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New to me 9080 and mazergroup combine specialist set my combine as follows. 1380 rotor rpm, 750 fan,concave 1/8th,top sieve 3/8th,bottom sieve 3/16. presieve I can't remember. spiked rethrasher. He suggested cover plates on first section to help clean up white caps and then pull wires to drop the grain out quickly. He wants 95 percent thrashed before hitting the seperation area. This was in Brandon wheat. He was happy with what he saw for grain loss on the ground and set the loss monitor 30-40 for rotor and sieve but set returns to 100. I only see returns doing weedy low spots. Since this is a new machine to I've just ran with these settings and haven't tried any more fine tuning.
 

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Way more fan speed. Try 950. If you did a kill stall you will find the whole top sieve covered. Might also have to open the bottom sieve to let more air through. But just try more fan speed first.
 

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Rotor speed wide open (1380-1400 rpm) depending on state of rotor - keep it max as it does not crack grain. Increase fan speed until you see tailings come up, then back it off until your tailings disappears. I believe we are up in the mid to high 800s. Do this in dry grain where you should not expect huge amount of tailings. Set lower sieve similarly. Watch the tailings come up - if it gets too tight, back it off to drop tailings. Recommend using cover plates on first section of concave. Depending on how sharp your rubbars are and what shape your concaves are, you may have to close it down to make a good job. I have never seen these combines crack grain. Generally use the concave to set the chaffer loss. If you grind up too much straw, you overload the sieve and create loss. As with your 8010, keep the presieve tight so only the size of kernels of grain can fall through directly to grain tank.

I have gone to an airfoil chaffer, plastic sieve combs. I couldn't keep a standard NH (or CASEIH) sieve in the system for more than 2 years without losing combs. These others are lighter in weight but are not as accurate to set. Watch for rocks stuck in combs that keep adjustments from occuring!

As soon as your original DSP wears out, buy the newer version with wear plates bolted to it. It is way more aggressive and you will find that you will not plug the DSP like you did before. It also speeds up threshing and minimizes rotor plugs.

I use the ACS (mode 1 and mode 2) to open up lower sieve in lower spots to decrease tailing overload and allow the puffies to fall in (call it candy!). Most times tailings overload comes from going up hills as well. I decrease fan speed to keep gravity from forcing grain into the tailings - I hate having to unplug tailings!
 

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I was told by our New Holland guy that you shouldn’t run the rotors at max speed (1400), your supposed to back off by 20 rpm to allow some cushion in the variable shive drive, it will have a tendency to blow out the seal if it takes slugs and there is not give.
 

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Discussion Starter #14 (Edited)
when I ran my fan at 950 I was finding I was blowing more out the back and my loss monitor agreed with what I saw in the catch pans, also it did not cleanup my sample noticeably. Once I backed it down to 800-850 this dropped the losses substantially but did not change the cleanliness of the sample. The part I cant figure is how I am getting the straws in the sample when I find virtually none in case hopper. Am I missing another spot that the straws might be coming from? In theory if they are not dropping through the bottom sieve or the presieve they should not be hitting the hopper.
 

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when I ran my fan at 950 I was finding I was blowing more out the back and my loss monitor agreed with what I saw in the catch pans, also it did not cleanup my sample noticeably. Once I backed it down to 800-850 this dropped the losses substantially but did not change the cleanliness of the sample. The part I cant figure is how I am getting the straws in the sample when I find virtually none in case hopper. Am I missing another spot that the straws might be coming from? In theory if they are not dropping through the bottom sieve or the presieve they should not be hitting the hopper.
My personal opinion is that threshing is more gentle in NH 22" rotor versus CIH 8010 30" rotor and so you will find more straw coming through. Never ran a flagship, only older combines. But what I saw is the 30" rotor (even worse with specialty rotor) was that it ground the straw up into powder form. Run rotor too fast and you crack grain with them as well. The proof in this for me was how often you have to clean the air filters! I clean the air cleaner once a season with the NH versus every other day with the CIH. I bought a 22" rotor for its design and never considered the smaller 17" rotors. In tough conditions where grain is not ready, you have a hard time getting the kernels out of the heads with smaller diameter rotors.

The best threshing combine I ever had with a single rotor was a 1460 (24 inch rotor). I think the new JD is going to steal the show with their 24 inch rotors versus the NH 22 inch rotors. It will be slightly more aggressive than a 22 inch rotor and will give them phenomenal throughput. They can utilize a wider feeder chain and remove frontal wear. I mentioned this in another thread that if NH came out with 24 inch rotors, they would have had a beast of a machine!

JD will have stolen the show from NH if they have designed a decent rethrasher and a good mechanical stone trap and strengthen the machine design to make it "industrial" so it becomes reliable. The weak link on NH IMO is the poor quality control and lightweight design which causes components to fail which should not. Fan brackets, Sieve hangers, gearbox mounts and miswelded components. Built too light.

I have never ran a JD before but would consider the new design to be an optimal design. Unfortunately I don't have the flat land or high yields to keep that machine happy......machine is designed for 100 bushels/acre or higher in small grains. I could never consider running a 50 foot table and over running it at 7.5 mph.

I never had a problem or replaced anything due to maxing rotor speed. In fact as rotor belt wears, your max rotor speed will fall from 1400 to 1380, that is unpreventable!
 
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The part I cant figure is how I am getting the straws in the sample when I find virtually none in case hopper. Am I missing another spot that the straws might be coming from? In theory if they are not dropping through the bottom sieve or the presieve they should not be hitting the hopper.
Drop your bottom auger covers and make sure the canvas separating the clean grain and return cross augers is intact
 

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You can see that canvas if you take out the circle cover above the clean grain auger on the left side of the machine. Just worked on a 8120 that had the left side rolled over. Metalwork was bent backward that the canvas bolts/rivets to. Canvas was tore. Put a bolt through the canvas and the side of the machine to get by. Haven't heard if it has affected the sample.

I'm running in 60 bu. durum now. CR970 Mad concaves .300 front .375 back. 1270 rotor (1300 is max) 5/16 clearance Top sieve is airfoil with rear curtains. Shaker in small grain position. Bottom at 5/16 Fan 810. Pre sieve 3rd notch. Don't remember what the actual measurement is. I've messed around with the fan the last couple fields. 880 sample is really clean but it throws over more and I can't travel as fast. 780 sieve loss barely reads. 810 seems happy medium. Some trash but they dock you anyway. I have some short straw like you describe but it's not enough to affect anything. I would try close the pre sieve a little more. I bet that is where it is getting through.
 

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Discussion Starter #20
I dont think its the presieve because as I mentioned it was the same open a notch or two as it was fully closed. Yes the dockage is minimal when delivered to elevator under a 1% but just looks bad relative to the case so was looking for an area that I might be missing given it is essentially the same cleaning system. I will take a look at the canvas that you and bob123 describe and see if that could be the culprit. Thanks
 
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