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SW Minnesota | My 9400 JD combine has the factory straw chopper on it. Most of the time it does a pretty good job but there were a few bean varieties last year that it wasn't able to chop up as well as I'd like. Last spring I had trouble in those fields with bean straw bunching up in the soil finisher. Does anyone make some aftermarket parts for the factory chopper that help with chopping the bean straw finer, such as sharpened hammers, etc? I know I could put a Redikop chopper on it but that gets kinda spendy and I've been told that it's not the best idea to use one of those choppers in corn. Any ideas? |
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Northern Alabama | jd-tom...just a question, are you running the chopper on high speed pulley? still learning my 9400... |
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Middlesex County, Ontario | Look at the chopper knives. 90% of the time the center knives are very worn while the outside looks new. Axial flow combines have two little plates you can angle to change where the straw hits the chopper. You want the straw to hit the full face of the chopper. The JD has something similar but I can't remember what exactly. By adjusting this you are letting the whole chopper do the work instead of half the chopper doing the work. Its a trial and error process getting it set right. Easiest is to spray paint the knives and check every couple rounds to see where the paint is wearing fastest.
This adjustment should help with spreading the straw evenly as well. When straw comes out of the chopper along its entire length it falls more evenly onto the spreaders.
If you are going to change/sharpen knives don't forget the stationary knives.
I just hate seeing a bean field with 20' straw windrows spaced 30' apart. |
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WC Saskatchewan | Many 9600 and 10 series combines were upgraded to a MAV chopper rotor. It was a kit and involved removing chopper shaft and replacing with theirs. Made a heck of a difference and there was no problem spreading 36'. And it actually chopped the straw. Took a little more hp to run over stock. Was by far the best upgrade we ever did to our 9610. I am sure they would make something for 9400's. |
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WC Saskatchewan | http://www.strawchopper.com/john-deere-straw-chopper-econo/ |
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NW Washington | Here is a link to an old NAT thread on this subject that might help. http://talk.newagtalk.com/forums/thread-view.asp?tid=115609&Display... |
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North of Iowa | The standard chopper on a 9000 series combine, even with new parts will only do a fair job of chopping. I would suggest after market parts or chopper to improve. |
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sw corner ia. | I have the mav on my 9500 as well. now it chops and actually spreads as far as you want. |
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| Fine chop rotor from TSR http://www.tsrparts.com/ Installed a fine chop rotor and new style knife bar in my 6620. You can see more pictures and info about it at the link below. It's image intensive so be patient. You will need to scroll down the page to the section about the rotor and knife bar. http://agtalkplus.com/?q=node/1364 |
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central Ia | How much HP do the replacement chopper use, I have a 1990 9400 so it has the small engine. I would like to upgrade but afraid it won't have enough HP to pull the chopper |
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| 6620 has the turbo'd 466 in it and quite honestly I can't tell that much difference in power required. With the sharpened knives and more rotating inertia giving a slight flywheel effect it can't require much more than a blunt chopper hammer trying to cut things. Sort of like mowing grass sharpened blades cut more easily and take less power than dull blades. I suppose if you are running a larger platform or pushing ground speed you may see more of a power requirement difference. |
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| There was an upgrade to the knife bar probably 10 years ago. It replaced the original sickle sections with a knife that looks more like a knife on a a moco..only much longer. It went in closer to the rotor, and it wasn't beveled anymore. This made quite a difference on ours, and it didn't break the bank...FWIW |
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| TSR sells those as well.
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68340 | I have an after factory spinner on mine to spread the fines that come off the sive. You need one of those. |
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SW Minnesota | Yes I am - high speed for soybeans and low for corn. |
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SW Minnesota | I have one of these on my combine already (we bought the machine used and it came with it). So this stationary knife setup wasn't OEM on the 9400? |
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| what von posted is what i was referring to.. ours was an early, and it had a sickle section looking thing in there without the serated edges. this worked far better, but compared to the new combines, not so good. always thought of trying to speed the chopper up, but instead just lived with it....good luck |
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| I thought this type was referred to as a 9000 series knife bar. It is a huge improvement over the sickle section type that was on my 6620. Not sure if all 9000 machines came that way or there was a serial number break where some had sickle sections and others had updated bar. What sort of hammers are on your current rotor blunt type or sharpened ones ? This is the updated rotor I installed from TSR with sharpened knives.
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68340 | I have a 20 ft head and when I cut beans it almost spread the chopped beans and chafting 20 ft. Maybe on 18 ft wide. I have no trouble planting into a bean field next year using Dawn trash wheels to move a little residue if I want.
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Missouri | Von WC Ohio - 9/5/2013 11:06
I thought this type was referred to as a 9000 series knife bar. It is a huge improvement over the sickle section type that was on my 6620. Not sure if all 9000 machines came that way or there was a serial number break where some had sickle sections and others had updated bar. What sort of hammers are on your current rotor blunt type or sharpened ones ? This is the updated rotor I installed from TSR with sharpened knives.
1990 (second year) model 9400 had the "sickle section" style knives. It was not much of a chopper. |
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Missouri | Von WC Ohio - 9/5/2013 06:06
6620 has the turbo'd 466 in it and quite honestly I can't tell that much difference in power required.
That turbo'ed 466 is 28% more motor than the turbo'ed 359 in the early 9400's. That 466 will sooner have power to spare than a 359. |
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Any way to make the chopper on a 9400 Deere do a better job?
