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John Deere combine experts needed

N

NY 986

Well-known Member
On a 6620 combine I would like to improve my cleaning ability for soybeans. Should I look at an air foil chaeffer or a round hole sieve (bottom). Advantages and disadvantages to each? Air foil is about half the money of the round hole.
 
Don't forget that the first step in the cleaning process is at the concave/rasp bar area, if the concave has the edges dubbed off and the rasp bars are smooth the grain will not be set free to clean out good. We ran a 6620 till it was worn out twice, 8800 hours on it when it left (The mega dealer that took it in on trade "adjusted" the hours to 2800),,we used the adjustable chaffer, and changed rasp bars every year and concave every 2 years, it always seemed to do a good job,, it was a Side Hill so keeping the machine level helped a lot too..
 
I had the feeder house off last year and the concave was pretty square and I would say the rasp bars were at least 70% plus straight. The first field I was in yesterday the cleaning job was acceptable if not great. The second which I had to quit due to green material was trashy in the tank but not green trash. I have always thought my combine never did top level cleaning but was acceptable to good. I just want to do a better job and there had to be a reason Deere offered these other products to be installed.
 
I should point out that the beans are getting out of the pods from examining the material coming off the back.
 
A properly adjusted 6620 will sterilize beans. Like Tim mentioned, be sure there is complete threshing at the cylinder, but not overthreshing. The bean plant, in normal conditions, should look like you just hand shelled the beans out of the pods by hand with the plant mostly intact. Check this on top of the walkers. Open the top sieve the width of your index finger and set the bottom sieve about the width of your little finger. Check your tailings return for proper adjustment of the bottom sieve. Run enough air across the shoe to float the chaff without too much clean grain in the return and you should be very close. Set the combine to conditions, not always according to the book. Keep the loading auger in the tank in good shape so as to not overload the clean grain elevator. This should get you in the ball park. Mike
 
What is your fan speed? Don't be afraid to crank it up. You should be running at least 850 rpm and possibly more. Most folks run not enough air, see beans on the ground, and then turn down the air which only makes the situation worse. This is caused by the trash not being floated across the shoe but being sloughed off which carries grain with it. Most of the light chaff should never even touch the top sieve. Mike
 
And to add to all that Mike stated some times the cylinder speed is too fast, and shreds the fodder and hulls to where they over load the screens..We are not telling you or any one else what you already know,, just going over fine points...Combines are an amazing piece of equipment, and when we see one going 5MPH in 250 bushel corn with a "16 row" head.. it is even "more" amazing...
 
I'm not really a fan of air foil chaffers. The regular adjustable tooth chaffers and sieves do a good job in corn, beans, wheat, and milo. There are two different kinds of toothed chaffers, long finger for corn and bean machines and a short finger for small grain. Are you looking to clean up your grain tank sample or increase capacity? There's quite a few things you can do to a standard machine without spending a lot of $.
 
My Dad RIP ran a JD 95 and used the round hole screen/sieve and years after he was gone the elevator said Dad had the cleanest beans brought in. The is when the 6620's were new along with Gleaners and IH's bringing in beans. chris
 
I think a lot of my problem is consistency in the crop as it grew in the field. There is a lot of variability in soil types in most of the fields here. That affects things such as stem and pod plus seed size. Adjusting the chaeffer and sieve could be a full time job. I have had a couple of local combine repair guys sing the praises of the air foil plus it being effective on corn and beans. I have also had guys recommend the round hole sieve, too. A new round hole sieve is double the money of an air foil. Things are going to be late and if I could save time by not having to rotary screen I want to do it.
 
I don't know if a round hole sieve would work as efficiently in a crop with a lot of difference in seed size. But then, nothing will. A round hole sieve will always give the cleanest sample, they're just not as flexible in varying conditions. Do you have the rear of the chaffer in the top set of holes? Maybe if you can keep the crop in the machine longer, that would help. You could also drop the rear axle to the lowest position to raise the whole back end of the machine.
 
I agree with mike. Ran a 6620 T 2 for many years. More wind. Even the book settings are low on fan speed settings.
 
The fan is wide open. With the rain today I will double check the rubber shaker bushings, see if any bolts are loose or swing arms damaged.
 
I've been told an airfoil is not worth a d#@* in wet corn... by someone selling them. Hillsides were not there thing, either.

It's been almost 20 years since my stint in western NY, but I'm guessing wet corn is something you'll encounter there. I know there's a few hills too!

I hire someone to do my beans... I wish he worried about pods in the tank like you are. Trouble here was there were a few last week that were still too green to open. Those do get ripe in the bin.
 
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