6620 bean chaffey setting

JD Seller had a great decription on how to set up for corn. Does anyone have any recommendations how to set the chaffer, cleaning sieve, and cylinder speed for beans?

Thanks

3/4 inch, 3/8 inch, 500 rpm. Get a manual. Ben

Well much of setting for soybeans will be the same as corn.

1) Set the cylinder/concave setting to where your getting whole beans with few splits. Caution split beans can be caused by HIGH cylinder speeds. So start with the cylinder speed under 600 RPM. !! Having a flat concave and level clearance is a must to thresh today's green stem soybeans without major splits/grinding.

2) Once your getting mostly whole soybeans then lets start to look at speed. You will need to look at the stems on top of the straw walkers to see if all the pods are off the stems. With the greener stem soybeans of today that can be harder. Speed the cylinder up to get them all off. Then check the pods going over the chaffer. You should be able to get all the mature beans out of the pods easily. Where it gets harder is the immature pods in the tops of stressed plants. They will have smaller beans and tougher pods. So getting 100% of them is usually not possible without splitting the mature beans. So adjust your cylinder speed up to help get more of them hulled.

3) You may have to tighten the cylinder spacing to get more of the immature pods hulled. This will cause more splits but your not docked too bad for splits. Just do not grind the larger beans. You will have to adjust your cylinder speed down in the afternoon when things get real dry and then speed it back up when they get tougher in the evenings.

4) Fan speed is easy in dry soybeans. WIDE OPEN. You will lose more beans with too LOW of a fan speed than you ever will with high speed on a JD 20 Series combine. It takes real immature soybeans that are small to get blown over the chaffer. Beans are round and fall out of the chaff easy.

5) Chaffer settings. I usually start out with 1/2 -5/8 of an inch settings. IF you have the long finger chaffer hold the spacing down towards 3/8-1/2. The longer slot will allow more beans to fall through so you do not need as wide of a setting. I will usually only tighten it down to reduce sieve over loading. Having the tailing elevator running 1/4-1/3 full is not going to hurt anything IF you need to. Usually in fairly clean soybeans you will not have much chaff to return.

6) Well if you want seed quality cleaning get a 3/8 screen to replace the sieve. LOL I have a set for my JD 6620 left over from the pre round up days. You can clean cockle burrs out of beans with them. I do not think you can even buy the screens anymore. So just set the sieve at 3/8 and you should be good. If your getting too many beans up the tailings then open the sieve a little bit. Just make sure they are coming over the sieve not the back of the chaffer.


You can get a good clean samples without too much trouble by fine tuning for conditions. Just pay attention.

In soybeans an AIR FOIL chaffer and sieve will really make getting a clean sample easier. If your chaffer or sieve is getting bad think about an AIR foil when your replace them.

I always close the bottom sieve, you will
return a little more but the beans will be
clean. My 7720 always gives me cleaner beans
then the 9500 or 9510 does.