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International 5100 grain drill

D

Don656

Member
I have a Soybean Special 5100 grain drill. From what I can tell, what makes it a soybean special is that the normal 7-tooth grain feed shaft driven sprocket is replaced with a 14-tooth sprocket thus reducing the shaft speed by half.
To plant 180,000 seeds/acre, and using the sprocket ratios, I calculate that each flute of the seed spool must drop 6 or 7 seeds at a time. So, why did IH do this for soybeans? Wouldn't it have been more accurate to keep the original 7-tooth sprocket and drop 3 seeds at a time, rather than 6 or 7 at a time? If I change back to the 7-tooth sprocket will I increase the accuracy or am I missing something?
 
How do you limit the seed spools to picking up just 3 seeds at a time, though? You'd have to change them all to smaller flutes.

It's a lot easier to change 2 sprockets than it is 21 seed spools.
 
to sow lower rates. to choke the fluted feed down to 180000 per acre you would be sowing bean meal. cut the shaft speed in half and you don't grind the beans up.
 
to sow lower rates. to choke the fluted feed down to 180000 per acre you would be sowing bean meal. cut the shaft speed in half and you don't grind the beans up.
 
if i remember correct the soybean special had double disc openers and press wheels,as stated before if you drive the feed cups to fast the you will have to close then down to decrease seed output,if your seed count per pound is low say 2250 per lbs then the opening will be to small and crack the seed, where if there 3000 count they will flow thru ok,there are a couple of ways to adjust most drills to to get desired feed rates,one as you know is shaft speed to feed cup opening which has several variables depending on the different size sprockets that are available,also on some drills you can adjust the gates in front of the feed cup to help with seed size ,for instance you can open the gate one notch and it will allow the feed to be closed a little tighter for larger seed and help with the splitting problem or vice versa, even though the feeds are picking several seed at one time they will scatter apart as they fall through the seed tube unless your driving awfully slow,a little trial and error most of the time will let you find the combination that works best for what you planting
 
To limit the seed spools to picking up just 3 seeds at a time, wouldn't it just be a simple matter of moving the feed shifter lever? I normally have it set around 16 or 17, so couldn't I simply move it to about 8 which would reduce the exposed portion of the flute by a half?
 
Yes, the drill has double disc openers and press wheels. By moving the feed shifter lever to half of where I normally have it, wouldn't that cut the feed rate by half? The width of the flute would still be the same (only the exposed length would be cut in half), so why would that crack the seed?
 
I would only be changing the length of the exposed flute. Why would that grind up the seed? Because the shaft is rotating twice as fast?
 
it would crack the seeds because the setting of the fluted rolls would be too narrow to let a bean pass through at the low seeding rate. unless you were to block two out of threee runs and sow twentyone inch rows, if your drill is a seven inch model.
 
Thanks for the help! You probably saved me from cracking a lot of seed.
So, I guess it wouldn't be possible to cut the seeding rate in half to say 100,000 seeds/acre?
And what would be the smallest number you could set the feed lever to for soybeans?
 
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