Ok keep these statements in mind. The rates are the same it just depends on the type of chain you have. You have the longer link chain and the decals on your planter show the lower number teeth sprockets. paul the original - 3/12/2016 06:59 Settings are all the same. Only difference is the number of teeth on the sprockets. If it says use the 22 tooth sprocket, that is for the regular links. The older planters like my 4 row have that double length chain, so I would be counting an 11 tooth sprocket. 11 tooth sprocket = 22 tooth sprocket. 7 tooth sprocket = 14 tooth sprocket. And so forth. Just divide by two on the number of teeth on the sprockets to use the chart. Or if you have an old chart with a newer set of sprockets, you'd have to double the tooth count. My 6 row has the regular chain links, the 4 row had the long links. I'm not sure I'm making this easier, its easy to do, but I'm stumbling on keeping it a simple explanation..... 11 = 22 7 = 14 9 = 18 Etc. Paul And Gerald J. - 3/12/2016 13:52 The 2x applies ONLY to the sprocket teeth, NOT the seed rate. In the early planters with 2040 chain (long pitch exactly twice that of 40 chain and 2040 chain fits 40 sprockets perfectly, just not the other way around) the sprockets were 7, 8, 11, 13, and 15 tooth drivers and 7, 9, 11, 13 and 14 driven. Giving ratios of 1:2 through 2.14:1. with 7 driver and 14 driven through 15 driver and 7 driven. The later planters with 40 chains used 14, 16, 22, 26, and 30 drivers with 14, 18, 22, 26, and 28 driven giving the exact same ratios and seeding rates. The chains are the exact lengths and the sprockets the same pitch diameters. I presume 2040 chain was enough cheaper to pay for the more custom made sprockets in 1970. Gerald J. So from this link https://www.joharrissales.com/assets/Uploads/PDFs/PlantingCharts/FPU-Chart.pdf We can look at 36" rows and we see 2 populations that are close to your 30,0000 desired rate. a 31,500 rate and a 29,700 rate. Follow those across to the sprocket combinations all circled in red. 
Now this chart is printed for the newer regular length chain and sprockets. In this case 29,700 uses the 30 Driver (bottom shaft) and 22 Driven (top shaft) circled in blue 31,500 uses the 26 Driver (bottom shaft) and 18 Driven (top shaft) circled in red. 
Since you have the large tooth sprockets and longer link chains. You simply cut these chart numbers in half and use this sticker which is what is on your planter. Notice the sprockets used are in the same location using either chart. So in this case we have. 29,700 uses the 15 Driver (bottom shaft) and 11 Driven (top shaft) circled in blue 31,500 uses the 13 Driver (bottom shaft) and 9 Driven (top shaft) circled in red. 
Very important to keep straight the driver/driven locations clear in your mind when setting. You simply remove or add the rubber spacers on both shafts to get the correct sprockets lined up with the double idlers. I hope the illustrations make it more clear on how to use the charts and how to set the sprockets. | 
7000 planter
