setting my John Deere 494a

I'm new to the 494a John Deere planter. I am using it to plant sweet corn. I using 16 cell plates, 30 inch rows and wanting around 20,000 population. Can anyone tell me the sprockets on the shafts that I need to use to get the population I want? Thank you
 
It has been 45 years since I used a 494A. Didn't think there were any left on the planet. What does the manual tell you??? You do have a manual?!? If not, find one....
 
Are you sure it will go to 30" rows, Mine wont because the planter boxes are too big around. Some of the guys converted them to 6 row 30" in the early 1960's by lengthening the frame and using 490 style boxes on 2 of the rows.
 

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