Here are the seeding charts, well click on my hotlink is easier.
http://talk.newagtalk.com/forums/thread-view.asp?tid=554126&mid=4554901#M4554901
Use that set of gears, the transmission, to switch seeding rates as the other fella pictured.
Older 7000 planters had the double length chain links and had a 7, 9, 11, etc sprockets.
Newer 7000 planters had regular chain links and sprockets of 14, 18, 22, etc.
You need to possibly double or cut in half the sprocket tooth count to make a new or old manual work with an old or new planter.
Shoup is a great company to get JD 7000 planter parts from, they offer better service and cheaper parts than most of the new mega JD
dealerships any more. They have a special sprocket that will let your planter run 1/2 of normal seed rate, you might want that. They are on line,
look them up.
I would -highly- recommend getting a JD 7000/ 7100 planter manual. (Same planter, the 7100 is a 3pt, the 7000 is on wheels and a hitch.) it is
very very good to have a planter manual. They are all over, dealers, eBay, etc.
Paul
7000 seeding charts