JD 7000 seed opener verse fertilizer opener hubs

andy r · Feb 29, 2020

I have some used JD 7000 planting unit double disk openers that I am considering putting on the JD 7000 double disk fertilizer openers. The bearing fits perfectly. Yes, I know the opener blade diameter will have to be worn down or machined down enough to fit. Always wondered why the John Deere double disk openers on the fertilizer units used the thick cast hub and the openers on the seed units used the thinner pressed hub. Primary reason might be that the fertilizer openers would loose their dust caps working so close to the ground if using ones similar to the seed openers. Also, possibly since the fertilizer opener might be running deeper, the thicker cast hub may provide more support to the opener and not flex like the thinner pressed hub. I have seen worn seed openers on the fertilizer units before and they seem to work fine. Any thoughts other than the two that I can come up with? Thanks.

caterpillar guy · Feb 29, 2020

I can't speak for the hub difference. I can say 30 years ago I took old seed disks. That were so small for there and moved to fertilizer openers by putting a bolt through the hole, tighten a nut down and spin them in the drill press. Then with a disc grinder cut them to the right size. Ones just a bit big I would turn down sort of like in a lathe, the bigger ones I would part off like parting off in a lathe. Saved grinding time. A cutting wheel would cut easier than a grinding wheel will.

JD 7000 seed opener verse fertilizer opener hubs

andy r

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caterpillar guy

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