Posted by Mike Aylward on May 28, 2015 at 10:43:52 from (209.152.135.126):
In Reply to: Backup corn planter posted by Dave H (MI) on May 27, 2015 at 13:43:00:
Dave, like the others have said, you want one GOOD planter instead of two or more that are marginal. You simply can't have too good of a corn planter. Like has been said, you will buy a good corn planter one way or the other, whether you buy one outright, fix one up to good condition, or lose yield due to poor performance or untimely breakdowns. This being said, they will make replacement parts for your 7000 planter after we are all gone. There were so many made and still running that the parts are still in high demand.
JD's offer to you is a good one. The 7000 planter units can be made to consistently plant 99% or better with the proper parts and maintenance. (This is where a skip or a double is considered unsatisfactory. In other words, out of 1000 seeds planted the unit will plant accurately 990 of those 1000.) There are a few things you should do before you take your 7000 to the field. First of all, get a book. There are at least three different books for a planter your size, mostly due to the difference in the seed drive transmission. Next, at the very least, take apart the units and clean them out. Many of these never even have the seed taken out of them from one year to the next. You ALWAYS want to do this. While you have the units out replace the seed brush. This should be done every year as well, regardless of acres planted. It is such an important part (and inexpensive) that it's best to replace it often. Don't bet your corn crop on $30 worth of parts. There are not the only things to check but these are the most important and easiest to start with.
Depending on the seed size a regular 7000 unit will plant consistently around 96-98% accurately. The "sweet spot" for any finger pickup unit is a seed size of about 45-53 lbs. of seed per 80,000 kernel bag. Smaller size seed will double more where larger seed will skip more. Smaller than 40 lb. seed will double much more without modification to the unit. Seed larger than 60 lbs. will skip more as well. Also, a finger pickup unit does it's best work at speeds of around 5 m.p.h. or so. At about 30,000 population at 5 m.p.h. the finger pickup turns at about 65 revolutions per minute. In other words, more than a seed per second. In my observation and experience over the years the 65 r.p.m. is about the design limit of the finger pickup. They will still do a good job at this speed but fall off at faster speeds.
I apologize for the length of this post. I have worked on 7000 planters for many, many years and used to own a planter just like the one you bought. It served me well and I would still own it had I not wanted to update to a vacuum planter. With proper care they will still plant as good or better than some newer planters. I have worked on 7000 planters for many years and have rebuilt more finger pickup units than I could count. Like JD, I will open my email if you want to ask any questions. Feel free to contact me. Mike
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