GRAIN DRILL TIRE SIZE
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=137668
Printed Date: 25 Apr 2025 at 4:36am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: GRAIN DRILL TIRE SIZE
Posted By: FREEDGUY
Subject: GRAIN DRILL TIRE SIZE
Date Posted: 22 Apr 2017 at 11:08pm
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I am not a tire expert so bare with me. We have an International 510 drill (sorry) that has 3 different tire specs in the manual. 1 of them is a 7.50x20 truck tire. Ours has truck tires but they are 8.25x20. Will this difference in numbers effect the popualtion settings ? Thanks
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Replies:
Posted By: Dakota Dave
Date Posted: 22 Apr 2017 at 11:24pm
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Aren't the seed cups driven from the packer wheels? On the JD the tires just hold up the planter and are used to lift the opener disks out of the ground. The drive chains run back to the packer wheels. If I rember correctly a 8.25 in a couple inches taller than a 7.50 that's about 10 inches differant in circumference. That's almost 10% difference.
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Posted By: Dans 7080
Date Posted: 22 Apr 2017 at 11:28pm
7.50-20 are 37.7" tall and 8.25-20s are 39.3" tall so the short answer is yes but I doubt it would be enough to know. The 7.50 is 551 revolutions per mile and the 8.25 is 529 revolutions per mile. If you could figure how many seeds it drops in one revolution you could adjust accordingly if you want to pin point the population.
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When someone tells you Nothings Impossible, Tell them to slam a revolving door
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Posted By: FREEDGUY
Date Posted: 22 Apr 2017 at 11:41pm
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Thanks guys , and Dakota, the drives on this unit are from the end wheels via a clutch mechanism like a JD 7000 planter.
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