Tire pressure varies with the load and field conditions. The pressure on the tire is to support it at a given weight load generally at the max. You want the pressure as low as possible to keep the tire on rim for max traction. Slightly higher if you run it a lot on the road or hard ground
On the plow tractor with a big rollover plow we'd run close to 18 with loaded tires. But that was a lot of weight on the rear tires and they squatted down when the plow was lifted
With out the plow mid to lower teens. I could tell by how the tire sat and impression it left.
Your JD is a light tractor compaired to a big plow tractor so low teens is probable ok . Tires have a load rating and a loading chart. So one tire might need 16 and a higher load range tire (number of ply is also an indicator) on the same tractor beaver might only need 14.
For my little kubota I run 12.
If your uncomfortable trying to figure it out just talk to your dealor
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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