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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