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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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