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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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