Part of my answer is, it depends. The tractors we use in the field are mostly equipped with radial ply tires. When used in the field for tillage, I try to follow the recommended pressures based upon the load, or weight carried, on the tires, as well as maximum speed. On our large tractor, with 18.4 x 46 radial tires, the per tire load amounts to about 4000 pounds per tire since this tractor has duals. I am running around 12 psi in those tires, whereas the 14.9 x 30 radial on the mfwd require 28 psi. If running singles on the rear, then the pressure needs to be higher, but I cannot recall off the top of my head what it should be. The 2 wd tractor used for planting and planting is set up with duals, but these come off when hauling grain in the fall or chopping stalks. I think we might pump the singles up to somewhere around 20 to 24 psi. On the tractor with bias ply tires, they are not used for pulling heavy draft implements in the field. We run those a bit higher simply because, as I recall, bias ply tires are not designed to run with lower inflation pressures. Our "classic" tractors run with bias ply tires and they are pumped up similarly to our other tractors with bias ply tires. Again, for actual use, I tend to follow the recommended inflation pressures from the manufacturers based on the weight/load on the tire and the ground speeds I will be running.
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