In 18.4-38 through 18.4-46 you can run up to I think 25 lbs if I am not mistaken. If you are talking about a floatation tire like a combine has then those have lower pressure, sometimes. I have 18.4-46 tires on my John Deere 8400 and with no duals I run 25 psi but with duals I run around 14 psi. If you have radial tires and the tractor starts loping while going down the road you need to add air.
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