Careful!
For 4 ply rear tires the YM195/YM240 manual says 23 psi MAXIMUM for an 8.3 x 24, 18 psi max for 9.5 or 11.2 x 24, and 14 psi max for 13.6 x 16. I suggest look up your tire sizes in Firestone or Goodyear's online charts.
I think on any tractor you want to air down until you begin to see some sidewall bulge. I am running oversize 12.4 x 24 rears, ballasted with water to about 11:00 position. On mine running 7 to 9 psi the bulge is unnoticeable until I raise an implement, then very slight.