I am assuming you are pushing dirt on the left side, what position on the dam are you in. I had this problem running on lowest setting. I adjusted the control box on the head to decrease the pressure and solved the problem.
Did you check it in both tires on each side or only one tire on each sideIJIJIJ Heh heh heh.......lOl BTW........did you use the "thumpn" technique or did you get all technical and use a gaugeIJ lOl ;-)
Actually I did use a guage as we are running 36 ft heads and the need for proper inflation is vital,,,I'm assuming that your operation is some kind of fly by night outfit,,,that doesn't care about running its equipment into the ground. lOl