. Mark, does Cat have a web site for 12F Grader that lists what weight oil to use in control box, transmission, etc?Have you checked the oil level in the control box. the only way that shaft can move is if one of the cantering springs is broken on the control lever or the gears are binding up on the shaft ,you may need to pull the front of the box off and check it out
Mark
Thanks Mark for the fluids list.. Mark, does Cat have a web site for 12F Grader that lists what weight oil to use in control box, transmission, etc?