Need more information. I gather we are talking the three point hitch? What implements and what are you doing with them. Very few three points have down pressure so there is nothing to keep it from raising if a force against the implement pushes it up. It should limit how far down the implement can go though, regulated by the position of the control lever. Some three point systems have draft control that react to forces and adjust the three point height. I'm not familiar with a TO and I don't know if that tractor has that feature or not. If it does, there should be another lever to turn that on or off and adjust its sensitivity. Will the three point hold the implement in the raised position, without settling down?
Kim