I am working on a Casec1965 530ck, with the 2 cylinder set up. The issue it has when you turn all the way to the left to the stop it over pressures and kicks the steering wheel back violently and if hand or fingers in wrong place it can be painful. Turing to the right has no problem, you can turn to the stop and hold it as long as you wish. I am thinking a relief valve issue, but am not sure and can't seem to find good repair information. Thank you in advance for any help you can provide.