there is a housing on the top of the box where the return hose connects , it can be slid up & down with the bolts loose this centers the steering & ifi ti si out of position it will turn the wheels to one end by itself But because yours will turn either way & doubt that has anything to do with the problem , sounds more like once the assist is triggered to either side it doesn't release , I would try flushing the system with new fluid , other than thatyou may need a now box in which case I would suggest Firm Feel stage 3 or Steer & Gear stage 3