Power steering adjustment to box?

On the top of the ps box there is a plate that has oil lines going into it. That plate is your adjustment. With car safely supported with front wheels off of the ground start the engine. If the wheel turns one way or the other on its own you need to adjust. The procedure is easy, loosen the plate on the top of the box and tap the plate side to side. You tap the plate slightly with the engine running and it will change which direction the centering of the power assist. I might not be explaining this very well, but it is in the service manuals which are available for download off of this site. The ps box was used for nearly 30 years and the procedures was the same for them all.