I replaced seals on mine, but never could get the adjustment correct. I sent it to Larres Corporation, in Cambridge Minnesota for rebuild. They are good to do business with, and the P/S worked great afterwards.
I suggest you have a shop manual nearby if you decide to tackle the job yourself. I chased a front end pull on my 61 Starliner for a week. No front end adjustment I made would change it. Finally after reading the section on power steering I saw there was an adjustment on the control valve. The adjustment was no more than "pull the end cap off, turn the screw in until it bottoms then back it off 1/4 turn". Mine was turned in all the way. As small as backing out the adjustment screw 1/4 turn is, it fixed my pull. Car runs down the road straight now. Always good to have information handy when you need it.