Not exactly the same, but I just rebuilt my Seastar hydraulic ram. It was pretty easy, considering I've never done it before. The instructions with the seal kit were OK, good enough to get someone with middle of the road skills (like me) through it. The worst part was when I was disassembling and slid the shaft in...it puked hydraulic fluid all over me.
I did have a very small rub, not rough enough to call scoring, very near one end of the shaft. I put that spot on a felt wheel on the bench grinder and it came smooth. I may foul up the new seals, but a new ram is around $700 and the seal kit was around $30, so I figure it is worth trying. Plus I learned how to rebuild one.
It's not leaking so far.