Hi Elk, By the way - welcome to TBN. Hopefully someone with greater knowledge of your unit can help more. I think you have a bit of a tough nut to crack. I owned an Oliver for a short time - Oliver Cletrac OC-4 - produced around 1957-1960, I think. It took me quite a while but about the time I sold the unit I did find an owners manual. You need either an owners manual or better yet a parts manual to get an idea of the breakdown of that hydraulic cylinder. If its a leaking seal, which it probably is, there are web sites where replacements may be available or a parts manual may show you exactly whats needed so you can find a substitute or fabricate a seal yourself. Happy hunting & good luck.