Help with floor jack, leaked and won't pump?

TrailBeast said

I have used trans fluid my entire life without one single problem.
It IS hydraulic oil after all, and really the only difference is that it has detergents and friction modifiers in it.
(for a smoother working jack with a cleaner interior) :D LOL

Click to expand...

When I rebuilt my old sears jack, my neighbor that does BIG hydraulic rams and used to do jack repair said use transmission fluid.

Find the leak on your jack and repair it. Some of the seals ar easy to get, others are more difficult.

Hiball over at this site is a really good guy.
Overseas Jack Rebuild Help Tutorial. - The Garage Journal Board