My log splitter just lost it's hydraulic force. I don't see a fluid leak, what else could be causing this?

Could be low on oil????

I put hydraulic fluid in before this happened. How does power transfer from the engine to the hydraulic mechanism? there is a rotor from the engine that is aligned perpendicular to the path of the ram & another rotor facing it that is attached to the hydraulic side & a gap between them. Something wrong/missing there? I don't know if it is different now than when the
ram was working fine.

Thanks

Glenn

That is called a Coupling, In your case a Pump/Motor Coupling and has some sort of Rubber or Fiber element in between the two parts that cause them yo be conected somewhat loosely so some slight mis-alignment between the two connecting shafts do not cause the weaker shaft to be damaged.

If you can find wrecked parts laying around the last place it worked you might be able to see the debris.

You can take the two parts to any place that sells electrical equipment and they can fix you up with what you need. Also many automotive supply houses carry such items.

Bud,
I think you hit the nail on the head. I did find a metal "tooth" that looks like the one still attached to the rotor on the hydraulic side & two rough spots on the rotor where it looks like these "teeth" were once attached. I find no sign of the rubber/fiber element but it must have been there.
Thanks for the reply

Glenn

It sounds like your isolator or "spider" had fallen apart, then couplers were whacking their teeth off each other, shearing them off on one side (my guess is the pump side).