How to Rebuild a Ferroni MTI 25 PTO roller pump?

[Airdriver]

My pump works, but the seal of the PTO shaft leaks too much. I have never taken one of these pumps apart.

The only youtube is about rebuilding a "hydro" brand pump, which is straightforward IF you have the right tools and jigs to hold the pump and parts.

I don't.

Has anyone had one of these pumps apart?

Thanks in advance