So now I'm ready to mount the chuck and try it out . . .
. . . . EXCEPT . . . I need to be sure of the hydraulics - a lot of power in that actuating cylinder. Operating force is tweakable by setting the hydraulic pressure, and I need to familiarise myself with the hydraulic manifold before I start random twiddling

The chuck says maximum operating force is 22 kNewtons ie 22,000 Newtons
Powering up the machine (no chuck fitted) lets me see that the current operating pressure is 30 bar, and the chart on the cabinet says this gives 4000 deca Newtons or 40,000 so presumably that pressure needs about halving.
Also I'm not sure how much tension that I can put on that 12 mm studding. It's only there to prove movement length and position, so I will turn the hydraulic pressure as low as I can for testing, then re-set it when I make the final adapter.
Have a hydraulic circuit diagram: