This is what the original poster said.
[ I bought a wood splitter homemade 3 point tractor set up .]
Although he could adapt it for upside down cut and move the valve in the cab.
You would remove the valve (no need for it) & mount the splitter upside down on a quick attach plate, a 773 is a skid loader, not a tractor. I have a homemade 3 point I built 30+ years ago I did this to.