In Reply to: Sherman power digger posted by Rick Joseph on February 05, 2022 at 08:22:02:
If you haven't seen it yet, there is an excellent library of info at this site.
At the top of the home page there is a red bar. ...Click on the "Manuals" tab, and it will bring the N-Tractor world of info to you.
Your PTO shaft will be 1-1/8" (original size) or 1-3/8" (replacement)diameter. ...You will need to find a pump to fit, or change the PTO shaft.
The Sherman 'hoe had its own reservoir, so there will be 2 hoses going to the pump - an inlet hose (suction) & discharge (pressure) hose. ...The suction hose will be larger in diameter.
The original pump on the Sherman was made by Hydreco. ....The tractor needed the Sherman auxiliary transmission (step-up or combo) to drive the PTO-mounted pump at a faster speed.
I have never been able to find GPM specs for the original pump.