I thought that the knob under the seat shut off the hydro to the 3pt. At least that's what the manual states and I do have a knob (rotating) under my seat.
Thanks for the input.
You are welcome and the knob under the seat is supposed to shut of the 3pt but mine doesn't work that way and haven't found out why or even a reason to use it either.
I cant comment why there are 2 devices that affect the 3pt but that lever you questioned on mine definitely stops my 3pt in place and the knob turned all the way in does nothing on mine anyway.
I suspect there was an auxiliary hydraulic attachment that could be installed that used the draft lever as its control but I could be off in right field on that theory my draft lever control block has a hose going out and back in so I believe that is where an auxiliary hydraulic could be run off of.