I have recently purchased a 1970 140 H3 (-10,000) and i have seemed to develop a question that i have yet to find a solid answer to. This is the first tractor i have had that uses transmission fluid for the hydraulics as well. After changing out all the fluids i cant determine if its best to top off the fluid with all the attachments in down position (i have 3 point hitch and mower deck attached right now) or with the everything up. It seems to make a big difference in fluid level between the two and i dont want to work this thing hard without the right level of fluid. I assume if i filled too much it would be slow to go down due to back pressure and such but its hard to tell with just these attachments. Advice?!