hi everyone, I just got a 12 hydrostatic, got it running today and the hydro seems weak. I found the bypass valve under the seat, should it be screwed all the way in or out? also I seen pics of hydros with the hydraulic tank under the seat, mine does not have that. is this and early or late model thing, or did previous owners remove the tank and not reinstall? the tractor is painted nice, I don't really have to do anything for a restore!