Keep an eye on the inspection hole in the bottom. If the seals for the PTO leak, the transmission fluid will come out there. If it does leak, the tractor will need to be split to fix the leaks in the PTO area. If your hydraulic fluid is working its way into the rear end, then either the hydraulic pump seal is leaking, or the steel pan that separates the hydraulics from the transmission has a hole rusted in it. Either one of those problems require the hydraulic/three point cover unit to be lifted off for repair.

The Super 55 and 550 were excellent tractors, but are also 50 to 60 years old. Let us know how it goes and we'll do our best to help out.