My 8N had a problem with the 3-point lift hydraulics.
If you had a load on them, mower or other heavy implement the minute you pushed in the clutch the lift arms would begin to drop.
Not a game ender but pretty easy to paint yourself into a corner with the brush hog.
I ordered the parts from this site and disassembled the lift cover and associated components and found the cylinder in reasonably good shape. I honed it with a brake hone and the finish came out good.
I installed the updated piston with the o-ring and assembled and adjusted per the instructions in the FO4 manual.
I hooked up the 5 foot brush hog and mowed for a bit and brought the tractor and mower into the shop and left the mower suspended.
Came back the next day and she was still in the same position! Small victory but it was my first try at tractor hydraulics.
Thanks to all who commented and helped.