I could easily be wrong, but from the pictures, it appears that there is oil leaking from your oil fill plug. (Or maybe the picture was taken immediately after topping it off)
Also, the hitch plate that originally came on that tractor is missing. The hitch plate helps distribute the clamping force of the bolts over the gasket sealing surfaces adjacent to the lower 3 bolts. A suggestion is to add a hitch plate (with the appropriate longer length bolts) without removing the cover, saving your oil, and it might help the leak issue.
Good Luck!
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