On my old to35 that leaks a little oil from the front of the transmission shaft.
With lift arms in the up position,so cylinder is full of oil, I never fill the transmission/hydraulic sump over 1/2 way on the dip stick. Or to the center line.
So far this method has worked well.
My up side down cotter key finally broke off last year so I check that drain hole in the bottom of the <
>trans housing each time I fuel the tractor.
Does any one know if you can replace the up side down cotter key with out splitting the tractor???