So your three point only has all the way up or all the way down. In otherwords if you move the lever to some midpoint position, the hitch still goes all the way up (or down if that is the way you last moved the lever)
If the load shaft was removed to fix leaks,(common to do) the cam feed back roller may have snapped out of the feed back link. The hitch will not stop in mid range since there isn't any feedback for rockshaft position.
The slowly leaking down could be due to the thermal relief, raise/lower balls not seating, or rockshaft piston packing leaking.
Can't remember if the 4020 had a surge valve or not. It's ball could be not seating properly.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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