Kind of a long shot, but my 4020 developed the pto no shut off problem a few years ago. The only way to stop the shaft was to slow idle the engine and pull back hard on the pto brake.
The problem finally showed itself this summer. The pto lever shook violently and a big noise from inside the bell housing. Found one of the 3 pto finger adjusting bolts had broken off just below the surface of the finger. This broken bolt head did not fall out at first, but cocked sideways holding that one finger partly engaged, causing the pto run on. finally it wore enough to fall out making all the noise and vibration.
I was able by working through the little access hole in the bottom of the bellhousing, to remove the finger with the adjusting bolt. Replaced the bolt and finger and adjusted it close to the others. PTO works like new again.
Late model 20 series tractors had larger finger bolts on the pto, so there was a problem with them breaking.
You could check for a broken finger bolt by doing a visual from the bottom hole, maybe poke them with a large long screwdriver to see if the head wiggles.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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