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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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