Have you verified that the engine coolant is actually that hot? (And I'm not sure 220 is TOO hot if the tractor, AC, and hydraulics are all being worked on a HOT day.)
Would be good to take an infra-red temp gun and check engine block temp as well as rear end (hydraulic oil) temp.
As JD asked, any chance the cooling system is being pressurized by a leak that allows combustion byproducts into the cooling system?
Is it a syncro or a power shift? Each has an entirely different PTO system, and although I am not making a connection between the engine running warm and either PTO system whining, there MAY be a connection that a real EXPERT may point out.
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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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