Check the hydraulic oil temperature at the cooler in front of the radiator. If it is real high, that plus the AC might not allow enough cool air to keep the motor cool.
I would still be suspicious of the motor. It takes very little compression in the water jacket to make them overheat. Pulling the head does nothing if your sleeves/block are leaking compression.
Does the system seem to have a lot of pressure at the radiator cap???
Without more information on the hours on the tractor, whether it has ever been overhauled and the load your applying when it overheats I am just guessing.
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