Too many unknowns . If tractor is equipped with check valves you cannot release pressure when engine is shut down. Lot of tractors after about 1985 have check valves incorporated right in the valve. Older tractors usually had remote check valves. Newer yet often have electric controlled valves that require electric and hydraulic to relieve pressure so engine has to be running.
And like said, sitting in the sun will build a lot of pressure. If only happening on one particular cylinder regardless of machine it is hooked to, I would check for leaking cylinder by unhooking hose not holding up load and check if that tip develops pressure. Should be able to open that tip easily with no oil escaping.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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