Does it have other hydraulic components such as implement cylinder remotes? If so, if you activate one of those levers (dead head) does the system apply pressure and load the engine? If yes then I would suspect somehow some trash got into the 3 point control valve. If no loading then the pump possibly did not reprime. If this is the case don't run the engine extensively until the issue is resolved you could ruin the hyd. pump. Sometimes placing air pressure on the hyd resivoir (3-5 psi i.e. a rag wrapped around an air blower stuck in the fill hole even if it is the gear case) while it is running may help. It may even require loosening the suction line at the pump while applying the air pressure. Just my experience from a similar problem I had with a 2010 Ford utility tractor. In that case the gear case was the resivoir and the hyd.pump was up on the engine.
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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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