Wonder if the check valve between the compressor and the tank is leaking back at higher pressures. A friend 40 years ago tried to put together a compressor from random parts. The check valve was missing from the tank he picked up and he didn't realize he needed one. The first problem he noticed was the motor slowed with each stroke once the pressure reached around 80 lb's and actually stalled the motor at a little over a hundred. It could not restart at cut on pressure. Granted this is an extreme case with no check valve but a leaky one could cause your problem I wound think. Not sure where the check valve is located on yours but if it is easy to get to unhook it at hi pressure unit shut off and do a soap bubble test on the valve.
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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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