The stalling sounds related to fuel or ignition and has nothing to do with the oil pressure. Check for spark when it dies, if you have spark look over the fuel system.
I've seen many H and M run with oil pressure barely registering on the gauge for many years. Low oil pressure can be caused by a bad relief spring in the pump, worn pump, or worn cam, rod, and main bearings. The general rule of thumb is 10 psi per 1000 rpm, so an H at 1750 rpm should have around 17 to 18 psi to survive.
If the engine isn't knocking or having at least a loud ticking sound, your oil pressure should be fine. In such a low rpm engine, volume is more important than pressure.
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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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