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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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