Before I would pull all the bearings out or look at them, I would pull the plate off of the bottom of the oil pump and see how worn that is. If the gears in the oil pump have much of any end play that's where you'll loose the pressure. You can put new bearings in or check the clearance on the old bearings but if your pump has too much clearance you just wasted all that time and money on bearings for nothing.
You just can't check one thing, you need to check everything in the oil circuit. I put together a Farmall H tractor and the bearings had 3.5 thousands clearance and the oil pressure is fine. I also checked the oil pump and had to resurface the bottom plate in the oil pump. I've got execellent oil pressure even after running an hour or more. Let us know what you find.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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