As long as you have the pan off and some are telling you to check the end clearance on oil pump gears, check the shaft in pump. You can grab a hold of the gear and see if it moves side to side. Or put a feeler gauge between gear and body, no more than 6 or 7 thousands clearance for good hot oil pressure. The H and M were kind of hard on the oil pump drive shaft, have replaced a lot of them over the years.Luckily the housing is normally not worn or not enough to bother. Then take a look at the pressure relief valve plunger. If it has a step on the end you have wrong one which was supplied for a number of years, will also have lower full throttle oil pressure and low at low idle speed. I have found several of them over the years, in my own H also. I have replaced a lot of cam bearing on H tractors but never really saw one bad enough to cause oil pressure problems. Just routine replacement to get all clearances up to specs. Should have about 70 psi at high rpm.
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