I recently had the same problem with an H Farmall.
I dropped the pan and plastigauged the bearings. They were within specs. I then turned to the oil pump.
The pump didn't show any wear, but I drew a flat file across the cover plate and found some high and low spots. I drew the flat file across both the cover plate and main body until there were no more highs or lows. Then assembled it with a couple of flat washers under the spring in the relief valve. I now have acceptable oil pressure, although still not as high as my other H or my M.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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