The early pumps had no provision for adjusting the end clearance of the gears. Those pumps were good for about 400 psi. Later pumps had a thinner center section and added shims to adjust the clearance which allowed higher pressure, about 750 psi. If the pump assembly is in good shape it is possible to shim the relief valve spring to get a little higher pressure.
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Today's Featured Article - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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