Internally there is a regulator with spring and spool. It is not adjustable with a screw. The pressure on old pumps is in the 600 to 650 psi range, and needed 30 wt to get there when new. Newer pumps can make 800 to 850psi, They are not going to like making 1000 PSI for very long. Fittings and valve balance detents and components will not be correct. If it is way out of specification, it is probably worn to the point that a good used pump will be needed. Shimming a pressure regulator is usually not a good idea. A replacement good spring OEM or equal is fine if the original spring is toast. The low pressure is almost never a function of the regulator, which will remain closed because the worn pump will not provide enough pressure to open it. If you need higher pressure, a Distributor driven pump will make 1200psi. (if the tractor is mid 1951 or newer, and has the mount spacing for the live pump). JimN
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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