the filters you see on pumps is pressure side filter and generally do poorly in terms of efficiency. Beta is the typical term used for filter efficiency. A beta of 2 means that the filter is only catching half the particles of a given size. Pressure side filters with cellulose media typically have a beta of 3-4. If they would have put the filter on the suction side it's have a beta of at least 10 but very typically closer to 100 or even maybe 500. Dirty filters are more efficient but at the expense of pressure drop which is where your mileage drops are coming from. Hydraulic systems have filters typically downstream of all the pumps/valves, actuators and on the return to tank side.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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