It's really no different than most other types of pumps. Basically the tolerance between the inner shaft and the tube it rotates in acts as a check valve, much like the tolerance between the gears and the sides of the housing do in a gear pump. From there, when the flat on the shaft passes the inlet port, head pressure from the oil tank forces oil into the cavity formed by the flat. As the shaft rotates the oil is carried around to the outlet port. In a pump like this the oil being moved isn't really being pressurized so much as is simply being conveyed from the tank to the outside. In any case, given the way liquids flow, when it reaches the outlet port, it is going to have a tendency to flow from it's container to the point of lowest resistance, which will be out the oiler tube and to the bar.
It's really a very simple setup when you get right down to it, but it works, and that's all that matters.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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