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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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