Tractor originally called for 303 oil that had a sperm whale oil base. And since that oil is no longer available, there are better, newer oils out there that met or exceed the 303 spec. Oil has come a long ways since the 303 oil spec.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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