As CNKS says, most likely the oil pump. Specifically the pot metal oil pump cover is warped. Common problem on this series of engines. Low cost fix if that is the problem. Drop the pan, remove the oil pump cover, check with a straight edge to see if it is warped. Get something very flat (piece of plate glass) 220 or so grit sand paper and sand the cover flat. Very thin paper gasket between oil pump body and cover may be blown. Only place I know of to get it is CIH. HTH.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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