When you say "a little while of running" do you mean while actually running or is it just a problem over a period of time?
If you can get parts, they are easy. It is nearly always the seal on the shaft between the primary pump and main pump body. The MD has a packing type seal that is long gone from the shelves. If the 400 has the B pump (with IH on the top cover) it will have a modern seal, although only available through IH.
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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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