Royce, if you can't find any info on that unit & have to go it on your own, then you might learn something by applying rotational forces to shafts & looking for flow paths to open & close (air pressure). From others I have seen, there may be a check valve in the line from pump to prevent back flow into pump output. If in yours, that might yield a clue.
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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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