The most likely cause for you problem is hardening of the O-ring seal between the center section and the rear frame.
The oil passage between the filter and the MCV pump goes above the normal oil level where the two housings join together. With age the O-ring will harden and take a set so that it will not seal properly. Air enters the suction side of the pump and as the pump starts to get worn it no longer is as efficient at pumping air as a new one. Adding enough oil to ensure that this O-ring is below the oil level will keep air from entering the suction side of the pump and the symptoms will disappear.
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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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