The input shaft, which has a bearing on each, end turns. If the PTO is engaged some more stuff in the back is turning (which I assume not in this case). However, the oil slinger gear is also turning. It is geared to the top shaft and should free-turn on a bushing on the lower shaft. It may be the surce of the problem. The oil slinger is a light-weight die cast gear. If it started loosing teeth, it would get pretty loud. But the material is soft enough that it could get ground up. Once all the teeth are gone, it could quiet back down. Some ice around it could be enough to cause it to strip some teeth. If you pull off the top cover, which is no big deal on this model, you will be able to inspect the oil slinger and related parts.
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