I just googled Urethane Rubber coloring per comments on this thread and they use numerous colors in the molding. So you can't tell by the color. So as Jim said, go to the JD house and get the OEM and go from there. Course DR 90 is DR 90. Different rubber compounds could suffer deterioration over time but time doesn't seem to be the smoking gun. I'm thinking malfunctioning/mal adjusted pressure relief valve.
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