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it is possible on some ball bearings to pry the covering off and clean and regrease them. At work we had a roller failing from seizing the bearings, the grease suitable for the application. As a field fix until the bearing situation could be rectified we cleaned them and filled them with Never-Seez. But is the risk worth it. How hard is it to get to the blower motor, some jobs you don't want to do twice.
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