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Quote:
Originally Posted by Willie Krash
It's a ball bearing, you shouldn't need too.
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Depends on the quality of the bearing, some have no seals, some have ceramic seals, some have a rubber/vinyl type seal. On poorly seal bearings the lube part of the grease escapes, the grease hardens and the bearing goes bad.
The really bad ones actually have a shelf life, if they sit unused the lubricant separates/seeps out of the bearing and sits in the bottom of the container they are stored in. I have seen this happen where I worked when they did not rotate stock for a couple of years and some bearings were out of box 2-3 years old