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The dual rows are overkill and because of the additional load carrying capacity,
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Let's remember that statement for a later date... I certainly concur with that statement, and I believe in overkill.
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can tolerate poor lubrication over a much longer time.
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None of the bearings that we have analyzed or have had analyzed show any signs of a lack of lubrication. It takes catching bearings at all the stages of failure, then analyzing them to gather this data, which takes years to accomplish.
Since 2007 we've known these issues were not related lubrication.