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Perfectlap, you would only get more contamination from a dual-row bearing if it is failing - something it does much less often than a single-row (less than 1% versus 8-10%). Nevertheless, you and Homeboy make a strong case for replacing the single-row bearing as a prophylactic measure.
Perfectlap also makes a good point regarding the use of a replacement factory bearing, especially for the dual-row. While LN produce a ceramic dual-row bearing, which at least in theory (and I suspect in reality) is an upgrade, the Pelican parts 'upgraded' bearing for the dual-row is actually a single-row with a spacer. In otherwords, you are downgrading from dual to a single row with its much higher likelihood of failure. Rather than use it, surely it makes sense to replace with the factory original part which has proven to be quite reliable over a large number of years (the last of the dual-rows was manufactured some 12 years ago and yet less than 1% have failed).
Brad
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Threaded Mode
