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Hello,
As a standard practice the front hub (comes as one piece) in the 900 series is not to be regreased. And the lock nut is for one time use only. New hub comes with new lock nut. I replaced my original front hubs at 910k km with Optimal brand which comes with new lock nut.
With that being said the old hub did separate into two halves when I tried to pull it out of the front spindle. This exposed the inner bearings. I guess this is where you could re-grease back the bearings but putting it back together (mating it back) is difficult. I had to use a large hammer to knock it back together (might had scored bearing and race too). So re-greasing is impractical. Easier to replace with new.
Amarin
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