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Talking with Shell tech' rep' some years ago he told me bearing grease never needs changing just to refresh the grease.
He commented, you can get more grit/dirt IN the bearing from messing with it that way shortening it's service life..
BTW...We don't have that service in Europe...seems it's an 'American' thing.
As long as seal is good and sufficient grease was loaded into the hub at assembly, that's it for life.
I tend to agree. I never touch wheel bearings unless to adjust them and then I clean the cap and reload it.
BTW...He said never use a graphite or Moly grease as these can cause the rollers/balls to skid.
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