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Sealed bearings ?

No! You force the grease out of the seals because the seals only normally seal one way .Keeps the dirt out lets the excess grease pass through . The only case I can think of over greasing a bearing deals with high speed superprecision bearings used in items such as CNC machinery .A chipper is...

In reading through all this it appears to be a classic case of a business man taking advantage about repairs from a person who has very little knowledge of what is involved in the process .It's an age old story .

The definition of grease is oil with a thickening agent often refered to as "Soap ".Certain things conditions within the lubs environment can alter if it works or not .For example you never use moly grease around saltwater because it sets up like concrete .That's the only thing I can think of at...

Hmm ,I wonder what is so special about that bearing to make it 400 bucks? Without seeing it I'd almost say the seals must have been faulty and failed to stop contamination from entering the bearing . As far as grease I suppose it's a personal preference but I'd say any premium quality grease...