Yes, you can easily remove the seals with a sharp point like a compass or jewellers screwdriver.. Sorry, but regardless of what the manufacturers say, I don't go for underfilling bearings. On electric motors, in the day when they had grease nipples, we would clean the nipple, remove a plug from the lower part of the bearing housing, and pump with grease to force out all the old grease, and keep poumping till new grease appeared at the plug hole. This meant that due to the design of the bearing housing, the bearing was 100% full. . Brook motors used SKF bearings, and these were fitted as new equipment. We never had a bearing failure unless the grease was the wrong grade, or contaminated. Some of the motors I rebuilt had done 35 years operating in the clean conditions of a powdered milk plant, and even after this extended life, which included daily maintenance, the bearings were still servicable. Less grease = more sales!! The sealed for life bearing usually has a life of 5 years or less!