Originally Posted by
KPREN
Fortunately, it is very easy to pop the seals out of a sealed cartridge bearing, wash wash the bearing out, repack them with grease, pop the seals back in and get more miles out of them
The whole idea behind cartridge bearings is to avoid having to repack them. That's why most people choose them so that they don't have to mess around maintaining them. If a cartridge bearing wears out you just replace the whole unit.