Grease Zert for Sealed Bearings?

[Bruker 2]

I'm doing some maintenance on my father-in-laws Prestige and when I pulled the front wheels off I noticed the bearings are sealed but yet there's a grease zert in the wheel. Is this just to keep grease on the axle so it doesn't rust up?

[Killer_A-C 0]

They claim it is for ease of disassembly. Keeping everything in there greased keeps the parts from seazing up is the only thing I can figure.

[carbuff713 0]

The grease is also suppose to keep the moisture out -- mower arbors are the same way -- sealed bearings that last 500 hours. David