Trailer hub is missing the cap and oil/grease is everywhere

[trayson]

Obviously this isn't right. Not sure what happened. If one of you can let me know what I need to do to fix this, it'd be appreciated.

I have the Vault maintenance free hubs:
http://i1070.photobucket.com/albums/u492/traysonh/Moomba%20XLV/20160724_182335_zpsxzkipgzs.jpg

one is missing a cap and grease is all over.
http://i1070.photobucket.com/albums/u492/traysonh/Moomba%20XLV/20160724_175646_zpsvjogtiir.jpg

http://i1070.photobucket.com/albums/u492/traysonh/Moomba%20XLV/20160724_175652_zps5ednje06.jpg

http://i1070.photobucket.com/albums/u492/traysonh/Moomba%20XLV/20160724_182345_zpshtn1z85e.jpg

[trayson]

I definitely lost the cap.

I have no idea how it happened though.

https://imageserv3.team-logic.com/mediaLibrary/159/vault_image_schematic_1.png

[Blazeshoe]

That grease gets hot and creates more pressure and pushes them out. Go get a new cap (bearing buddy). And then pull your bearings out and repack them. You could probably get away with putting the new cap on and pumping it up with a few squirts from a grease gun. But if it was mine I would actually pack them and put them back in. Then install the new cap and put a couple pumps in it and it should be good

[trayson]

No idea how long I've been rolling with them like this, as we just finished a road trip. It could be 8 hours or 8 minutes. No way to know.

[zabooda]

You lost the waterproof integrity of the cover and it was susceptible to dirt intrusion without the cover. Bearings need to checked and repacked periodically so this would be a good time to do that.