Hi All:
I can tell ya first hand how things go with this. After popping off the chrome OR Black cap, there is the dust cap that covers the spindle,nut,bearing etc. Pop out the rubber cap and there is a fitting to shoot the grease in. DON'T USE REGULAR CHASSIS GREASE !I had mine apart this past week,(because a Lippert employee didn't do his job right)! The grease is bluish ( appeare to be CASTROL ) WHEEL BEARING grease. It is High temperature grease for packing wheel bearings. I guess it can come in a tube for a grease gun. It might have to be an AIR powered gun because the grease is thick and I don't know if ya'll can pump a hand gun with that in it. I HAND packed my bearings on my last trailer.( the drums have to come off and seals pulled out and replaced after packing the bearings. ( There is a special way to do this by hand, You mechanics or car nuts will know how ).