Next, take a pair of channel locks and remove the cap. You may need to twist it off as some are threaded or you will just need to gently wiggle it back and forth until it comes loose. You should have a tray or bucket close bye to put all of the parts. They need to stay clean especially the interior parts such as the bearings, seals and cap.
On this hub there is a metal ring seal. All you will do with this is clean it and lightly grease it before replacing the hub.
Find a hammer that will fit in the socket and place the wooden end of the handle in the hole. Hit firmly, but don’t overpower it. It will probably take a few hits to get it out. Make sure that you place the hub on a clean surface so the seal and bearing stay clean.
Place the bearing in the packer and screw on the top. Make sure there is a good seal around the top and bottom edges of the bearning.
Attached the grease gun and pump the handle until all of the dirty grease is pushed out of the bearning and clean grease is coming through.
Use some of the extra grease and coat the outside of the bearing. Also lube lube the bearning seat pictured below.
Now, replace the hub. Make sure that any seals or sleeves the you took off are replaced before installing the hub. When the hub is back in place. Lube the outer bearing seat and replace that bearning. Replace the bolt, cotter pin & cap. Your done!