To add to Mike's advice.
Make sure you buy grease that meets the manufacturers criteria.
Get the tire off of the ground and spin in while using the EZ Lube hub. That should help keep any grease within the hub and not be forced into the brake drum area.
Don' overfill. When you get new grease coming out from around the outside bearings, stop there. Wipe some of old grease out. Be careful, as the grease cap can have a sharp edge.
Never used an air-powered grease gun !!
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263