When grease is pumped into the bearing protector using a grease gun, the spring-loaded piston will move outward to indicate when to stop filling. Due to the constant pressure provided by this piston feature, there is nowhere for water and debris to go when the hubs are submerged, ensuring a longer bearing life.
Before using bearing protectors for the first time, we suggest that you do a complete inspection of your hubs and all of its components. You will want to remove the hubs and check both bearings, races, and seals. You will want to look for pitting, rust, or anything that look suspicious. Check the seals for dry-rot. If you are unsure, it is best to simply replace the seals. Clean the hubs and all components of all the old grease.
When purchasing bearing protectors, it is suggested that you also purchase a cover. The cover slips over the protector and keeps any grease that is expelled from the protector during from getting all over your tires, wheels, or trailer.
The posi-lube cap has a removable rubber plug that when “popped”
out allows for access to the zerk fitting without having to remove
the cap each time.