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The axle hub is filled with grease until the grease forces the Bearing Buddy piston outward about 1/8 inch. Because the piston is spring loaded, the piston exerts a slight (3 psi) pressure against the grease, which maintains a slight pressure between the inside of the hub and the outside environment. When the hub is submerged, water cannot enter the hub because of this pressure. We recommend Kendall Super Blu Trailer Wheel Bearing Grease Tube for Trailer Hubs on Land Trailers, as the Super Blue blend is a high-temperature grease ideal for all types of land trailers. For Boat Trailers, we offer Kendall SHP Wheel Bearing Grease Tube for Trailer Hubs as an ideal marine grease.

An automatic pressure relief feature prevents over-filling and over pressurization. Without this feature, the inner seal will be damaged. Grease can be added to the hub through an easily accessible grease fitting located in the center of the piston. Lubricant level (and pressure) can be checked quickly by pressing on the edge of the movable piston.

If you can rock or move the piston, the hub is properly filled. Bearing Buddy will last the life of your trailer. The outer barrel is made of stainless steel. Internal Bearing Buddy parts are also made of stainless steel for maximum corrosion protection.

Bearing Buddy

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