Does Redline Trailer Bearing Grease Seal # 29031 Include a Spring

Question:

does this seal have the inner spring in it as mine does. cant tell by picture. thanks.1950 parkhurst trailer 5200 lbs axle 3inch o/d x 1.86 inch axle seal o/d on axle x .50inch thick 1/2inch 6 bolt hub

asked by: Dave

Expert Reply:

The Redline Trailer Bearing Grease Seal # 29031 that you referenced does not include a spring. This single-lip seal is for use in the inside end of a trailer hub (the side closest to the axle and furthest from the spindle).

I think the part with a spring that you are referring to is a special type of outer grease cap (not an inner grease seal) called a Bearing Buddy. These mount on the outside end of the trailer hub/spindle in place of a standard closed grease cap. They hold a supply of grease that is forced into the hub when needed by the spring pressure.

Bearing Buddies can be selected by precisely measuring the hub bore with a digital caliper, then matching the Bearing Buddy by its matching outer diameter. The link provided will take you to our main page for all sizes; you can select a set based on your measured hub bore. For example, part # BB1810 fits a hub bore of 1.810 inches. The linked article on bearings may be helpful.

expert reply by: Adam R