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How to Pick Out Replacement Trailer Grease Seal and How to Install Grease in Hub with Bearing Buddy

Question:

I purchased Bearing Buddy trailer wheel bearing protectors model 2047 from you guys for my Harborfreight trailer. I have some inner grease seals leaking. which inner seals do I need?

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Expert Reply:

A common problem we hear with people with Bearing Buddies is that since it is so easy to add grease to the hub that they end up putting too much in and blowing out the grease seal.

Replacing the seal would not be too hard, but we first would need to determine what seal you would need. To do that you will need to pull the hub and measure the inner diameter of the hub where the seal installs and then measure the outer diameter of the spindle where the seal rides. You will want to use a digital or dial caliper to take this measurement.

Once you know what you have follow the link I attached and select your inner and outer dimensions from the filters and the correct seals will be listed.

The zerk fitting where you insert the grease is sitting on a spring loaded disc or piston that will move outward away from the hub as grease is added. Push on the edge of the piston with your finger. If the disc doesn't move, add grease until the piston moves. You don't want to overfill the hub, as it will cause the grease seal at the rear of the hub to blow out and let the grease escape.

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expert reply by:
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Jameson C

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