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Replacement Bearing kit for a 2007 Marine Master Boat Trailer With 2500 lb GVWR  

Updated 04/30/2021 | Published 04/29/2021

Question:

Im looking for a replacement bearing kit for a 2007 Marine Master trailer. It came bundled with a 16 ft. Triton boat. It is listed with gross wgt. of 2500. I think the axle was made by Unique Functional Products

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Expert Reply:

Your boat trailer is most likely equipped with a 2500 lb axle given its GVWR which would mean your boat trailer very likely uses an L44643 inner and outer wheel bearing.

But because there isn't an online reference that would allow me to look up which bearings were used by your boat trailer, the only way to determine for sure that your trailer uses a L44643 inner and outer bearing and which grease seal was used would be to pull one of the hubs. You don't need to disassemble the entire hub, just confirm that the outer bearing has 'L44643' engraved on the side of the bearing cage, then measure the diameter of the spindle where the grease seal rides. If you confirm the L44643 bearing, and that the diameter of the spindle where the seal rides is 1.249 inches, then you'd use the # BK1-100 bearing kit.

The fact that you know the GVWR of the trailer would usually make this a slam-dunk, but boat trailer manufacturers sometimes use proprietary bearings or seals (Tracker is good for that) which is why I'm asking you to confirm by pulling the hub.

I've linked to a how-to video where my buddy Randy will walk you through how to swap out the bearings, races and the grease seal.

expert reply by:
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Mike L
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