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What Replacement Bearings do I Need for My 1983 Mirrocraft Boat Trailer?

Question:

Trailer Bearings - Can you point me to the correct replacement bearings? I have a 1983 Mirrocraft 14 aluminum boat that is sitting on a trailer with the name - Sprint by EZ Loader. The existing bearings say: Japan JN NTN _T-L__6_9

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Expert Reply:

I have a way to determine what replacement bearings you need. Unfortunately, from my research, the JN NTN _T-L__6_9 does not turn up any dimensions or model information.

The easiest way to determine your replacement bearings is to measure the inner diameter of the inner and outer bearing (whichever bearing you need replaced). Also, most bearings have the bearing number etched into the rim. Knowing the race number and the grease seal number can also help. I went ahead and attached a diagram that shows common axle measurements.

If you do not currently have the bearings, you need to measure the thickness of the spindle at the inner bearing and outer bearing location on the spindle. On the attached diagram, that is location C and D. The most precise way to measure is by using calipers like the # PTW80157.

Feel free to respond to this answer with those dimensions, and I can definitely point you in the right direction.

Axle Specs
Axle Specs
(click to enlarge)
How to Measure Bearings, Races, and Grease Seals
How to Measure Bearings, Races, and Grease Seals
(click to enlarge)
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