Replacement Axles for a Dual-Axle Boat Trailer with a 4,800 Pound Boat  

Question:

Expert Reply:

In order to determine exactly what axles you need for your dual-axle boat trailer, there are a few things we need to consider. The first thing we need to know is the axle capacity of the current axles you have on the trailer. For the easiest way to discover this, I recommend is looking for any axle tag or etched axle number on the crosstube itself. Sometimes this information is inside the axle hubs if the axles came as a complete assembly. Also, the axle information can be found if you have any paperwork you received from your trailer.

If you cannot find any of the identifying information, the next method is to determine the inner/outer bearing number or determining the inner/outer bearing diameters. I went ahead and attached an image that shows how to measure the inner and outer bearings and where the bearings are located on your axles' spindles. I recommend using calipers for making this measurement like the # PTW80157 because the measurements need to be extremely precise.

Once you know the bearing numbers, you can then match that information with the axle chart (see attached) to determine the axle capacity. Once you know the capacity, that is when we have a solid direction to take for the correct axles you need.

The final consideration you need to make us the you need to consider the distance between the hub face to hub face as well as the spring center to spring center. These lengths provide you with the axle length you need for the replacement to make sure the axles aren't too long or too short.

Once you have investigated these methods, feel free to respond to this answer with any information you find.

expert reply by: Bob C

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How to Measure Inner/Outer Bearings and Where to Find Bearing Numbers
(click to enlarge)

Axle Capacity Specs
(click to enlarge)