How to Replace a Trailer Axle?

When it's time to replace the axle on a trailer, many people choose to hire a mechanic to do the job. With a little knowledge, a few tools, and a solid plan, replacing a trailer axle is a do-it-yourself task easily accomplished by the average person.

The first task is to determine the correct size and specification of the replacement shaft. The maximum load per axle can be found on the trailer's vehicle identification sticker. In addition to the weight class, there are a few measurements that need to be taken when ordering new parts.

First, the shaft length should be measured. If the hub has been removed, the total length from tip to tip can be obtained. If the hub is still in place, the axle should be measured from hub face to hub face.

Next, the spring seat center measurement should be made. If the leaf spring is still installed, it should be measured across the entire shaft, from center to center of the leaf spring. If the spring is not installed, measure from center to center on the spring pad. Using these measurements, replacement shafts can be purchased. 

It's also a good idea to replace all associated mounting hardware and recycle old hardware. If the hubs have not been serviced or replaced recently, show obvious signs of wear or damage, or make noises that indicate worn bearings, this would be a good time to replace them, as they must be removed anyway.

With all the new parts, it was time to install the axles. This is best done with the help of another person to help lift and move the axle. Begin by loosening the lug nuts on both tires.

Then, use the hydraulic jack to lift the trailer and attach it to the four points of the jack stand. Place the trailer firmly on the jack stand, remove the tires and set it aside. If the trailer is equipped with brakes, disconnect the brake lines and take care not to jam the brake lines when removing the axle. If the trailer is equipped with shock absorbers, disconnect the lower shock mount from the axle and set aside the mounting bolts.

Check the shock for leaks or worn mounting grommets and replace them if worn. Remove the hub and brake hardware and set it aside. The shaft is fixed to the leaf spring by means of U-bolts. Remove the U-bolts at both ends of the axle, the axle should be completely disengaged from the trailer. There is an assistant on the other end of the axle that lifts and moves it aside until it is completely free of the leaf springs.

With the spring disengaged, pull the axle completely out from under the trailer. The installation of a new shaft is the reverse of the removal process. Slide the axle under the trailer and position it so the leaf spring rests on the spring seat. Using the new hardware, bolt the axle in place and reconnect the shock if applicable. Reinstall the hub and brake assembly, and reconnect the brake lines.

Finally, install the wheels and lower the trailer from the jack stand. Be sure to check that the brakes are functioning properly and the job is done. Slide the axle under the trailer and position it so the leaf spring rests on the spring seat. Using the new hardware, bolt the axle in place and reconnect the shock if applicable. Reinstall the hub and brake assembly, and reconnect the brake lines. Be sure to check that the brakes are functioning properly and the job is done.

The above is how to replace the trailer axle. If you have any questions or want to buy a trailer axle, please contact us.

Haway is a professional custom trailer axles and parts manufacturer. Our products are exported to Australia, New Zealand, Canada, the United States, and some European countries. Our factory produces a large number of trailer axles, torsion axles, trailer fenders, trailer jacks, and boat trailer parts. Offering a wide range of trailer parts, Haway has one of the most complete lines of trailer parts.