How To Repack Bearings On Trailer

How to Repack Bearings on Trailer

If you own a trailer or a boat, it’s important to know how to maintain it properly. One of the most crucial elements of trailer maintenance is repacking the bearings. Bearings are the components that allow your trailer wheels to rotate smoothly. Without proper lubrication, they can wear out, causing damage to your trailer and putting you and other drivers at risk. In this article, we’ll walk you through the steps on how to repack bearings on trailer to keep it running smoothly and safely.

Why Repacking Bearings is Important?

Before we dive into the process, let’s discuss why repacking bearings is so important. Bearings are made up of small metal balls that roll around in a circular track. These balls need to be lubricated to reduce friction and prevent wear and tear. Over time, the grease that lubricates the bearings can break down or become contaminated with dirt and debris. When this happens, the bearings can overheat and fail, which can cause serious damage to your trailer and potentially cause an accident.

What You Will Need

Before you get started, make sure you have all the necessary tools and materials. Here is a list of what you’ll need:

  • Jack and jack stands
  • Wrench
  • Grease
  • Clean rags
  • Bearing packer
  • New cotter pin

Steps to Repack Bearings on Trailer

Step 1: Prepare Your Trailer

Park your trailer on a flat surface and engage the parking brake. Use a jack to lift the trailer off the ground, and then place jack stands under the axles for support.

Step 2: Remove the Wheel

Use a wrench to remove the lug nuts and take off the wheel.

Step 3: Remove the Bearing

Remove the dust cap from the hub, and then use a wrench to loosen the castle nut. Carefully remove the washer and outer bearing.

Step 4: Clean the Bearings

Use a clean rag to wipe off the old grease from the bearings.

Step 5: Pack the Bearings

Place a dollop of grease on the palm of your hand. Take the bearing and roll it in the grease until it is completely covered. Use a bearing packer to ensure that the grease is evenly distributed inside the bearing. Repeat this process for the other bearing.

Step 6: Reinstall the Bearings

Place the inner bearing back into the hub, followed by the washer and outer bearing. Tighten the castle nut to the manufacturer’s specifications.

Step 7: Replace the Dust Cap

Put the dust cap back on and tap it gently into place with a hammer.

Step 8: Reinstall the Wheel

Put the wheel back on and tighten the lug nuts.

Step 9: Lower the Trailer

Use the jack to lower the trailer back onto the ground, and then remove the jack stands.

Step 10: Repeat the Process

Repeat the process for the other wheels on your trailer.


Q: How often do I need to repack my bearings?

A: It’s recommended to repack your bearings every 12 months or 12,000 miles, whichever comes first. However, if you use your trailer frequently or in harsh conditions, you may need to repack them more often.

Q: Can I reuse the old cotter pin?

A: No, it’s always recommended to use a new cotter pin when repacking your bearings.

Q: What type of grease should I use?

A: You should use a high-quality, water-resistant grease that is specifically designed for trailer bearings.


Repacking your trailer bearings is an essential part of trailer maintenance. By following these steps and doing it regularly, you can ensure that your trailer runs smoothly and safely on the road. Remember to always use high-quality grease and replace any worn or damaged parts as needed.