How to Grease Trailer Wheel Bearings (Step-by-Step)

Why Greasing Wheel Bearings Is Important

Greasing wheel bearings reduces friction, prevents rust, and shields against contaminants that can cause premature failure. Proper lubrication dissipates heat and keeps your trailer wheels rotating smoothly—saving you from expensive repairs.​

Tools and Materials Needed

• Trailer jack and jack stands
• Wheel chocks
• Grease gun with bearing-specific grease (marine grease for boat trailers)
• Clean rags or paper towels
• Safety gloves
• Socket wrench, pliers, and screwdrivers

Step-by-Step Guide to Grease Trailer Wheel Bearings

1. Prepare the Trailer
   • Park the trailer on a level surface.
   • Apply the parking brake and chock the wheels for stability.​
2. Lift and Secure the Trailer
   • Use a jack to lift the wheel you’ll be working on, then secure it with jack stands.​
3. Remove Wheel Components
   • Loosen and remove lug nuts.
   • Pull off the wheel bearing cap, cotter pin, and castle nut.​
   • Take out the wheel and hub to access the bearings.
4. Clean the Bearings
   • Remove old bearings and clean with degreaser or appropriate cleaning solution.
   • Wipe away old grease thoroughly, ensuring no debris remains.​
5. Apply Fresh Grease
   • If your trailer has an EZ Lube fitting, attach the grease gun and pump grease while spinning the wheel until fresh grease starts to push the old grease out.
   • For manual packing, put grease in your palm and push the bearing into it in a downward motion until grease appears through the rollers.​
   • Coat all rollers and edges well. Reinstall clean bearings and replace seals if necessary.
6. Reassemble and Inspect
   • Replace hub, bearings, and seals, then reinstall the wheel and torque all nuts per manufacturer specs.
   • Spin the wheel to check for smooth rotation; ensure there is no wobble.
   • Reattach the bearing cap and cotter pin.​
7. Final Clean-up
   • Wipe away excess grease and check for leaks or cracks around seals.​
   • Lower the trailer carefully and remove the jack stands and chocks.

Maintenance Tips for Trailer Bearings

• Inspect and grease trailer wheel bearings at least once per year, or every 10,000-12,000 miles.
• Use only high-quality, water-resistant bearing grease.
• Replace seals whenever bearings are serviced to maintain water- and dust-resistant protection.​