How Often Should You Repack Trailer Bearings?

Wheel bearings are small, cheap parts that carry the whole weight of your trailer. When they fail, they can overheat, seize, and in the worst case let a wheel come off. Bearing problems are also among the most preventable trailer breakdowns, because the fix is routine maintenance on a schedule.

This guide covers how often to service trailer bearings, the warning signs that something’s wrong, what to check before every trip, and when to hand the job to a shop.

The Short Answer: Follow Your Axle Manufacturer

Your bearing service interval comes from the company that made your axles, not from a forum. Look for the axle maker’s name on a tag or sticker on the axle tube or in your trailer manual.

For example, Dexter Axle’s maintenance schedule lists wheel bearings and cups for inspection for corrosion or wear, plus clean and repack, every 12 months or 12,000 miles. Other axle makers publish their own schedules, so check yours.

Service them sooner if:

• The hubs were submerged, which is common with boat trailers at the ramp. See our Boat Trailer Safety Checklist.
• The trailer sat unused for a long time.
• You notice any of the warning signs below.
• You bought the trailer used and have no service records. See How to Buy a Used Trailer.

What about “EZ-Lube” style hubs?

Some axles have grease fittings that let you add grease without removing the hub. Follow the manufacturer’s instructions for these closely. Adding grease the wrong way can push grease past the inner seal, and on electric brakes that grease can end up on the brake shoes. A grease fitting is also not a substitute for periodically inspecting the bearings. Check your axle manual for its recommendation.

Warning Signs of Bearing Trouble

Stop and investigate if you notice:

• A hub that’s much hotter than the others at a fuel stop. Carefully compare hubs with the back of your hand held near them, or use an infrared thermometer. One hub noticeably hotter than the rest is a red flag. Be careful, because hubs can be hot enough to burn.
• Grinding, rumbling or squealing from a wheel.
• Wheel wobble or play. With the trailer safely jacked and supported, grab the tire at the top and bottom and rock it. Noticeable play needs attention.
• Grease slung on the inside of the wheel or tire, which can mean a failed seal.
• Uneven or unusual tire wear on one wheel. See Trailer Tire Maintenance.
• Smoke or a burning smell from a wheel. Pull over safely right away.

What a Repack Involves

You don’t have to do the job yourself, but you should understand it so you know what you’re paying for:

1. Safely lift and support the trailer on jack stands rated for the load. Never work under a trailer supported only by a jack.
2. Remove the wheel, dust cap, cotter pin or retainer, spindle nut and hub.
3. Remove the seal and the inner and outer bearings.
4. Clean the bearings, races (cups) and hub of old grease.
5. Inspect the bearings and races for pitting, discoloration (blue or dark marks from heat), rust or wear. Replace any damaged parts as a set (bearing and its matching race).
6. Repack the bearings with the grease type your axle maker specifies.
7. Install a new seal. Seals are generally not reusable once removed.
8. Reassemble and adjust the spindle nut to the manufacturer’s procedure, install a new cotter pin or the correct retainer, and refit the dust cap.
9. Inspect the brakes while the hub is off. It’s the ideal time. See our Trailer Brake Controller Guide and Trailer Maintenance Schedule.

The spindle nut adjustment matters: too tight and the bearing overheats, too loose and the wheel has play. Follow your axle manual’s exact procedure.

DIY or shop?

If you have the tools, the axle manual, and a safe way to support the trailer, many owners learn to do this themselves. If you’re unsure, or you find damaged parts or brake problems, a trailer or RV service shop is the right call. Ask them what they replace (seals, bearings, races) and what they find.

Before Every Trip: A 2-Minute Bearing Check

Add these to your pre-trip routine:

• Look for grease on the wheels, tires and the inside of the rims.
• Make sure dust caps are in place.
• On the first stop of the day, compare hub temperatures carefully.
• Listen for unusual noise as you pull away.

Our free Pre-Trip Towing Checklist includes wheel and hub checks you can print.

Carry a Spare Bearing Kit

Many owners carry a spare kit with bearings, races, seals, cotter pins and grease that match their axle, plus the tools to swap a hub at the roadside. A spare hub that’s already assembled and packed can make a roadside fix faster. Make sure it matches your axle and spindle.

Learn the Whole Maintenance Routine

Bearings are one part of keeping a trailer safe. TowPro Academy’s online course covers tires, bearings, brakes and suspension in its equipment and maintenance lessons, alongside hitching, driving and emergency response. It has 51 short video lessons across 6 modules and 950+ pages of downloadable lesson guides. Pass the 50-question final exam with 80% or higher to earn a certificate of completion. See what’s inside the course.

Related: Trailer Maintenance Checklist · Trailer Tire Guide

FAQ

How often should trailer bearings be repacked?
Follow your axle manufacturer’s schedule. Dexter, for example, lists cleaning and repacking wheel bearings every 12 months or 12,000 miles. Service them sooner after submersion, long storage or any warning sign.

What are the signs of a bad trailer wheel bearing?
A hub much hotter than the others, grinding or rumbling noise, wheel play, grease on the inside of the wheel, or smoke or a burning smell.

Do I need to replace the seals when I repack?
Generally yes. Seals are usually replaced whenever the hub is removed. Check your axle manual.

Are grease-fitting hubs maintenance-free?
No. They make adding grease easier, but you still need to follow the manufacturer’s procedure and periodically inspect the bearings.

Related Articles

Trailer Tire Guide: ST vs LT, Load Range, Pressure & Speed Ratings

Read More →

The Pre-Trip Towing Checklist Every Driver Needs

Read More →

Surge Brakes vs Electric Brakes: Which Does Your Trailer Need?

Read More →