3500 lb Trailer Axle Hub and Drum Grease Seal – 2 Pack

Description

3500 lb Trailer Axle Hub and Drum Grease Seal

The 3500 lb trailer axle hub and drum grease seal is a critical component designed to keep your trailer’s bearings properly lubricated and protected from contaminants. With an outer dimension (O.D.) of approximately 2.565″ and an inner dimension (I.D.) of about 1.719″, this double lip seal is specifically engineered to fit a #84 spindle, commonly found on 3,500-lb trailer axles. The seal’s primary purpose is to maintain a clean, controlled environment for the wheel bearings, preventing premature wear and ensuring smooth, safe towing performance.

Key Product Specifications and Compatibility

• Outer Dimension (O.D.): 2.565″
• Inner Dimension (I.D.): 1.719″
• Double Lip Design: Enhances sealing performance by keeping grease in and contaminants out
• Fits #84 Spindle: Commonly used on 3,500-lb axles
• Works with Dexter 010-019-00 E-Z Lube Grease Seal: Ideal for Dexter 10″ x 2-1/4″ hubs/drums

This grease seal is frequently paired with 1-3/8″ I.D. inner bearings (L68149) and their matching inner bearing cups (L68111). Cross-referenced part numbers include:

• Dexter: 010-019-00
• Transcom: 171255TB
• National: 473336
• NOK: AD2548EO

Why the Grease Seal Is Important

The grease seal forms a tight barrier between the internal components of the hub and the outside environment. This helps retain the grease that lubricates the bearings while simultaneously preventing dirt, water, and other contaminants from infiltrating the assembly. A properly functioning seal leads to:

• Extended Bearing Life: By keeping grease in and debris out, bearings stay lubricated longer, reducing friction and wear.
• Improved Safety: Well-maintained bearings ensure smoother wheel rotation, predictable handling, and less risk of wheel failure.
• Cost Savings: Preventing damage to expensive bearings and races means fewer replacements and less downtime.

How to Replace a Trailer Hub and Drum Grease Seal

Before starting any maintenance, ensure the trailer is on a level surface and properly supported with wheel chocks and jack stands. Always wear appropriate safety gear, such as gloves and eye protection.

1. Remove the Wheel and Hub: Begin by loosening the lug nuts, raising the trailer axle with a jack, and supporting it with jack stands. Remove the wheel to access the hub. Next, remove the dust cap, cotter pin, and spindle nut, and carefully slide the hub and drum assembly off the spindle.
2. Access the Old Seal: With the hub removed, you’ll see the inner bearing and the grease seal at the back of the hub. To remove the seal, gently tap the inner bearing out from the opposite side using a wooden dowel or punch, taking care not to damage the bearing or hub.
3. Remove the Old Seal: Once the inner bearing is out, the old seal can be pried free from the hub. Dispose of it properly and clean any old grease or debris from the hub interior with a clean cloth or solvent as recommended by the manufacturer.
4. Inspect Bearings and Races: Now that you have the hub apart, inspect the bearings and races for any signs of pitting, discoloration, or excessive wear. Even though you may be only replacing the seal, this is an excellent opportunity to ensure the other components are still in good condition.
5. Install the New Seal: Apply a thin layer of fresh grease to the inner bearing and place it back into the hub. Position the new grease seal over the hub bore, ensuring it’s aligned and seated correctly. Gently tap the seal into place using a seal driver or a block of wood and a hammer, applying even pressure until the seal is flush with the hub.
6. Reassemble the Hub: Slide the hub back onto the spindle, reinstall the outer bearing, washer, and spindle nut. Tighten the spindle nut according to the axle manufacturer’s specifications, typically tightening, then backing off and re-snugging to ensure proper bearing preload. Insert the cotter pin, bend it to secure the nut, and tap the dust cap back in place.
7. Reinstall the Wheel: Put the wheel back on, tighten the lug nuts to the manufacturer’s recommended torque, and lower the trailer back onto the ground.
8. Final Check: Spin the wheel by hand to ensure it rotates freely without binding or excessive play. Check for any unusual noises or resistance. If everything feels smooth, you’ve successfully replaced the grease seal.

Why Replace Just the Seal and Not the Bearings and Races?

In some cases, the bearings and races remain in excellent condition, especially if they’ve been well-maintained and haven’t accumulated many miles. If the bearings rotate smoothly, show no signs of wear, and remain properly lubricated, replacing the seal alone can be sufficient. This targeted approach offers several benefits:

• Cost-Effectiveness: Seals are generally less expensive than bearings, allowing you to fix the issue without overspending.
• Efficiency: Changing only the seal is quicker than overhauling the entire hub assembly, meaning less downtime for your trailer.
• Resource Conservation: If bearings and races are still functional, there’s no need to discard perfectly good parts.

Reasons to Keep the Grease Seal in Good Condition

A well-maintained grease seal ensures that the bearings remain properly lubricated and free of contaminants. Investing in regular inspections and timely seal replacements can prevent issues like:

• Seized Bearings: Without adequate lubrication, bearings can overheat and seize, causing extensive damage and posing a serious safety risk.
• Premature Wear: Dirt, grit, and moisture can degrade bearings and races quickly, leading to higher long-term costs.
• Poor Handling: Worn bearings contribute to unstable trailer handling, making it more challenging to maintain control.

Installation Tips for Best Results

• Use Quality Grease: Select a high-temperature, water-resistant wheel bearing grease designed for trailer hubs. A good grease will stand up to heat, moisture, and road grime.
• Keep Everything Clean: Cleanliness is crucial. Any foreign material trapped in the hub can damage bearings and shorten their lifespan.
• Follow Manufacturer’s Torque Specs: Tighten spindle nuts and lug nuts to the recommended torque to ensure proper preload and wheel security.
• Regular Inspections: Even if everything seems fine, inspecting your hubs, bearings, and seals annually or every 12,000 miles can catch minor issues before they escalate.
• Replace in Pairs: If one seal on an axle shows signs of wear, consider replacing the opposite one as well. Consistency in maintenance can improve overall trailer stability.

Long-Term Maintenance and Peace of Mind

Maintaining a solid hub and bearing assembly is a cornerstone of safe and efficient towing. By paying attention to the grease seal’s condition and taking action when necessary, you’ll extend the lifespan of your bearings and hubs, reduce unexpected roadside stops, and ensure your valuable cargo arrives at its destination without incident. The simple step of replacing a worn grease seal can save you from more costly repairs and greater hassles down the road.

Conclusion

The 3500 lb trailer axle hub and drum grease seal is a small yet indispensable component in your trailer’s wheel assembly. With proper installation, regular inspections, and timely replacements, you’ll maintain optimal wheel bearing performance, smoother towing experiences, and a greater sense of security behind the wheel. Whether you’re a weekend adventurer or a professional hauler, taking the time to care for your trailer’s bearings and seals pays dividends in the long run.