Keep lubrication in and road contaminants out on your heaviest trailer axles. This genuine Lippert 2-pack unitized wheel end seal is engineered for 12,000 to 16,000 lb rated axle hubs with a 3.125" spindle shaft and 4.5" hub bore -- sold as a pair so you can service both ends of an axle in a single order.
The Lippert 2023134020 is a unitized oil seal designed specifically for the wheel end assemblies found on compatible 12,000 lb, 14,000 lb, and 16,000 lb rated trailer axles. A unitized seal integrates the inner seal lip, outer seal lip, and garter spring into a single pre-assembled cartridge -- meaning no loose components to juggle during installation and a consistent seating depth every time.
Replacing worn or leaking wheel end seals on heavy-duty trailer axles is a critical maintenance task. A failed seal allows bearing lubricant to escape and lets water, dirt, and road grime into the hub, accelerating bearing wear and risking a catastrophic on-road failure. Using the correct OEM-spec Lippert replacement seal ensures proper lip geometry and material compatibility with the lubricant type (oil bath) used on these axle assemblies.
Integrated lips and spring ship pre-assembled -- no separate components to align or lose during hub reassembly.
3.125" inner diameter and 4.5" outer diameter match the factory spindle and hub bore spec for supported 12K-16K axles.
Two seals per kit -- service both wheel ends of a single axle without placing a second order.
OEM-sourced replacement (PN 2023134020 / vendor 08-7928) ensures correct fitment for Lippert-branded heavy axle assemblies.
Standard trailer axles under 8,000 lb often use grease-packed hubs sealed with a simple lip seal pressed into the hub bore. Heavy-duty axles in the 12K to 16K range typically use an oil bath lubrication system -- the entire hub cavity is filled with gear oil, which provides superior lubrication for high-load, high-heat bearing applications like gooseneck flatbeds, large horse trailers, equipment haulers, and fifth-wheel RV trailers.
An oil bath system demands a more capable seal than a basic grease seal. The unitized design addresses this by stacking two sealing lips (one facing inboard to retain oil, one facing outboard to exclude contaminants) into a single rigid carrier. The rigid outer case presses firmly into the hub bore and stays put even as the hub expands and contracts with temperature.
The 2023134020 is designed for oil bath wheel end systems. If your axle uses grease-packed bearings, this is not the correct seal -- verify your hub type before ordering. Oil bath hubs are typically identified by a clear or translucent oil cap (hub cap with a sight glass) rather than a grease-filled dust cap.
Lippert and most heavy axle manufacturers recommend inspecting wheel end seals at least annually or every 12,000 miles -- whichever comes first. Replace seals immediately if you observe any of the following:
Unitized seals must be pressed or driven squarely into the hub bore using a proper seal driver or a correctly sized socket that contacts only the outer case. Driving on the inner lip or seal body will distort the seal and cause immediate leakage. Always clean the hub bore and inspect for nicks or burrs before installing a new seal.
This seal is designed for Lippert heavy-duty trailer axles rated at 12,000 lb, 14,000 lb, and 16,000 lb that use an oil bath hub system with a 3.125" spindle shaft diameter and 4.5" hub bore diameter. Common applications include:
If you are unsure whether this seal fits your specific axle, locate the axle date code and capacity stamp on the tube near the spring seat and cross-reference with Lippert's axle documentation, or contact Lippert technical support with your axle serial number.