Replace worn or damaged axle hub seals before they lead to bearing failure or costly hub damage. The Lippert 333962 is a matched pair of double lip grease seals engineered for Lippert, Dexter, and Al-Ko trailer axle hubs across a wide range of weight capacities -- from lightweight single-axle trailers up to heavy-duty 8,000 lb rated axles. Sold as a 2-pack so both sides of an axle can be serviced in a single purchase.
Grease seals are a wear item that should be inspected at every bearing repack -- typically every 12,000 miles or annually, whichever comes first. A degraded seal allows road grime, water, and dirt to contaminate bearing grease, leading to premature bearing wear and potential wheel-off failures on the highway. The double lip design on these Lippert seals provides two separate sealing surfaces: the inner lip retains grease in the hub, and the outer lip blocks contaminants from entering.
These seals are a direct OEM-style replacement with a service part number of 122088 and are compatible with the broad range of Lippert, Dexter, and Al-Ko axle configurations sharing the 2.25" bore dimension. If you are doing a full brake or bearing service, replace the seals at the same time -- they are inexpensive insurance against a roadside failure.
Two sealing lips in one seal -- inner lip locks grease in, outer lip keeps dirt, water, and road debris out for longer bearing life.
Fits Lippert, Dexter, and Al-Ko axle hubs rated from 1,250 lbs up to 8,000 lbs -- one part covers a wide range of trailer and RV axles.
Direct fit to the original seal bore. No machining or adapter needed. Cross-references Lippert service part 122088.
One pack services both hubs on a single axle -- the right quantity for a complete axle maintenance job in one order.
A grease seal sits pressed into the inboard face of the hub, riding on the axle spindle. The inner sealing lip faces the bearing cavity and rides lightly on the spindle journal to retain grease under normal operating temperatures and centrifugal force. The outer lip faces road-side and acts as a secondary barrier, scraping debris away from the sealing area. Together, they extend the interval between bearing repacks and protect against contaminated grease -- the leading cause of bearing failure on trailer axles.
The 2.25" ID bore is shared across a large number of Lippert, Dexter, and Al-Ko axle spindle diameters used on travel trailers, fifth wheels, toy haulers, and utility trailers. Confirm fitment by measuring the existing seal bore in your hub or by cross-referencing your axle model against service part number 122088. Common applications include:
Grease seal replacement is a standard part of trailer bearing service and does not require special tools beyond a seal driver or suitable socket of appropriate diameter. Seat the seal squarely in the hub bore -- never cock or drive one side first, as this deforms the seal body. Pack the hub with the appropriate wheel bearing grease before reassembly and torque the castle nut to the axle manufacturer's specification.