VEHICLE DESCRIPTION: BRUSH AND WOOD CHIPPERS BUILT ON TRAILERS EQUIPPED WITH DEXTER AXLES THAT WERE MANUFACTURED WITH A BEARING OPTION KNOWN AS NEV-R-LUBE. THE OPTIONAL HUB UTILIZES A SEALED CARTRIDGE BEARING WHICH IS HELD IN PLACE WITH A RETAINING RING THAT PREVENTS THE HUB FROM SHIFTING ON THE BEARING. SOME OF THESE AXLE ASSEMBLIES WERE PRODUCED WITHOUT THE RETAINING RING.