For models without the Dexter Nev-R Lube Axle, you will need to repack the wheel bearing periodically. From Dexter: Along with bearing adjustment, proper lubrication is essential to the current function and reliability of your trailer axle. Bearings should be lubricated every 12 months or 12,000 miles, whichever occurs first. For new models that feature the Dexter Nev-R Lube Axles, repacking the wheel bearing is not required.