(1) Remove the decorative cover and dust cover of the hub axle head;
(2) Remove the tire nut and tire, taking care not to damage the thread of the tire bolt. If it is a disc brake, the brake should be removed and then used to remove the lock ring or pin.
(3) Remove the hub with special tools;
(4) Scrape off the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with detergent and dry them with cloth, then wipe the hub cavity with cloth.
(5) Check the hub bearings and bearing races, and if cracks, fatigue spalling and loose bearing rollers are found, the bearings should be replaced. If pitting is found on the bearing race, the bearing should also be replaced.

(6) Check the fit between the inner diameter of the bearing and the journal. The fit clearance should not be greater than 0.10mm. When measuring the journal, it should be measured at the upper and lower parts of the vertical ground (this is the large wear part). If the fit clearance exceeds the specified service limit, the bearing should be replaced to restore the normal fit clearance. Burrs and pits on the journal are not allowed to reduce the gap.
(7) After all parts meet the requirements, apply grease to the inner bearing and put it in the hub.
(8) When applying grease to the bearing cavity, be careful to squeeze the grease into the bearing until the grease comes out from the other side of the bearing. Apply a thin layer of grease to the hub cavity and the shaft head cover to prevent rust. Pay attention not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking.
(9) Install the hub and outer bearing on the journal, screw the shaft head adjusting nut by hand, and then use the shaft head wrench to tighten the adjusting nut to the specified torque. After tightening the nut, turn the hub a few times to see if the bearing is installed; on the other hand, turn the bearing to match the seat ring correctly by turning. At this time, the bearing is properly tightened, and the wheels rotate freely without feeling the axial clearance.
(10) Then install the lock piece, fixing nut, tire, dust cover and decorative cover in sequence.
(11) After adjusting the hub bearing, drive for a period of time (about 10km), and stop to check the temperature of the hub. If it gets hot, it is caused by the over-tightening of the bearing, and it should be re-adjusted to relax the tightness of the bearing.