Symptoms of axle shaft damage include deviation of the vehicle, severe shaking, wheel falling off, and abnormal noise during driving. Fully floating axle shafts only bear torque during operation, and are not subject to force and bending moment at both ends. The outer end flange is bolted to the wheel hub, and the wheel hub is mounted on the axle shaft sleeve through two bearings that are far apart. It works reliably and is widely used in commercial vehicles.