The semi-axle is an important part of the automobile drive system. When the vehicle is running, the wheel traction, braking force and lateral force can easily cause the semi-axle to produce large bending, torsion, and shear stress. When the car is overloaded and driving at high speed on poor roads, the violent bumps and vibrations will affect the semi-axle; moreover, excessive acceleration and deceleration and frequent use of emergency braking make the semi-axle easy to bend, deform and break. If this half shaft is broken and it makes a noise during driving, it is necessary to stop for maintenance.

When there is a problem with the half shaft, how to repair it?

(1) The half shaft should be inspected for hidden damage, and no cracks in any form should exist.
(2) The half-shaft spline should have no obvious torsion deformation.
(3) Based on the axis of the half shaft, the radial runout error of the unmachined cylinder in the middle of the half shaft must not be greater than 1.3mm; the radial runout error of the outer cylindrical surface of the spline must not be greater than 0.25mm; the inner side of the half shaft flange The runout error of the end face shall not be greater than 0.15mm. If the radial runout exceeds the limit, it should be corrected by cold pressing; if the end face runout exceeds the limit, the end face can be turned for correction.
(4) The increase in backlash of the half shaft spline shall not be greater than 0.15mm compared with the original factory regulations.
(5) The following inspections should also be carried out on the half-shaft assembly (with constant velocity joints on both sides) of front-wheel drive vehicles:

①The outer end ball cage type constant velocity universal joint should have no radial clearance by hand inspection, otherwise it should be replaced.

②The inner constant velocity universal joint can slide in the axial direction, but there should be no obvious radial clearance, otherwise it should be replaced with a new universal joint.

③Check whether the dust cover is aging and cracked, and whether the clamp is effective and reliable. If one part of the dust jacket or clamp fails, a new one should be replaced. Otherwise, it may cause abnormal wear of the universal joint due to the complete leakage of grease, and make the half shaft work abnormally or even make the half shaft scrapped.

If car owners find these problems with the car"s half axle, they should go to the auto repair shop or 4S shop for maintenance in time to ensure driving safety!