Symptom manifestation: When the vehicle is driving, regular noise is emitted from the wheels, including common types such as "buzzing sound", "rustling sound", and "thumping sound", and the noise will show a clear pattern with the change of vehicle speed - mild at low speeds, amplified at high speeds (above 60km/h), and may be accompanied by changes in noise frequency when turning or bumpy roads; In some cases, the noise persists while coasting in neutral, which can be distinguished from engine noise and transmission system noise.
Core causes:
1.Lubrication failure: The lubricating grease that comes with the sealed wheel
Hub Bearing leaks or dries up due to long-term high temperature (brake system heat dissipation and conduction) and aging and damage of the sealing sleeve, causing direct friction between the rolling elements and the inner and outer metal rings, resulting in abnormal noise.
2.Foreign object intrusion: When vehicles wade through water or muddy roads, sediment and sewage enter the bearing through the gap of the sealing sleeve, wear the surface of the rolling elements, and form irregular friction noise; Winter snow melting agents may also corrode the metal parts of bearings, exacerbating abnormal noises.
3.Installation deviation: During maintenance, bearings are installed too tightly (with excessive axial preload) or too loosely, resulting in uneven force during rotation; Or if the flange is not aligned during installation, resulting in bearing misalignment and abnormal noise after long-term operation.
Response measures:
1.If the noise is mild and the vehicle has not traveled more than 100000 kilometers, you can first check whether the wheel hub bearing seal is intact to avoid further pollution;
2.If the noise is obvious or accompanied by slight vibration, it is necessary to immediately go to a professional repair shop for disassembly and inspection, and replace the faulty bearings (it is recommended to choose original or well-known brand products to avoid secondary failures of inferior parts);
3.When replacing, it is necessary to synchronously check the flatness of the flange to ensure installation coaxiality, and tighten the bolts according to the standard torque (the torque requirements vary for different vehicle models, usually 80-120N · m).
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