What is a common symptom of a worn-out bearing?

A common symptom of a worn-out bearing is excessive noise and vibration. As bearings wear, the internal components can become misaligned or suffer from material degradation, leading to increased friction between moving parts. This results in sounds such as grinding, squealing, or rattling, which are clear indicators that the bearings may need maintenance or replacement. Additionally, the vibration is a direct consequence of the uneven contact surfaces within the bearing, further highlighting the deterioration of its effectiveness.

In contrast, a silent bearing would typically indicate that it is operating properly and not experiencing any significant issues. Reduced friction is also not a typical sign of wear; in fact, worn bearings often face increased friction, which can lead to overheating and additional damage if left unaddressed. Similarly, improved functionality would imply that the bearing is performing optimally, which contradicts the effects of wear and degradation that result in noticeable noise and vibration. Therefore, the presence of excessive noise and vibration is a key indication of bearing problems that require attention.