The size of bearings will change due to changes in material structure during operation. This transformation is influenced by temperature, time, and stress. In order to avoid unacceptable dimensional changes due to structural changes in materials during work, bearing materials must undergo special heat treatment.

The fault symptoms of rolling bearings are generally manifested in two ways: one is that the temperature at the installation site of the bearing is too high, and the other is that there is noise during the operation of the bearing. 1. When the bearing temperature is too high during the operation of the mechanism, the part where the bearing is installed is allowed to have a certain temperature. When touching the mechanism housing by hand, it should be considered normal not to feel hot, otherwise it indicates that the bearing temperature is too high.

The bearings removed during regular maintenance, operation inspection, and replacement of peripheral parts of the equipment are inspected to determine whether they can be reused or whether their condition is good or bad. Carefully investigate and record the removed bearings and their appearance. In order to determine and investigate the remaining amount of lubricant, after sampling, the bearings should be cleaned thoroughly. Next, check the condition of the raceway surface, rolling surface, and mating surface, as well as the wear status of the cage for any damage or abnormalities.

As precision components on mechanical equipment, bearings must have the best performance in order to improve productivity in factories. One of the most important factors related to the use of mechanical equipment performance is bearings. Therefore, during production and processing, the factory must conduct a good inspection of the bearings in the mechanical equipment.

A part of the dynamic surface material of the bearing falls off like fish scales, which is called fatigue peeling During the operation of dynamic bearings, they bear a certain load, even static loads. However, for steel balls and raceways, their stress is cyclic and reciprocating, causing the material to experience dynamic fatigue and reaching the end of the bearing's lifespan. In addition, there are several different definitions of bearing "life", one of which is the so-called "working life", which refers to the actual life that a needle roller bearing can achieve before damage is caused by wear and tear. Damage is usually not caused by fatigue, but by wear, erosion, seal damage, and other reasons.

The size and sound quality of the rolling sound should be checked using a sound detector for the operation of the stamped outer ring needle roller bearings. Advanced tools can accurately identify the problem, and even slight peeling or damage to the bearings can produce abnormal and irregular sounds that can be distinguished by a sound detector.