Since NSK imported bearings are not used for extended periods, they tend to experience higher damage rates. As a result, it's necessary to replace them after a short period to avoid unnecessary losses. However, the question remains: under what conditions should these bearings be replaced, and how can we determine if they are still functional? The decision to replace a bearing mainly depends on factors such as the extent of damage, mechanical performance, importance, operating conditions, and the next scheduled maintenance.
If any of the following issues are present, the bearing should no longer be used and must be replaced with a new one:
1. Any of the inner ring, outer ring, rolling elements, or cage has cracks or gaps.
2. There are significant scoring marks on the rolling surface, ribs, or rolling elements.
3. The cage is severely worn, or the rivets are loose.
4. Rust or physical damage is visible on the raceway or rolling elements.
5. There are deep indentations or marks on the raceway or rolling elements.
6. There is noticeable creep on the inner diameter of the inner ring or the outer diameter of the outer ring.
7. Obvious discoloration due to heat is present.
8. The seal ring or dust cover of a grease-sealed bearing is damaged.
To properly assess whether an NSK bearing is still usable, several methods can be applied. One of the most effective is using a bearing condition monitoring instrument, such as a spectrometer, SPM, or I-ID1 device. These tools help evaluate the bearing’s working state and determine when repairs or replacements are needed.
For example, with the HD1 type instrument, if the pointer moves from the warning zone into the danger zone and doesn’t return even after improving lubrication, it indicates that the NSK bearing itself is malfunctioning. Repairs should be initiated before reaching the danger zone, based on operator experience.
Using such instruments ensures safe and cost-effective use of the bearing, allowing timely repairs and preventing unexpected failures.
In situations where advanced monitoring equipment is unavailable, operators can use simple tools like a round bar or wrench placed against the machine casing near the bearing. By listening through the tool (or using a medical stethoscope), you can detect the sound of the bearing. A normal bearing produces a smooth, uniform sound, while an abnormal one may produce irregular, harsh, or intermittent noises.
Developing an ear for normal sounds is crucial. Once familiar with the typical noise of a healthy bearing, operators can more easily identify deviations. Over time, experience helps distinguish different types of abnormal sounds and their corresponding issues. While there are many possible abnormal sounds, most are best identified through practical experience.
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