Since NSK imported bearings are not used for extended periods, they tend to experience higher rates of failure. As a result, it's often necessary to replace them after a short period to prevent unnecessary losses. However, the question remains: under what conditions should these bearings be replaced, and how can we determine when it's time to do so? Assessing whether a bearing is still functional involves evaluating several factors, including the extent of damage, mechanical performance, its criticality in the system, 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:
1. Cracks or breaks in the inner ring, outer ring, rolling elements, or cage.
2. Severe scoring or damage on the raceway, ribs, or rolling elements.
3. Significant wear on the cage or loose rivets.
4. Rust or visible damage on the raceway or rolling elements.
5. Deep indentations or marks on the raceway or rolling elements.
6. Obvious signs of creep on the inner diameter of the inner ring or outer diameter of the outer ring.
7. Noticeable discoloration due to overheating.
8. Damaged seal rings or dust covers on grease-sealed bearings.
To accurately assess the condition of NSK bearings, there are several reliable methods. One of the most effective is using specialized monitoring instruments like spectrometers, SPM, or I-ID1 devices. These tools allow you to monitor the bearing’s working condition and determine the right time for repair or replacement. For example, with an HD1 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 bearing itself is malfunctioning. The exact point at which repairs should begin can be determined through experience.
Using such instruments ensures safe and cost-effective use of the bearing, prevents unexpected failures, and maximizes its service life. In situations where advanced equipment isn't available, simple tools like a metal rod or wrench can be used to listen to the bearing's sound. By placing the tool against the machine casing near the bearing and listening closely, you can detect unusual noises. A normal bearing should produce a smooth, consistent sound, while a faulty one may emit irregular, harsh, or impact-like noises. Developing an ear for these sounds requires practice and familiarity with the normal operating sound. Over time, operators can learn to identify specific types of abnormal sounds and their corresponding issues, making maintenance more efficient and accurate.
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