**Matters to Consider When Inspecting Bearings During Operation** Home > Bearing Knowledge > Matters to Consider in Bearing Inspection /*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";

Things to Pay Attention to When Inspecting Bearings During Work

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As the importance of equipment performance continues to rise, it's essential to monitor the condition of bearings during operation and develop a comprehensive inspection plan in advance. Bearings are one of the most critical rotating components in machinery, and their proper functioning is crucial for avoiding unexpected downtime. Early detection of bearing damage can help prevent unplanned shutdowns and reduce maintenance costs. In critical machines or harsh environments, regular inspection of bearings is even more important. Many monitoring systems and instruments have been developed to assess bearing health, with vibration analysis being one of the most common methods. However, not all facilities are equipped with advanced tools, so operators and engineers must remain vigilant for any signs of trouble. The three main techniques for identifying bearing issues are "listening," "touching," and "inspecting." These traditional but effective methods can often detect problems before they escalate. 1. **Listening to the Bearing** Using your ears is one of the simplest and most widely used methods for detecting bearing faults. Experienced technicians often use electronic stethoscopes or mechanical listening rods to detect unusual noises from the bearing. A well-functioning bearing typically produces a smooth, low hum. If you hear sharp, irregular sounds, such as squeaking, screeching, or knocking, it may indicate a problem. For example, improper lubrication can cause high-pitched noises, while incorrect bearing clearance may result in metallic sounds. Dents on the outer race can create vibrations and loud noises, while damaged rolling elements can produce intermittent sounds. If the bearing is contaminated, it may generate a rhythmic noise. Severe damage often leads to loud, irregular sounds. While hearing can identify issues, by the time a bearing makes loud noises, it might already be at the point of needing replacement. Using modern condition monitoring tools can provide early warnings and help avoid costly failures. 2. **Checking the Temperature** High temperatures are a strong indicator that something is wrong with the bearing. Excessive heat can degrade the lubricant inside the bearing, reducing its lifespan. If the bearing operates above 125°C (260°F) for extended periods, its service life can be significantly shortened. Common causes of high bearing temperature include insufficient or over-lubrication, contamination in the lubricant, excessive load, bearing damage, lack of clearance, or friction from the oil seal. Monitoring the temperature regularly—whether through direct measurement or indirect observation—is essential. Thermometers or infrared sensors can be used to measure the bearing’s temperature accurately. For critical bearings, installing temperature sensors is highly recommended. It's also normal for a bearing to experience a slight temperature increase after re-lubrication, which should stabilize within a day or two. 3. **Inspecting the Oil Seal and Lubrication** Proper sealing is vital to protect the bearing from contaminants and ensure adequate lubrication. Regular visual inspections of the bearing housing and oil seals are necessary. The oil seal should be free of wear and able to prevent foreign particles, moisture, or corrosive substances from entering the bearing. Labyrinth seals and retaining rings should be properly lubricated to maintain effective protection. If the oil seal is worn or damaged, it should be replaced immediately. Oil leakage is a red flag; it could indicate a faulty seal, loose plug, or overfilling of lubricant. It's also important to check the condition of the lubricant. Discoloration or darkening usually means the lubricant has degraded or become contaminated. In such cases, it should be replaced promptly to avoid further damage. --- **Related Bearing Knowledge** - NSK imported bearing inner ring fixing method - Reasons for INA bearing burns and solutions - Analysis of rolling bearing operation characteristics - Correct method for testing bearing concentricity using bearing devices This article links to http:// Please indicate the bearing network http:// Previous: The advantages of FAG bearings in sealing problems Next: Rolling bearing terminology (2) --- By staying proactive and using both traditional and modern methods, you can significantly improve the reliability and longevity of your bearings. Always keep an eye on the small signs—because early detection is key to preventing major failures.

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