Daily maintenance of roller bearing detail maintenance analysis

First, high temperatures on the bearing surface often indicate that the NTN bearing is operating under abnormal conditions. Excessive heat can be detrimental to the lubricant inside the bearing, potentially leading to its degradation. In some cases, overheating may result from inadequate or excessive lubrication, or from prolonged operation at temperatures exceeding 125°C, which significantly reduces the bearing's service life. The causes of high bearing temperatures can vary and include insufficient lubrication, over-lubrication, contaminated lubricant, excessive load, bearing damage, lack of clearance, or friction between the bearing and oil seals. Therefore, continuous monitoring of bearing temperature is essential—whether measuring the bearing itself or other critical components. If no changes in operating conditions have occurred, any unusual temperature fluctuations could signal an underlying issue. Daily attention to roller bearing maintenance requires a keen eye for detail. Temperature measurement using a thermometer can help accurately determine the condition of the bearing. For important NTN bearings, it is advisable to install a temperature sensor, as failure of such bearings can lead to equipment downtime. Under normal conditions, a bearing should maintain a stable temperature after proper lubrication, typically within one to two days. Paying close attention to these details is crucial for effective maintenance. Second, visual inspection plays a key role in daily bearing maintenance. Ensuring proper sealing and lubrication is vital. The bearing’s seal should remain intact and not show signs of wear. It is recommended to periodically inspect the bearing housing and check the condition of the oil seal to ensure it effectively prevents moisture, corrosive substances, or foreign particles from entering along the shaft. The guard ring and labyrinth seal should also be properly lubricated to provide maximum protection. If the oil seal shows signs of wear, it should be replaced immediately. In addition to preventing contamination, the oil seal helps maintain proper lubrication within the bearing housing. If leakage occurs, it may indicate a worn seal or overfilling of lubricant. Leaks can also result from loose housing joints or excessive lubricant causing pressure buildup. An automatic lubrication system can help ensure the correct amount of lubricant is used. If the lubricant appears discolored or black, it may contain contaminants. Regular visual checks are essential for maintaining the health of NTN bearings.

Medium Single Wheel

Medium Single Wheel

Medium Single Wheel

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