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NTN bearing work after viewing matters
After the NTN bearing installation is completed, it's essential to perform a thorough inspection to ensure everything is functioning correctly. For smaller equipment, you can manually rotate the bearing to check if it turns smoothly without any resistance. During this process, inspect for any foreign objects, scratches, or indentations that could affect performance. Also, check for unstable torque caused by improper seating, excessive friction due to too small clearance, equipment misalignment, or seal conflicts. If no abnormalities are found, you can proceed to power on the system.
For larger machinery, manual rotation is not feasible, so the power should be turned on immediately after a no-load start. Let the machine idle and observe for any vibrations, unusual noises, or contact between moving parts. Once everything appears normal, you can begin the load operation. Start with no-load at low speed and gradually increase the load according to the specified conditions. Monitor the test run for any abnormal sounds, temperature changes in the NTN bearings, leakage or discoloration of the lubricant, and other signs of potential issues. If anything seems off, stop the machine and conduct a detailed inspection. In severe cases, it may be necessary to remove the NTN bearing for further examination.
The temperature of the NTN bearing is typically estimated based on the external temperature of the housing. However, measuring the temperature directly at the oil hole for the outer ring provides more accurate results. The temperature should gradually rise during operation and stabilize within 1–2 hours. If the temperature rises sharply or becomes abnormal, it could indicate problems such as excessive lubricant, insufficient bearing clearance, poor installation, or seal interference. High-speed operations can also lead to temperature issues due to improper bearing arrangement or incorrect lubrication methods.
Abnormal sounds from the NTN bearing can be detected using a stethoscope. Listen for strong metallic noises, irregular sounds, or any other unusual noises that might indicate a problem. Common causes include poor lubrication, misalignment of the shaft or bearing housing, damaged bearings, or the presence of foreign materials inside the bearing.
To ensure long-term reliability, regular maintenance and monitoring of NTN bearings are crucial. Always follow the manufacturer’s guidelines for installation, lubrication, and operation. If you notice any signs of wear or malfunction, address them promptly to prevent further damage and extend the service life of your equipment.
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