NTN Imported Bearings Work and Inspection Key Points
After installing NTN imported bearings, it's essential to perform a thorough inspection to ensure everything is set up correctly. For smaller machinery, you can manually rotate the unit to check if it runs smoothly. Pay attention to any foreign objects, scratches, or dents that might affect performance. If the torque isn't stable due to improper installation, or if the bearing seat generates unstable torque, or if there’s excessive friction caused by too small of a clearance, equipment errors, or seal conflicts, these issues should be addressed before proceeding. If no abnormalities are found during manual testing, the power can be turned on. However, for larger machines, manual rotation isn’t possible, so after a no-load start, the machine should be run at idle speed. Check for any vibration, noise, or contact between rotating parts. Only proceed with full operation once everything seems normal. During power operation, start from no-load and low speed, gradually increasing to the required working conditions. Monitor the test process closely—look for unusual noises, changes in bearing temperature, leakage or discoloration of lubricant, etc. If anything seems off, stop the machine and inspect it. In some cases, it may be necessary to remove the bearing for a closer look. The temperature of NTN imported bearings can usually be estimated by checking the external temperature of the housing. However, for more accurate results, the temperature of the outer ring can be measured directly through the oil hole. The bearing temperature typically rises gradually at the beginning of operation and stabilizes within 1–2 hours. If the temperature increases sharply or reaches an abnormally high level, it could indicate issues such as excessive lubricant, too small of a clearance, poor installation, or excessive seal friction. In high-speed applications, improper bearing arrangement or incorrect lubrication methods can also cause problems. To detect abnormal sounds, use a stethoscope or similar tool. 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 housing, damaged bearings, or the presence of foreign particles. Proper maintenance and regular inspections are crucial for ensuring the long-term performance and reliability of NTN imported bearings. Always follow manufacturer guidelines and pay close attention to signs of wear or malfunction.
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