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NTN spherical plain bearings are widely used in various engineering machinery and equipment due to their high load capacity, low friction coefficient, and high structural flexibility. However, like all bearings, they require regular maintenance to ensure their performance and reliability. In this article, we will analyze the basic steps of maintenance and overhaul of NTN spherical plain bearings to help improve their longevity and reliability.
The first step in maintaining and overhauling NTN spherical plain bearings is to check their condition. Screw the cover screw on the spherical plain bearing housing, remove the retaining ring from the outer ring, and remove the bearing from the housing. Check the bearing data and determine the axial clearance of the bearing.
After verifying the condition of the spherical plain bearing, the next step is to clean and lubricate it. Clean the spherical plain bearing with an appropriate cleaning solution to remove all dirt and debris. After cleaning, apply a thin layer of lubricant to ensure the bearing operates smoothly. For this process, one should only use recommended lubricants from the bearing manufacturer.
If inspection and cleaning do not reveal any issues, it is not always necessary to disassemble the bearing. However, if there is visible damage or excessive wear, it may be necessary to disassemble and replace parts of the bearing. First, remove the outer ring from the housing. Then, remove the inner ring from the shaft by carefully applying pressure to avoid any damage to the ball or raceway. Finally, remove the end cover from the bearing, and disassemble it accordingly.
Visually inspect the bearing parts for any visible damage or abnormal wear. Check the ball gap, ball surface wear, and outer ring wear. Any parts showing visible wear or damage should be replaced immediately. The recommended replacement parts are usually available through any authorised manufacturer.
Reassemble the bearing and apply lubrication to support the smooth operation of the spherical plain bearings. Apply a thin layer of lubricant on the spherical plain bearing and on the inside of the outer ring. Adequate lubrication helps reduce wear, friction, and heat generated by the spherical plain bearings.
After the reassembly and lubrication, test the NTN spherical plain bearing to check the correct installation and assess its performance and reliability. Once installed, check the bearing on a regular basis to detect any early signs of wear, misalignment, or damage. And, based on the conditions of use, the frequency of inspection should be conducted once in every period.
In conclusion, maintenance and overhaul of NTN spherical plain bearings can help improve their longevity and reliability. The critical steps involve inspection, cleaning, lubrication, disassembly, inspection of bearing parts, and monitoring its performance. It is also essential to thoroughly follow the recommended procedures from the manufacturer during every maintenance and overhaul process. By following these steps and taking necessary precautions, NTN spherical plain bearings will operate efficiently, reducing production downtime and saving on cost.