Details To Pay Attention To When Maintaining NTN Bearings

1.Touch

High temperatures often indicate that NTN bearings are in abnormal conditions. High temperatures are harmful to the lubricating oil in the bearings. Sometimes, bearing overheating can be attributed to the bearing’s lubricant, and long-term operation of the bearing at temperatures exceeding 125°C reduces the service life of the bearing. Causes of high-temperature bearings include: insufficient lubrication or excessive lubricating oil, and the lubricating oil contains impurities. , heavy load, bearing damage, lack of space, high temperature friction with the oil seal, etc. Therefore, continuous monitoring of bearing temperature is necessary, whether measuring the bearing itself or other important parts. If there is no change in operating conditions, any temperature changes may cause malfunction. Bearing temperature measurement often helps the thermometer to accurately measure the temperature of the bearing and according to the degree. The important thing about NTN bearings is that when it is damaged, it will cause equipment downtime, so such bearings should preferably be equipped with temperature detectors. Under normal circumstances, the bearings are lubricated and the temperature naturally rises and lasts for a day or two after lubrication.

2. Observe
   If you have a well lubricated bearing with a right barrier to debris and moisture, said seal should not be worn, however, it is best to visually inspect and regularly check the bearing oil seal in the open bearing box, and check the condition of the bearing oil seal everywhere, Make sure they are not sufficient to prevent liquid or corrosive fluids or gases from entering the bearing along the axis. Guard rings and labyrinth seals should be greased for maximum protection. If the oil seal is worn, it should be replaced as soon as possible. In addition to preventing magazine from entering the NTN bearing, another function of the oil seal is to keep the bearing housing lubricated. If the oil seal leaks, immediately check whether the seal is worn or the oil plug is loose. The leakage phenomenon may also be caused by the loosening of the bearing box joints or the formation of mixing and leakage detection due to adding too much lubricant. The automatic lubrication system ensures the correct amount of lubricant and checks whether it is colored or black. If there is such a phenomenon, Lubricants are usually said to contain magazines.

3. Listen
   It is a common method to use hearing to identify irregular movements. For example, listening with the help of an electronic stethoscope is part of the abnormal noise that is experienced by experienced operators. If the bearing is in good working condition it will make a low humming sound. If there is a sharp hiss, squeak and other irregular sounds, it is usually said that the bearing is in poor working condition. A harsh squeaking sound may be caused by improper lubrication. Improper clearance of NTN bearings may also cause metal noise. The dents in the outer ring track of the bearing will produce vibration and cause a smooth and crisp sound. If noise is produced due to the scarring of the installed percussion, the noise will increase with the bearing speed. If there is intermittent noise, the rolling elements may be damaged. This sound occurs when contaminants in the surface of rolling bearings often cause a hissing sound. Severely damaged bearings will produce irregularities and noise.