NTN imported bearing lubricant replenishment and replacement limits1

The lubricating performance of the lubricant will become weaker as the service time becomes longer, and new lubricant must be replenished after a certain interval. The relubrication interval needs to be selected according to the bearing type, size, rotation speed, bearing temperature and lubricant type. Please refer to the general manual of NTN Rolling Bearings for the intervals and diagrams of lubricant replenishment. The replacement limit of lubricating oil varies according to the operating conditions of the machine and the method of oil supply. According to the performance analysis test of the lubricating oil, as shown in Table 2, the approximate replacement limit and the interval of the test frequency can be calculated. Table 1 Lubricating oil performance and exchange limit example performance exchange limit summary Engine oil The viscosity change of other oils compared with new oil is within mm2/s25%, and 10-15% is most suitable. The occurrence of acidification and deterioration within 10% and the mixing of different oils into water Part volume % 0.2 or less Possibility of reuse after dehydration Weight of insoluble part Pentane molecule % Benzene % 1.0 or less 0.5 or less 0.2 or less 0.9 Additives Carbon wear dust precipitation value ml/10ml 0.1 or less Moisture , dust and other foreign matter, the total acid value of metal wear powder KOHmg/g is 2 to 3 times that of new oil, and the higher value is taken from additives. Performance test frequency of lubricating oil Lubricating method Ordinary rotation conditions during spot inspections Severe rotation conditions Disc oil supply method once a year, once every 6 months Oil immersion, droplet oil supply method, once every 6 months, every 3 Once a month oil circulation method Once every 9 months 1 to 3 months The severe rotation conditions are as follows. 1. Condensation or mixing of water is obvious. 2. Contamination of dust particles etc. is evident. 3. The rotation temperature is above 120 degrees.

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