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NTN imported bearing lubricant replenishment and replacement limits
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. Examples of performance and exchange limits of lubricating oils are as follows: Summary of performance exchange limits The viscosity change of other oils compared with new oil is within mm2/s25%, and 10-15% is most suitable within 10%. 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 KOHmg/g of metal wear powder is 2 to 3 times that of new oil, and the higher value is taken from the additive. The frequency of the performance test is as follows: during spot check of lubrication method, ordinary rotation conditions are bad, and the rotation conditions are bad. 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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