After the movement period, oscillations and noise maintain a certain level, and the spectrum is very pure, only showing the first and second harmonic frequencies. After the outer spherical bearing continued to operate, it entered the later stage of use. The oscillation and noise of the NTN bearing began to increase, sometimes showing abnormal sounds, but the fluctuation of the oscillation increase was not rapid. At this time, the kurtosis value of the bearing suddenly reached a certain number. NTN bearings exhibit late stage fault characteristics, and the time from the appearance of severe faults (such as shaft holding, burning, sand frame cracking, raceway, bead wear, etc.) usually does not exceed one week. The larger the facility volume, the faster the speed, and the shorter the interval time. Firstly, we need to say that maintaining bearing lubrication and cleanliness is crucial.

NTN bearings exhibit strong regularity in their application process, and their repeatability is also very good. Rare exposure of more than three times the power frequency spectrum, the bearing condition is very stable, entering a stable office period. Attention: It is best to filter the engine oil before use. Try to make the engine oil collect the remaining pollutants as much as possible, and then drain these oil. However, please note that it is not suitable to add too much lubricating grease to the bearings. Due to the possibility of these leftover fibers wedged between the bone and ring components and causing damage, especially in the application of small bearings, this issue requires more attention. So before conducting inspections on the surface bearings of the outer ball, we should first clean the surface of the bearings and then dismantle the parts around the bearings. Attention everyone, oil seals are very weak parts, as they require extra caution during inspection and disassembly. Do not apply excessive force to avoid damage to the parts. Lubricating oil is very important, not only for surface bearings with outer balls, but also for all imported bearings. Then carefully inspect the oil seal of the bearing and its surrounding parts. If any bad symptoms have flashed, it must be easily removed. A bad oil seal can cause damage to the bearing, causing abnormal bearing cloud shape and causing the facility to shut down. We believe that at this point, the surface bearing of the outer ball represents a period of initial failure. After the surface bearing of the outer ball lubricated with engine oil is drained of old engine oil, if possible, fresh engine oil should be added and the machine should be allowed to rotate at low speed for a few minutes. Rub between your fingers with a little bit of lubricating oil, and if there are pollutants present, it can be felt; Or apply a thin layer of lubricating oil on the back of the palm, and then seal it for light inspection. Because of this, in the actual diagnosis of NTN bearing faults, once the characteristic signs of late stage faults are detected, it should not be hesitated to determine the existence of bearing faults and try to expedite the installation, inspection, and repair.

. When the surface bearing of a normal high-quality outer ball is activated, the oscillation and noise are relatively small, but the spectrum is a bit scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs. When using grease lubricating oil in bearings to change the amount of grease, the use of a remover should prevent any part of the bearing from being angled with cotton material. Secondly, we also need to investigate the lubricating oil used in bearings.