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Movement after a period of time, to maintain a certain level of vibration and noise, spectrum is single, only Yi、erbei. Very rare more than three times the frequency spectrum, thrust bearing is very stable and entered a period of stability.
Continue to run access later, SKF bearing vibration and noise starts to build, sometimes appear abnormal noise, vibration increases more slowly, in which case the kurtosis value suddenly thrust bearing reaches a certain value. In our view, when the bearing is characterized by early failures.
At this point, calls for strict monitoring of the FAG bearings, pay close attention to the changes. Thereafter, bearing steep degrees value and began fast declined, and near normal, and vibration and noise began significantly increases, its increased significantly began speed up, dang vibration over vibration standard Shi (as ISO2372 standard), its bearing steep degrees value also began fast increases, dang both over vibration standard, and steep degrees value also over normal value (available steep degrees relative standard) Shi, we think wheel bearing has into late fault produced, needed timely overhaul equipment, replaced bearing.
NSK bearings demonstrate advanced features to a serious failure (usually bearing damage such as sticking, burning, Sandy spallation, Raceway, wear beads and other) most of the time not more than a week, capacity of larger, faster speed, shorter intervals. Therefore, the actual thrust bearing fault diagnosis as soon as discover advanced features, should be decisive judgment bearing faulty, arrange for repair as soon as possible.
Lubricant on fatigue life of rolling bearings and friction, abrasion, temperature, vibration, and so have important implications, without proper lubrication, the bearings will not work. Causes analysis of bearing damage shows that 40% per cent of the damage are associated with poor lubrication of the bearings. Therefore, good lubrication of the bearing is the effective measure to reduce bearing friction and wear. In addition, TIMKEN bearings lubricated with heat, rust-proof, sealed, multiple roles, such as easing the impact, thrust bearing lubrication effect can be briefly described as follows:
A. in two roll surfaces in contact with each other or the sliding surfaces form a thin oil film between two surfaces separated by reducing friction and wear of contact surfaces.
B. oil lubrication, especially with circulating oil lubrication, oil mist lubrication and oil lubrication, the lubricating oil can take most of INA bearing friction heat, efficient thermal dissipation role to play.
C. grease lubrication, prevents external dust and other foreign matter entering the bearing, played a close role.
D. role of lubricant to prevent corrosion of metals.
E. extension of KOYO bearing fatigue life.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4984 NTN | 420 | 560 | 140 |
| NNU4980K NTN | 400 | 540 | 140 |