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TIMKEN bearings in the course of its use showed a strong regularity and repeatability is very good. Normal quality needle roller bearings used in the beginning, vibration and noise are relatively small, but some scattered spectrum and amplitude are small, probably due to some flaws in the manufacturing process, such as surface burr due.
Exercise period of time, to maintain a certain level of vibration and noise, the spectrum is very simple, there is only one or two multiplier. Rarely occurs more than three times the frequency spectrum, TIMKEN bearing condition is very stable, into a stable working period.
Continue to run late into the use, needle roller bearing vibration and noise begins to increase, sometimes different sound, but the change in vibration increases more slowly this time, bearing kurtosis value starts suddenly reaches a certain value. We believe that at this time TIMKEN bearings that showed initial failure.
At this time, it requires close monitoring of the TIMKEN bearings, pay close attention to the changes. Since then, bearing kurtosis values began to decline rapidly, and close to normal, while the vibration and noise begins significantly increased, its growth began to accelerate significantly, when the vibration exceeds vibration standards (such as ISO2372 standard), and its bearing kurtosis value starts Rapid increases, when both exceed vibration standards, and kurtosis values than normal (available kurtosis relative standard), we believe that the bearing has entered the late failure of production, the need for timely maintenance equipment, replacement of needle roller bearings.
Bearing a move, take the outer ring inner ring raceway, because taking rolling body is rolling contact, such as the dark side running track, running track raceway surface is attached does not belong to very, thereby varying the load can be learned premise So being removed TIMKEN bearings environment, what types of bearing seals? . Please take note of and observe strictly the operation raceway track. If carefully observed running track, then this will assume that only radial load to bear large axial load, moment load to bear, or are in the needle without extreme rigidity of the bearing housing inequality.
TIMKEN bearings can check on whether the added load and demolition unexpected errors such as whether the National Assembly and became the reason to escape investigation clues bearing damage done.
If no errors and no choice can perhaps use accurate, then prior to the needle bearing life, but with a very long period of time, is the kind of environment, the damage is releasable form. On the other hand, bearing tooling management system design and implementation. Also no accident damage to mention late, and stand up to take advantage of late damage, as the reason for the late damage, no consideration on the use and insufficient lubrication, and thus also the same thing without intrusion, TIMKEN Bearing Removal of error and shaft deflection large, the shaft and the bearing housing of insufficient so.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-12580/12520 NTN | 20.638 | 49.225 | 19.845 |
| 4T-09081/09195 NTN | 20.625 | 49.225 | 21.539 |