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Bearing failure occurred during operation is often the case, there is no need to fuss. Have failed, judging and handling is the key.
Institutional operation, install bearing parts allows a certain degree of temperature, when you touch body shell by hand, should not feel hot as normal, but it indicates that the temperature is too high.
Cause of bearing temperature is too high: quality does not meet the requirements lubricating oil or deterioration, lubricant viscosity too high body assembled too tight (lack of clearance), bearing too tight; in bearing washer on the shaft or turn; load too large; bearing cage or rolling fragmentation.
Some hand lack of identification bearing experience, whenever you see bearing no obvious injuries would continue to be used, subsequently causing serious malfunction. Just remove the bearing without checks will be replaced, sometimes also replaced the bearings can continue to use. The technical condition of the bearing should be carried out on a private tester to check, data measurement can also dial indicator. For General hand, but, when you do not have these conditions, available empirical method a cursory check.
(1) to observe the law. Observation on the bearing with the naked eye, both within and outside the Raceway should be no signs of peeling and excessive wear and is a circular Groove; all rolling surface should be no spot, crack and Peel; cage should not be loose, non-destructive, not worn, and the rolling gap, however.
(2) the handle method. Normal clearance of the bearing rings and rolling elements both inside and outside of 0.005~0.010 mm. Have used a stage bearing, axle of squeeze with your fingers when you shake, no obvious rock sound.
(3) turn the law. Clamping bearing inner race with one hand and the other hand turn the outer race, the bearings should be able to rotate flexible, and should feel no radial shake.
When checked, 3 of the above experiences should be combined to facilitate the technical condition of the bearing to make the right judgments. For tapered roller bearings, also should watch rolling is in the middle of things, if it has moved forward, should be less than 1.5 mm.
Bearing allows a slight running noise at work, if the noise is too large or unusual noise or impact sound, then bearing failure.
Bearing noise is caused is more complex, one of which is within, the outer mating surfaces of the bearing wear. Due to this wear, damaged bearing and shell, the cooperation relationship between the bearing and shaft, led to deviations from the correct location, noise resulting from the axis at high speed. When bearings are tired, its surface metal flaking, there will be bearing radial clearance increases the noise.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7009ATYNDBLP4 NSK | 45 | 75 | 16 |
| 7009A5TYNDBLP4 NSK | 45 | 75 | 16 |