The good in the bad. Should carefully investigate and record split down the double row tapered roller bearing and appearance of the situation. In order to understand and investigate the remaining amount of lubricant, sampling after a good wash to double row tapered roller bearings.
    Bearing requires double row tapered roller bearings where the rotation system has been precision balancing, mounting the bearing shaft and housing bore should be higher than the general requirements for the site of the dimensional accuracy and geometrical accuracy, especially for concentricity and retaining shoulder bore or journal verticality, but in consideration of the above problems, it must be noted that the factors NSK Bearings operation and high temperature factor.
Since the bearing is not only high-precision bearing requirements, as well as high temperature bearing requirements, so consider the bearing installation coordination and clearance to take into account the following points: (1) when the temperature rose to high temperature dimensional change and hardness change; (2 ) under centrifugal force caused by the change and the shape change system of forces.
Double row tapered roller bearing raceway deformation after installation to ensure that not too much interference fit amount of interference can not get too big, and the centrifugal force and high temperatures thermal expansion, or cause the mating surface pressure. Or so with the surface relaxation, so the amount of interference must be considered under the premise of these two factors to be calculated tight. Because in normal temperature and velocity, the effective amount of interference for NSK Bearings may be invalid.
    Check the results, if we find double row tapered roller bearings are damaged and abnormal situations, follow identify the reasons for the phenomenon of bearing damage, develop countermeasures. In addition, test results, if there are several flaws words below, double row tapered roller bearings can not be reused, the need to replace the new NSK bearings.
    1 raceway, ribs, rolling a significant injury card.
    2 cage badly worn or loose rivets terrible.
    3 raceway, rolling rust and have scars.
    4 rolling surface, rolling on and playing a significant indentation marks.
    5 inner and outer rings, rolling elements, cage cracks and any one of them will be fragmented.
    6 inner and outer rings, rolling elements of any one of a release.
    7 inner or outer diameter surface creep on the outside diameter.
    8 overheating discoloration powerful.
    9 grease seals and dust sealed bearings serious damage to



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