How to inspect roll bearings empirically

Some pilots lack the experience to identify rolling bearings. They only need to continue to use them if they see no obvious damage to the rolling bearings, causing serious problems later. Some people only need to remove the rolling bearing, replace it without inspection, and sometimes replace the bearing that can be used continuously. The technical condition of the rolling bearing should be checked on a dedicated tester, and some data measurements can also be made using a dial indicator. However, for the average driver, when these conditions are not available, a rough inspection can be performed empirically.
(1) Observation method. Observe the rolling bearing with the naked eye. The inner and outer raceways shall have no peeling marks and severe wear, and shall be in the form of a circular arc groove; all the rolling body surfaces shall be free of spots, cracks, and peeling; the cage shall not be loose, unbroken, or worn. , The gap with the rolling body is not too large.
(2) Hand touch method. The gap between the inner and outer races and rolling elements of a normal bearing is 0.005 to 0.010 mm. For a rolling bearing that has been used in one stage, when the inner race is pinched by fingers and shaken in an axial direction, there should be no noticeable rattling noise.
(3) Rotation method. Use one hand to hold the inner race of the bearing and the other to rotate the outer race. The bearing should be able to rotate flexibly and radial oscillation should not be felt.
During the inspection, the above three kinds of empirical methods should be combined to facilitate the correct judgment of the technical state of the rolling bearing. For tapered roller bearings, it should also be observed whether the rolling elements are located in the middle of the outer race, and if it has moved forward, it should not exceed 1.5 mm.

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