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1.The raceway tilt peeling:
    NTN Bearing the working surface was tilted to peeling off the ring, bearing in the tilted state, when the angle of inclination to meet or exceed the critical state, and early formation of abnormal rapid wear and spalling. The main cause of poor installation, shaft deflection, journal and shell holes precision low, to take countermeasures to ensure the quality of the bearing installation and improve the axial shaft shoulder shoulder Kong beating accuracy.

2. Ring fracture:
   Ring fracture failure is generally rare, and often is caused by sudden overload. More complex causes, such as NTN Bearing the raw material defects (bubbles, shrinkage), forging defects (over-burning), heat treatment defects (overheating), the processing defects (local burns or surface micro-cracks), the host defects (poor installation, poor lubrication, instantaneous overload), are likely to ring fracture, once received are set out to shock loads or severe vibration. To take countermeasures in order to avoid set out the impact load, select the appropriate amount of interference, installation accuracy, improve the conditions of use and strengthen the bearing manufacturing process quality control.

3. In the circumferential direction, the channel was symmetry location peeling:
    Peeling off the performance of a symmetrical position in the inner ring around the ring with flaking, while the outer ring was weeks peeling off to the symmetrical position (ie, the short axis of the ellipse), the cause is mainly because of the shell hole oval or two semi-split shell pore structure this is particularly evident in motorcycle camshaft bearings. Large needle bearing pressed into the oval shell hole or two semi-split shell fastening the NTN bearing outer ellipse, in the short axis direction of the clearance is significantly reduced or even negative clearance.