| Condition | Cause | Solution |
|---|---|---|
| Raceway surface is flaked. Surface after flaking is very rough. | Rolling fatigue. Flaking may be caused early by over-load, excessive load due to improper handling, poor shaft or housing accuracy, installation error, ingress of foreign objects, rusting, etc. |
|
- Deep groove ball bearing
- Inner ring, outer ring, and balls are flaked.
- The cause is excessive load.
- Outer ring of angular contact ball bearing
- Making of raceway surface spacing equal to distances between balls.
- The cause is improper handling.
- Inner ring raceway of a deep groove ball bearing
- Outer ring raceway of an angular contact ball bearing
- Inner ring of deep groove ball bearing
- Flaking on one side of the raceway surface
- The cause is an excessive axial load.
- Inner ring of spherical roller bearing.
- Flaking only on one side of the raceway surface.
- The cause is an excessive axial load.
- Tapered roller bearing
- Flaking on 1/4 circumference of inner ring raceway with outer ring and rollers discolored light brown.
- The cause is excessive pre-load.
- Outer ring of double row angular contact ball bearing.
- Flaking on 1/4 circumference of outer ring raceway.
- The cause is poor installation.
- Thrust ball bearing
- Flaking on inner ring raceway (bearing ring fastened to shaft) and balls.
- The cause is poor lubrication
- Outer ring raceway of double row tapered roller bearing (RCT bearing)
- Flaking originated from electric pitting on the raceway surface (refer to Section "Electrical Pitting").
