Straight line scratches on surface of raceways or rolling elements caused during mounting or dismounting of bearing.
Inclination of inner and outer rings during mounting or dismounting
Shock load during mounting or dismounting
Use appropriate jig and tools
Avoid shock loads by using a press machine
Center the relative mating parts during mounting
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Mounting Flaws 1
Part: Inner ring of a cylindrical roller bearing Symptom: Axial scratches on raceway surface Cause: Inclination of inner and outer rings during mounting
Mounting Flaws 2
Part: Outer ring of a double-row cylindrical roller bearing Symptom: Axial scratches at roller pitch intervals on raceway surface Cause: Inclination of inner and outer rings during mounting
Mounting Flaws 3
Part: Rollers of a cylindrical roller bearing Symptom: Axial scratches on rolling surface Cause: Inclination of inner and outer rings during mounting