Bearing Damage | Products | Kaman Industrial Technologies

Bearing Damage Analysis


To learn more about each damage mode contact your local Kaman branch or sales representative.

 

Foreign Material

Typical causes include improper cleaning methods, poor oil and filtration wear.

Hard particle contamination
Hard particle contamination
Contamination bruising
Contamination bruising
Fine particle contamination
Fine particle contamination
Internal cage wear from fine particle contamination
Internal cage wear from fine particle contamination

 

Corrosion/Etching

Typical causes include damaged packaging, improper storage and worn or damaged seals.

Roller spaced spalling
Roller spaced spalling
Corrosion on the outer
Corrosion on the outer
ring race
Etching and corrosion
Etching and corrosion
Advanced corrosion and spalling
Advanced corrosion and spalling

 

Inadequate Lubrication

Typical causes include improper greases or oil viscosity, low flow rate and high operation temperatures.

Race deformation from excessive heat generation
Race deformation from excessive heat generation
Pealing
Pealing
Scoring damage in roller end
Scoring damage in roller end
Complete bearing lockup
Complete bearing lockup
Rib scoring
Rib scoring
Roller scoring
Roller scoring

 

Fatigue Spalling

Typical causes include high load, misalignment and stress concentration.

Fatigue spalling on a cylindrical roller bearing
Fatigue spalling on a cylindrical roller bearing
Point Surface Origin (PSO) spalling
Point Surface Origin (PSO) spalling
Fatigue spalling on ball bearing inner ring
Fatigue spalling on ball bearing inner ring
Geometric Stress Concentration (GSC) spalling
Geometric Stress Concentration (GSC) spalling

 

Excessive Preload, Overload and Rollout

Typical causes include excessive load and/or misalignment and improper mounting procedure.

Roller fracture
Roller fracture
Peeling
Peeling
Rollout in bearing outer ring
Rollout in bearing outer ring
Outer ring subcase fracture
Outer ring subcase fracture

 

Misalignment

Typical causes include high load, shaft or housing deflection, inaccurate housing, or shaft machining.

Geometric Stress Concentration (GSC) spalling on bearing outer ring
Geometric Stress Concentration (GSC) spalling on bearing outer ring
Irregular roller path caused by deflection
Irregular roller path caused by deflection
Irregular roller path (180 degrees opposite of above)
Irregular roller path (180 degrees opposite of above)
Geometric Stress Concentration (GSC) spalling
Geometric Stress Concentration (GSC) spalling

 

Handling Damage

Typical causes include improper tool selection (hardened drivers) and poor handling practices.

Outer ring denting
Outer ring denting
Fractured inner ring rib
Fractured inner ring rib
Broken rib on outer race
Broken rib on outer race
Roller spaced nicking
Roller spaced nicking

 

Cage Damage

Typical causes include improper handling, tools and procedures.

Cage deformation
Cage deformation
Roller binding and skewing
Roller binding and skewing
Bent bridge
Bent bridge
Deep dent on cage
Deep dent on cage

 

High Spots and Fitting Practices

Typical causes include improper machining, grinding, or repair methods.

Localized spalling
Localized spalling
Marks from high spot on the housing
Marks from high spot on the housing
Metal tearing and wear
Metal tearing and wear
Pinch point
Pinch point

 

Improper Fit in Housing or Shafts

Typical causes include wrong size and poor form, shaft or housing stress riser and inaccurate machining.

Loose outer ring fit in a
Loose outer ring fit in a
wheel hub
Fracture on inner ring
Fracture on inner ring
Metal contaminant
Metal contaminant

 

Brinell and Impact Damage

Typical causes include rough handling and shock loads exceeding the material's limits.

Roller impact damage
Roller impact damage
True metal deformation
True metal deformation
Shock loading
Shock loading
True brinell on needle bearing drawn cup race
True brinell on needle bearing drawn cup race

 

False Brinelling

Typical causes include excessive vibration during shipment, or when the shaft is stationary.

Extreme vibration
Extreme vibration
False brinelling on a shaft where a cylindrical bearing was mounted
False brinelling on a shaft where a cylindrical bearing was mounted
Wear caused by vibration
Wear caused by vibration
False brinell on outer race
False brinell on outer race

 

Burns from Electric Current

Typical causes include improper electrical grounding of equipment, welding damage, or static discharge.

Electric arc fluting
Electric arc fluting
Fluting caused by electric current
Fluting caused by electric current
Electric arc pitting
Electric arc pitting
Roller with electrical arc burns
Roller with electrical arc burns

 

Adhesive Wear

Typical causes include improper oil film, excess cage friction and gross roller sliding

Roller flats and adhesive wear
Roller flats and adhesive wear
Spherical roller bearing with adhesive wear
Spherical roller bearing with adhesive wear
Skidding, raceway surface
Skidding, raceway surface
Cylindrical roller end with adhesive wear
Cylindrical roller end with adhesive wear

 

Needle Bearing Installation Damage

Typical causes include improper tool design, tool positioning, poor roller alignment and excessive force.

Roller lock-up
Roller lock-up
Bearing stamping lip fracture
Bearing stamping lip fracture

 

WARNING: Never spin a bearing with compressed air. The rollers may be forcefully expelled creating risk of serious bodily harm. Proper maintenance and handling practices are critical. Failure to follow installation instructions and to maintain proper lubrication can result in equipment failure, creating risk of serious bodily harm.

 

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