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Discoloration / Rust

Holes / Pits / Cavities

Deformation / Denting

Wear

Rolling Surface (Raceway / Ball / Roller)

Services - Troubleshooting - Damage by Location: Rolling Surface (Raceway / Ball / Roller)

Damage by Location

Services - Troubleshooting - Damage by Location: When analysing a bearing during periodic inspection of equipment, operating inspections, or replacement of adjacent parts, the condition of the bearing should be determined.

Scoring

Services - Troubleshooting - Damage by Type - Scoring is surface damage due to accumulated small seizures caused by sliding under improper lubrication or severe operating conditions. Linear damage appears circumferentially on the raceway and roller surfaces.

Fracture

Services - Troubleshooting - Damage by Type: Fracture refers to small pieces which were broken off due to excessive load or shock load acting locally on a roller corner or rib of a raceway ring.

Electrical Corrosion

Services Troubleshooting - Damage by Type - Electrical Corrosion: When electric current passes through a bearing, arcing and burning occur through the thin oil film at points of contact between the raceway and rolling elements.

Denting

Services - Troubleshooting - Damage by Type - Denting: When debris such as small metallic particles are caught in the rolling contact zone, Denting occurs on the raceway surface or rolling element surface.

Seizure

Services - Troubleshooting - Damage by Type - Seizure: When sudden overheating occurs during rotation, the bearing becomes discolored. Then, the raceway rings, rolling elements and cage will soften, melt and deform as damage accumulates.

Rust and Corrosion

Services - Troubleshooting - Damage by Type: Bearing rust and corrosion are pits on the surface of rings and rolling elements and may occur at the rolling element pitch on the rings or over the entire bearing surfaces.

Creep

Services - Troubleshooting - Damage by Type: Creep is the phenomenon in bearings where relative slippage occurs between fitting surfaces and thereby creates a clearance between them surface. Creep causes a shiny appearance with Scoring or Wear.

Smearing

Services - Troubleshooting - Damage by Type - Smearing is surface damage which occurs from a collection of small seizures between bearing components caused by oil film rupture and/or sliding. Surface roughening occurs along with melting.

Wear

Services - Troubleshooting - Damage by Type: Wear is surface deterioration due to sliding friction at the surface of the raceway, rolling elements, roller end faces, rib face, cage pockets, etc.

Cage Damage

Services - Troubleshooting - Damage by Type - Cage damage includes: Cage deformation, fracture and wear; Fracture of cage pillars; Deformation of side face; Wear of pocket surface; and Wear of guide surface.

Flaking

Troubleshooting - Damage by Type - Flaking occurs when small pieces of bearing material are split off from the smooth surface of the raceway or rolling elements due to rolling fatigue, thereby creating regions having rough and coarse texture.

Discoloration

Services - Troubleshooting - Damage by Type - Discoloration of cages, rolling elements and raceway rings occurs due to their reacting with lubricant at high temperature.

Pitting

Services - Troubleshooting - Damage by Type - Pitting: The pitted surface has a dull luster which appears on the rolling element surface or raceway surface.

Cracks

Services - Troubleshooting - Damage by Type: Cracks in the raceway ring and rolling elements. Continued use under this condition leads to larger Cracks or Fractures.