Applied Product Catalog 2017 2018 Page i22 Technical Reference

i22 Call your local Applied service center to order at 1-866-351-3464 or visit us online at Never spin a bearing with compressed air. The rollers may be forcefully expelled, creating a 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 a risk of serious bodily harm. WARNING CAGE DAMAGE Typical causes include improper handling, tools, and procedures. Cage deformation Roller binding and skewing Bent bridge Deep dent on cage BRINELL AND IMPACT DAMAGE Typical causes include rough handling, and shock loads exceeding the material's limits. Roller impact damage True metal deformation Shock loading True brinell on needle bearing drawn cup race ADHESIVE WEAR Typical causes include improper oil film, excess cage friction, and gross roller sliding. Roller flats and adhesive wear Spherical roller bearing with adhesive wear Skidding, raceway surface Cylindrical roller end with adhesive wear HANDLING DAMAGE Typical causes include improper tool selection (hardened drivers), and poor handling practices. Outer ring denting Fractured inner ring rib Broken rib on outer race Roller spaced nicking 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 wheel hub Fracture on inner ring Metal contaminant BURNS FROM ELECTRIC CURRENT Typical causes include improper electrical grounding of equipment, welding damage, or static discharge. Electric arc fluting Fluting caused by electric current Electric arc pitting Roller with electric arc burns HIGH SPOTS AND FITTING PRACTICES Typical causes include improper machining, grinding, or repair methods. Localized spalling Marks from high spot on the housing Metal tearing and wear Pinch point FALSE BRINELLING Typical causes include excessive vibration during shipment, or when the shaft is stationary. Extreme vibration False brinell on a shaft where a cylindrical bearing was mounted Wear caused by vibration False brinell on outer race NEEDLE BEARING INSTALLATION DAMAGE Typical causes include improper tool design, tool positioning, poor roller alignment, and excessive force. Roller lock-up Bearing stamping lip fracture Photos courtesy of The Timken Company. Continued from previous page. Bearings

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