>> P.65
1N=0.102kgf=0.2248lbs.1mm=0.03937inchABCDEFGHIJKLMCondition of bearing damageCauseCorrective actionFlakings at opposite circumferential positions on raceway surfacesImproper roundness of housing boreCorrection of housing bore accuracyFlakings in the vicinity of raceway surface edges and roller Improper mounting, Shaft deflection, Poor Careful mounting, Careful centering, Correction endscentering, Poor accuracy of shaft or housingof shoulders of shaft and housing for right anglesFlakings on raceway surfaces with an interval corresponding to Great shock load when mounting, Rusting Careful mounting, Protection against rust for roller pitchduring machine stoppagelong periods of machine stoppageEarly flaking on raceway surfaces and rolling elementsToo small clearance, Too great load, Poor Correct selection of fit and clearancelubrication, Rusting, etc.Correct selection of lubricantGalling on raceway surfaces and rolling surfaces of rollersGrease consistency too hardPoor lubrication in early stageHigh acceleration at startSelection of softer grease,Avoiding quick accelerationGalling between roller end faces and collar guide surfacesPoor lubrication, Poor mounting, Correct selection of lubricantLarge axial loadCorrect mountingCracks in outer or inner ringCracked rolling elements, broken collar Broken cageExcessive shock load, Too much interference.Reevaluation of load conditions, Correction of fit, Poor cylindricity of shaft. Too large fillet radius,Correction of machining accuracy of shaft or Development of thermal cracks,sleeve, Making fillet radius smaller than the Development of flakingDevelopment of flakingShock to collar when mounting,Dropped by careless handlingchamfer dimension of bearingCareful handling and mountingAbnormal load to cage by poor mounting,Minimizing mounting errors, Poor lubricationStudy of lubricating method and lubricantIndentations on raceway surfaces at an interval Shock load applied when mounting, corresponding to the pitch between rolling elements (brinelling)Excessive load while stoppingCareful handlingIndentation on raceway surfaces and rolling surfaces of rollersBiting of foreign substances such as Cleaning of housing, Improvement of sealing, metal chips and sandsUse of clean lubricantFalse brinelling(Phenomenon like brinelling)FrettingVibration when the bearing is stationary such Fixing of shaft and housing, as during transportation, Use of lubricating oil, Oscillating motion with small amplitudeApplication of preload to reduce vibration Localized wear of fitted surfaces accompanied by red-brown Sliding between fitted surfaceswear particlesIncrease of interference, Application of oilWear on raceway surfaces, collar surfaces, rolling surfaces of Penetration of foreign particles, Poor Improvement of sealing, Cleaning of housingrollers, cages, etc.Creep Wear on fitted surfaceslubrication, RustSliding between fitted surfaces, Insufficient tightening of sleeveUse of clean lubricant Increase of interference, Correct tightening of sleeveDiscoloration of rolling elements and/or raceway surfaces and/or flange surfaces, Adhesion and welding, Discoloration of cagePoor lubrication, Too small clearance, Poor Rechecking of fit and bearing clearance mountingRechecking of mounting dimensions and related Supply of proper amount of proper lubricant, Ripples on raceway surfacesMelting by sparks due to electric currentRust or corrosion on bearing inside surfaces or Condensation of vapor in air, on fitted surfacesPenetration of corrosive substancespartsInsulation of bearing, Grounding to avoid electric currentCareful storage if under high temperature and high humidity, Protection against rust, Improvement of sealingA62FlakingGallingBreakageDentAbnormal wearSeizurecorrosionElectriccorrosionRust, Table 41 Damage, causes and corrective action
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