Symptoms and typical conditions

SymptomsTypical conditionsCode
ABCGInadequate lubrication (Wrong type of grease or oil)1
ABCGInsufficient lubrication (Low oil level - loss of lubricant through seals)2
A
GExcessive lubrication (Housing oil level is too high or housing is packed full with grease)3
ABCEGInsufficient bearing clearance (Wrong fit selection)4
BCDEGForeign matter acting as an abrasive (Sand, carbon etc.)5
BCDEGForeign matter acting as a corrosive (Water, acids, paints etc.)6
ABCDEGBearing is pinched in the housing (Bore out of round)7
ABCDEGBearing is pinched in the housing (Warped housing)8
ABCDEGUneven shimming of housing base (Distorted housing bore - possible cracking of the base)9
BCDEGForeign matter in bearing housing (Chips, turnings, or dirt left in housing)10
SymptomsTypical conditionsCode

CHigh air velocity over bearings causing pressure differentials (Oil leakage)11
AGSeals are too tight (Distorted seals)12
ABGMisaligned seals (Rubbing against stationary parts)13
AOil return holes are plugged (Oil leakage)14
ABCEGPreloaded bearings (Cross location)15
ABCEGPreloaded bearings (Two locating bearings on one shaft)16
BCDEFBearing is loose on shaft (Shaft diameter is too small)17
BCDEFBearing is loose on shaft (Adapter sleeve is not tightened sufficiently)18
ABCEGBearing too tight internally (Adapter sleeve is tightened excessively)19
CSplit plummer (pillow) block with uneven surfaces (Oil leakage)20
SymptomsTypical conditionsCode
ABCDEOuter ring spins in housing (Unbalanced load)21
BDENoisy bearing (Flattened surface on rolling element due to skidding)22
CDETapered shaft seat (Concentration of load in the bearing)23
CDETapered housing bore (Concentration of load in the bearing)24
BCDEGShaft shoulder too small (Inadequate shoulder support - bending of shaft)25
ABCGShaft shoulder too large (Rubbing against bearing seals)26
BCDEGHousing shoulder too small (Inadequate shoulder support)27
BCGHousing shoulder too large (Bearing seals are distorted)28
BCDEGShaft fillet too large (Bending of shaft, bearing not properly seated)29
BCDEGHousing fillet too large (Inadequate support)30
SymptomsTypical conditionsCode
ABCGInsufficient clearance in labyrinth seals (Rubbing)31
ACOil gauge breather hole is clogged (Indicates incorrect oil level)32
ACDEGLinear misalignment of shaft33
ACDEGAngular misalignment of shaft34
ACConstant oil level cups (Incorrect level)35
ACConstant oil level cups (Incorrect location)36
ABEGLocking washer prongs are bent (Rubbing against the bearing)37
ABCGIncorrect positioning of flingers (Rubbing against covers)38
ABCDEGSupporting surface is uneven (Bent housing is causing the bearing to be pinched)39
BCDERolling element is dented (Caused by blows to the bearing)40
SymptomsTypical conditionsCode
BBearing noise (Caused by other components)41
ABCLubricant leakage and entry of dirt into the bearing (Worn out seals)42
BDEVibration (Excessive clearance in the bearing)43
BDEVibration (Unbalanced load)44
CEGShaft turns with difficulty (Shaft or housing shoulders are out of square with the bearing seat)45
BBearing is discolored (Blow torch was used to remove the bearing)46
ABCEGOversized shaft (Bearing overheats)47
ABCEGUndersized housing bore (Bearing overheats)48
ABCDEOversized housing bore (Outer ring spins, bearing overheats)49
ABCDEEnlarged housing bore (Excessive peening of non-ferrous housing)50
BEBearing noise (False brinelling)51
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