Wheel Bearing Failures
Jan 21, 2016
Wheel Bearing Failures
Improper Adjustment
• RESULT: Large end of rollers & races are worn, galled and spalled.
• CAUSE: Internal clearances reduced – tight adjustment, excessive thrust.
Improper Adjustment• RESULT: Large end of rollers & races are worn, galled and
spalled.
• CAUSE: Internal clearances reduced – tight adjustment, excessive thrust.
Improper Adjustment• RESULT: Large end of rollers & races are worn,
galled and spalled.• CAUSE: Internal clearances reduced – tight
adjustment, excessive thrust.
Improper Adjustment• RESULT: Small end of rollers & races are worn and
spalled.• CAUSE: Loose adjustment.
Misalignment• RESULT: Angled wear of spalling on races.• CAUSE: Cocked installation, improper ring seating,
warped shaft.
Misalignment• RESULT: Angled wear of spalling on races.• CAUSE: Cocked installation, improper ring seating,
warped shaft.
Misalignment• RESULT: Large end wear opposite small end wear.• CAUSE: Cocked installation, improper ring seating,
warped shaft.
Misalignment• RESULT: Large end wear opposite small end wear.• CAUSE: Cocked installation, improper ring
seating, warped shaft.
Impact Loading• RESULT: Indented races that can progress to
spalling.• CAUSE: Impact load during installation or
operation.
Impact Loading• RESULT: Indented races that can progress to
spalling.• CAUSE: Impact load during installation or operation.
Contaminated Lubricant• RESULT: Indented and bruised races and rolling
elements that can progress to spalling.• CAUSE: Hard particles in lubricant.
Contaminated Lubricant• RESULT: Indented and bruised races and rolling
elements that can progress to spalling.• CAUSE: Hard particles in lubricant.
Improper Lubrication• RESULT: Frosting.• CAUSE: Oil film too thin to separate rolling
elements and races.
Improper Lubrication• RESULT: Heat discoloration on rolling elements
and races.• CAUSE: Inadequate lubrication.
Improper Lubrication• RESULT: Catastrophic failure.• CAUSE: Inadequate lubrication.
Poor Fit in Bore and on Shaft• RESULT: Localized Spalls.• CAUSE: Unsupported outer ring – irregular
housing bore.
Poor Fit in Bore and on Shaft• RESULT: Localized Spalls.• CAUSE: Unsupported outer ring – irregular
housing bore.
Poor Fit in Bore and on Shaft• RESULT: inner ring cracks during installation.• CAUSE: Excessive press fit.
Poor Fit in Bore and on Shaft• RESULT: Fretted (corroded) and/or polished ID or OD.
• CAUSE: Insufficient press fit on shaft or in bore.
Etching• RESULT: Corrosion between rolling elements and races
that can progress to spalling.• CAUSE: Moisture.
Etching• RESULT: Corrosion between rolling elements and races
that can progress to spalling.• CAUSE: Moisture.