Wheel Bearing Failures. Improper Adjustment RESULT: Large end of rollers & races are worn, galled and spalled. CAUSE: Internal clearances reduced – tight.

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.