How to identify two of the main reasons for bearing failure

How to identify two of the main reasons for bearing failure

1. INDENTATIONS OR BREAKAGE OF THE SHOULDER DUE TO INCORRECT FITTING

EVIDENCE

■ Presence of indentations located on the edge of the track and often seen over the complete circumference of the ring.
■ The indentations are in line with the position of the rolling elements.
■ Damaged or broken shoulder.
■ A slapping noise to the assembly.

CAUSES

■ The bearing was off-centre when fitted.
■ The bearing fitting was incorrect.
■ The bearing was dropped onto a hard surface.
■ The bearing tightening load was transferred through the rolling elements.

EXPERT ADVICE

■ To avoid damaging the bearing, do not apply load on the inner ring.
■ Follow the general fitting recommendations.

2. SCRATCHES ON SUCCESSIVE BALLS FROM AN UNTIGHTENED DRIVESHAFT

EVIDENCE

■ Damage with circular grooves deforming the surface of the balls.
■ Grooved scratches, similar to ‘petanque’ balls.
■ Matching damage on the bearing tracks.

CAUSES

■ The vehicle was moved without the driveshaft or hub nut in place (such as when being serviced).
■ Damage on the balls from contact and rolling on the inner edge of the track, due to a gap between the inner races.

EXPERT ADVICE

■ Avoid moving any vehicle when the driveshaft nut isn’t tight.






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