Doosan DX60R Shop Manual page 104

Fatigue Spalling
Flaking of surface metal resulting from fatigue.
Replace bearing - clean all related parts.
Brinelling
Surface indentations in raceway caused by rollers either under
impact loading or vibration while the bearing is not rotating.
Replace bearing if rough or noisy.
Cage Wear
Wear around outside diameter of cage and roller pockets
caused by abrasive material and inefficient lubrication.
Replace bearings - check seals.
General Maintenance Procedures
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