To determine whether the bearing can be used again, it is necessary to consider the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc. before making a decision.
The bearings that were disassembled during the regular maintenance of the equipment, the operation inspection and the replacement of peripheral parts are inspected to judge whether it can be used again or whether it is in good or bad condition.
First of all, it is necessary to carefully investigate and record the dismantled bearings and their appearance. In order to find out and investigate the remaining amount of lubricant, after sampling, the bearings should be cleaned well.
Secondly, check the raceway surface, the condition of the rolling surface and the mating surface, and the wear state of the cage for damage and abnormalities.   
To determine whether the bearing can be used again, it is necessary to consider the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc. before making a decision.
As a result of the inspection, if any damage or abnormality of the bearing is found, find out the cause and formulate countermeasures in the section of injury. In addition, as a result of the inspection, if there are the following defects, the bearing can no longer be used, and a new bearing needs to be replaced.

a. There are cracks and fragments in any of the inner and outer rings, rolling elements, and cages.

b. Any one of the inner and outer rings and rolling elements has peeled off.

c. The raceway surface, ribs, and rolling elements are significantly jammed.

d. The cage is severely worn or the rivets are severely loosened.

e. The raceway surface and rolling elements are rusty and scratched.

f. There are significant indentations and marks on the rolling surface and rolling elements.

g. Creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.

h. Discoloration is severe due to overheating.

i. The seal ring and dust cover of the grease-sealed bearing are seriously damaged.