对NTN轴承设备的定期检修、运转及外围零件更换时被拆卸下来的NTN轴承进行检查时，需要依次判断次NTN轴承零件是否可再次使用和记录使用情况的好于坏。还要要仔细调查和记录被拆下来的NTN轴承和外观情况。为了弄清和调查润滑剂的剩余量，取样以后，要很好地清洗一下NTN轴承。
When inspecting the NTN bearings which are dismantled during the periodic maintenance, operation and peripheral parts replacement of NTN bearing equipment, it is necessary to judge whether the secondary NTN bearing parts can be reused and to record the use of good or bad. We also need to carefully investigate and record the NTN bearings and their appearance. In order to clarify and investigate the remaining amount of lubricant, NTN bearings should be cleaned after sampling.
其次检查NTN轴承的滚道面，滚动面和配合面的状况以及保持架的磨损状态等有无损伤和异常情况特别是要观察滚道面的运行轨迹。判断NTN轴承可否再次使用，要在考虑NTN轴承损伤的程度，机器性能、重要性、运行条件、检查周期等以后再来决定。
Secondly, inspect the raceway surface of NTN bearing, the condition of rolling surface and mating surface, and the wear condition of cage, especially observe the track of raceway surface. Whether NTN bearings can be reused or not should be decided after considering the degree of damage of NTN bearings, machine performance, importance, operating conditions, inspection period and so on.
检查结果，如果发现NTN轴承有损伤和异常情况时，请按照NTN轴承损伤的现象查明原因，制定对策。另外，检查结果，如果有下面几种缺陷的话，NTN轴承就不能再用了，需要更换新的NTN轴承。
Inspection results, if found NTN bearing damage and abnormal circumstances, please according to the phenomenon of NTN bearing damage to identify the causes, formulate countermeasures. In addition, the inspection results, if there are several defects below, NTN bearings can not be used, need to replace the new NTN bearings.
a.内外圈、滚动体、保持架其中任何一个有裂纹和出现碎片的。
A. inside and outside, rolling body, cage any crack and debris.
b.内外圈、滚动体其中任何一个有剥离的。
B. inside and outside, rolling body, any of which is stripped.
c.滚道面、挡边、滚动体有显著卡伤的。
C. raceway, edge and rolling body are significantly damaged.
d.保持架的磨损严重或铆钉松动厉害的。
D.The cage is worn seriously or the rivet is loose.
e.滚道面、滚动体生锈和有伤痕的。
E.The raceway surface and the rolling body are rusty and scarred.
f.滚动面、滚动体上有显著压痕和打痕的。
F.There are significant indentation and mark on rolling surface and rolling body.
g.内圈内径面或外圈外径上有蠕变的。
G.The inner diameter of the inner ring or outer ring has creep.
h.过热变色厉害的。
H.Excessive heat discolouration.
i.润滑脂密封NTN轴承的密封圈和防尘盖破损来严重的。
I. grease seal NTN bearing ring and dust cover are badly damaged.