In principle, all NTN bearing before installing should be kept in their original package. They need to stay clean, no moisture, relatively constant temperature environment. The rolling bearing should stay away from the dust, water and corrosive chemical substances. Shaken and vibration may never destroy NTN bearing mechanical properties, so in processing and storage process must avoid vibration.
Basically, all NTN bearing must be level keep, because of some heavier bearing a long time after leaving the vertical, may be because of their weight and deformation.

With the grease in advance (or sealed) NTN bearing need to be especially careful, because the grease after a long time of after storage density will change. So when NTN bearing is used for the first time, there will be a certain degree of rotating noise. Therefore, this time should be suspended NTN bearing according to the principle of advanced first out to control.

clean

Clean for rolling NN bearing is very important. NTN bearing surface and rolling element turning ring the surface roughness of the μ m usually of 1/10, so smooth surface damage of pollutants is very sensitive. Rotating between surfaces and lubricant layer are generally 0.2 ~ 1 μ m, more than the impurity particles size lubricant type will be rolling element of excessive rolling in NTN bearing steel produced in partial pressure, will eventually result in permanent material fatigue. In addition to this, the outside environment of dust particle size can reach up to 10 μ m, will also NTN damage of bearing. Therefore, the clean environment clean the storage and installation of the bearing is very important.

NTN bearing should use the right tools carefully install and remove. Industry experts estimate, the bearing failure conditions of the early 16% was due to incorrect installation. For large installation (for example in the production facility of) speaking, usually to strictly control condition installation, still can use the right NTN bearing installed equipment.

But, in the maintenance or replacement of the work, the environment is varied. Therefore, in order to ensure the longest NTN bearing service life, full preparations for bearing installation work is necessary.
First of all, the relevant papers, such as drawing, maintenance manual, product manuals etc need careful research. Next, all NTN bearing components, such as axis, spacer ring, caps, washer and so on must be perfectly clean, from pollution. Adjacent parts of the state has to be carefully check.

In order to judge whether the removed NTN bearing can be used again, to wash in bearing after inspection. Carefully check the groove surface, rolling face, with the state, maintains a wear, NTN bearing clearance and an increase in the size of the decline of the precision about without damage, abnormal. The separation of small ball bearings, it with one hand will ring in support level, rotate the outer ring confirm whether fluent.

Tapered roller bearing separation form NTN bearing, can for rolling body, the outer ring groove surface check respectively.

Large bearings for can't use rotate hand, check roller, rolling pavement, maintains a raised edge, face the appearance, the higher the importance of NTN bearing the guarded inspection.

Whether can then use judgment, is considering NTN bearing damage degree, mechanical properties, importance, and operating conditions, to the maintenance of the next time during and decided to. But, if have the following defects cannot be used. Daniel must change new NTN bearing.
Inner ring and outer, rolling body, keep frame of any one on the crack, or gap.

Rings, rolling body any on the fracture.

Groove surface, raised edge, rolling body on significant relaxation.
Rolling road face, rolling body have rust, wound.

Groove surface, rolling elements have serious indentation and play marks.

Inner circle diameter surface or outer diameter of the surface have obvious creep.

Because of the heat resulting from the obvious.

Seal of the grease NTN bearing, sealing ring, or dust cover the breakage of the obvious.




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