Because of NSK bearings not use products for a long time, so the damage frequency is high and over a short period of time, to be replaced once, so as not to cause unnecessary losses, but under what conditions, bearings need to be replaced, how do we tell if a bearing is available? Main importance is to consider the bearing damage, mechanical properties, and transfer conditions, until the next maintenance period and decide. If you can no longer use the following defects, new bearings must be replaced. Inner ring, outer ring, roller and cage at any one of any cracks or gaps.
1, rings, rolling elements on any one fault.
2, rolling on the road surface, rib, rolling a significant injury.
3, cage wear dramatically significant relaxation or rivets.
4 have rust on the surface, rolling, rolling road, injured.
5, roll on the road surface, rolling with serious indentation and indentation.
6, clear the inner circle diameter or outer ring outside diameter surface creep.
Color clear of the   7, caused by the heat.
8, into the bearings with grease, broken clear of the seals or shields.
NSK bearings should be specific judgment method of repair, that bearing has been fully used and the near destruction of the specific judgment as follows:
1) bearing condition monitoring apparatus
Using spectrometer or SPM or I-ID-1 such as iron-bearing status monitoring instruments when the decision to judge the State of bearings and bearing information should be, this is the most convenient and reliable way.
For example, when you use HD-1 instrument, and when the pointer from warning area close to the danger zone, and after taking measures such as improved lubrication when the pointer returned does not, will be able to identify is the problem of NSK bearings themselves, can take up yet when entering the danger zone, bearing repair. Start repair exactly how far away from the danger zone, can be adjusted by the experience.
Using this instrument, you can take full advantage of potential bearing, bearing repair in a timely manner, and avoid failure, is safe and economical.
2) using a simple tool monitoring
Without these instruments, the operator can be hand-rod or tools such as wrenches subject closest to the bearing shell of the machine parts, ears ashamed of tool listens on the bearing from the tools running, using stethoscope adapted for medical use, of course. Normal bearing operation should be even, smooth and not harsh voice, instead of normal bearing operation are a variety of intermittent, or harsh sound of impact. First of all to be used for normal bearing operation, and then you can sure tell NSK bearings with normal operation, and the accumulation of experience through practice, and further analysis of what kind of abnormal sound of bearings correspond to what is not normal. Categories of bearing abnormal sound a lot, hard to explain in words, is driven by experience.



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