Measured sound check size and sound quality of the sound operation of the rolling bearing, bearing slight peeling damage, will send out abnormal tone and irregular sound, able to distinguish between measured sound devices.

Hearing to identify irregular operation is a very common method. For example: With electronic stethoscope to check the feel of certain parts is not normal noise is often the method used by the experienced operatives: bearing good even turn the state will issue a muffled hum sound. If issued a sharp hissing sound, squeaky sound, and other irregular sounds, often said that bearing in bad situation even turn. Sharp squeaking noise may be caused due to improper lubrication. Improper bearing clearance can also cause a metallic sound. Dent of the concave bearing outer track may cause vibration, resulting in a smooth and crisp sound. As the installation percussion scars will produce noise, this noise will vary with the level of bearing speed. If intermittent noise, said rolling elements may be damaged. This sound occurs when damage to the surface is rolling out of date, and bearing if pollutants are often caused by a hissing sound.

Bearing damage of course, by listening to perceptible, but generally to the bearings must be replaced immediately to non-Therefore, better methods such as such as the SKF electronic condition monitoring equipment (Electronic Condition Monitoring). Than the old method of using a stick or screw than the child arrived on the bearing housing, the other end of the stick to the ear, the new invention can ensure safe, more accurate estimates of bearing condition.