1, axle bearing temperature is too high: institutional operation, install bearing parts allows a certain degree of temperature, when you touch body shell by hand, should not feel hot as normal, but it indicates that the temperature is too high.
Cause of bearing temperature is too high: quality does not meet the requirements lubricating oil or deterioration, lubricant viscosity too high body assembled too tight (lack of clearance), bearing too tight; in bearing washer on the shaft or turn; load too large; bearing cage or rolling fragmentation.
2 bearing noises: a minor operation is allowed in the work of rolling bearing noise if noise or unusual noise or impact sound, then bearing failure.
Causes of noise of rolling bearings: more complex, 1) is the inner and outer rings mating surfaces of the bearing wear. Due to this wear, damaged bearing and shell, the cooperation relationship between the bearing and shaft, led to deviations from the correct location, noise resulting from the axis at high speed. When bearings are tired, its surface metal flaking, there will be bearing radial clearance increases the noise. 2) insufficient bearing lubrication, the formation of dry friction and bearing broken produces abnormal noises. 3) after bearing wear loose, loose cage damage, will also have an abnormal noise bearing failures. Rolling bearings check is removed, according to judge the faults of bearings and bearing injuries of damage causes.
3, metal Raceway surface flaking: bearing rolling element and on the inner and outer ring raceways are subjected to periodic pulse loads, thereby creating a periodic change of contact stress. When the number of stress cycles after you reach a certain value, rolling elements or inner and outer ring raceways produces fatigue spalling on the face. If the bearing load is too large, will exacerbate this fatigue. In addition, the bearing is not being installed, axis bending, also have a spalling phenomenon of the Raceway. Raceway on bearing fatigue peeling will reduce the running accuracy of the shaft, body vibration and noise.
4, bearing burn: burn on bearing raceways, rolling temper. Causes of Burns is generally insufficient lubrication, the lubricant quality does not meet the requirements or deterioration, as well as the bearing Assembly too tight.
5, plastic deformation: bearing raceways and the rollers contact surface on the uneven crater, indicate the plastic bearing. The reason for this was a large static bearing loads or impact loads, local stresses exceed the yield limit of material on the surface of the work, which generally occur in low-speed rotating bearings.
6, crack of bearing: cracking of bearing is probably bearing too tight, foreign or inner ring of the bearing is loose, inclusive of deformation of the bearing, install the bearing surface processing such as bad.
7, cage fragmentation: the reason for this is lack of lubrication, rolling breaks, skew, and so on.
8, glue the metal cage on the rolling elements, possibly due to rolling elements are stuck in cages or insufficient lubrication.
Raceways of 9, excessive wear: possibly circle hands of foreign bodies, insufficient lubricants or lubricant brands do not fit.



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