Bearing fatigue pitting is due to overload work of the engine, making the bearing overheating and bearing clearance is too large, causing the central bearing fatigue damage, fatigue, pitting corrosion or fatigue. Most of this damage is due to overload, bearing clearance is too large, or unclean lubricating oil, mixed with foreign matter inside. Therefore, the use should be taken to avoid overload bearing work not too low or too high speed operation; idling engine to be adjusted to a steady state; to ensure normal bearing clearance to prevent the engine speed is too high or too low; check and adjust the cooling System work, to ensure that the engine operating temperature appropriate.