What is the reason why the horn of Xugong crane rings when the weather temperature is low?

The low weather temperature of Xugong crane is the problem of gearbox. Abnormal sound of transmission is complicated. Due to different reasons, abnormal sound is also different, which can be divided into gear abnormal sound and bearing abnormal sound. Loose bearing and gear ring are noise caused by too large or too small gear meshing clearance, abnormal noise caused by low gear precision during manufacturing and dry grinding noise caused by lack of oil.