The failure of the universal joint of the drive shaft bracket is mainly due to the wear of the journal and the bearing and the bending and deformation of each journal, which causes the center lines of the cross shafts to be not on the same plane, or the center lines of two adjacent shafts are not vertical.Due to the excessive wear gap between the universal joint cross shaft journal and the bearing, the cross shaft shakes during operation, which causes the center line of the transmission shaft to deviate from its rotation center line.The phenomenon of vibration of the drive shaft and abnormal noise from the drive shaft during operation.

　　Wear is mainly caused by lack of lubrication.The wear of the universal joint cross shaft journal and bearing should not exceed 0.02-0.13mm from the point of view of use, and is generally maintained at about 0.01mm.If it exceeds 0.13mm, vibration and noise of the drive shaft will occur.If the cross shaft journal wears out of the groove and the groove is deep, it should be repaired or replaced.

　　If surfacing and inlay repairs are used, heat treatment and grinding are also required.After processing, the out-of-roundness of each journal is required to be 0.01mm, and the taper cannot be large (the length of 20mm cannot be greater than 0.01mm).To check the verticality of two adjacent axes, be sure to be vertical.After processing and repair, the axis of each journal should be in the same plane.

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