1. Plastic surgery. Specifically, the spline shaft and universal joint fork are cut off on a lathe, a long steel rod slightly smaller than the inner diameter of the shaft tube is inserted into the shaft tube, and then the depression is locally heated and hammered to repair it. After repair, cross-weld the cut spline shaft and universal joint back into place.

2. Replace the spline shaft. Cut the weld between the spline shaft and the shaft tube on the lathe, punch out the old spline shaft, press in the new spline shaft, and then weld it firmly with electric welding. When replacing the splined shaft, you must ensure that the full length of the drive shaft meets the standard size and that the universal joint forks at both ends of the shaft remain on the same plane. After replacement or reshaping, the coaxiality error of the spline shaft and the shaft tube should be checked (use a dial indicator to measure at the end of the spline shaft, the error should not be greater than 1.00mm) and the straightness error of the transmission shaft should not be greater than the regulations. value, and at the same time, it must undergo a dynamic balancing test before it can be installed in a vehicle.