Universal joint is the use of ball devices to achieve different direction of the shaft power output, is a very important part of the car.

The maintenance of the universal shaft should run in the gear oil. Because the lubricating oil nozzle of the universal shaft needle roller bearing is always a very ordinary grease nozzle, it gives a person the illusion of adding butter for lubrication for a long time. In fact, the grease nozzle is very difficult to add butter to the needle roller bearing.