Universal joint is using devices such as the ball in order to realize the different direction of output shaft power, is the important parts of the car.
Universal joint cross shaft maintenance to running in gear oil, as a result of the universal joint cross shaft needle bearing lubricating oil mouth is always very ordinary grease nipple, give a person illusion butter to lubrication for a long time, in fact, the grease nipple is hard to butter filling on the needle roller bearing, butter lubrication can lead to early cross shaft needle roller bearing damage.