Imported car drive shaft universal joint cross shaft mostly solid shaft, the result can reduce the size, enhance the stiffness and strength, but can not set the nozzle, can not be lubricated in maintenance. When the vehicle travels longer, the cross shaft is broken by the lack of grease to the needle roller bearings, the cross shaft and the bowl are ablated and produce abnormal sound. Which is characterized by when the vehicle at low speed, in the lower part of the body to hear a dry friction creak sound, as if the generator bearing dry oil dry friction, clear and simple, rhythmic. Speed to improve the sound significantly, reduce the speed of the transmission on the neutral position of the taxi, the sound weakened but does not disappear. At this time the cross shaft has been missing oil, should be removed disintegration inspection, cleaning refueling. When the cross shaft serious wear and tear, the sound is more obvious, acceleration, deceleration, glide, each stall are heard pound, until the stop running, the sound disappeared. When the sound is diagnosed, the vehicle can be parked on the trench, check the cross shafts, and repair or replace as appropriate.