In the vehicle maintenance operation, the lithium-ion grease lubrication should be added to the heavy truck parts of the north of Baotou. Some because of no injecting equipment, some for the convenience of work, and the cross axle roller bearing lubrication added butter, resulting in the early damage of the cross shaft. The reason is:

(1) the butter oil film tenacity, Baotou beiben heavy truck parts joint under high torque and alternating load at work, so in Baotou beiben heavy truck parts bearing and shaft neck is difficult to form a good oil film.

(2) the fluidity of the butter is poor, and it is difficult to form a new oil film when the oil film is destroyed in the work.

(3) butter is made from a mixture of slippery oil and calcium soap. When the oil is deteriorated, the butter becomes a hard soap, which not only does not lubricate it, but also affects the injection of new oil, so the wear of the cross shaft is greatly aggravated.

In the process of lubrication, such as no oil filling equipment, only add butter, should pay special attention to regular replacement and inspection, in order to prevent the butter from deterioration.