Construction machinery work place is often a harsh environment of the construction site, the use of construction machinery for some time, should be the necessary maintenance and repair to maintain a good technical condition of the equipment. In the manual of the equipment, generally for each lubrication site have the detailed requirements of filling oil, seals need to be replaced after wear and tear. However, in actual usage surveys, some drivers and maintenance personnel often overlook the above requirements. Several common mistakes are: 1, need lubrication? Add a little more oil! Due to the different parts of the equipment and the status of the work in different ways, so for each lubrication point of the refueling cycle, each refueling and filling methods have strict requirements, driving, maintenance personnel should be strictly required Implementation, can not add a little oil trouble, it is difficult to meet the lubrication requirements. 2, it has been added oil, but also owe lubrication? Equipment movement parts, working methods and different ambient temperature, the requirements of the lubricant is also different, according to the requirements of different types, different grades of lubricants. Only with the necessary additives, with the required physical and chemical indicators of lubricants, to make the device get good lubrication; not look at the grades just refueling is a bad thing.