Before starting the diesel generator, check the amount of oil in the fuel injection pump and its quality (except for the fuel injection pump forced by the engine) to ensure that the oil quantity is sufficient and the quality is good. If the oil is deteriorated due to mixing with water or diesel, light The early wear of the plunger and the oil delivery valve coupler causes the diesel engine to be insufficiently powered, which is difficult to start, and causes corrosion and corrosion of the plunger and the oil delivery valve coupler in severe cases. Due to the internal leakage of the oil pump, the poor operation of the oil delivery valve, the wear of the oil pump tappet and the casing, and the damage of the sealing ring, the diesel oil will leak into the oil pool and dilute the oil. Therefore, it should be replaced according to the quality of the oil in time. Thoroughly clean the pool and remove impurities such as sludge from the bottom of the oil pool. Otherwise, the oil will deteriorate after a long time. The amount of oil should not be too much or too little. If there is too much oil in the governor, it will easily lead to the "flying" of the diesel engine. If the refueling is too little, the lubrication will be poor. The oil dipstick or the oil plane screw should be used. In addition, when the diesel engine is not used for a long time, it is necessary to check whether there is water, diesel and other impurities in the oil in the oil pump oil pool. If it is necessary to replace it immediately, otherwise it will easily make the plunger and the oil outlet valve due to long-term storage. Pieces of corrosion are stuck and scrapped.