The maintenance team replaced the worn valve plate and spring of the 0R-3190 injectors, and carried out pressure testing and adjustment. After maintenance, the return oil volume of the injectors returned to the standard range, and the fuel consumption of the generator set decreased by 8% compared with before. The maintenance personnel reminded that for Caterpillar injectors working under high-load conditions, it is necessary to shorten the maintenance cycle and regularly check the wear of internal components to avoid excessive return oil and increased fuel consumption.