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(I) Inadequate maintenance resulted in poor technical condition of the locomotive (1) Excessive fuel supply adjustment resulted in incomplete combustion of diesel fuel and increased consumption. It was necessary to adjust fuel supply correctly; (2) Injection pressure was too low and fuel injection was used. Poor atomization leads to incomplete combustion and increased fuel consumption. The fuel injection pressure should be adjusted and checked regularly to replace new parts if necessary. (3) The fuel supply advance angle is too large or too small to make the fuel supply incomplete, resulting in incomplete diesel combustion and increased fuel consumption. Should check and adjust the fuel supply advance angle regularly; (4) When the oil valve wears badly, it will appear that the oil supply time is ahead of schedule, the fuel injector is not stopped, and there is a phenomenon of post-dripping. As a result, the increase in fuel supply will result in insufficient combustion and increase fuel consumption. At this point, the valve should be replaced; (5) The air filter is blocked, too much carbon in the exhaust pipe, resulting in insufficient intake, diesel combustion is not sufficient, and fuel consumption increases; (6) The combustion chamber is not sealed it is good. When the seal of the piston, piston ring, cylinder, valve, valve seat, cylinder pad, and injector is not tight enough, air leakage will occur, resulting in insufficient diesel combustion and increased fuel consumption. The above parts should be inspected and repaired or replaced if necessary; (7) Severe oil leakage in the fuel system, such as oil leakage in the fuel tank, low pressure oil line, and tubing connections, will inevitably result in increased fuel consumption of the diesel engine. The seal condition should be checked frequently and oil leakage should be found. Excluded timely. (2) Increased fuel consumption due to improper driving operations (1) Excessive throttle at the start; (2) Overloading and overspeeding operations; (3) No downshifts when climbing, resulting in engines emitting black smoke and consuming more fuel; (4) Free throttle when you work. In summary, as long as proper maintenance and proper driving and operation can save fuel and reduce consumption, locomotives will maintain a good state of technology and create greater economic benefits.