Excavator engine scrapping main reason

1 According to many years of maintenance experience, the main cause of engine scrap is wear and tear, in which the wear during start-up accounts for 42.4%~50.3% of the total wear. Because the engine is parked for more than 5h, the cylinder wall, piston rod set, match The oil between the components such as the gas mechanism has already flowed into the oil sump under the action of gravity, and the oil film has disappeared. If the engine is started immediately, there will be a period of direct friction between the movement pairs to make the wear Intensified. Especially in the cold winter, due to the high viscosity of the oil and the slow formation of the oil film, the wear will be more serious. Only when the engine starts for a certain period of time, the direct friction will disappear after the formation of the new oil film. In addition, the viscosity of the fuel increases in winter. In the few seconds after the engine is started, the injector is prone to poor atomization. The excavator spare parts fuel will wash the cylinder wall, further destroying the oil film, causing a "dry grinding" phenomenon between the piston ring and the cylinder wall. This will greatly accelerate. Wear of the cylinder wall and piston ring shortens the service life of the engine.

2 When the temperature of the cylinder wall is 5 °C, the amount of engine wear that is incorrectly original spare parts started is equivalent to the wear of 60~80km of normal wheeled machinery or 0.5~1h of normal operation of the track machine; when the temperature of the cylinder wall is -15 At °C, the amount of wear of an incorrect start is equivalent to the wear of the wheeled machine for 150~210km or the normal operation of the track machine for 2-4h.

When starting the engine for the first time every day, you should do the following:

4. Perform regular inspections such as oil level and coolant level before starting.

Separate the working device to ensure that the engine is started without load.

. Pull the throttle lever to the quarter of the full throttle.

Start the engine and release the start switch as soon as the engine catches fire. https://jnjmzm.wixsite.com/sdjygcjx