During the long-term construction of Doosan excavator, the general actions such as weakness and rotation often appear abnormal phenomena, especially in addition to the external factors such as the long age and harsh construction environment, and this kind of failure phenomenon is not possible, so the excavator shall be repaired in a timely manner. Next, the maintenance service of Doosan excavator summarized some reasons for us!
Powerless factors of excavator:
1 engine fuel system elements.
2 Air intake and exhaust system elements.
3 Other elements such as fuel pump, fuel injection nozzle and fuel injection nozzle control computer.
Detailed description of weak factors in maintenance of hydraulic excavator:
(1) fuel system software elements
Fuel system software elements account for a large proportion of the factors of engine weakness, more than 50%; The fuel filter is blocked; Fuel pipe blockage, etc
① The fuel contains a lot of water and impurities. The sources of water and impurities are:
(1) The excavator cannot be filled in time after using up or half of the fuel, and the temperature difference is large. The water in the gas in the fuel tank solidifies into water droplets in the inner cavity of the automobile fuel tank and is injected into the glaze tank;
(2) The vessels and equipment used in fuel oil delivery and feeding have some moisture and impurities;
(3) There are some impurities and moisture in the fuel itself.
② The fuel filter device that blocks the engine of hydraulic excavator is generally divided into three layers: primary filter, oil-water separator and fine filter. Its function is to filter water and impurities in the fuel
③ If the fuel filter device is blocked, it can be handled by controlling the fuel quality and performing maintenance and replacement on time. The maintenance and replacement of the filter device should be based on the actual situation, and a maintenance and replacement cycle time should be selected
2 Elements of inlet and exhaust system
① The air inlet blocked by the air filter element is not enough. The air inlet system is equipped with an air filter element to filter the smoke and dust in the gas, prevent the smoke and dust from entering the engine, and damage the plug, engine block and other parts.
② Turbocharging fault problem engine turbocharging improves the intake air supply of the engine according to air compression, which promotes sufficient ignition of fuel in the engine. The full wheel supercharger further improves the working efficiency of the engine If the turbocharging is damaged, it will also lead to insufficient air intake. The clinical symptoms are: the engine speed is not higher, the engine is significantly laborious, and the driving force is not enough. In addition, the exhaust pipe will emit black smoke, or oil will be ejected, which is more serious and can not be started at that time.
③ The engine valve gap does not fit
(1) If the valve clearance is too large, the valve organization will open late and close early, which will not only reduce the opening time of the valve, but also lead to insufficient air inlet and blocked exhaust pipe;
(2) Too small valve clearance will cause the valve organization to open early and close late. After the engine temperature rises, the parts will be deformed by heating and naturally stretch, which will fully automatically jack up the valve, making the valve closed tightly and causing steam leakage. Finally, the working pressure in the cylinder will be reduced and incomplete ignition will be caused. A lot of carbon deposits will be caused at the valve and valve seat, and crevice corrosion damage will finally occur under the erosion of strong waste cyclones.
Tips:
Some owners have some experience in maintenance work, so we can determine the failure problem and formulate the most appropriate treatment scheme to fully recover the machinery and equipment in the whole process of regular inspection and analysis only if we are careful and qualified. Of course, if you are not an unwheeling operator or a boss with basic maintenance skills, then don't disassemble and assemble at will. It is better to call the after-sales service phone number of Doosan excavator!
