In long-term engineering construction of excavators, general actions such as weakness and rotation often appear abnormal, especially when external factors such as a long age and difficult construction environment are added, and such failures and problems are impossible. If you encounter it, you must maintain timely . The next Kobelco excavator maintenance service summarized some reasons for us!
Factors of excavator weakness:
1 Engine fuel system elements
2 Elements of intake and exhaust system
3 Fuel pumps, fuel injectors and other elements on the computer to control the fuel injectors
Detailed description of the inability to maintain hydraulic excavators:
1 Fuel system software elements
Among the factors of engine weakness, the fuel system software elements account for a large proportion, exceeding 50%. It is divided into: the fuel contains water and impurities; the fuel filter device is blocked; the fuel pipeline is blocked, etc.
①The fuel contains water and impurities. The sources of water and impurities are:
(1) When the excavator fuel is used up or half is filled, it is not timely and the temperature difference is large. The moisture in the gas in the fuel tank solidifies into water droplets in the inner cavity of the car fuel tank and is injected into the glaze tank;
(2) The utensils and equipment used in fuel transportation and fueling contain some moisture and impurities;
(3) The fuel itself has some impurities and moisture.
②The fuel filter device blocks the fuel filter device of the hydraulic excavator engine. There are generally three fuel filter devices, each of which is a coarse filter, an oil-water separator and a fine filter. Its effect is to filter out the moisture and impurities in the fuel.
③The blockage of the fuel filter device can be handled by controlling the fuel quality and on-time maintenance and replacement. The maintenance and replacement of the filter device should be selected according to the actual situation and a maintenance and replacement cycle time.
2 into the emission system elements
①The air filter element is blocked and the air intake is not enough. The air intake system is installed with an air filter element to filter the smoke and dust in the gas, prevent this smoke and dust from entering the engine, and damage the plug and engine block and other parts.
②The problem of turbocharging failure. The turbocharging of the engine increases the amount of air supplied to the engine according to the air compression, so that the fuel is sufficiently ignited in the engine. The full-wheel turbocharger further improves the working efficiency of the engine. If the turbocharger is destroyed , It will also lead to insufficient air intake. The clinical symptoms are reflected as: the engine speed ratio cannot be raised, the engine is significantly strenuous, the driving force is insufficient, and the exhaust pipe will emit black smoke from the exhaust pipe, or there will be oil spray out. In severe cases, it cannot be started at that time.
③The engine valve gap cannot be closed
(1) If the valve clearance is too large, the valve organization will open and close early, which will not only reduce the opening time of the valve, but also cause insufficient intake ports and blocked exhaust pipes;
(2) If the valve gap is too small, the valve organization will open early and close late. After the engine temperature rises, the parts will be stretched and stretched automatically to open the valve automatically, which will cause the valve to close tightly and cause steam leakage, which will finally cause the working pressure in the cylinder Lowering and causing incomplete ignition, a lot of carbon deposits at the valve and valve seat, and finally crevice corrosion damage under the erosion of the strong exhaust gas swirl.
hint:
Some machine owners have certain maintenance work experience. Therefore, only by carefully and qualified inspections in the whole process of regular inspection and analysis, we can definitely determine the fault problem and formulate the most suitable treatment plan to make the machine and equipment fully resume work. Of course, if it’s not a driver or boss with basic maintenance skills, don’t disassemble and assemble, but find a reliable maintenance master. The first is to save time, and the second is to ensure that the maintenance is not prone to repairs. !
