What are the common causes of excavator failure analysis solutions and maintenance precautions?

Why is it difficult to start an excavator in winter? 

It is not only determined by its own technical condition, but also by the outside temperature. Starting more difficult in low temperature in winter, mainly due to the following reasons: 

(1) cold winter climate, low ambient temperature, oil viscosity increases, the frictional resistance of the moving parts increases, so that the starting speed is reduced, difficult to start. 

(2) The capacity of the battery decreases with the drop in temperature, which further reduces the starting speed. 

(3) due to the starting speed reduction, compressed air leakage increased, the cylinder wall heat dissipation increased, resulting in the end of compression when the temperature and pressure of the air is greatly reduced, so that the diesel fuel ignition of the delayed period of time to grow, and in severe cases, even can not be burned. 

(4) low-temperature diesel fuel viscosity increases, so that the injection rate is reduced, coupled with the air at the end of the compression of the cyclone speed, temperature and pressure are relatively low, so that the diesel fuel sprayed into the cylinder atomization quality is poor, it is difficult to quickly form a good combustible gas with the air and timely ignition of the combustion, or even can not be on fire, resulting in starting difficulties. 

What are the conditions for good starting performance of excavators? 

(1) There should be enough starting speed. Starting speed is high, the cylinder gas leakage is small, the compressed air to the cylinder wall heat transfer time is short, less heat loss, so that the end of compression gas temperature and pressure can be increased. Generally require a speed of 100r/min or more. 

(2) The sealing of the cylinder should be good. This can further reduce the amount of gas leakage to ensure that the end of compression gas has sufficient combustion temperature and pressure, cylinder compression pressure shall not be less than 80% of the standard value. 

(3) Requirements for the engine relative to the running parts of the fit between the appropriate clearance, and good lubrication. 

(4) The battery should have enough starting capacity, and the technical condition of the starting circuit is normal. 

(5) The amount of starting oil in accordance with the provisions of the injection quality is good, and the injection angle of advance to meet the requirements. (6) The use of fuel that meets the requirements