Secondary market to buy a used excavator digging machine, after all, is used in the future use of which is certainly bound to be some glitches, but as long as know how to determine fault and repair or no problem, the following small series for the majority of second-hand mining machine users recommend some blue smoke second-hand digging machine fault diagnosis and repair methods, we want to help! "Down" to start the engine cold state blue smoke if you start the engine in a cold state when you take the blue smoke phenomenon, but with the growth of the engine working time, Shanghai second-hand excavator sales, the temperature rose, blue smoke phenomenon gradually disappear, it is determined that the cold burning oil. This is usually due to the valve seal aging, resulting in the sealing effect is reduced, so that the oil into and through the valve seal the combustion cylinder, used excavators sale, produce blue smoke, the previously mentioned "under the drain." As the engine operating time increase, the engine temperature rises, the thermal expansion valve, the valve seal between the existing gap eliminated, take the blue smoke disappears. Used excavator plunger injection pump test of ridicule, many engineering machinery maintenance personnel do not pay attention to check construction machinery piston stroke margin. The so-called plunger stroke margin, second-hand excavator sales center, refers to the amount of movement of the plunger by the cam on the camshaft after top dead center supremacy, but also to continue upward. Adjusted supply start time, second-hand excavator sales information, also check the reason why travel allowance, travel allowance because the plunger and plunger sleeve worn related. After the plunger and sleeve wear, the plunger movement to some to start up more oil so that the oil supply start time delayed. When screwing the adjusting bolt to adjust or switch thicker pads, gaskets, the lowest position of the plunger on the move, the plunger stroke margin decreases. Therefore, when the fuel pump engineering machinery maintenance, debugging, first check the travel allowance, to determine whether the fuel pump also allows you to adjust. Used excavator sales, Kim Ho used excavators, used excavator sales company by the Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Used excavator sales, Kim Ho used excavators, used excavator sales company is Shanghai Jin Hao Used Construction Machinery Co. (www.jinhaosh.cn) this year introduced a new upgrade, the above picture is for reference only, please call or pictures on this page contact telephone number, to obtain the latest information, contact: Mr. Chairman.