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! "If you take the blue smoke to start the engine to start the engine in the cold state at the time appeared" cold state, the phenomenon of blue smoke, second-hand digging machine business platform, but with the growth engine operation time, the sale of second-hand digging machine businesses, the temperature rise, take the blue smoke phenomenon gradually disappeared, 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 enters through the valve seal and combustion inside the cylinder, resulting in blue smoke, the previously mentioned "under the drain." As the engine work time increases, the recovery of used digging machine businesses, the engine temperature increases, thermal expansion valve, the valve seal the existing gap between the elimination of second-hand digging machine business, so take the blue smoke disappears. Used construction machinery excavator in the measurement of the cylinder gap, failed in a direction perpendicular to the piston skirt piston pin hole measurement, and the measurement in the other direction. The structural characteristics of the aluminum alloy of the piston is small great as a cone, and the skirt portion is oval cross section, so that the gap in the circumferential direction of the cylinder is not equal. When measuring provisions to the long axis of the ellipse gap prevail, ie measuring clearance between the piston skirt perpendicular to the direction of the piston pin hole. This measure is more convenient, accurate, and in reciprocation, the piston skirt due to the effect of a vertical lateral pressure in the direction of the piston pin hole worn larger. Used excavator business | Kim Ho used excavators | Used excavator business sales provided by the Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Used excavator business | Kim Ho used excavators | Used excavator business sales are 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.