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. Structural characteristics of aluminum alloy pistons are small great for a cone, used digging machine platform, and the skirt section is elliptical, so the circumferential direction of the cylinder gap 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. The current period of strong positive second-hand excavator sales, for the first time customers who purchase used excavators, used excavators to the market is certainly a smear eyes, do not know how to choose good quality second-hand excavators, today small How do you recommend compiled based on the identification of used crawler excavator machine quality and price, we want to buy second-hand excavator initial help a friend. The purchase of second-hand excavator view tires, track and walking motor outer ring wear is an important step in identifying a machine, tires, crawler excavators walking time must be friction with the ground, second-hand excavator sales platform, wear is inevitable, according to the degree of wear can indirectly reflect this car use conditions, stonework car prices significantly cheaper than earthmoving vehicles. Used excavator platform | Kim Ho used excavators | used excavators Which platform provided by the Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Used excavator platform | Kim Ho used excavators | Used excavator platform Which 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 this page or Tel picture on to obtain the latest information, contact: Mr. Chairman.