李国杰（经理）：18202125732 直线：021-61062636
(1)安全防护方面。挖掘机各部件应完好无损、连接紧固凡外露的可旋转零部件均需安装防护罩。
驾驶室方面。驾驶室应牢固可靠，玻璃完好无损，门窗关闭灵活，门锁牢固梯子扶手及通道应有防滑措施。
部件方面。动臂、斗杆、履带架、车架、回转平台等重要结构件不应有严重塑性变形和裂纹，焊缝连接处无明显焊接缺陷(气孔、夹渣、未焊透及未熔合等)，螺栓、铆钉连接不得松动。
(2)发动机方面。发动机能顺利启动，运转平稳、怠速稳定，无异响;发动机的润滑、冷却、排气系统的机件应完整无损，且运转良好;液压油压力正常。
(3)液压系统方面。液压系统无老化、龟裂、损伤、漏油等现象。
(4)电气系统方面。各仪器、仪表、照明灯确保无损坏。系统中应设置作业灯、室内照明灯、性能可靠的起步音响报警装置等设备，照明和信号装置的性能应符合GB/T20418的规定;电气导线无老化、***电气连接接触良好，接插件无松动;显示器(如目视显示器、报警信号器)可正常工作;蓄电池应固定牢固并装有保护罩。
(5)回转制动方面。要具备安全可靠的回转制动系统。
(6)制动性能方面。应符合GB/T9139.1要求，即在不小于40%的坡度上驻车制动，然后将挖掘机掉头180°，两种状态下分别驻车制动5min，确保设备不下滑(试验时挖掘机的工作装置应处于运输位置)。
(7)倾翻保护。若二手挖掘机配备有倾翻保护装置、滚翻保护装置或落物保护装置，应分别符合GB/T19930、GB/T17771和GB/T17922的规定。
(1) Safety protection. All parts of the exc***ator shall be intact and firmly connected. All exposed rotatable parts shall be installed with protective cover.
Cab. The cab shall be firm and reliable, the glass shall be intact, the doors and windows shall be closed flexibly, the door lock shall be firm, and the ladder handrail and passage shall be provided with anti-skid measures.
Parts. There should be no serious plastic deformation and crack on the important structural parts such as boom, ***et stick, crawler frame, frame, rotary platform, etc. there should be no ***ious welding defects (air hole, slag inclusion, incomplete penetration and incomplete fusion) at the weld joint, and the bolt and rivet connection should not be loose.
(2) Engine. The engine can be started ***oothly with stable operation and idle speed without abnormal noise; the parts of engine lubrication, cooling and exhaust system shall be intact and in good operation; the hydraulic oil pressure shall be normal.
(3) Hydraulic system. The hydraulic system has no aging, cracking, damage, oil leakage and other phenomena.
(4) Electrical system. All instruments, meters and lamps shall be free from damage. The system shall be equipped with work lights, indoor lights, reliable starting sound alarm device and other equipment. The performance of lighting and signal devices shall comply with the provisi*** of GB / t20418; the electrical wires shall be free from aging and exposure, the electrical connection shall be in good contact, and the connector shall not be loose; the display (such as visual display and alarm signal) can work normally; the battery shall be fixed firmly and equipped with protective cover.
(5) Rotary brake. It is necessary to h***e a safe and reliable rotary braking system.
(6) Braking performance. It shall comply with the requirements of GB / t9139.1, that is, park and brake the exc***ator on a slope of not less than 40%, and then turn the exc***ator 180 ° to park and brake for 5min respectively under the two conditi*** to ensure that the equipment does not slide down (the working device of the exc***ator shall be in the transportation position during the test).
(7) Rollover protection. If the second-hand exc***ator is equipped with tipping protection device, rollover protection device or falling object protection device, it shall comply with the provisi*** of GB / t19930, GB / t17771 and GB / t17922 respectively.
李国杰（经理）：18202125732 直线：021-61062636
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