There is a large internal gear wheel on one side of the track, and the engine compartment is equipped with a button to control the rotation of the engine compartment (generally, the motor drives the gear wheel to rotate along the internal gear wheel). Hydraulic excavator is generally composed of working device, rotary device and traveling device. Each part can be moved separately. The engine is the power source of the hydraulic excavator. In a convenient place, the motor can also be used.

　　工作装置是直接执行挖掘任务的装置。它是由活动臂、铲斗杆、铲斗等三部分铰接而成。摇臂摇臂、铲斗杆展开和铲斗转动由往复双动液压缸控制。液压挖掘机为满足不同施工作业的需要，可配备多种工作装置，如开挖、吊装、装车、找平、装夹、铲铲、冲击锤等作业机械。

　　The working device is a device that directly performs excavation tasks. It is hinged by three parts: movable arm, bucket rod and bucket. The rocker arm, bucket rod deployment and bucket rotation are controlled by reciprocating double acting hydraulic cylinder. In order to meet the needs of different construction operations, hydraulic excavators can be equipped with a variety of working devices, such as excavation, hoisting, loading, leveling, clamping, shovel, impact hammer and other operating machinery.

　　回转行走装置是液压挖掘机的主体。液压动力为液压马达(油马达)。转动装置可带动工作装置在水平面内转动。行走装置可以带动整个机器移动。如果你了基本结构，你就会明白行走机构是不动的(履带是不动的)，旋转机构可以在旋转电机上自行旋转。

　　Rotary traveling device is the main body of hydraulic excavator. The hydraulic power is hydraulic motor (oil motor). The rotating device can drive the working device to rotate in the horizontal plane. The walking device can move the whole machine. If you solve the basic structure, you will understand that the walking mechanism is immovable (the track is immovable), and the rotating mechanism can rotate itself on the rotating motor.

　　平行刷挖:它是将挖掘机伸臂与边坡体平行进退，主要用侧齿和侧刀配合旋转动作来完成，需要注意对线路和边坡的控制。线:无线放电的地方主要根据视线判断来控制。边坡控制:无中间坡线的边坡开挖主要采用圆弧法和斜线法控制边坡。这种方法如果控制不好，很容易使边坡变大变丑。

　　Parallel brush excavation: it is the parallel advance and retreat of the excavator arm and the slope body, which is mainly completed by the side teeth and side knives combined with the rotation action. It needs to pay attention to the control of the line and the slope. Wire: the place of wireless discharge is mainly controlled according to the judgment of line of sight. Slope control: the arc method and oblique line method are mainly used for slope excavation without middle slope line. If this method is not well controlled, it is easy to make the slope bigger and uglier.

　　刷挖:指的是上游宁夏延长臂挖掘机和整个桶开挖边坡成九十度,当后积极挖掘移动挖掘机重复相同的操作,这种方法主要用于形成斜坡,斜坡(关闭可以使用此方法)操作控制技术:刷边坡的主要用途是大臂与小臂棒旋转复合操作,桶仅用于当地平坡。前刷主要用于按压大臂和闭合小臂。斗只根据坡度调整。

　　Brush excavation: refers to the 90 degree slope of the upstream Ningxia Yanchang arm excavator and the whole bucket excavation. When the mobile excavator is actively excavated, the same operation is repeated. This method is mainly used to form the slope. The slope (this method can be used for closing) operation control technology: the main purpose of brush slope is to rotate and compound the big arm and the small arm, and the bucket is only used for the local flat slope. The front brush is mainly used to press the boom and close the boom. The bucket is only adjusted according to the slope.