Acting hydraulic system is increased by varying the pressure force. A complete hydraulic system consists of five parts, namely, power components, actuators, control components, auxiliary components (attachment) and hydraulic oil. Hydraulic system can be divided into two categories: the hydraulic drive system and hydraulic control system. Hydraulic drive system to transmit power and motion as the main feature. The hydraulic control system is to make the hydraulic system output to meet specific performance requirements (especially dynamic performance) (pump) Training, commonly referred to as the hydraulic system mainly refers to hydraulic drive. Hydraulic motor and the load pressure is increased and then the hydraulic oil is compressed by the hydraulic pump is driven, and therefore (hydraulic pump) agents, is illustrated in Figure 4-1 (a) shows a physical model as shown in the working process of the low-speed region of the hydraulic motor: Push one end of the spring constant speed v0 (equivalent to work under high pressure incompressible media) (pump) finishing, making an object of mass m (equivalent to the motor and load mass moment of inertia) to overcome the "negative characteristics" of friction and movement. When the object is stationary or very slow resistance, compression spring constant increase thrust. (Pump) _ Acting crystal create a hydraulic (certified) _ Jinan crystal by creating a hydraulic pump hydraulic machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal to create a hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal to create a better future for the hydraulic.