In order to increase the load capacity of construction machinery, direct way is to increase its hydraulic system pressure, flow and power. Currently, advanced engineering machinery products rated international pressure, mostly in more than 30 MPa, and with advances in materials science and technology, there are toward the higher pressure even using high pressure hydraulic technology trends in the direction of development; flow rate per minute is usually Hundreds of liters; power over hundreds of kilowatts. Such as Germany Orensttein && Koppe made the world's first largest RH400 full hydraulic excavators, hydraulic motor repair, bucket capacity of 42 m3, hydraulic oil source for the variable displacement axial piston pump 18, the total flow of up to 10,200 L / min; the original motivation for the two QSK60 diesel engine, with a total power of up to 2 014 kW. HST hydraulic CVT has the following advantages: 1) the current closed system variable pump are integrated structure, fill up the oil pump and overflow, integrated valve control and other functions on the hydraulic pump, hydraulic motor, so that the pipe connection simple, not only reduces the installation space, but also reduces the leakage and pipe vibration caused by a pipeline connection, to improve the reliability of the system, the hydraulic motor repair, simplified procedure. Production (2) charge system not only ensures the main pump displacement is changed in response to displacement drive to improve the operating frequency of the system, but also increase the main pump pressure at the inlet to prevent large volume cavitation, can effectively improve the speed of the pump and prevent pump cavitation, improve work life; fill the oil system equipped with filters, hydraulic motor testing, improve the reliability and service life of the actuator; in addition, the charge pump also convenient for a number of low-pressure auxiliary institutions to provide power. (3) Since only a small amount of oil drawn from the tank, reducing the loss of the fuel tank. Hydraulic motor maintenance, crystal creating a hydraulic factory outlets (certified), a hydraulic motor provided by the Jinan Jing Chong Hydraulic Machinery Co., Ltd .. 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 creating hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal creating hydraulic better future.