Achieved by the injection molding machine hydraulic system to the pump control valve controlled pump maintenance shift, so the conventional throttle speed control system into a proportional speed control system, control performance machine with new improvements and enhancements. Specifically, the proportion of variable displacement pump system in addition to the advantages of the conventional proportional control system, but also has the following advantages: the same power of the machine, the injection speed can be increased by more than 25% of the hydraulic pump maintenance, better adapted to the requirements of thin-walled precision injection. Since ordinary PQ system power calculations to dwell state standards, the proportion of variable pump system at the time of this operation is very low power consumption, and thus pump displacement can increase more than 25%; reduce system heat, extend the service life of hydraulic components. Almost no throttling proportional variable system, overflow losses, the system is running fever greatly reduced. Not only can save the consumption of cooling water pump sales, lower oil temperature of the sealing element life is greatly improved; the energy consumption is reduced, system efficiency; L6V107HD1DFZ20700 used XCMG (heavy) truck crane Special Note 1. Before the appliance is running, the pump must be guaranteed, full motor and hydraulic oil systems in each pipeline, otherwise it will cause damage to the product due to poor lubrication; 2. Host hydraulic system fluid cleanliness is not less than the ISO4406 19/16 level, otherwise it will cause product failure manipulation, or even damage; 3. must reasonable set of tanks and chiller systems to ensure maximum system oil temperature does not exceed 80 ℃. Letter Users: In order to extend the life of your users to be: (1) shall be kept for any occasion cleanliness of hydraulic oil; (2) the periodic replacement of the hydraulic oil (working 1000-3000 hours, or six) hydraulic pump repair _ crystal Year hydraulic (certified) _ pump is provided by Jinan Jing Chong Hydraulic Machinery Co., 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.