The GPC4 series gear pumps are high-pressure external toothing gear pump introduced from VICKERS in the USA. The maximum working pressure is up to 25MPa, the output volume is between 20 and 80ml/r, and the rotary speed ranges from 700 to 3000/min. These pumps adopt the front cover, pump body and rear cover formed through the extrusion of high strength aluminum alloy, and the floating side plate with compensating axial clearance and DU bearing structure with high bearing capacity. It has the characteristics of high pressure, wide speed range, high volumetric efficiency, reliable operation, light weight and long service life. There are eight kinds of connection of metric and British system for GPC4 series pump shaft extension, and there are four connections of metric and British system for flange seal, which can also form single pump, duplex pump, triple pump and quadruple pump. It is mainly used in hydraulic system of construction machinery, mining machinery and hoisting and transporting machinery. After years of batch production and continuous improvement, it has become a leading product of the company. Besides, it is widely used in construction machinery, mining machinery and hoisting and transporting machinery, as well as large and medium-sized hydraulic systems, especially in the accessories maintenance of imported construction machinery, mining machinery, hoisting and transporting machinery as well as imported or domestic hydraulic systems.