GRH supplies a large number of small and medium-sized excavators and special mini excavators with gear pumps, and valves. Guorui hydraulic gear pump can be equipped with main pump, charge pump and pilot pump for its high efficiency. The hydraulic control valve with load-sensing, post compensated proportional control valve are used for the flow control of excavator operations. ?Due to its high efficiency, GRH gear motor or orbital motro can meet the requirements of the harsh cooling system to drive the fan .