HYDRAULIC SYSTEM

A hydraulic system according to an embodiment of the present invention comprises: a variable capacity-type hydraulic pump that discharges hydraulic oil and includes an inclined plate; an swash plate angle sensor for measuring the angle of the inclined plate; an swash plate driving piston for moving the inclined plate of the hydraulic pump in response to changes in pressure applied to a large diameter section; an swash plate control hydraulic line for supplying the large diameter section with a portion of the hydraulic oil discharged by the hydraulic pump; a control valve that is installed on the swash plate control hydraulic line and controls the flow rate of the hydraulic oil that is supplied to the large diameter section or discharged from the large diameter section; an electro-proportional pressure reducing valve for producing pilot pressure that is to be transmitted to one side of the control valve; an operation device for generating an operation signal; and a control device for controlling the electro-proportional pressure reducing valve according to the operation signal of the operation device and the angle information from the swash plate angle sensor.