ACCUMULATOR MANAGEMENT
Effectively managing the activity of an accumulator in a hydraulic system can improve the efficiency and safety of the system. A hydraulic system includes a variable displacement pump and a hydraulic transformer. The hydraulic transformer includes an output shaft mechanically connected to a working load. The working load is a swing gearbox for an excavator. The hydraulic system also includes an accumulator fluidly connected to the pump by a pump line. The accumulator is also fluidly connected to the hydraulic transformer by a transformer line. The hydraulic system further includes a pre-charge valve positioned on the pump line between the accumulator and the pump. Fluid passes to the accumulator from the pump through the pre-charge valve along the pump line when the pump is first powered on.