Following are some basic working principle of Hydraulic Excavator:

Hydraulic pump drive system through the power of the engine is transmitted to the hydraulic motors, hydraulic cylinders and other actuators, action to promote the work means to complete a variety of jobs. Site to use more PV-200 type hydraulic excavator as an example. The machine uses a modified open-center load sensing system (OLSS). The system is used to control the swash plate type variable piston pump swash plate angle (output flow) method of reducing the power output of the engine, thereby reducing fuel consumption, it is an energy-saving system.

Hydraulic characteristics of this system are: constant torque control, pump drive torque can be maintained unchanged, set off control, can reduce the loss of a job unloading time; quantity control can reduce the neutral and fine-tuning control of the hydraulic pump output flow, reduce power losses.