Is the main pump of the concrete pump electric control or hydraulic control?
The main pump behind the oil pump to provide the size of the oil with the greater the current the higher the higher the higher the displacement,
Closed main oil pump behind the charge pump to provide a constant pressure to the displacement of the electromagnet by the current control output pressure to achieve the main pump pressure and pumping the commutation.
General Separated and Closed Open Electromagnet Control Displacement (Current)
