The excavator is driven by the engine work pump, pump into the pump and pump, and then by the operation of the hydraulic excavator driver rod of the hydraulic oil distribution to the pilot valve and main control valve,such as thehydraulic oil distribution to the main control valve, hydraulic oil through the delivery of the main control valve toarm; small arms; dig bucket cylinder, and then drive arm; small arms; the bucket excavation. Ifthe hydraulic oil will be allocated to the pilot valve, hydraulic oil to drive the motor through the pilot valve torotate and the running state of excavator.
