【 Doosan 220-7 Second-hand Excavator This second-hand Doosan 220-7 excavator has a total working time of 49,000 hours and is a highly efficient device that has been proven by the market. Its power system is equipped with a well-tested Cummins 6-cylinder turbocharged diesel engine, which features strong power output and smooth operation characteristics. Even under high-load working conditions, it can maintain stable performance. This model is equipped with advanced electronic fuel injection technology, which not only enhances fuel efficiency but also effectively reduces emissions, meeting current environmental protection requirements. In terms of the hydraulic system, Doosan 220-7 adopts an advanced negative flow control system, which can automatically adjust the pump's displacement according to actual operational requirements, thereby achieving more precise and rapid action responses. This design not only enhances work efficiency but also reduces energy loss and prolongs the service life of the machine. In addition, this machine has particularly strengthened the protective measures for key components such as the main pump and control valves to ensure reliability and durability even under long-term and high-intensity use. As a medium2025-12-02 09:47:47