Doosan Infracore has launched its flagship model, the DX800LC, in Korea. The largest machine in Doosan’s excavator lineup, the 80-ton DX800LC is more than thirteen times larger than the company’s DX55-5K 5-ton excavator, the top seller in the Korean market, while its bucket capacity (4.64 m3) is almost twenty-seven times that of the DX55-5K (0.175 m3).
The DX800LC features all of the company’s latest technologies. It was selected as one of ‘Top-15 Industrial Technology Achievements in 2019’ by the National Academy of Engineering of Korea, a recognition awarded to the country’s most outstanding products of the year in terms of industrial technology.
Equipped with ‘Smart Power Control,’ an electronic integrated hydraulic system developed by Doosan Infracore, the DX800LC excavator distributes the optimum hydraulic pressure according to the needs of each operating part and minimizes unnecessary hydraulic operation while waiting for work.
The DX800LC-7 Stage V compliant model is powered by the Perkins 2506J diesel engine, providing a power output of 403 kW (548 HP). The engine meets Stage V emission regulations by utilising exhaust gas recirculation, selective catalyst reduction, diesel oxidation catalyst and diesel particulate filter (DPF) after-treatment technologies. The DPF automatically regenerates every 25 hours and the excavator continues to work unaffected during this regeneration phase. The operator can check the status of the DPF via the display on the gauge panel in the cab.
The high output of the engine is combined with a virtual bleed off (VBO) hydraulic system (D-EcoPower+), providing a best-in-class hydraulic flow of 1008 l/min and a high system pressure of 343 bar, together contributing to the best performance in the 80 tonne market.
Doosan’s D-EcoPower+ technology utilises an electronic pressure-controlled pump within a closed centre hydraulic system to optimise productivity and fuel consumption, depending on the mode selected. A closed centred main control valve minimises pressure loss, while the electric pressure-controlled pump manages and optimises engine power more effectively. Software is utilised to electronically reproduce the full benefits of an open centre hydraulic system with very little energy loss. The hydraulic system and engine output are fully optimised and synchronised, further reducing losses within the system.
Improved feedback to the operator through the joystick results in improved machine control and less operator fatigue. The acceleration and deceleration of the excavator workgroup functions are smoother, allowing operators to perform repetitive swinging and digging motions with less jerking movements.
In terms of durability and safety, the large excavator has adopted a host of new technologies including an intelligent boom function that mitigates impacts on the equipment, and an all-around view monitoring (AVM) system that provides the operator with a 360° field of vision at a glance.
The global market for ultra-large excavators including the 80-ton model is estimated to be around 1,000 units per year, with the majority of customers engaged in the mining of raw materials such as coal and gold. In the three years since it was launched in China and emerging markets, the DX800LC has proven its competitiveness with consistent sales growth. Following the launch of the Korean model on the local market, Doosan Infracore plans to introduce the new excavator in Europe and North America, customized for their respective needs.