Doosan’s new 50 tonners
By Lindsay Gale13 June 2013
Doosan has introduced two new Tier 4 Interim/Stage IIIB compliant 50 tonne class tracked excavators - the 49 tonne DX490LC-3 (first seen at bauma) and the 52 tonne DX530LC-3. According to Doosan, the design of these two new units is such that they are eminently suitable for heavy duty work such as large-scale earth and rock moving, demolition, secondary breaking and loading duties.
The DX490LC-3 weighs in at 49 tonnes, with a digging depth of 7.8 m (25.6 ft), a dig reach of 12.1 m (39.7 ft) and a dig height of 11.1 m (36.4 ft). The corresponding figures for the 52 tonne DX530LC-3 are a dig depth of 6.8 (22.3 ft), reach of 10.8 m (35.4 ft) and height of 9.7 m (31.8ft). Both machines are powered by a 6 cylinder Isuzu AL-6WG1X engine delivering 290 kW (389 hp) that delivers 16% more power, a 30% increase in displacement and a 41-50% increase in engine torque compared to the previous DX480LC and DX520LC..
According to Doosan, the DX490LC-3 is a powerful machine with extra reach and stability to allow it to achieve long cycles and heavy pulling work. A wider undercarriage on the larger machine provides it with excellent stability and a high lifting capacity. Both feature new hydraulic pumps and valves that increase digging force by 3-6% and lift capacity at ground level is up by 5.5% for the DX490LC and 9% for the DX530LC. New travel and swing components provide an increase in drawbar pull of 15% for both machines to 38,800 kg (85,360 lb), swing torque is also up 23% to 15,880 kg.m (115,000 lb.ft) and travel speed is up 10% to 5.5 km/h (3.4 mph).