Doosan launch new Stage IIIB-compliant crawler excavators

Latest excavator models offer more productivity and fuel-efficiency for heavy-duty work

DOOSAN Construction Equipment have launched two new, large Stage IIIB-compliant crawler excavators in the increasingly important 50-tonne class: the 49-tonne DX490LC-3 (pictured); and the 52-tonne DX530LC-3.

Both new models offer the strength and productivity needed for heavy-duty work, such as large-scale earthmoving, secondary breaking and loading haulers often found on quarrying and mining projects.

The new DX490LC-3 and DX530LC-3 excavators are designed to be leaders in their respective weight classes. The DX490LC-3 model is a very powerful machine with extra reach and stability allowing it to accomplish long cycles and heavy pulling work with ease. The wider undercarriage on the DX530LC-3 model delivers exceptional stability and lifting capabilities. This is a mass excavation machine fitted with an extra heavy counterweight and a short front-end to provide more breakout force and tackle every tough digging job.

To power the new excavators, Doosan have chosen the well-proven Isuzu AL-6WG1X common rail, variable geometry turbocharged, six-cylinder diesel engine that utilizes exhaust gas recirculation (EGR) and diesel particulate filter (DPF) technologies to meet Stage IIIB regulations. The new Isuzu engine provides 16% more power (389hp at 1,800 rev/min), a 30% rise in displacement and a significant 41-50% increase in engine torque, compared with the previous DX480LC and DX520LC models.  

New hydraulic pumps and valves have also increased digging forces by 3-6%, making both excavator models the best in their class.  In the DX490LC-3 model, lifting capacities at ground level have increased by 5.5%, and by up to 9% in the DX530LC-3 excavator.

Both machines are equipped with an e-EPOS electronic control system that provides optimum power with improved fuel efficiency in all working operations. Also featured are two new operating modes – Power Plus and Lifting. 

The overall reduction in fuel consumption has been achieved by a combination of improved cooling efficiency; an ECO gauge to provide fuel consumption guidance for the operator; enhanced main control valves, which reduce loss of energy and increase efficiency; and additional sensors for improved electronic management of pump/engine/mcv, allowing a more efficient selection of flow/pressure/rpm according to load requirements.