Doosan launches new, heavier 42 tonne class tracked excavator
By Lindsay Gale06 February 2013
Doosan has taken the wraps of its latest 42 tonne tracked excavator, the Stage IIIB/Tier 4 Interim compliant DX420LC-3, which the company says is more powerful than the model it replaces, leading to increases in drawbar pull, arm and bucket digging forces, and lifting capacities.
Power comes from an Isuzu AL-6UZ1X common rail six cylinder turbocharged diesel that makes use of Exhaust gas recirculation (EGR) and Diesel Particulate Filter (DPF) after treatment systems to comply with the legislation. At 270 kW (362 hp) at 2,000 rpm, this engine delivers 19% more power and 6% more engine torque than its predecessor. The machine features a new travel device that contributes to the 10% increase in drawbar pull, 5% increase in swing torque and a 10% increase in travel speed.
The use of new hydraulic pumps and valves has increased main pump flow by 6% to provide a combination of higher overall pressures and hydraulic flow for improved comfort, travelling performance, smoothness, power and improved attachment work, says Doosan
A feature of the machine is its new ROPS and OPG certified cab that offers more space for the operator. Machine control is via joysticks, which have new proportional thumb wheel switches and integrated buttons to provide precise proportional control of attachments.
Doosan has upped the weight of the machine by a tonne to 41,900 kg (92,180 lb) and added 200 kg (440 lb) to the counterweight, with the heavy duty undercarriage featuring reinforced track links, track springs, sprockets and bushes. The result, claims Doosan, is a significant extension to the machine’s service life.