New Doosan products on display at Intermat 2012

New generation excavators and wheel loaders to be launched at Intermat

At Intermat 2012, Doosan Infracore Construction Equipment are launching a host of new products including the company’s first Stage IIIB compliant excavators and wheel loaders. 

The first new generation crawler excavators include the DX300LC-3 and DX340LC-3 heavy models and the DX180LC-3 mid-range model. Intermat will also see the launch of the new generation DL300-3, DL350-3, DL420-3, DL450-3 and DL550-3 large wheel loaders and the new DL200-3 mid-size wheel loader. These will be shown alongside the company’s new DA30 and DA40 articulated dumptrucks, also being seen for the first time at the Intermat show.  

Powered by Scania Selective Catalytic Reduction (SCR) or Doosan Exhaust Gas Recirculation (EGR) diesel engines meeting the Stage IIIB EU emissions regulations, the new excavators and wheel loaders combine high engine power output with new transmissions and several other features to minimize fuel consumption and provide exceptional performance, ease of handling, serviceability, durability and significantly enhanced operator comfort.

Excavators

In the new generation excavators, the ROPS and OPG certified cab offers more space (+6%) for the operator and several convenient features, including direct control through joysticks, which have new proportional thumb wheel switches and integrated buttons to provide precise, proportional control of attachments. 

A new 7in colour high-quality visual control console offers an attractive display and excellent functionality. All functions can be controlled both from the instrument panel as well as via a new jog/shuttle control next to the joystick, a feature exclusive to Doosan excavators. A new function allowing the operator to select and set engine speed, hydraulic flow and pressure for attachments, with several preset positions, is a standard feature. 

A new ECO gauge on the control panel helps the operator to lower fuel consumption by providing real time monitoring of fuel rate and actual engine-percent load. Two new operating modes (P+ mode: Power Plus and L: Lifting) improve controllability and efficiency. Factory tests show a 5-10% reduction in fuel consumption, depending on the operating mode selected and the work being done. 

New hydraulic pumps and valves increase hydraulic flow by up to 11% and pressure (350-370 bar) to boost front, travel and power functions as well as increase lifting capabilities and reduce cycle times. Overall, the new hydraulic system improves the productivity of the machines through highly responsive controls. 

At 159kW, the Doosan DL08K engine in the DX300LC-3 excavator delivers 2% more power at a lower speed of 1,800 rev/min than the existing DX300LC Stage IIIA model. Compared to the DX340LC, the engine in the new DX340LC-3 delivers 210kW, a 7% increase in power at a low 1,800 rev/min.

Workload/hour outputs have increased by an average of 6% and 17% across the different power modes in the DX300LC-3 and DX340LC-3, respectively. In the DX300LC-3, a new travel device has increased the maximum travel speed to 5.3km/h, while the drawbar pull is increased by 4% to 29,800kg and lifting capacities have been increased by 6%. The same travel device has increased the maximum travel speed of the DX340LC-3 by 13% to 5.4km/h and produced a 16% increase in the drawbar pull to 32,200kg. 

The DX180LC-3 excavator is powered by the Doosan DL06 six-cylinder turbocharged diesel engine meeting Stage IIIB engine emission regulations through the use of EGR and Diesel Particulate Filter (DPF) after-treatment technologies. The DL06 engine runs at 1,950 rev/min and delivers 3% more power [91.2kW (SAE J1349)] and 15% more torque (54 kgfm) than the engine in the existing Stage IIIA model. 

Wheel loaders

The new generation DL300-3, DL350-3, DL420-3, DL450-3 and DL550-3 large wheel loaders have bucket capacities ranging from 3.0m3 to 5.5m3. The DL300-3 and DL350-3 wheel loaders are driven by the 9-litre Scania DC09 SCR five-cylinder diesel engine delivering a maximum power output of 202kW at 1,800 rev/min, whilst the DL420-3, DL450-3 and DL550-3 models are powered by the larger 13-litre Scania DC13 SCR six-cylinder diesel engine delivering ‘best in class’ power and engine torque, with maximum power outputs of 264kW, 264kW and 283kW at 1,800 rev/min, respectively. Powered by the Doosan DL06 EGR diesel engine delivering 118kW at 2,100 rev/min, the new mid-size DL200-3 wheel loader has a bucket capacity of 2m3.

The new wheel loaders have three engine working modes: ECO, NORMAL and POWER, to adapt the machine to different applications, with different engine speeds and gear steps according to the working mode engaged. The ECO bar provides information about fuel consumption in relation to machine performance in real-time, allowing the operator to select the driving profile for the best fuel efficiency.

All new generation Doosan wheel loaders are equipped with load-sensing controlled, variable hydraulic piston pumps, improving performance and reducing fuel consumption. With load sensing, the hydraulic pumps receive a signal from the MCV informing how much oil is needed. This helps to save on engine performance.

The new ZF limited-slip Type II differential axles provide more durability and a longer lifetime. Rolling resistance for the axles is reduced, improving traction and decreasing fuel consumption. 

A new cab design features improvements both outside – such as better visibility due to a wider front glass section and an extended wiper blade area, better protection thanks to larger mud guards, improved hand rail and step designs and a new roof cover - as well as inside – such as the new instrument panel with integrated vehicle control unit (VCU). The new wheel loaders will have Grammer seats, which are vertically as well as horizontally air suspended. This design, which cushions movements to the front and the rear, is recommended by orthopaedic consultants and is well accepted by operators.

New kinematics and a larger cylinder on the lift arm have allowed the main pressure in the front hydraulic system to be increased by up to 40-70 bar, depending on the machine size, with a corresponding increase in breakout and lifting forces of up to 5%.

Articulated dumptrucks

Powered by the six-cylinder Scania DC13 SCR Stage IIIB compliant diesel engine with a gross power output of 368kW (500hp) at 2,100 rev/min, the new DA40 articulated dumptruck (ADT) offers a 10% increase in engine power compared to the previous MT41 model. With a 22% increase in gross torque to 2,373Nm (1,750 lb ft) at 1,300 rev/min, the torque available in the DA40 is ‘best in class’ in the ADT market. 

The increased engine power is combined with SCR technology to lower fuel consumption. Also contributing to the overall 8% reduction in fuel consumption is the new ZF transmission offering eight forward and four reverse speeds. The new transmission improves the transfer of power from the engine to the wheels for outstanding traction. To withstand the increased power, the driveline dimensions and cooling capacity of the truck have been increased.

The DA40 combines ‘best-in-class’ fuel consumption with a higher top speed of 58km/h (36 miles/h). The DA40 also has an increased body capacity of 24.4m³, and the payload has been boosted to 40 tonnes without tailgate, an increase of more than 15% over the payload of the MT41. The higher speeds and payloads will allow the customer to increase profits from their mining, quarrying or earthmoving operations.

Building on the success of the popular MT31 model which it replaces, the new Doosan DA30 ADT, which has a payload of 28 tonnes, offers many new features in common with the new DA40 to meet customer demands for increased power and performance, easier operation, increased fuel efficiency, enhanced driver comfort and faster travel speeds. 

Driven by the five-cylinder Scania DC9 Stage IIIB compliant diesel engine with a gross power output of 276kW (375hp), the DA30 offers an 8% increase in engine power compared to the MT31. In combination with the greater engine power, the DA30 also has 30% more gross torque (1,873Nm at 1,300 rev/min), to produce the powerful rim pull required to work in extreme hauling conditions.