Doosan has launched the new DL420CVT-5 Stage IV compliant wheel loader, the first model in the Doosan wheel loader range to be equipped with a Continuously Variable Transmission (CVT)
The CVT design combines the benefits of a mechanical transmission and a hydrostatic transmission in the same machine. It allows the DL420CVT-5 to automatically transition from hydrostatic power at low speed to the mechanical system to operate at higher speeds.
The driving range, in forwards and in reverse, is controlled by the CVT system. The low engine speeds ensure a high efficiency and the highest driving comfort irrespective of the traction speed. The power splitting continuously variable technology facilitates moving off softly and hydraulically. Furthermore, with the CVT, a fuel saving of up to 15 per cent can be achieved.
The ability to split hydrostatic and mechanical power has allowed Doosan to move to the Scania DC09 engine in the DL420CVT-5, as the CVT system maintains the machine’s efficiency even at low engine rpm. With an output of 232 kW at 1800 rpm, the Scania DC09 engine provides generous torque at low rpm and meets Stage IV emission regulations without the need of a diesel particulate filter.
As with all Doosan Stage IV wheel loaders, operators can select between several driving modes that adjust the maximum engine rpm based on the operator’s preference and the application.
Digging mode - this mode is available below 3 km/h and by pressing a button, the machine exerts the maximum torque to the transmission to ensure the best performance.
Drive mode - when the machine travels forward at over 14 km/h, with the front pressure stabilised, the loader recognises that the task is driving only and thus shifts automatically into the Drive mode to ensure the best traction and decrease the fuel consumption.
With a maximum bucket capacity of 4.2 m3, the new Doosan DL420CVT-5 wheel loader is intended to meet a range of material-handling needs from loading and transporting granular material to industrial, construction, demolition, mining and quarrying applications.
All new generation Doosan wheel loaders have a load sensing hydraulic pumping system, whereby the variable axial piston pump generates the flow upon demand in the amount necessary to perform the work. This also gives better traction for penetrating into the stockpile, as less force is necessary to operate the bucket in many situations.
