Doosan launch new DL420CVT-7 wheel loader

New model in award-winning DL-7 series features fuel-saving continuously variable transmission system

AS part of the company’s award-winning DL-7 series, Doosan have launched the new DL420CVT-7 Stage V compliant wheel loader equipped with a continuously variable transmission (CVT). With a maximum bucket capacity of 4.5 cubic metres, the 24-tonne DL420CVT-7 is intended to meet a wide range of material-handling needs in quarrying, mining, construction, demolition, industrial, waste and recycling applications.

The CVT design combines the benefits of a hydraulic mechanical transmission and a hydrostatic transmission for smooth and continuous speed variation, allowing the DL420CVT-7 to automatically transition from hydrostatic power at low speed to the mechanical system at higher speeds.

For most tasks, operators will utilize the hydrostatic part of the transmission, which offers greater fuel efficiency in low-speed applications and provides an increase in machine performance for operators working in digging, loading and lifting applications. The combination of the two transmissions is automatic and fully transparent for the operator.

The complete driving range, forward and reverse, is controlled by the CVT system. 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% can be achieved.

With a power output of 240kW (326hp) at 1,800 rev/min, the Scania DC09 engine in the DL420CVT-7 meets Stage V emission regulations, without the need for exhaust gas recirculation (EGR), by using selective catalyst reduction, diesel oxidation catalyst and diesel particulate filter (DPF) after-treatment technologies.

The soot cleaning cycle on the DPF has been improved to more than 6,000 hours and the operator is fully informed about the status of the DPF via a soot level indicator on the new touchscreen display in the cab.

The new DL420CVT-7 features the same external design common to all models in the DL-7 series, which has already received much acclaim globally, winning Germany’s 2020 iF Design Award, one of the world’s top three design awards, and the ‘Best of the Best’ category in the Korean PIN UP Design Awards.

The Z-kinematic lift arm on the DL420CVT-7 delivers high breakout forces (up to 171kN) and lifting capacities (18,696kg). An optional high-lift arm is available where higher dump heights and increased versatility are required.

Like all DL-7 wheel loaders, the DL420CVT-7 has smooth, responsive hydraulics and auxiliary hydraulic connections. Various bias and radial tyre options are also available from leading global manufacturers, to cover the widest possible range of conditions and applications. In addition, the new wheel loader can be ordered with a heavier optional counterweight, depending on the application.

The new cab on the DL420CVT-7 offers a greatly improved field of vision for the operator, with blind spots around the cab minimized and a 14% larger glass window area compared with the previous DL-5 model. The DL420CVT-7 also offers the option of electrically adjustable rear-view mirrors for added safety.

Full LED working lights are installed on the cab (four on both the front and rear as standard, with the option of six each at the front and rear). For greater pedestrian safety, the LED lights on the rear bonnet have an automatic strobe function to indicate when the wheel loader is reversing.

The new cab has a Grammer Actimo XXL seat with fully adjustable horizontal and vertical suspension settings, a pneumatic lumbar function and seat heating as standard. There is a three-point safety belt with alarm icons on the new Doosan Smart Touch 8in touchscreen monitor and on the gauge panel, which features a new layout and anti-reflective glass.

The new electric main control valve (EMCV) joystick fully integrated in the armrest is another standard feature in the cab, providing the operator with smoother and precise controllability of the lift arm and attachments on the wheel loader.

Designed to give the operator more precise control with a shorter lever stroke, resulting in less fatigue, the sensitivity of the ergonomic joystick control can be set and altered according to operator preferences using the new Doosan Smart Touch touchscreen monitor. User-friendly and easy to read in all conditions, the new touchscreen provides all the important settings and information the operator needs in one place.

Included in the information at the operator’s fingertips on the touchscreen is the feed from the rear-view camera, the weighing system, the HVAC controls (heating, ventilation and air-conditioning), radio and Bluetooth devices (music streaming, hands-free etc) and the operator help function.

The LIS (Load Isolation System) provides a smoother ride and greater comfort for the operator, as well as higher productivity due to improved stability when the wheel loader is moving. The lift arm is cushioned by a hydro-pneumatic accumulator linked to the lift hydraulic system, acting as a shock absorber. Benefits include reduced cycle times, higher performance and better fuel efficiency while carrying out load-and-carry applications.

With heavy-duty HDL axles as standard and enhanced traction with differential hydraulic lock (DHL), the DL420CV-7 wheel loader is said to operate particularly well in high-load environments. The differential hydraulic 100% lock can be engaged at full torque automatically without any action from the operator.

Optional independent oil cooler circuits for the front and rear axle ensure low oil temperatures, provide oil filtration and extend the lifetime of axle components, especially for demanding applications such as long-distance load and carry operations in high ambient temperature conditions.

Improvements have been made throughout the powertrain, to provide operators with best-in-class driveability and the ability to reach the 38km/h maximum speed quickly and safely.

The upgraded hydraulic system and major parts ensure greatly improved durability and maintainability. Providing increased peace of mind for the customer, the high reliability and quality of the new DL420CVT-7 wheel loader is backed up by a standard full three-year/5,000-hour warranty.

The DL420CVT-7 wheel loader is factory-installed with the latest DoosanCONNECT TMS2.0 state-of-art, dual mode (satellite, mobile network), wireless fleet-monitoring system, providing comprehensive information which is very useful for managing the performance and security of machines and promoting preventative maintenance.