CVT design offers fuel-saving opportunities on new Doosan loader

AS part of Doosan’s DL-7 series, the manufacturer has unveiled the new DL420CVT-7 Stage V-compliant wheel loader equipped with a Continuously Variable Transmission (CVT).

Boasting a maximum bucket capacity of 4.5 m3, the model is intended to meet a range of material-handling needs from loading and transporting granular material to quarrying, mining, construction, demolition, industrial, waste and recycling applications.

Doosan explained the CVT design combines the benefits of a hydraulic mechanical transmission and a hydrostatic transmission in one machine. It allows the DL420CVT-7 to automatically transition from hydrostatic power at low speed to the mechanical system to operate at higher speeds.

By combining the two types of transmission, Doosan added that the CVT technology ensures high loads can be carried at low engine speeds with high dynamics for an optimum wheel loader operating cycle. With the CVT, Doosan claimed a fuel saving of up to 15% can be achieved.

With an output of 240 kW (326 HP) of power at 1800 RPM, the Scania DC09 engine meets Stage V emission regulations without the need for exhaust gas recirculation (EGR), through the use of selective catalyst reduction, diesel oxidation catalyst and diesel particulate filter (DPF) after-treatment technologies.

The machine features the same external design common to all models in the DL-7 series. It won Germany’s 2020 iF Design Award and the ‘Best of the Best’ category in the Korean PIN UP Design Awards.

The new cab has a 14% larger glass window area compared to the previous DL-5 model. The loader also offers the option of electrically adjustable rear view mirrors. Full LED working lights are installed (four on both the front and rear as standard, with the option of six each at the front and rear). An air compressor with air blower is available as an option.

Inside the cab, the DL420CVT-7 utilises the new Doosan Smart Key system and has a Grammer Actimo XXL seat with adjustable horizontal and vertical suspension settings, a pneumatic lumbar function and seat heating as standard.

The EMCV (Electric Main Control Valve) joystick is fully integrated in the armrest. Features available via the EMCV system include Automatic Return-to-Dig, Bucket Tilt Kick-out and the Bucket crowd stop position and shock prevention.