Doosan introduces CVT technology to its wheel loaders


Doosan has launched its first wheel loader equipped with a continuously variable transmission (CVT).

The DL420CVT-5 vehicle’s transmission combines the benefits of a mechanical transmission and a hydrostatic transmission in the same machine, allowing the wheel loader to automatically transition from hydrostatic power at low vehicle speed to the mechanical system to operate at higher speeds.

The CVT design provides a smooth, continuous speed variation and ensures high loads can be carried at low engine speeds with high dynamics, for an optimum wheel loader operating cycle – contributing to a 15% reduction in fuel consumption.

The vehicle is Stage IV compliant, and its use of cooled exhaust gas recirculation and selective catalytic reduction aftertreatment systems means that it does not require a diesel particulate filter. Equipped with a Scania DC09 engine, the unit provides 232kW (311hp) of power at 1,800rpm, while an auto idle feature which cuts the cut the idle level from 950 to 850rpm brings substantial fuel savings during down-time.

With a maximum bucket capacity of 4.2m3, the DL420CVT-5 is intended to meet a wide range of material-handling needs, from loading and transporting granular material (such as sand and gravel) to industrial, construction, demolition, mining and quarrying applications.

A Doosan spokesman, said, “The breakout force and high traction allow the DL420CVT-5 to tackle the hardest materials, with a powerful hydraulic system that ensures that work is quick and efficient.

“Combined with the power provided by the Scania DC09 engine, these features give the

DL420CVT-5 excellent penetration power, ensuring an optimum bucket load in each cycle.”

Joystick control on the DL420CVT-5 is designed to easily combine several movements at the same time. As an option, 3-lever fingertip control can be provided for smooth control. Both controls use electrohydraulic piloting.

The machine has a boom kick-out function as standard, useful when working in confined spaces or when repeating similar operations in specific work ranges (for example, when a certain dump height must be reached every day). The same system is used to set the

bucket automatically to the return-to-dig position.

The LIS (Load Isolation System) provides the operator with a smoother ride over rough terrain and enables a more comfortable ride at higher speeds. The benefits include reduced cycle times, higher productivity and better fuel efficiency while performing load and carry applications. LIS also contributes to longer frame and machine life.

The new loader also offers a ‘third function’ to power a hydraulic system on a work tool, allowing greater machine versatility in a number of applications. The third function valve’s capacity has been increased significantly to at least 250 l/min.

Doosan has also installed an automatic greasing system as standard, to reduce working time and increase operating comfort. To facilitate access and mobility on the machine, multiple

hand-rails ensure that the operator always has a firm support to hold on to.

The cooling compartment is separated from the engine compartment, to prevent warm and dusty air from entering and to allow better control of the air intake.

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Tom Stone is Editor of the iVT brand – which includes digital and print editions of a quarterly magazine and the Advanced Lift-truck supplement, as well as, which is updated daily. Tom has met and interviewed some of the world's leading industrial vehicle OEM presidents, CEOs and MDs, and takes great pride in cementing iVT's place as the leading forum for debate within the industry, a reputation that his been built up over the brand's 25-year history.

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