01 June 2013

DOOSAN Infracore Construction Equipment has launched the new-generation DL550 wheel loader as well as two 50-tonne excavators for the Middle East and Africa (MEA) region.

The DL550 is the top-of-the-range model in the company’s new family of wheel loaders intended for markets in the region.

With a bucket capacity of 5.4 cu m, the DL550 wheel loader is designed to meet a wide range of material-handling needs, from loading and transporting granular material (such as sand and gravel) to industrial, mining and quarrying applications.

A key feature of the new DL550, according to a company spokesman, is the Tier Two 12.7-litre Scania DC13 turbo-charged, air-to-air intercooled diesel engine, which is ideal for use in the MEA region, delivering ‘best in class’ power with a maximum output of 294 kW at 2,100 rpm.

“The high engine power output is combined with new ZF transmissions and several other features which, in addition to reducing fuel consumption, provide exceptional performance, high durability, ease of handling and serviceability, and significantly enhanced operator comfort,” he says.

The new wheel loader has 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 new ZF transmission improves the transfer of power from the engine to the wheels and contributes significantly to the overall reduction in fuel consumption. It also provides better response and acceleration, especially on slopes. A five-gear transmission with torque convertor lock up is available as an option.

“When activated, the optional torque-converter-cut-off (TCCO) system is switched on automatically. This provides a direct mechanical connection between the engine and transmission without loss of power and torque by the torque converter. Tests show that fuel consumption can be reduced by as much as 10 per cent,” says the spokesman.

With the intelligent clutch cut-off system engaged, the driver is able to disconnect the transmission from the engine by operating the brake pedal, to have 100 per cent engine performance for the hydraulic system. As a result, movements are faster, breakout force is maximised and fuel consumption is reduced.

New ZF Type II axles provide more durability and a longer lifetime. The axles have a hydraulic differential lock as standard.

Like all new-generation Doosan large wheel loaders, the DL550 is equipped with load-sensing closed centre controlled, variable hydraulic piston pumps, improving performance and reducing fuel consumption. With load sensing, the hydraulic pumps receive a signal from the main control valve (MCV) informing how much oil is needed. This helps to improve engine performance and reduce fuel consumption.

A new cab design features improvements both outside as well as inside. The control panel has been redesigned to allow the operator to choose the information he wants on the display.

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 70 bar, with a corresponding increase in breakout and lifting forces.

 

Excavators

The launch of the 48-tonne DX480LCA and 51-tonne DX520LCA large crawler excavators marks the latest phase in the launch of the new LCA generation of Doosan crawler excavators for the MEA region replacing the previous Solar range. The programme, which began in 2012 with the introduction of the new DX225LCA, DX300LCA and DX340LCA models, is due to be completed by the end of this year.

The new excavators are designed to be leaders in their respective weight classes. “The DX480LCA model is a very powerful machine with extra reach and stability, allowing it to accomplish long cycles and heavy pulling work with ease,” he says. “The DX520LCA model, on the other hand, offers exceptional stability and unmatched lifting capabilities. This is a mass excavation machine fitted with an extra heavy counterweight and a short front end to deliver more breakout force for really tough digging jobs.”

Both new excavators are powered by the Doosan DE12TIS six-cylinder air-to-air intercooler Tier Two-compliant diesel engine with a displacement of 11 litres, developing 318 hp of power at 2,000 rpm using a mechanical injection system. “The latter ensures the engine provides both maximum power and greater torque, whilst at the same time reducing emissions. Owing to the incorporation of a new travel motor, both machines deliver a massive tractive effort of 37.6 tonne. Bucket and dipper stick breakout forces have also increased, together with a significant increase in the hydraulic flow from the pumps,” he says.

Replacing the previous Solar range machines, all the LCA new-generation machines share a common design particularly suited to the specific needs of the MEA markets, combining high robustness with a number of important new functionalities and technical improvements, including Doosan Tier Two-compliant engines; top-quality materials and components; ergonomically designed cab; limited electronics; and an unmatched combination of strength, stability and versatility.

The operating weight of the new DX480LCA excavator varies from 48.4 to 50.2 tonnes, depending on the configuration while that for the DX520LCA varies from 51.1 to 52.9 tonnes.

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