CUTTING EDGE
New generation wheel loader hits market
D oosan Infracore
Construction Equipment is launching the DL450-3 model, the first in the company’s new generation large wheel loaders. Powered by a Scania SCR diesel engine meeting the Stage IIIB EU emissions regulations, the new DL450-3 large wheel loader combines high engine power output with new ZF transmissions and several other features to minimise fuel consumption and provide exceptional performance, ease of handling, serviceability, durability and significantly enhanced operator comfort. With a bucket capacity of 4.5
, the new DL-450-3 large wheel loader is intended 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. The DL450-3 model is powered by the 13 litre Scania DC13 SCR 6- cylinder diesel engine delivering ‘best in class’ power and engine torque, with a maximum power output of 264 kW at 1,800 rpm.
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Lower fuel consumption Many of the features of the new generation DL450-3 wheel loader have been developed to optimise fuel efficiency. SCR technology reduces fuel consumption by about 10% compared to similar size machines with EGR technology. Resale is also better as it is easy to reset to Stage II engines for use in emerging markets.
The new DL450-3 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. With the ‘Power-Up’ function, the operator can manually adjust to the next highest working mode by applying a full stroke of the accelerator pedal. With this function, the
operator can travel in moderate ‘Normal’ mode and switch to ‘Power’ mode when it is really needed, such as when taking material from a pile. This capability helps to reduce fuel consumption. The ECO Bar provides information about fuel consumption in relation to machine performance in real-time, allowing the operator to select the driving profile for the best fuel efficiency. The operator can set a password for machine start. If ‘Auto Idle’ is activated, engine speed goes down about 200 rpm after 10 seconds if there is no machine movement. ‘Auto Idle’ is ideal for applications with long waiting times, such as truck loading. Thanks to ‘Auto Idle’, fuel consumption is reduced by up to 8%. All new generation Doosan
large wheel loaders are equipped with load-sensing controlled, variable hydraulic piston pumps, improving performance and reducing fuel consumption. With load sensing, the hydraulic pumps receive a signal from the MCV informing how much oil is needed. This helps to save on engine performance. With the clutch cut-off system engaged, the driver is able to disconnect the transmission from the engine by operating the brake pedal, to have 100% engine performance for the hydraulic system. As a result, movements are faster, breakout force is maximised and fuel consumption
is reduced. All new generation Doosan large wheel loaders are equipped with a torque-converter-cut-off (TCCO) system which, when activated, 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 is up to 10% lower with increased traction compared with conventional systems. In contrast to the drive systems on other machines, the TCCO can be engaged even in second to fifth gear, not just in the highest gear. This makes the TCCO more efficient.
New ZF 5-gear transmission The new ZF 5-gear transmission improves the transfer of power from the engine to the wheels and contributes significantly to the overall reduction in fuel consumption. The change from four to five gears provides better response and acceleration, especially on slopes. Engine speed variation is less thanks to smaller gear steps, and lower engine speed throughout the whole drive range reduces fuel consumption. Thanks to higher shift quality, noise levels are lower while driving performance and productivity have been increased. A lock-up-clutch also helps to reduce fuel consumption. New ZF limited slip Type II
differential axles provide more durability and a longer lifetime.
Rolling resistance for the axles is also reduced, improving traction and decreasing fuel consumption. As an option, customers can choose ZF axles with a hydraulic differential lock. This function is engaged via the operator pedal or in automatic mode, depending on the torque resistance in first and second gear. The advantage of the hydraulic lock system is that it has less rolling resistance compared to the limited slip system. The radiator fan is hydraulically
driven and controlled by an ECU. Changing the fan direction for cleaning the radiator can be done manually from the cab, without having to switch off the engine. Fan reverse intervals (30 minutes to 2 hours) can be set via the menu.
High operator comfort A new cab design features improvements both outside – such as better visibility due to a wider front glass section and an extended wiper blade area, better protection thanks to larger mud guards, improved hand rail and step designs and a new roof cover – as well as inside – such as the new instrument panel with integrated vehicle control unit (VCU).
The control panel has been
redesigned to allow the operator to choose the information they want on the display. Using the ‘Main Menu’, the operator has access to several functions and machine information. Pressure, temperature and engine speed can
FEBRAURY/MARCH 2012 | International Forest Industries 77
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