Doosan Infracore Construction Equipment has launched 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 minimize fuel consumption and provide exceptional performance, ease of handling, serviceability, durability and significantly enhanced operator comfort.
With a bucket capacity of 4.5m3, the new DL450-3 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 264kW at 1,800rpm.
 
LOWER FUEL CONSUMPTION
Many of the features of the new generation DL450-3 wheel loader have been developed to optimize fuel efficiency. SCR technology reduces fuel consumption by about 10% compared with 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 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 accordingtotheworkingmodeengaged. Withthe‘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 maximized and fuel consumption is reduced.
The DL450-3 and all other 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 2nd to 5th 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 fromtheenginetothewheelsandcontributessignificantlytothe 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 two hours) can be set via the menu.