As a world premiere in Munich, Doosan is launching 4 new models of wheeled hydraulic excavators:
Doosan hydraulic excavators: DX140W, DX160W, DX190W and DX210 W
Bauma 2007: Following the line of crawler models and with many innovations already made, Doosan is renewing its range of wheeled hydraulic excavators.
Four new wheeled models will be presented at Munich.
The 14.3ton DX140W, the16.5ton DX160W, the 19.3-ton DX190W with a 2-piece articulated boom and finally the 20.8-ton DX210W (tonnage of basic versions).
A few key words sum up the care and attention exercised by Doosan in the development of these new excavators: improved design to increase reliability and durability greater performance, first class comfort and ease of maintenance.
The Engine and performance
These four new excavator models are powered by the new Doosan DL06 engine. This common rail, 6-cylinder engine with air to air inter-cooling is equipped with four valves per cylinder and exhaust gas recirculation, ensuring the emissions are significantly lower than the limits imposed by Phase III regulations.
The power of the engine for the four models is 132 HP (99 kW) for the DX140W and DX160W, 155 HP (116kW) and 162 HP (120 kW) for the DX190W and DX210W, respectively.
In comparison to the engines used in their predecessors the Solar 140W, 160W, 180W and 210W, this new engine develops greater power and higher maximum torque at lower engine rpm. For example, the maximum torque value has been increased by 20% for the DX210W and this is achieved at only 1,400 rpm compared to 1,600 rpm for the Solar 210W. The direct consequences of this translate into greater productivity and better acceleration. The increased responsiveness of the engine is also contributes to the greater efficiency in these new models.
The production performance level has been increased in all four models, as demonstrated by tests carried out in the field, with greatly reduced cycle time. The DX140W and DX160W have also seen their productivity increase by over 27% in relation to the previous Solar machines and t he production efficiency (productivity per litre of fuel) has increased by 19%
The DX190W is 19% more productive for the same fuel consumption in compared with the Solar 180W. Finally the DX210W, which replaces the already highly productive Solar 210W, has had its productivity improved by 4% for the same fuel consumption.
The improved performance is not only related to the engine, but also includes the hydraulic system, that has been fundamentally redesigned to give improved controllability of each service and better combined operation of arm, boom and swing. This is achieved through improved metering characteristics of the main control valve spools, better control of the various flows within the control valve and enhanced joystick characteristics.
The new e-EPOS system combines information from the engine and hydraulic systems to optimise the hydraulic pump management.
Two power modes are offered to fulfil the operator’s needs for power or economy.
Two working modes are offered (digging mode for normal work and trench mode with priority given to rotation).
The performance of the excavators has also been improved through the development of their design. In order to ensure the stability of the machine in the working position, the new DX wheel excavators are now equipped with an automatic axle locking system, whilst still having the option of being able to select full locking
In relation to the general specification of the excavators, they can be supplied in various configurations, for example, with any combination of blade and stabilisers at the front and rear of the chassis. In all cases, this equipment can be operated independently by optional switches situated to the left of the operator. This enables increased stability in all situations by ensuring perfect adaptation to conditions in the field.
The travel speeds slow or fast are selected by a lever situated on the steering column, and an inching speed is also available, to allow constant operation of the boom, arm and swing while maintaining a slow forward / reverse movement.
A speed regulation system (cruise control) is provided as standard, for greater operator comfort.
For fuel economy, the excavators are also equipped with an auto idle system, which automatically reduces the engine rpm when the machine is not being operated.
Finally, use of attachments is facilitated by programmable flow settings that can be set through the instrument panel & then easily selected to suite the attached tool by means of a simple switch situated on the dashboard.
The Cabin, driving comfort and ergonomics
With the importance of the operator’s well-being in mind, Doosan has provided a first class operators cabin.
The cabins on the new DX excavators are where some of the most obvious changes have taken place.
The width of the cabin has been increased by 45 mm, so increasing the volume of the cabin by over 5%.
The air flow of the climate control system has been increased by 8% and ventilation outlets have been repositioned ensuring greater comfort for the operator.
The quality of the seat has also been improved, and now offers more adjustment options enabling the operator to easily find the best and most comfortable driving position.
Front and side visibility has been increased by reducing the width of the uprights and increasing the size of the glazed surfaces.
A transparent roof protection not only provides an additional 30% more natural light in the cabin but also increases safety for work requiring upward vision, such as demolition or material handling.
With regard to driving itself, everything has been done to facilitate the operator’s work, with t he driving information clearly shown on the monitor (The monitor can be set in various languages). Information on the maintenance to be carried out, such as oil and filter changes can also be viewed through monitor.
An anti-theft function is also provided by means of password entry, which can be chosen by the operator.
The noise level has been radically reduced both for the operator and the external environment.
Reliability, durability and maintenance
Doosan uses top quality components. This was a basic instruction, which the designers took into account throughout the development phases.
The Doosan hydraulic excavators are renowned for their reliability. So to ensure this continues structural elements have been revised by detailed analyses following finite element methods, and research programmes have been undertaken on the assemblies and components in order to increase reliability.
The manufacturing methods for the chassis, arm and boom have been improved in this way, with some castings, material thicknesses and welds being modified in order to ensure greater torsion resistance.
The structure of the buckets has been changed, with the bosses being reinforced to reduce lateral wear and tear and abrasion resistant steel has been used for the blade and lateral and rear plates.
The undercarriage has been completely revised, with the transmission directly mounted on the rear axle to increase ground clearance. New reinforced axles have been used, that help to reduce power losses and a revised brake set up that eliminates unwanted movements during digging operations.
The steering system has been improved. It comprises a steering cylinder and a priority cylinder. The centre joint is made of a single part, which helps reduce hydraulic noise, save energy and prevent leakages.
The regular servicing requirements of the machine have almost been reduced by half, which is equivalent to hundreds of hours of work during the machines life. For example, the engine oil change is now every 500 hours and hydraulic oil every 2,000 hours. In order to achieve this, various elements had to be improved such as the capacity and quality of some filters.
All the main components such as the engine, radiators, pumps and hydraulic distributor are easy to access to facilitate servicing.
In the event of a breakdown, some machine diagnostics may be carried out through the machine’s monitor panel, however for more serious interventions or during a full service, more sophisticated diagnostic tools (e-doctor & DMS) can be used to quickly analyse the condition of the engine and the main hydraulic components.
The materials used to manufacture all the pins (buckets & front end) have been improved & when combined with the sintered material used in the bushes reduce the time required for lubrication.
As a result, the new Doosan hydraulic wheel excavators DX140W, DX160W, DX190W and DX210W offer the user maximum performance, comfort and reliability with excellent added value.
Key to the illustrations
1. DX140W, articulated boom and blade
2.
DX190W, articulated boom and blade
3.
DX210W, stabilisers and blade
4.
Cabin
For more information concerning this press release, please contact:
Virginie Pauly
Construction Equipment Marketing Assistant