5 new excavators are being introduced by Doosan Daewoo: the DX range of excavators

No less than 5 new Doosan Daewoo hydraulic excavators will be launched at Intermat, these are the DX300LC, DX340LC, DX420LC, DX480LC and DX520LC.

The models in this new range of excavators are in the class of machines with unladen weights ranging from 30 tons up to 51 tons.

The most significant technical innovation on these machines comes in the form of the use of new electronically-controlled "Common Rail" engines, which conform to the European "Stage lll a" emission directive. This directive sets very rigorous criteria for the limiting of exhaust gas emissions. Alongside this, other directives have been issued at the same time and relate in more detail to noise levels, safety, etc.

2 new Common Rail engines are being launched: a Doosan 6-cylinder in-line engine and a Doosan V 6 engine

Powering these new machines are two new Doosan engines, the 6-cylinder in-line Doosan DL08 engine of 8.07 litres that powers the DX300LC and DX340LC models and the V 6-cylinder Doosan DV11, with a cubic capacity of 10.96 litres, powering the other three models.

The horsepower of these engines range from 200 to 333 hp.

To provide optimal combustion, 4 overhead valves are positioned vertically within each cylinder, along with a centrally mounted Bosch fuel injector, which forms part of the Bosch common rail fuel injection. This system finely controls the actual fuel injection pressure, volume and timing to fit the operating conditions.

The external noise level of the engines has also been reduced through the fitting of a dual-walled exhaust silencer.

The e-Epos electronic management system has been improved and is complemented by the introduction of the new engines

Improvements have also been made to the EPOS (Electronic Power Operating System) electronic management system for the hydraulics, by means of an information transfer line, the e-EPOS is now directly connected both to the engine's electronic management system and to the in-cab monitoring system.

This system, apart from ensuring that the engine is more in phase with the machine's hydraulic system and therefore with the operator's requirements, offers other advantages such as complete monitoring of the excavator.

In terms of added value, these new excavators have many trump cards: increased productivity, reduced consumption and longer service intervals.

We can say that the new DX Series Doosan Daewoo models are more productive than their predecessors whilst consuming less. The hydraulic control system for the excavators has itself also been improved in order to allow the operator to work very precisely during delicate operations such as grading, lifting, etc.

One of the not insignificant advances achieved at the design stage of these new models has been the general reduction in maintenance costs.

Service intervals have consequently been extended, mainly owing to the use of more efficient filters. The engine oil filter uses the high technology of fibreglass filters; this, for example, permits oil changes at 500 hours and allows longer intervals between filter replacements; the same applies for many of the other excavator components such as air filters, fuel filters, etc.

A great deal of attention has also been given to the conditions in which the operator works.

The operator is the one person that the designers have considered above all else during the design phase of this new range of excavators.

In their external appearance, the excavators are much better-looking with a more up-to-date styling and this is apparent especially for the operator in the improved all-round visibility. The cab is roomier with a more extensive glazed surface and is also much quieter.

Visibility towards the ground has also been improved for difficult climatic conditions, particularly with the addition of a second windscreen wiper.
Upwards visibility as well as operator comfort has also been improved by the fitting of a see-through roof as standard.

Operator comfort has also been improved by the installation of a high comfort seat with numerous adjustment possibilities, especially in the lumbar area. The air-conditioning has also been beefed뻰p with an automatic electronic control similar to that of a car, a greater flow of air and better positioning of the air ventilation points in the cab.

Operating the machine is also made easier by a well laid-out and ergonomic instrument panel.
The use of additional items of equipment has also been made easier as the operator can now set the hydraulic flow of the excavator to match the flow requirements of the attachment.

Finally for security and safety, a password system can be initialised to protect the excavator against unauthorised use and help prevent on-site theft.

The excavators offer further added value in terms of improvements in their overall reliability and in various elements, which all combine to increase component working-life.
An important criterion that has been observed at the design stage of this new excavator range has been the improvement of the product's life span. This can only add to the trade-in value of the machine when it is due for replacement and can, of course reduce owning and operating costs.

In achieving this, all of the structural elements such as the main frame, boom and arm have been reviewed and recalculated following the finite element method. Stress tests performed in the design office and laboratories have enabled highly-stressed areas to be identified and reinforcements to be installed.

New materials have also been introduced such as new types of polymers at the boom-arm junction points and new metal rings on the bucket pivot points.

All of these contribute to a reduction in wear, to lessening the parasitic movements when the machine gets older and allowing the lubrication intervals to be increased.
For example, lots of improvements have been introduced on the tracked undercarriage, the chain links of which are now lifetime lubricated.

In summary:

As you will have gathered, these Doosan-Daewoo excavators are a new concept of excavator that has not only been introduced to meet the Stage IIIa European legislation, but also, in particular, to satisfy the needs of the most demanding users.
They inherit nevertheless, all of the good features of their predecessors.