Doosan unveils new DX225LC-7 crawler excavatorPublished 27/9 at 15:18
Doosan has launched the first of the company’s new generation of medium sized Stage V compliant excavators - the new DX225LC-7 23t crawler model. It is also the first Doosan excavator of this size to feature Doosan’s innovative ‘D-Ecopower’ virtual bleed off (VBO) technology, providing operators with higher productivity and lower fuel consumption.
In addition to what Doosan says are higher performance and cost savings, the DX225LC-7 excavator offers new features as standard. Many of these are common to other new medium sized excavators which are set to be launched in the near future and build on the design of the previous generation machines. The new features are said to provide major enhancements in machine controllability, versatility, operator comfort, uptime and return on investment, with a strong focus on increased productivity and robustness.
New heavier counterweight for work with tiltrotators
The DX225LC-7’s new features include a 4.9t standard counterweight particularly suited for working with heavier attachments, such as tiltrotators. The heavier counterweight also contributes to higher lifting and digging capacities compared to the previous generation model. The DX225LC-7 also incorporates as standard a new lifting eye that forms part of the casting for the push link for the bucket attachment at the end of the arm. The new lifting eye has a maximum capacity of 5t and has a special bush insert to prevent deformation of the lifting hole. Complementing the increased stability provided by the new counterweight, is a new smart hydraulic system that offers an improvement of around 30% in attachment work compared to previous excavator models. The new system applies a smart hydraulic logic for optimal distribution of the hydraulic flow rate when both the arm and attachment are working simultaneously.
New tiltrotator mode and swing function
The new tiltrotator mode on the control panel in the DX225LC-7 can be selected to ensure an optimised hydraulic flow and helps to maximise the accuracy of tiltrotator work by eliminating back pressure. This new mode is a special two way flow mode, but it is managed by the ‘EPOS’ like a one way flow mode, with direct return to the tank in each direction, to avoid back pressure and increase flow and controllability. Another standard new feature is the ‘fine swing’ function which minimises the shaking that a lifted object undergoes at the start or stop of a swing movement with the excavator. This has been designed to increase worker safety and to prevent damage caused by the object falling from the excavator. Additionally the cab provides high levels of spaciousness and ergonomics. Key new features in and around the cab include a new 203mm touch screen, DAB audio (hands free and Bluetooth), smart keyless start system, a cooling seat with seat belt warning alarm, parallel wiper system, new design pedals, improved air flow for defrosting and air conditioning.
Doosan D-Ecopower and new engine
Doosan’s D-Ecopower technology utilises an electronic pressure controlled pump within a closed centre hydraulic system, aiming to accomplish increases of up to 26% in productivity and 7% in fuel consumption improvements, depending on the mode selected. A closed centred main control valve minimises pressure loss, while the electric pressure controlled pump manages and optimises engine power more effectively. Improved feedback to the operator through the joystick results in improved machine control and less operator fatigue. The acceleration and deceleration of the excavator workgroup functions are smoother, allowing operators to perform repetitive swinging and digging motions with less jerking movements.
To meet Stage V engine emission regulations, the new DX225LC-7 excavator is powered by the latest generation Doosan ‘DL06V’ diesel engine which offers a new solution to exceed Stage V regulations without exhaust gas recirculation. This is combined with ‘DOC/DPF+SCR’ after treatment technology to ensure minimal emissions. Thanks to the new technology, maintenance of the diesel particulate filter (DPF) has been greatly reduced, with no maintenance required until the machine has operated for 8,000h.
‘SPC3’ smart power controls and telematics
With the DX225LC-7, Doosan has tried to ensure that productivity and environment protection are truly compatible. The enhanced fuel efficiency of the DL06V engine in combination with a new hydraulic main valve and the new generation SPC3 smart power controls provide increased fuel saving of 7% in the ‘S’ mode and +6% in the ‘P+’ mode when compared to the previous generation machine. These are two in a range of four power modes now available on the DX225LC-7, which help to simplify the operation of the new excavator when compared to the more complex choice of eight power modes and SPC combinations in the previous generation machine.
The new DX225LC-7 model is factory installed as standard with Doosan’s state of the art ‘DoosanConnect’ wireless fleet monitoring system. This system offers a web based fleet management solution which is very useful for monitoring the performance and security of machines and promoting preventative maintenance. It is available as a standard feature on all new Doosan excavators (from 14t), all new Doosan wheel loaders and Doosan ADTs.