by Kyle Molyneux | Tue 21 Sep 2021
New Doosan DX245NHD-7 heavy duty excavator
Doosan has launched the new DX245NHD-7 25-tonne heavy duty crawler excavator, a completely new model in the Doosan range, designed for the most abrasive of applications. Whilst it is a real 25-tonne excavator, the DX245NHD-7 incorporates 30-tonne class undercarriage components – the chains, rollers, sprocket and the chassis itself are oversized to increase the working lifetime of the machine, even on the toughest jobs, reckons its maker.
Stephane Dieu, Excavator Product Specialist at Doosan said, “The DX245NHD-7 adds a new highly sturdy option in the medium-sized range of crawler excavators from Doosan. With regard to the name of the machine, the ‘N’ stands for ‘Narrow Track’ and the ‘HD’ stands for ‘Heavy Duty’ illustrating its suitability for the most challenging applications. Complementing this, the ‘narrow’ design of the DX245NHD-7 offers the further advantage of a transportation width of only 2.54m.”
Complementing the robust build, the state-of-the-art cab on the DX245NHD-7 is said to take operator comfort and ease of operation to new levels. As well as a new high quality seat, the enhanced cab offers more features as standard than other machines on the market, ensuring super controllability and high precision in all applications.
Key new features in and around the cab include an 8-inch touchscreen, DAB audio (hands-free and bluetooth), Doosan Smart Key (Keyless start system, remote door lock and unlock), a leatherette heated seat (cooling is optional), improved air flow for defrosting and air conditioning, eight LED work lights as standard (another four are optional), AVM - Around View Monitor with 360-degree cameras (option) and ultrasonic sonic detection of obstacles (option).
To meet Stage 5 engine emission regulations, the new DX245NHD-7 excavator is powered by the latest generation Doosan DL06V diesel engine, providing 131 kW (176hp) at 1,800rpm. The DL06V engine offers a new solution to exceed Stage 5 regulations without exhaust gas recirculation (EGR), that boosts the quantity of air available during combustion, increasing the temperature of the process and greatly reducing the amount of particulates produced.
This is combined with super-efficient 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 8,000 hours.
The enhanced fuel efficiency of the DL06V engine in combination with a new hydraulic main valve and the new generation SPC3 Smart Power Controls, provides increased fuel efficiency. There are four power modes (P+, P, S or E) available on the DX245NHD-7 which can be set in both one-way and two-way working modes.
In the DX245NHD-7, the new features include a 5-tonne standard counterweight suited for working with heavier attachments such as tilt-rotators. The heavier counterweight also contributes to the higher lifting and digging capacities of the DX245NHD-7. The DX245NHD-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 5 tonne and has a special bush insert to prevent deformation of the lifting hole.
Complementing the increased stability provided by the new counterweight, the DX245NHD-7 introduces 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, with a new priority valve and an additional hydraulic line maintaining continuous hydraulic flow to the attachment, even when the arm is being used.
There is a new Tiltrotator Mode on the control panel in the DX245NHD-7, which can be selected to ensure an optimised hydraulic flow and helps to maximise the accuracy of tilt-rotator work by eliminating back pressure. This new tilt-rotator 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, to increase the safety of nearby workers and to prevent damage caused by the object falling from the excavator. When Fine Swing activates, the overrun disappears, allowing the DX245NHD-7 to smoothly reach maximum swing speed, whilst removing the shock from the turn reversal at the moment of stopping, resulting in a smooth stop.
The new DX245NHD-7 model is factory-installed as standard with Doosan’s state-of-the-art DoosanConnect wireless fleet monitoring system, too. Spec highlights include a 1.3 cubic metre bucket, a 6,595mm digging depth and 9,715mm reach, plus 6,825mm digging height (all with a standard front). The DX245NHD-7 also has a rear swing radius of 2,815mm, a travel speed of 3 to 5km/h and a lifting capacity at 6m reach of 8.78 tonnes. Maximum digging force over the bucket is 16.5 tonnes and 11.5 tonnes over the arm (ISO).
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