The largest excavator that Doosan has ever produced has arrived – meet the 80 tonne DX800LC-7
When it comes to the heaviest duty applications in mining and quarrying, or bulk excavation on infrastructure projects, only the toughest need apply. If you’re removing overburden or loading larger amounts of material into ADTs or rigid frame trucks – and it’s a task that’s been undertaken all day – then the operator will need the highest power and flow combined with comfort and smoothness.
Doosan has now entered this land of the big beasts with the DX800LC-7, which means the Korean manufacturer’s machines extend from 1 to 80 tonne, serving the widest possible spectrum of customer needs in construction, mining, rental, landscaping, waste, recycling and forestry.
The Stage V compliant, 80 tonne newcomer has already found a European customer in Finland, a company who were no doubt attracted by what the manufacturer claims is the highest hydraulic flow for this size of machine. In addition, like all Doosan excavators, much attention has been given to operator comfort and safety. The DX800LC-7 has a new, very spacious operator cab, equipped with ergonomic controls and instrumentation. Special care has been taken to ensure noise is kept to a minimum through enhanced sealing of the engine compartment and extensive use of sound-dampening materials.
All components and assemblies are designed, built, and tested to ensure durability. Multi-stage filters and features such as track guards and cylinder guards for the boom and arm, the auto grease system and greased and sealed track links are designed to provide reliability and a long service life.
Stage V Engine
It is the well-proven Perkins 2506J diesel engine, which provides 403 kW (548 HP) of power output – again, more than any other machine in this class. The engine meets Stage V emission regulations by utilising exhaust gas recirculation, selective catalyst reduction, diesel oxidation catalyst and diesel particulate filter (DPF) after-treatment technologies.
The DPF automatically regenerates every 25 hours and the excavator continues to work unaffected during this regeneration phase, whilst the operator can check the status of the DPF via the display on the gauge panel in the cab.
The high output of the engine is combined with a Virtual Bleed Off (VBO) hydraulic system (D-ECOPOWER+), providing a hydraulic flow of 1,008 l/min and a high system pressure of 343 bar, together contributing to the best performance in the 80 tonne market.
Doosan’s D-ECOPOWER+ technology utilises an electronic pressure-controlled pump within a closed centre hydraulic system to optimise productivity and fuel consumption, 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.
Software is utilised to electronically reproduce the full benefits of an open centre hydraulic system with very little energy loss. The hydraulic system and engine output are fully optimised and synchronised, further reducing losses within the system.
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.
Choice of Boom and Swing Modes
To provide optimised operations when working, the operator can switch between two modes – Boom or Swing – giving priority to boom or swing movements, respectively, so they can best match how they are using the machine to the application they are working on.
Faster working speeds are ensured by the 2-spool Boom Down Regeneration system in the DX800LC-7, which also reduces fuel consumption. The 2-spool hydraulic system for the bucket cylinder also increases hydraulic flow and the working speed of the bucket, again reducing fuel consumption. The DX800LC-7 also has a boom/arm cylinder lock valve (anti-hose burst valve) as standard for increased safety, preventing accidents caused by hydraulic hose rupture on site.
Comfort and Control
Already excelling in spaciousness and ergonomics, the new cab in the DX800LC-7 is designed to significantly enhance operator comfort and ease of operation. The cab has a new high-quality seat and offers more features as standard than other machines on the market, ensuring super controllability and high precision in all applications. Key new features in the cab include a new 8in., touch-enabled colour LCD gauge panel, providing more information via a 30 per cent larger screen, stereo system integrated in the gauge panel (with Bluetooth streaming function), keyless start, and improved air conditioning.
A full camera array is standard, comprising a front camera, two side cameras and a rear camera. The camera display is separated from the gauge panel and provides full visibility around the excavator and allows the operator to see a top-down view of the area outside the machine. This is combined with an AVM (around view monitoring) system as standard.
LED working lamps are also standard on the DX800LC-7, providing up to 75 per cent better illumination of the workspace around the excavator, ensuring improved productivity in dusk and night time work and to help prevent accidents on site.
The new DX800LC-7 is factory-installed with the DoosanCONNECT wireless and web-based fleet management solution, allowing fleet managers to monitor performance, promote preventative maintenance and improve security.
The cooling system in the DX800LC-7 offers a larger cooling capacity with a reduced fan speed and power requirement for the cooling fan. If you’re working in a dusty environment, a reversible cooling fan installed as standard will be a welcome addition. It can be used in the reverse direction to blow away dust in the radiator and oil cooler, saving time and effort in maintenance.
Complementing the class-leading performance, the DX800LC-7 is also designed for maximum uptime on site with proven, high quality, durable components such as Bosch Rexroth MCV and Main Pump systems, a Doosan Mottrol swing device and a very robust Berco undercarriage.