New 71.5tonne DX700LC tops Doosan’s crawler excavator range

News - Company News

02Doosan’s largest crawler excavator, the new DX700LC, has been designed for heavy-duty applications such as quarrying and major infrastructure construction. 

It has a long carriage (LC) design and an undercarriage that expands to a maximum working width of 4m – a combination that the company says offers optimum stability and safety in all kinds of digging, lifting and loading applications.

Three arms of varying lengths are available, with the EU-approved 2m arm offering a maximum digging depth of 7m, a maximum digging height of 12m, a reach of up to 12.7m and a dump height of 8.18m. The minimum swing radius is 4m.

Digging force over the bucket is 33.3tonnes, while that over the arm is 27tonnes.  Both forces can be increased by about 9% using a power boost feature.

Power for the DX700LC comes from a six-cylinder Isuzu turbo-charged diesel engine providing 345kW at a maximum governed speed of 1,800rpm. The maximum torque is 202kg.m at 1,500rpm.  Features for reduced emissions and fuel consumption include a high-pressure fuel injection system with exhaust gas recirculation and an electronic control system for optimum power.  

The hydraulic system of the DX700LC features a new mode control system. In addition to a standard mode, there is a power mode for heavy-duty digging and loading, economy mode for medium-duty digging, loading or dumping and a mode designed for lifting of pipes or beams.

Features aimed at operator comfort include provision for keeping noise to a minimum through improved sealing of the engine compartment and extensive use of sound-dampening materials.  The noise level at the operator’s ear is 76dB(A).