Doosan has continued the roll-out its Stage 3B machines with the introduction of its emission compliant DX420LC-3 crawler excavator plus 14 tonne and 16 tonne wheeled excavators (DX140W-3 and DX160W-3).
The new 42-tonne class DX420LC-3 gets a 270 kW engine which provides 19 per cent more power and six per cent more torque than its predecessor.
This boosts arm and bucket digging forces to 18.6 tonnes and 25.2 tonnes respectively, while lifting capacity increases to 17.33 tonnes (at 6m) and drawbar pull rises to 34.85 tonnes.
Digging depth is 7,740 mm with buckets ranging from 1.4 cu m to 2.3 cu m. It has almost 11.5 m of ground level reach.
As most manufacturers produce machines up to 38 tonnes and 45 tonnes or above, the DX420LC-3 has little in the way of direct competition and will fit those operations where contractors believe other manufacturers’ machines are either too big or too small.
Its six-cylinder Isuzu engine uses exhaust gas recirculation and a diesel particulate filter to meet the emissions standards, as does the 102 kW Doosan DL06Kb engine in the new wheeled excavators.
The cleaner engine provides two per cent more power and 12 per cent more torque than its predecessor.
Doosan says the wheeled excavators, which are due to be launched at Bauma in April, will be 9 per cent more fuel efficient and benefit from up to a 16 per cent increase in bucket breakout arm forces (at 10.57 tonnes and 8.12 tonnes).
Hydraulic flow will be eight per cent higher and the system pressure has been increased to 343-363 bar while in-cab noise on the new model has been reduced by 5 dB(A).