The newly launched Doosan DX300LC-7 30 tonne model – which is used in the construction and demolition sectors – is the company’s first mid-sized Stage V crawler excavator. It is now being joined by the 36 tonne DX350LC-7 model – suitable for use in construction demolition and small quarries – which is available to European customers from the start of October.
Stage V ‘-7’ models of the rest of the crawler excavator range are due to be available by June 2020, according to Stephane Dieu, excavator product specialist and sales trainer for Doosan Infracore Construction Equipment EMEA.
The range covers the 40 tonne DX380LC-7 (due to be available to European customers in Q1 2020), in addition to the larger DX420LC-7, DX490LC-7 and DX530LC-7 machines which are suitable for quarrying. These models will have the same improvements as the DX300LC-7, including 360° cameras fitted as standard that provide full visibility around the excavator and allow the operator to see a top-down view of the area outside the machine. The camera array comprises a front camera, two side cameras and a rear camera - the same set-up will be used when the larger models are rolled out.
Also standard is a new 8-inch touch-enabled colour LCD gauge panel to provide more information via a 30% larger screen, and a stereo system integrated in the gauge panel.
Available as options on the ‘-7’ range are LED lights to improve visibility of the excavator, side protection, an air compressor, ultrasonic detection of obstacles, and a smart keyless start system.
Doosan says the new Stage V range builds on the design of the previous Stage IV machine and introduces major enhancements in operator comfort, machine controllability, productivity, uptime and return on investment, with a focus on low fuel consumption, increased power, robustness and versatility. To meet the Stage V European engine emission regulations, the new DX300LC-7 excavator is powered by the latest generation Doosan DL08 diesel engine, providing 202 kW of power at 1800 RPM.
Speaking at the Doosan Quarry Days event held in mid-September in the Czech Republic, Stephane Dieu told Aggregates Business that the new smart power control (SPC) on the ‘-7’ range will give greater fuel economy. “Instead of having fixed RPM the excavator will adjust it to save fuel depending on what activity you are doing,” said Dieu. “Digging needs power while less is required for lifting or emptying the bucket. SPC will improve fuel consumption by 5-7% compared with the previous models.”
He added that fuel efficiency will also be improved by the VBO (Virtual Bleed Off) technology co-developed with Bosch Rexroth which is being fitted as standard on all the Stage V excavators. “VBO is part of the hydraulic system and is more sensitive to the load the excavator is carrying,” he added.
