Equipment World Digital Magazine
Issue link: http://read.dmtmag.com/i/389791
Doosan has launched two new Tier 4-compliant excavators – the 271-horsepower DX300LC-5 and the 318-horsepower DX- 350LC-5, which replace the DX300LC-3 and DX350LC-3 models, respectively. The crawler excavators feature a range of engine improvements and new aftertreatment technology. The excavators include Scania diesel engines that have a high- pressure common-rail fuel delivery system and cooled exhaust gas recirculation. To aid in meeting Tier 4 emissions standards, the excavators also feature a mass airfl ow sensor (MAF) that enables the electronic control unit to improve the management of the variable geometry turbocharger's (VGT) airfl ow. The MAF also uses the air intake volume and rpm to optimize fuel delivery to the combustion chamber. The VGT improves fuel effi ciency at lower rpms by enhancing boost pressure through the rpm range of the engine. A new exhaust brake boosts operating effi ciency by main- taining constant engine temperature at lower speeds, reducing emission levels when the engine is running at lower rpms. The excavators' selective catalyst reduction and diesel oxidation catalyst lower engine emission levels, using diesel exhaust fl uid injected into the exhaust system to convert NOx into water and nitrogen, while the DOC converts particulate matter emissions into water and carbon dioxide. Boasting a 10 percent fuel savings over the Tier 3-compliant models, the excavators feature auto shutdown following a preset idle time from between 3 and 60 minutes. Operators can choose from four power modes (Power+, Power, Standard and Economy) and four work modes (Digging, Breaker, Shear and Lifting) based on the application, and the work modes are easily confi gured via a dial switch on the console. Operators can monitor the excavator on a 7-inch LCD display panel that accommodates an optional side camera for a split screen view of camera displays. Additional machine updates include an auto-belt tensioner, improved serviceability, anti-skid plates on steps and walking surfaces, battery and alternator upgrades and an improved fl oor pedal angle. The DX350LC-5 has D-ECOPOWER available, which boosts hydraulic system output with engine horsepower, improves machine effi ciency, productivity and fuel consumption, and also refi nes machine control and enhances operator comfort. EquipmentWorld.com | October 2014 13 EDITOR'S PICK EDITOR'S PICK marketplace | by Amy Materson | AMaterson@randallreilly.com DX300LC-5 DX350LC-5 Gross horsepower 271 318 Operating weight 68,764 lbs. 80,654 lbs. Max dig reach (ground) 34 ft. 7 in. 36 ft. Max dig depth 23 ft. 11 in. 24 ft. 8 in. Max loading height 23 ft. 10 in. 23 ft. 6 in. Bucket digging force 44,092 ft.-lb. 57,100 ft.-lb. Arm digging force 30,644 ft.-lb. 41,667 ft.-lb. Drawbar pull 77,162 ft.-lb. 83,335 ft.-lb. Quick specs: FUEL SAVERS