Issue link: http://read.dmtmag.com/i/430655
I DA U N I V E R S A L N ove m b e r - D e ce m b e r 2 0 1 4 21 NUTS AND BOLTS NEWS Continued on page 23 Doosan has added to its Tier IV compliant crawler excavator lineup with the DX420LC-5, DX490LC-5 and DX530LC-5. e new Tier IV compliant excavators replace the interim Tier IV (iT4) DX420LC-3, DX490LC-3 and DX530LC-3. Doosan DX420LC-5, DX490LC-5 and DX530LC-5 excavators comply with Tier IV emission standards with modifi ed diesel engines and a er-treatment technologies. e engines are optimized for use with a high-pressure common- rail (HPCR) fuel delivery system and a cooled exhaust gas recir- culation (CEGR) system. ey utilize a diesel oxidation catalyst (DOC) to reduce particulate matter (PM) and selective catalyst reduction (SCR) a er- treatment to reduce nitrogen oxides (NOx). Additionally, the crawler excavators use a variety of a er-treatment systems as part of the Tier IV compliance, such as diesel exhaust fl uid (DEF), which is used with SCR technology. Doosan added a mass airfl ow sensor and exhaust brake to its existing diesel technologies to help meet Tier IV emission standards. e mass airfl ow sensor allows the electronic control unit (ECU) to improve the management of airfl ow from the variable geometry turbocharger (VGT), and to optimize fuel delivery to the combustion chamber based on engine air intake volume and rpm. e VGT is utilized to enhance boost pressure throughout a wide rpm range of the engine, resulting in improved fuel effi ciency at lower rpms. is also generates higher torque levels and faster engine response even at low rpm. e exhaust brake helps to maintain consistent engine temperatures at lower engine speeds to improve operating effi ciency. Consistent engine temperatures reduce harmful emission levels in the exhaust when the engine is running at lower rpms. Under normal operation, with high rpms, the exhaust brake is inactive. is also gener- ates higher torque levels and faster engine response even at low rpm, and improves machine performance in the Standard and Economy power modes while saving fuel. Display Enhancements An improved 7-in. LCD display panel allows opera- tors to continue monitoring the excavator parameters while viewing the rearview and/ or side view camera image. Critical machine data appears next to the camera view. With an optional side camera, a split screen allows both camera displays to be viewed at once. New additions to the monitor include the DEF gauge and improved fuel effi ciency. To help save valuable diesel fuel, Doosan added auto- shutdown to its excavators to help owners save fuel during non-working conditions. Opera- tors can confi gure the idle time from 3-60 minutes. When enabled, the feature will shut down the excavator's engine when the preset idle time is met. is is particularly helpful in California, where state regulations require idling for only fi ve minutes for off -highway machines. New Machine Updates In addition to auto-shutdown and LCD display panel updates, the new Doosan crawler excava- tors have the following updates: Doosan Expands Heavy Equipment Lineup with Three Tier IV-Compliant Crawler Excavators