Doosan has launched two new Tier 4-compliant excavators the DX300LC-5 and DX350LC-5. Featuring improvements in fuel efficiency, productivity and durability the two models replace the DX300LC-3 and DX350LC-3 models.The new excavators have new engine modifications and aftertreatment technologies to meet Tier 4 emissions regulations.
Tier 4 engine configuration
Doosan 271-horsepower DX300LC-5 and 318-horsepower DX350LC-5 excavators are powered by Scania diesel engines that have been configured with a high-pressure common-rail (HPCR) fuel delivery system as well as cooled exhaust gas recirculation (CEGR). Doosan also added a mass airflow (MAF) sensor and exhaust brake to the engine to help meet Tier 4 emission standards. The mass airflow sensor allows the electronic control unit (ECU) to improve the management of airflow provided by the variable geometry turbocharger (VGT), and to optimize fuel delivery to the combustion chamber based on air intake volume and rpm. The VGT is utilized to enhance boost pressure throughout a wide rpm range of the engine, resulting in improved fuel efficiency at lower rpms. This also generates 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.
The exhaust brake helps to maintain consistent engine temperatures at lower engine speeds to improve operating efficiency. 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.
Aftertreatment technologies
New Tier 4 compliant Doosan excavators combine selective catalyst reduction (SCR) with a diesel oxidation catalyst (DOC) to reduce engine emission levels. Diesel exhaust fluid (DEF) is used with SCR technology and stored in a DEF tank near the front-left corner (opposite of the operator station) of Doosan crawler excavators. The DOC transforms particulate matter (PM) emissions into harmless water and carbon dioxide. DEF is injected into the exhaust system to transform the nitrogen oxides (NOx) produced during combustion into water and nitrogen.
Productivity boost
Available for the DX350LC-5, D-ECOPOWER optimizes hydraulic system output with engine horsepower, improving machine efficiency, productivity and fuel consumption, as well as refining machine control and enhancing operator comfort. A pressure controlled pump, closed center main control valve and various sensors in the excavator electronically detect and control the precise amount of hydraulic oil required to perform a task.
Fuel Savings
New Tier 4 compliant Doosan excavators feature improved fuel efficiency to help owners reduce operating costs. For example, a Tier 4-compliant DX350LC-5 excavator has a 10 percent fuel savings from the equivalent Tier 3 model. For further fuel savings, auto shutdown helps owners save fuel during non-working conditions. When enabled, the feature will shut down the excavator’s engine after a preset idle time. For example, the operator can configure the idle time from 3 to 60 minutes. For operators in California, auto shutdown helps meet the state’s regulations of idling for only five minutes for off-highway machines.
Display Enhancements
An improved 7-inch LCD display panel allows operators 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 fuel efficiency.
Doosan Telematics
Doosan DX300LC-5 and DX350LC-5 crawler excavators come with a standard three-year subscription to telematics, commonly known as “machine intelligence.” Telematics allows equipment owners to monitor machine location, hours, fuel usage, engine idle versus work time, error codes, and engine and hydraulic temperatures. Owners and fleet managers can monitor their machines remotely after they log in to a website account. Equipment dealers can also help customers through telematics by responding to machine warning messages, providing the proper parts and service after reviewing the website and diagnosing an issue with a machine, and then sending a field service vehicle to make the repairs.
Fuel Savings
New Tier 4 compliant Doosan excavators feature improved fuel efficiency to help owners reduce operating costs. For example, a Tier 4-compliant DX350LC-5 excavator has a 10 percent fuel savings from the equivalent Tier 3 model. For further fuel savings, auto shutdown helps owners save fuel during non-working conditions. When enabled, the feature will shut down the excavator’s engine after a preset idle time. For example, the operator can configure the idle time from 3 to 60 minutes. For operators in California, auto shutdown helps meet the state’s regulations of idling for only five minutes for off-highway machines.
Display Enhancements
An improved 7-inch LCD display panel allows operators 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 fuel efficiency.
Doosan Telematics
Doosan DX300LC-5 and DX350LC-5 crawler excavators come with a standard three-year subscription to telematics, commonly known as “machine intelligence.” Telematics allows equipment owners to monitor machine location, hours, fuel usage, engine idle versus work time, error codes, and engine and hydraulic temperatures. Owners and fleet managers can monitor their machines remotely after they log in to a website account. Equipment dealers can also help customers through telematics by responding to machine warning messages, providing the proper parts and service after reviewing the website and diagnosing an issue with a machine, and then sending a field service vehicle to make the repairs.
