Crawler Excavators meet Tier 4 emissions regulations.

Press Release Summary:

Powered by Scania diesel engines that have been configured with high-pressure common-rail fuel delivery system as well as cooled exhaust gas recirculation, 271 hp Model DX300LC-5 and 318 hp Model DX350LC-5 offer max digging depths of 23 ft, 11 in. and 24 ft, 8 in., respectively. Engines include mass airflow sensor and exhaust brake to help meet Tier 4 emissions standards. With 7 in. LCD, operators can monitor excavator parameters while viewing rearview and/or side view camera image.

Original Press Release:

Doosan Introduces Two New Tier 4 Crawler Excavators - the DX300LC-5 and DX350LC-5

(WEST FARGO, N.D.) Two new Tier 4-compliant Doosan excavators are now available in the United States and Canada — the DX300LC-5 and DX350LC-5 — featuring improvements in fuel efficiency, productivity and durability. Replacing the DX300LC-3 and DX350LC-3 models respectively, the new Doosan crawler excavators have new engine modifications and after treatment 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 transform 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.

Four power modes

Similar to previous Doosan excavators, operators can choose from four power modes for more control to better balance fuel consumption and machine power to the working conditions. Power modes include the following:

• Power+ mode: delivers the fastest workgroup speeds for loading trucks, top digging performance and extra power for digging in hard ground

• Power mode: provides exceptional power and performance for tough digging conditions and truck loading tasks

• Standard power mode: balances the excavator’s fuel consumption in everyday digging, grading and lifting tasks

• Economy mode: reduces fuel consumption for low-demand applications, slows down machine movement for conditions that require extra precision

To further match Doosan excavators to the application at hand, operators can choose from four work modes — Digging, Breaker, Shear and Lifting — to maximize efficiency and fuel economy in specific applications. Operators can configure the work mode by adjusting a dial switch on the right-hand console. A work mode icon displays on the monitor after the operator presses the mode button.

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.

New machine updates

In addition to auto shutdown and LCD display panel updates, the new Doosan DX300LC-5 and DX350LC-5 crawler excavators have the following updates:

• Improved serviceability for uptime protection

• Auto belt tensioner: fan and air conditioning

• Anti-skid plates for better traction on steps and other walking surfaces

• Enhanced access to the emergency engine stop

• Battery and alternator upgrades to minimize downtime

• For greater operator comfort, the floor pedal angle has been improved by 10 degrees.


Some factory-installed options for the new DX300LC-5 and DX350LC-5 crawler excavators include the following:

• Additional work lamps

• Cab guarding for special applications

• Diesel-powered coolant heater for cold starts

• Rotate circuit hydraulic piping

• Straight travel pedal, which allows the operator to travel in a straight line more easily

• Two-way auxiliary hydraulic pedal (in addition to joystick control)


In an effort to minimize downtime, Doosan excavators have standard features that ensure their durability, even when operating in harsh conditions. These features include a robust and reliable track tensioning system. Improvements made during the launch of the dash-3 models, such as larger bushings in track rollers and thicker sprocket teeth, are evident in the dash-5 models. Also carried over from dash-3 models are added reinforcement plates and increased plate thickness to the excavators’ boom and arm.

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.

Quick Look: Doosan DX300LC-5 crawler excavator

• Tier 4 compliant Scania diesel engine

• Horsepower: 271 hp (202 kW)

• Operating weight: 68,764 lb. (31,191 kg)

• Max. digging reach (ground): 34 ft. 7 in. (10,5 m)

• Max. digging depth: 23 ft. 11 in. (7,3 m)

• Max. loading height: 23 ft. 10 in. (7,3 m)

• Bucket digging force: 44,092 lbf. (20,000 kgf)

• Arm digging force: 30,644 lbf. (13,900 kgf)

• Drawbar pull: 77,162 lbf. (35,000 kgf)

• Four power modes are available

• Four work modes are available

Quick Look: Doosan DX350LC-5 crawler excavator

• Tier 4 compliant Scania diesel engine

• Horsepower, gross: 318 hp (237 kW)

• Operating weight: 80,654 lb. (36,584 kg)

• Max. digging reach (ground): 36 ft. (10,9 m)

• Max. digging depth: 24 ft. 8 in. (7,5 m)

• Max. loading height: 23 ft. 6 in. (7,2 m)

• Bucket digging force: 57,100 lbf. (25,900 kgf)

• Arm digging force: 41,667 lbf. (13,900 kgf)

• Drawbar pull: 83,335 lbf. (37,800 kgf)

• Four power modes are available

• Four work modes are available


Doosan Infracore Construction Equipment America, headquartered in West Fargo, North Dakota, markets the Doosan brand of products that includes large excavators, wheel loaders and articulated dump trucks. With more than 160 heavy equipment dealer locations in North America, Doosan is known for an unmatched dedication to service and customer uptime, and durable, reliable products. Doosan is fast becoming a global force in heavy construction equipment. Doosan Infracore Construction Equipment America is a subsidiary of Doosan Infracore Bobcat Holdings Co., Ltd., a wholly owned subsidiary of Doosan Infracore Co., Ltd. For more information on Doosan products, visit

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