Doosan's DX300LC-5 and DX350LC-5 are Tier 4 compliant crawler excavators. The Tier 4 engine configuration for the DX300LC-5 has 271 hp, and the DX350LC-5 excavators have 318 hp. They feature Scania diesel engines configured with a high-pressure common-rail fuel delivery system as well as cooled exhaust gas recirculation.

Operators can choose from four power modes to better balance fuel consumption and machine power to the working conditions. Power modes include power+, power, standard, and economy. Operators can also 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.

Improved fuel efficiency means the Tier 4 compliant DX350LC-5 excavator has a 10% 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.