English
New excavators are bookends for projects large and small
Spring 2013
Doosan continues to roll out its newest line of crawler excavators with the introduction of four new models for heavy-duty digging and lifting. At the smaller end, the DX140LCR-3 is a reduced tail swing excavator, and on the larger size, the DX530LC-3 is available as a Super-Long Reach machine.
The four new Doosan crawler excavator models are the DX140LCR-3, DX420LC-3, DX490LC-3 and DX530LC-3. They provide operators with improved power, performance, operator comfort and speed for enhanced productivity. Each excavator is equipped with an interim Tier 4 (iT4) diesel engine, which reduces emissions and helps owners comply with ongoing air quality regulations.
A popular feature of the DX140LCR-3 is a new electronic fan clutch, reducing fuel consumption and noise levels, while providing cooling system efficiency improvements on the machines. Available as standard equipment for the DX420LC-3, DX490LC-3 and DX530LC-3, a hydraulic reversing fan helps reduce debris in the cooling system.
Additional standard equipment includes an Electronic Power Optimizing System (EPOS), auto idle and machine diagnostics. The EPOS communicates with the excavator engine's Electronic Control Unit (ECU) to monitor machine performance and help reduce fuel consumption. The DX140LCR-3 has three selectable power modes: Power, Standard and Economy, while the DX420LC-3, DX490LC-3 and DX490LC-3 have an additional mode — Power+. Each mode is designed to help balance machine power and fuel consumption. Auto idle can also reduce fuel usage, engine life and make for easier communications between the operator and other workers.
Work modes boost productivity
To help operators best match Doosan excavators to a particular job, four work modes are available, which can be set with an easy-to-read display monitor. Work modes include Digging, Lifting, Breaker and Shear to optimize efficiency and fuel economy in specific applications. For example, in the Lifting mode, the increased pump torque, low engine rpms and automatic power boost provide extra muscle when lifting materials such as pipe or concrete barriers.
The DX420LC-3, DX490LC-3 and DX530LC-3 can be equipped with the optional Intelligent Floating Boom which allows the boom of the Doosan excavator to "float" up or down, letting the operator focus more on the task while decreasing the machine workload and increasing efficiency.
Improved operator comfort
Doosan updated the excavator cabs of the large models — DX420LC-3, DX490LC-3 and DX530LC-3 — and improved comfort for those long days on the job. For easier cab entry and exit, Doosan increased the door space by 1.8 inches. Once inside, the excavator cab size increased by about 6 percent, providing more room for the head, arms and legs. To provide a more ergonomic profile, Doosan excavator joystick angles were reduced from 25 degrees to 19 degrees. This improves ergonomics for enhanced operator comfort.
Further Doosan cab improvements include a cab mounting mechanism with a thickened dampening plate, and an internal coil spring. These work in tandem to reduce cab vibration by approximately 20 percent, allowing operators to work longer days with less fatigue. A standard cab enclosure with air suspension seat, air conditioning, heat and MP3 CD player provide a comfortable operating setting. The large cab gives operators good all-around visibility. A rearview camera provides an additional means to view the machine's surroundings, allowing for increased productivity.
Faster travel speed option
A straight travel option, available for all four new models, streamlines the travel and transport of Doosan excavators. This feature is ideal for straight travel, forward and backward, which is common in trenching applications. It provides a single foot pedal in the right front corner of the cab floor that operates both tracks. Additionally, the new machines provide speed improvements, offering more efficient movement around jobsites.
