Doosan displayed three interim Tier 4-compliant machines and a display engine at ConExpo last week in Las Vegas. The machines included a DL450 wheel loader, a DX300LC crawler excavator and an MT41 articulated dump truck. An iT4-compliant Doosan engine was also on display.
“As 2011 progresses, Doosan will continue to provide further emission-related information as necessary to keep our customers informed and educated on our progression through this endeavor,” said Aaron Kleingartner, segment application marketing manager.
Kleingartner said an engine technology that Doosan already utilizes extensively on higher horsepower engines is high-pressure common rail fuel injection systems. HPCR was applied to many Doosan models with Tier 3-compliant engines and will be an enabler for application of further technologies needed for iT4 and Tier-4 compliance, along with cooled exhaust gas recirculation (CEGR), diesel particulate filters (DPF), diesel oxidation catalysts (DOC) or selective catalytic reduction systems (SCR).
“It should be noted that iT4 and Tier 4, as they apply to Doosan heavy equipment, is not one set of emission standards and one compliance deadline,” Kleingartner said. “IT4 and Tier 4 emission standards and compliance deadlines vary considerably among different engine horsepower ratings.”
Currently, he said, iT4 compliance for Doosan products with 50- to 75-hp engines has already been completed. That’s because iT4 emission standards are less stringent to this range of engine horsepower compared to higher (>75) horsepower engines, and changes required to achieve compliance for engines in this class were less complex.
Doosan’s website provides a complete overview of iT4 and Tier 4 emission standards, including emission history, emission evolution of Doosan equipment, technologies and links to resources for more information. There is also a link to download the Doosan brochure, “Looking ahead to Tier 4.” To access the page, go to www.doosanequipment.com/dice/products/tier4/Tier+4+Overview.page.
For the rental market, the company introduced its new Doosan DL200TC tool carrier and DL250 High Lift wheel loader. The DL200TC features a parallel-lift linkage system designed to move pallets, pipe and other materials around jobsites. The DL250 High Lift wheel loader is designed to load stockpiled, light materials such as grain, fertilizer, coal or waste into high-sided trucks or hoppers.
The DL200TC provides visibility down the center of the lift arms, allowing the operator to see the ground, truck or work area in front of the machine when placing loads. In addition, the parallel-lift linkage system keeps the work tool flat as it is lifted rather than rolling back, an advantage when lifting pallets and other loads that need to stay level.
Built around a Tier 3-compliant, 143-hp, 6-cylinder Doosan diesel engine, the DL200TC has an operating weight of 25,708 pounds with a standard 2.6-cubic-yard bucket. Dump height is 8 feet 11 inches, and dump reach is 3 feet 1 inch. The DL250 features a Tier 3-compliant, 6-cylinder Doosan DL06 162-net-hp diesel engine. The advanced engine design features a high-pressure common rail direct fuel injection system and electronic control that results in increased power and torque.
Like all Doosan wheel loaders, the DL200TC and DL250 High Lift feature full powershift transmissions with manual, automatic and semiautomatic (with “kick down” for first gear) modes. Transmission and engine operation can be easily diagnosed by connecting a laptop computer.
Doosan Infracore Construction Equipment America, headquartered in West Fargo, N.D., markets the Doosan brand of products, which includes large excavators, wheel loaders and articulated dump trucks.