Doosan's 28-metric-ton, 365-hp DA30-5 and 40-metric-ton, 490-hp DA40-5 are powered by fuel-efficient Scania DC9 and DC13 diesel engines, respectively. The trucks have been configured with a high-pressure common-rail (HPCR) fuel delivery system as well as cooled exhaust gas recirculation (CEGR). Selective catalytic reduction (SCR) using diesel exhaust fluid (DEF), and a diesel oxidation catalyst (DOC) reduce engine emission levels.
New to these models is a mass airflow sensor and exhaust brake, working in tandem to reduce emissions. The mass airflow sensor allows the electronic control unit to improve the management of airflow provided by the variable geometry turbocharger, and to optimize fuel delivery to the combustion chamber based on air intake volume and rpm. 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 rpm. Under normal operation, with high rpm, the exhaust brake is inactive.
The new Doosan ADTs continue to feature a front-mounted turning ring, a sloping rear frame, tandem rear bogie and independent front suspension. The front-mounted turning ring helps keep all six wheels in permanent contact with the ground, even at a maximum turning angle. These ADTs are able to operate on very rough and soft terrain and are ideal for the mining and aggregate industry, commercial and residential site developments, and infrastructure projects.
A sloping rear frame lowers the centre of gravity for more equal weight distribution, and improved stability and safety when fully loaded. The sloping frame improves tractive effort, helps to minimize tire wear and lowers ground-bearing pressure. The independent front suspension improves operator comfort in rough terrain and assists in maintaining ground contact.
The tandem rear bogie provides maximum ground contact in uneven terrain. Due to the tandem design, fewer points of power transfer mean less power loss and a more efficient driveline. Maintaining maximum ground contact and the best transfer of power to all wheels can result in reduced maintenance costs.
The DA30-5 and DA40-5 now come standard with a gradient meter. Two meter readings are visible on the LCD screen. Uphill/downhill is shown as a percentage, and sideways tilt is shown as a degree value.
DA30-5 and DA40-5 trucks have only three wear parts on the entire rear frame, and they are greased by the automatic lubrication system. It is managed by the vehicle control unit and greases the various sections of the truck only when required. If the grease reservoir is empty, the transmission is limited to first or second gear only to prevent damage to the major components such as the turning ring and the tandem bogies.
Centre of Gravity Adjustment
This feature reacts to sticky material in the body during dumping. If the material starts pulling the hoist cylinders backward, the dumping speed is automatically slowed to allow uniform dumping flow and to minimize unstable conditions.
Free-Swinging Rear Tandem Bogie Suspension
The Doosan ADT's free-swinging gear-driven rear tandem bogie and special articulation system offer excellent performance and the best possible ground contact in soft and uneven terrain for maximum productivity. It also allows easy loading of the truck in almost all positions and applications.
As one of the latest models in the R2-Series excavator lineup, the Bobcat® E88 delivers durability, performance and quality for more productivity. Technically speaking, it's a compact machine, but it brings big performance with its redesigned engine and optimized lift performance, plus undercarriage and counterweight improvements. All these enhancements make this excavator one of the highest-performing models in its size class. With impressive over-the-side lift capacity, you can dig with greater confidence over the side of the machine. Put it to the test against similar models from other manufacturers. You'll see that the E88 can outwork the competition.