Doosan’s two new articulated dump trucks (ADTs) for the 30.8 and 44 ton (28 and 40 t) weight class offer improved performance, fuel efficiency, and increased reliability, serviceability and operator comfort, according to the manufacturer.
Doosan DA30-5 and DA40-5 ADTs have Tier IV compliant diesel engines and feature improvements to the driveline, engine and cab for all-around operator ease of use.
The new 365-hp DA30-5 and 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). Tier IV compliant Doosan ADTs 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 is stored in a DEF tank on the truck. The DOC transforms 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.
New to the DA30-5 and DA40-5 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 rpms. Under normal operation, with high rpms, the exhaust brake is inactive.
Improved Fuel Efficiency
Following extensive hot and cold weather ADT testing with customers, which took place in 2013, the DA40-5 recorded an average of only 4.49 gal. (17 L) an hour. The DA30-5 recorded an average of only 3.96 gal. (15 L) per hour. Note: these results are operator and site specific.
Doosan strives to provide its ADT customers with the lowest and safest cost-per-ton transport rate. For example, the DA40-5 has a new bolt-on rear differential. The DA40-5 has improved gear ratios that provide reduced axle speed, improved component life, reduced vibration and lowered fuel consumption. It will replace the current one-piece rear axle. This design is a competitive advantage to further increase productivity and reliability, while reducing fuel consumption, according to the manufacturer.
The new Doosan ADTs continue to feature a front-mounted turning ring, a sloping rear frame, tandem rear bogey 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 center 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 bogey delivers optimal traction with 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. All of these features to make sure the ADT maintains maximum ground contact and the best transfer of power to all wheels, allowing for reduced maintenance costs.
DA30-5 and DA40-5 ADTs have an external engine intake air grille located on the truck hood’s right-hand side, providing cooler air to the engine intake improving engine efficiency. Plus, a new air vent helps prevent over pressurization in the engine compartment.
Increased Cab Comfort
Numerous design elements in Doosan ADTs make them one of the best trucks for off-road hauling applications. It starts with visibility — an important characteristic of Doosan ADTs. To help promote good visibility from the cab, Doosan ADTs have a sloping hood style for an enhanced front and side view with lateral sight lines. Rearview mirrors provide operators a view of the center tires, while a rear camera — pictured on the color LCD — assists operators in seeing behind the truck. Plus, standard heat and air conditioning, precise steering, ergonomic controls, high quality air-suspension seat, and the lowest noise levels in this ADT size class, increase comfort when operating a Doosan ADT.
Two levers control the transmission gear selection and dumping of the body box. Also featured are the cushioned dumping cylinders which slow the dumping and lowering speeds. A 7-in. LCD shows many machine parameters such as engine rpm, travel speed, differential locks and fuel consumption. In addition, an operating input panel provides increased productivity with heated mirrors and seat, an interaxle lock, retarder activation and machine lights.
The new DA30-5 and DA40-5 now come standard with a gradient meter. Two meter readings are visible on the LCD screen. Up/downhill is shown as a percentage, and sideways tilt is shown as a degree value.
A tilting cab gives service technicians enhanced access to all of the truck’s major components. The cab can be tilted back in less than five minutes to expedite routine maintenance and repairs. New 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 bogeys.
Coming soon, Doosan will announce factory-fitted Doosan Telematics for its ADTs. With this valuable system, customers can check and receive daily reports on the productivity of their ADTs remotely including fuel efficiency, payload and cycle times.
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