Articulated dump trucks
By Rock to Road Staff report
A look at the latest ADTs and complementary vehicles
By Rock to Road Staff report
December 5, 2016 – Rock to Road checks out the latest articulated dump trucks.
The new Cat C2 Series articulated dump truck range includes the 314-hp (234 kW), 725C2 and the 367-hp (274 kW) 730C2 and 730C2 EJ with ejector-type body. Rated payloads are 26.5 tons (24 tonnes) for the 725C2 and 31 tons (28 tonnes) for the two larger models. Standard automatic traction control ensures efficient operation of the new models, which advance the design of predecessor models with increased productivity, lower operating costs, and added rimpull/retarding capability, while retaining the long-term durability, high availability, high resale value, and optimum rental margins of previous models.
Designed and built in Davenport, Iowa, the 460E is the largest ADT in the John Deere lineup. The 481-hp machine is built with features for operator safety, including remote park-brake release; rollover protection; ground-level service; and auto horn. The Deere-designed cab is sealed and pressurized to keep out dust and noise. The 460E employs a heavy-duty fabricated frame and high-alloy steel dump body, ensuring best-in-class payload-to-weight ratios. It also comes loaded with an EPA Final Tier 4 (FT4)/EU Stage IV John Deere Power Tech diesel engine. The 460E is equipped with a purpose built ZF transmission that includes a high capacity retarder, eight forward gears and four reverse gears. In addition, the John Deere hauler axles are designed for heavy-duty applications and include on-the-fly differential locks, outboard planetaries and each axle is independently pressure lubed and filtered.
Simard Suspensions, a tandem suspension specialist for vocational vehicles, offers a new specialized “off-road” truck including all the technology and know-how of the suspension manufacturing company. The Dramis looks like an oversized dump truck, but its features make it a serious complement to rigid or articulated truck fleets. Designed on the basis of a Class 8 vocational truck, the Dramis receives the AMS50THD HD tandem suspension as well as the DTS active hydraulic rear tridem suspension. This highly adaptive suspension allows the Dramis to absorb all the road barriers and eliminates kickback from the chassis. It also has an auto-levelling system, which keeps the dump body horizontal during unloading. The latter has also been specially designed for the Dramis payload capacities. Thus equipped, the Dramis is able to carry up to 55 metric tons of payload and perform duty cycles efficiently. The use of a Class 8 chassis allows low fuel consumption (estimated 16 to 20 litres per hour). The Dramis is available in different chassis configurations such as Mack Granite, Kenworth C500 and T800, Western Star 4900XD and International HX.
Featuring new livery and frontal design, the 38-tonne, TA400 articulated dump truck is the largest in the Terex Trucks articulated range. Investments have been made to ensure increased durability and protection of truck components, including upgraded hydraulic hoses, electrical interfaces, transmission mountings and brake pipes. In order to prolong hydraulic component lifecycles, Terex Trucks has introduced magnetic pressure filters that reduce the risk of contaminants entering the system, and improves the cleanliness of the hydraulic oil. Further lowering operational costs, as well as enhancing safety is the force-cooled multi-disc brakes. Supported by an electronic activated exhaust brake and a six-stage modulating transmission retarder, the TA400 benefits from longer brake component lifecycles. The transmission now features high performance oil that extends time between service intervals to 6,000 hours, and the powerful drivetrain maintains traction in even the most difficult terrain thanks to longitudinal and limited slip transverse differential locks.
The Volvo A45G articulated hauler — powered by the latest Volvo D16, Tier 4 Final engine — boasts 469 horsepower (350 kW) and is capable of 45-ton payloads. New improvements include the Volvo dynamic drive system, which provides an enhanced gear shifting strategy that increases customer fuel efficiency by 3 to 10 per cent. The new Dynamic Volvo Engine Brake (VEB) system dynamically adjusts the torque and shift points against the current load, inclination and rolling resistance, which improves brake life by reducing the need to use the brake and retarder pedal when going downhill. The standard on board weighing system is fully automatic, alerting both the hauler operator and excavator operator when nominal load has been reached to help prevent overloading. The hauler operator can see, in real time, the actual tonnage on an in-cab display that also shows fuel economy in the form of gallons per transported ton, per work cycle, for the last 10 cycles. New standard safety features on the A45G include Hill Assist and a dump support system. Hill Assist is an automatic feature that holds the hauler in place on steep slopes without the need to engage the parking brake. The dump support system allows the operator to see the percentage side inclination of the truck and set allowable parameters for safe dumping operation.
Doosan’s DA40-5 articulated dump trucks feature a flexible and agile undercarriage ensuring all six wheels have permanent ground contact to achieve extreme performance in off-road conditions. The ADTs are built with a Tier 4 (T4) compliant diesel engine with a rated horsepower (net) of 482.8 hp at 1,900 rpm and a maximum torque (net) of 1,750 lbf-ft at 179.73 rpm. They have a loaded operating weight of 158,292 lb., and a rated payload of 88,185 lb. A strong frame and body design with lightweight, high-grade, wear-resistant steel reduces the total weight of the truck, which requires less horsepower for operation. A sloping rear frame, combined with an ideal track width provides a low centre of gravity. A gradient meter helps the operator monitor the incline and pitch of loads for improved safety. Two lateral limited-slip differentials, one front and one rear, deliver top traction, while a free-swinging rear tandem gear-driven bogie delivers added stability.