Doosan introduces next generation articulated dump trucks based on customer input
As the newest generation of articulated dump trucks, the Doosan DA30-5 and DA45-5 represent the latest enhancements to performance, reliability, operator comfort and serviceability. In conjunction with CONEXPO-CON/AGG 2020, Doosan Infracore North America announced the two newest models in its ADT lineup.
Since then, the company has invested in significant research and gathered input from customers to develop the new models with additional features for increased operator productivity
"We upgraded our previous Doosan DA40-5 articulated dump truck to a DA45-5 because the truck's maximum allowable payload has increased to 45 short tons," says Aaron Kleingartner, Doosan Infracore North America product and dealer marketing manager. "The trend with articulated dump trucks has moved to the larger payload capacities, particularly in the 40 ton and larger range. Trucks in this size class regularly operate on large construction sites or in mining operations, so the new, bigger DA45-5 will fit nicely in these areas."
Self-leveling front suspension
The front suspension of the new DA30-5 and DA45-5 has been updated to a hydro-gas, self-leveling system to provide performance and greater shock absorption. Combined, these suspension system features allow for a better ride and operator comfort, especially when the truck is driven while empty. The truck's hydro-gas cylinders connect to pressure accumulators. The accumulators and hydraulic system replace previous shock absorbers and a rubber spring. The updated suspension includes a self-leveling feature and the ability to change characteristics by adjusting the pressure. Also, the overall height of the front suspension can be changed by adjusting the suspension system pressure, which proves useful for lowering the transport height of the articulated dump trucks.
In the newest Doosan ADTs, common oil is used in the articulated dump truck's wheel hubs, tandem rear bogie and limited slip differential. The limited slip differential transfers the power to the left and right front wheels. The differential automatically provides the highest torque to the wheel that has the best grip. An oil-bathed gear box at the rear of the truck is free swinging to allow maximum ground contact of the wheels for the best traction, power to ground and stability. Additional updates to the driveline include a new brake package for improved reliability and lower maintenance costs. Hardened steel bearings on the tandem bearing are now used in the manufacturing process, increasing the durability of the design. Updates to the grease distribution system enhance the bearings grease grooves to improve lubrication distribution and lower grease requirements by as much as 50%.
The Doosan DA30-5 and DA45-5 continue to be designed with a front-mounted turning ring to provide equal weight distribution to the front axle even during maximum steer articulating. This, together with a unique free-swinging rear tandem bogie, ensures equal distribution of weight to each wheel and allows permanent 6-wheel contact and drive for equal power distribution and excellent performance on difficult terrain. The front-mounted turning ring, the tandem bogie and the truck's sloping rear frame results in rough and soft terrain capabilities and avoids the need for electronic aids such as traction control.