Doosan expands articulated dump truck line at CONEXPO-CON/AGG 2020
The DA30-5 and DA45-5 represent the latest enhancements to ADT performance
The new Doosan DA30-5 and DA45-5 are 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 performance on difficult terrain. The front-mounted turning ring, the tandem bogie and the truck's sloping rear frame provides rough and soft terrain capabilities and avoids the need for electronic aids such as traction control.
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 greater shock absorption. Combined, these suspension system features allow for a better ride, 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 bogey 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 percent.
Payload measuring system
Doosan DA30-5 and DA45-5 ADTs come standard with an active payload measuring system for increased productivity and reduced cycle times. The system provides ADT operators with improved truck management and load optimization by helping to protect against extensive overloading. Operators can view each load's weight on the LCD screen in the operator cab.
An exterior traffic light-style indicator alerts excavator and wheel loader operators who are filling the ADT. They include three lights: red, yellow and green. Operators can easily identify how big the payload is compared to how the material is piling up in the truck. If the green light is illuminated, the truck is within the rate of payload. If the yellow light is illuminated, the operator is withing 10 percent of the rate of payload. If the red light is illuminated, the operator has overloaded the truck for the allowed payload.
Simplified service and maintenance
Doosan also adjusted key service and maintenance points on its new ADTs to help operators perform required daily service checks and maintenance procedures. ADT operators can now more easily access the truck's fuel fill and the diesel exhaust fluid (DEF) fill because both are now available at ground level.
The ADT power module is more easily accessible to operators, it includes a lockable battery disconnect switch and an emergency engine shutdown. A new wait-to-disconnect light allows the truck's cooldown sequence to finish and its DEF purge to complete its cycle.
For easier maintenance, a centralized maintenance panel is accessible behind the left front tire. With ground-level access, operators gain access to the following: level gauges for hydraulic oil and brake fluid; auto-lube system and grease storage; transmission filters; drain ports and the oil sump. Further maintenance access on the platform level provides service to the hydraulic filter, oil fill and system bleeder, transmission oil fill, brake fluid fill and test ports. A diesel-powered engine heater and fuel pump are available as an option for both new Doosan ADTs.
Hydraulic retarder updates
As part of the new Doosan ADTs braking system, a new transmission retarder adjustment lever was added to the right-hand side in the cab below the truck's steering wheel. Doosan DA30-5 and DA45-5 operators can choose from four levels of retarder force: 100%, 75%, 50% and 25%. As an alternative, a keypad button is available and serves the same function as the lever. The truck's accelerator pedal continues to allow for quick retarder power reduction with a slight press.
DoosanCONNECT telematics is an equipment diagnostic tool that monitors the health, location and productivity of Doosan equipment — including the new DA30-5 and DA45-5 ADTs — from a user-friendly mobile app and website. Owners have free access to DoosanCONNECT telematics for the life of the machine with their purchase of any new eligible Doosan equipment. Equipment owners and fleet managers can remotely monitor machine location, hours, fuel usage, engine idle versus work time and error codes, as well as engine and hydraulic temperatures.