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New articulated dump truck models unveiled

Winter 2012

New Doosan articulated dump trucks
Doosan introduces a new family of articulated dump trucks with improved performance. Doosan's new ADTs offer increased engine power and torque, higher payloads, lower fuel consumption, enhanced operator comfort and faster travel speeds.

One item to note is the new branding. The first two models are the DA30 and DA40. DA stands for "Doosan articulated," while the number equals the payload capacity in metric tons.

In keeping with the long-standing benefits of articulated dump trucks, Doosan ADTs offer a flexible and agile undercarriage that is designed to help increase ground surface contact with all six wheels. This provides a smoother ride for the operator when driving on very rough or soft terrains.

Stability and smooth ride
The overriding benefit of Doosan ADTs is the free-swinging rear tandem bogie, which ensures the rear wheels are in contact with the ground, which provides a smoother ride in very rough and soft terrain. This leads to increased stability as the trucks move across roadways and jobsites.

The location of the turning ring in relation to the articulation point is a big advantage for Doosan ADTs. The Doosan ADT articulation joint is positioned behind the turning ring to provide equal weight distribution on the front axle. This also promotes contact between the truck's tires and road surface.

Productivity boost
A unique transmission design in Doosan ADTs provides smooth and equal gear-shifting abilities. The Doosan ADT transmission design includes an interaxle differential. A single longitudinal differential lock gives the ADT an optional power split of 50 percent to the front axle and 50 percent to the rear drivetrain.

More space, better visibility
Doosan's new ADTs improve upon their cab with more space and visibility for the operator. A sloping hood provides an excellent view from the cab. Additionally, reduced noise levels (73 dBa), fully automatic climate control and a rubber suspension cab mounting improves operating conditions.

A new 7-inch color LCD monitor panel provides easy-to-read diagnostics and an automatic backlight dimmer to adjust ambient light conditions. The panel also includes an embedded rearview camera for improved productivity.

Controllability
Inside the cab is a new fingertip-controlled body hoist/dump lever located next to the gear lever. Control of the body hoisting and dumping is done with minimal operator strain. The hoist lever incorporates a higher body-up speed and automatic body-down feature, providing a soft lowering of the dumper body, allowing ease in operation and control.

Reliable and durable components
The reliability of Doosan's ADTs sets them apart from the rest. Doosan accomplishes this with durable components and proven manufacturing processes. Specifically designed engine and transmission components are thoroughly tested to maximize the quality of the machines.

Doosan ADTs have a Vehicle Control Unit (VCU) that acts as the main control center for the machine. The VCU is linked to the display in the operator cab and provides easy viewing of key machine functions. It communicates with the machine to help maintain and service it, such as greasing key components.

An increased radiator capacity has improved the ADTs' cooling by 30 percent. This allows the retarder to function under higher loads while continuing to operate within normal limits.

DA30 — replaces MT31
The Doosan DA30 articulated dump truck is powered by a 375-horsepower, iT4-approved diesel engine. Its engine has an eight percent increase in power and provides 30 percent more torque to help the ADT work in extreme hauling conditions. With improved fuel consumption and a top speed of 34 mph, the DA30 is a leading articulated dump truck. 

DA40 — replaces MT41

Powered by a 500-horsepower, iT4-compliant diesel engine and boasting a 10 percent increase in engine power and 22 percent increase in gross torque, the new DA40 is a hauling juggernaut. With fuel savings in mind, the new DA40 features an 8 percent reduction in fuel consumption. The transmission offers operators eight forward and four reverse speeds.

Doosan excavators enhanced
In conjunction with the new iT4 engines, Doosan is updating its line of crawler excavators with many enhancements designed to maintain its excellence.

Cooling system
The cooling system for Doosan excavators has 10 to 15 percent more cooling capacity. A new variable speed hydraulic cooling fan regulates airflow through the oil cooler. The increased cooling capacity allows the engine to run more efficiently in the optimum operating temperature range. The engine and oil cooling system have separate fans and are controlled independently. Each system runs at its optimum temperature to increase efficiency and extend the life of components.

Hydraulic pump
More consistent flow from the main hydraulic pump contributes to numerous excavator performance enhancements. To start, swing torque increased by approximately 8 to 11 percent. Operators can swing uphill more easily and realize improved backfill of trenches. Digging force increased by about 5 percent to help operators easily power through in harsh digging conditions. Increased lifting capacity allows operators to lift more material with each cycle, and easier placement of objects, such as culverts or pipe.

Improved uptime
A number of enhancements were made to the undercarriage track tensioning system cylinder rods and seals in the track spring and idler assembly to reduce leakage. Additionally, the track link profile was improved and the track rollers have a larger bushing. The drive sprockets have thicker teeth and an improved valley profile to increase longevity of the sprockets and chains. These changes are combined to improve machine uptime.

Improved operator comfort
Changes to the Doosan excavator cab have improved operator comfort. They include an updated seat, a new cabin mount to reduce cab vibration by 20 percent and noise levels by 1.8 dBa, and a new door window position for improved visibility.

NEW: 7-inch LCD monitor
A new 7-inch LCD monitor has an easy-to-read display with critical machine information. It informs operators of the engine coolant temperature, fuel level and hydraulic oil temperature. It also includes the digital engine RPM and 15 different machine warnings. A rear view camera button gives the operator additional means to view the machine's surroundings allowing for increased productivity.

In an effort to maximize excavator and attachment performance, the operator can select from up to 10 pre-defined attachments via the LCD monitor, ensuring the proper flow and pressure are programmed.

Maintenance made easy
The following updates provide improved maintenance for Doosan excavators.

• Master battery cutoff switch: improves battery life during long-term storage
• Engine cover: improved service access
• Engine oil and main fuel filters were relocated to pump compartment
• Fuel filter shut-off valve: ability to shut off fuel flow to the filter during servicing
• Electronic Control Unit (ECU) relocated to the machine frame to reduce vibration and increase service life

Many improvements to Doosan wheel loaders

Much like Doosan excavators, there are many product improvements that will be available with new Doosan wheel loaders.

Performance
Standard on the new DL550 wheel loader (coming in 2012) and available as an option for models DL300 through DL450, Doosan offers a hydraulic locking differential. This is an alternative to the standard limited slip differential. A hydraulic locking differential provides increased driving power when one wheel spins or loses traction. The left and right wheels are hydraulically locked together to rotate at the same speeds and receive equal torque. This feature gives the operator more traction and less tire slippage. A hydraulic locking differential may be locked manually or automatically based on ground conditions.

Another option for Doosan wheel loaders is a torque converter lockup clutch. This enables the machine to climb grades easier and faster increasing productivity as much as 20 percent in certain stockpiling applications.

The wheel loader lift arm and the tilt lever (zBar) side plate thickness have increased. Wheel loader axle upgrades provide more efficient transfer of power.

An optional electronic main control valve allows the operator to set the boom and bucket stop positions from inside the cab, providing improved control of the lift arm and bucket positions. This is particularly useful when setting return to dig positions for the boom and bucket, thereby reducing cycle times in digging and loading applications.

Reliability and durability
Service intervals on the front lift arm pins have increased from 50 to 250 hours, reducing operating costs and downtime. Tilt cylinder hydraulic hoses have been rerouted for improved hose reliability, better hose movement and improved visibility to the attachment. New options for Doosan wheel loaders include a diesel heater and frost plug (block) heater to improve starting.

Comfort
Doosan wheel loader operator comfort improvements start with a new door threshold for easier entry and exit, and cleaning. Once in the operator's seat, a new right-hand control stand is integrated into the seat assembly. It moves with the seat suspension for increased controllability. Lower front corners of the cab give operators improved visibility. Electronic steering is available as an option to help minimize operator fatigue.

New display panel
A new multi-function display panel provides comprehensive machine reporting. It includes a speedometer on the left, LCD display screen in the center and indicator lights on the right. Critical machine information such as engine RPM, engine coolant temperature, transmission oil temperature, fuel level, DEF level  (on machines with SCR after-treatment systems), machine warnings, time, multi-function gauge and the transmission selected gear are indicated.

Heating and cooling improvements
A new automatic system allows the operator to set a desired temperature to maintain a constant cab temperature. A 31 percent increase in airflow has significantly improved the efficiency of the cabin's heater and air conditioner for better operator comfort.

Maintenance
Doosan wheel loader operators may reverse the cooling fan to keep the cooling system clean. The operator has the choice of manually reversing the fan by pressing a switch, or setting it to automatically reverse based on a preset time.

Visit www.DoosanEquipment.com to learn more about air quality standards, iT4 technologies and their integration in Doosan equipment, and more details about the newest Doosan machines and attachments.