The Doosan DL450 wheel loader is interim Tier 4 (iT4) compliant and includes improvements ranging from more engine horsepower to increased optional driving power and steering capabilities.

With an operating weight of 56,329 lbs., breakout force of 52,864 lbs., and a full-turn tipping capacity of 41,667 lbs., the 6.3-cubic-yard wheel loader is designed for larger material handling applications, such as quarries, mines, demolition, and industrial operations.

Horsepower has been increased to 354 with a 6-cylinder water-cooled diesel engine that has been optimized for use with selective catalyst reduction (SCR) and diesel exhaust fluid (DEF) to comply with iT4 emission regulations. Engines with this configuration are optimized to reduce particulate matter by operating at higher combustion temperatures and to reduce nitrogen oxides with exhaust after treatment using SCR technology. Additionally, SCR systems offer increased fuel efficiency ─ as much as 16 percent on this machine ─ due to the engine optimization, which improves fuel burn.

The 775-cubic-inch engine features a high-pressure common-rail (HPCR) design with direct fuel injection, electronic control, and four valves per cylinder. The high-pressure common-rail system increases the efficiency of fuel delivery by increasing the pressure up to 34,000 psi. The increased pressure allows the injector to inject a finer mist into the engine, which results in a more efficient combustion that in turn produces more torque and improved fuel economy, less noise, lower operating costs and cleaner exhaust.

Performance 
The upgraded DL450 has an optional hydraulic locking differential available as an alternative to the standard limited slip differential. A hydraulic locking differential provides increased driving power when one wheel spins or loses traction, allowing the machine to navigate tough terrain. The differential may be locked manually or automatically, based on ground conditions.

Another common option for the DL450 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 operator can set upper and lower limits for both the lift arm and bucket stop positions from inside the cab. This provides improved control of the lift arm and bucket positions and is particularly useful when setting return-to-dig positions for the lift arm and bucket, which reduces cycle times in digging and loading applications.

Comfort
The DL450 is now equipped with optional electric steering to decrease operator fatigue during repetitive cycle operations on the jobsite. A joystick has been added to the left armrest that allows the operator to control the directional movement without having to use the steering wheel. A new door makes getting in and out of Doosan wheel loaders — and cleaning the inside of the cab — much easier.

Interior cabin improvements also include a number of multi-function display panel upgrades on a centralized monitor that allows the operator to view comprehensive machine system information. The centralized monitor displays critical machine information ─ such as engine rpm, engine coolant temperature, fuel level, DEF level, machine warnings, time, and the transmission selected gear. A key exterior cabin improvement is lowered front side glass providing improved visibility of operations.

Reliability
More new options for Doosan wheel loaders include a diesel coolant heater to improve starting in cold weather or a block heater that warms the engine coolant before engine startup with an electrical heater.

Service intervals on the front lift arm pins have increased 500 percent 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.

The DL450 — like every new Doosan machine — is covered by a 48-hour parts guarantee. The program guarantees that if a “machine-debilitating” part is needed, Doosan will deliver it directly to the end user within two business days, or Doosan will pay for a replacement machine rental.  The 48-hour parts guarantee is subject to carrier delivery restrictions and/or governmental agency delays.