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Excavator enhancements lead to fuel savings, improved uptime protection

Winter 2015

 

 

Doosan expands its heavy equipment lineup with four new crawler excavators, delivering increased performance, improved operator comfort, unmatched reliability and durability. The new models include the DX255LC-5, DX420LC-5, DX490LC-5 and DX530LC-5.

NEW FEATURES

  • Improved anti-skid plates: increases traction on surfaces
  • Auto belt tensioner, fan and air conditioning: simplifies maintenance
  • Auto-shutdown: saves fuel during non-working conditions
  • Battery upgrades: minimizes downtime
  • Emergency engine stop: relocated for easier operator access
  • Improved serviceability: allows for easier access to components and less time for maintenance
  • LCD panel updates: displays key machine information and camera images simultaneously
  • Upgraded alternator: delivers improved power for electrical components
  • New front window design: provides good visibility to the work area and is easier to open and close

A new auto-shutdown feature helps owners save fuel during non-working conditions. When enabled, the feature will shut down the excavator’s engine when the preset idle time is met — operators can configure the idle time from 3 to 60 minutes. This is particularly helpful in California, where state regulations limit idling to 5 minutes for  off-highway machines.

Smart Power Control (SPC), a new selectable feature, consists of two systems — Variable Speed Control and Pump Torque Control — that work together to improve machine efficiency while maintaining productivity and reducing fuel consumption. The engine control unit (ECU) automatically manages SPC when SPC is engaged. Each of the four power modes will function with SPC engaged or disengaged; however, SPC can only be active in the digging work mode.

  • Variable Speed Control: Reduces engine rpm during low workload requirements such as during the swing portion of a dig cycle, which reduces the total energy required to perform a task and improves fuel efficiency by up to 5 percent.
  • Pump Torque Control: Efficiently matches hydraulic pump torque and engine response to the task, preventing engine overload and excess fuel consumption, improving efficiency.

Tier 4 solution

The new crawler excavators are powered by Tier-4 compliant engines and have been optimized for use with a high-pressure common-rail (HPCR) fuel delivery system, cooled exhaust gas recirculation and variable geometry turbocharger (VGT). A selective catalyst reduction with diesel exhaust fluid and a diesel oxidation catalyst are included. Other new features include an exhaust brake and a mass airflow sensor that allows the electronic control unit to improve the management of airflow from the VGT, and optimizes fuel delivery to the combustion chamber based on engine air intake volume and rpm.

 

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