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Doosan DX420LC Excavators Feature More Power, Performance

The excavator's max digging depth about the height of four men standing on each other's shoulders.

Tue April 09, 2013 - National Edition
Construction Equipment Guide

The Doosan DX420LC-3 excavator enters the market with upgrades that range from improved engine horsepower, lift capacity and cooling capabilities, to multiple cab enhancements and greater fuel efficiency, according to the manufacturer.

With an operating weight of 92,374 lbs. (41,900 kg), a maximum digging depth of 25 ft. 5 in. (7.7 m), dump height of 25 ft. 4 in. (7.7 m) and maximum digging reach of 37 ft. (11 m), the DX420LC-3 has all the features and capabilities to handle road building, site development, oil and gas pipeline development and other construction applications.

The DX420LC-3 is powered by a 6-cylinder 362-hp (270 kW) water-cooled diesel engine that has been optimized for use with a cooled exhaust gas recirculation (CEGR) system, a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). Engines with this configuration are optimized to reduce nitrogen oxides (NOX) and after-treatment is needed to reduce particulate matter in compliance with iTIV emission regulations. The turbocharged engine features a high-pressure common-rail design with direct fuel injection, electronic control and four valves per cylinder.


Swing torque increased by approximately 14 percent, which allows the excavator to swing uphill more easily, as well as improves the ability to backfill trenches. This leads to decreased time per foot of trench, improving productivity. Lifting capacity increased by approximately 4 percent, providing improved power out of the trench, allowing the machine to lift and place more material with each cycle. Bucket digging force has increased approximately 3 percent, distributing more power in harsh digging conditions, leading to decreased cycle times and improved production in trenching applications.

The electronic power optimizing system (EPOS) provides optimum power and fuel efficiency via four work modes, auto-idle and machine diagnostics. Operators can work more effectively with multiple operating modes, easy-to-read display monitors and precise control levers. The new Power+ mode provides improved performance and faster workgroup speeds for heavy-duty work. Four work modes — digging, breaker, shear and the new lifting mode — helps operators to get maximum efficiency and fuel economy in specific applications.

A variable geometry turbocharger (VGT) is utilized to increase boost pressure at lower engine rpm. Controlled by the ECU, the VGT varies the amount of boost supplied to the engine to optimize combustion over the entire rpm range. The VGT also permits the engine to generate a greater amount of torque in a wider band in the rpm range, increasing engine performance at lower engine rpm. This improves machine performance in the standard and economy power modes while saving fuel.

Cooling system upgrades include two variable-speed hydraulic fans. With this upgrade, operators can control the engine coolant and hydraulic oil cooling systems independently, improving fuel efficiency and providing a quieter operator environment. The new cooling system on average has a 10 to 15 percent greater cooling capacity. The engine coolant fan can be manually reversed with a switch from inside the cabin to easily and quickly clean out the radiator.


The DX420LC-3 features a new intelligent floating boom option that allows the boom of the excavator to “float” up or down, enabling the operator to focus more on the task while decreasing the machine workload and increasing efficiency. Float mode permits the boom to move freely up and down without hydraulic flow; and in breaker mode the boom is able to move freely down only, without hydraulic flow. A temporary reset button provides the ability to momentarily disengage the float mode, enabling hydraulic flow to activate the boom. Also offered is an air compressor, which is ideal for operators in remote and dusty locations to clean the cab.


Doosan continues to focus on operator comfort with further enhancements to the roll-over protective structure (ROPS) cabin. Both a seat height lever and tilting function for the seat cushion were added to the seat to allow the operator to find an optimum seating position. The cabin mounting mechanism has been improved with a thickened dampening plate, and internal coil spring has been added to reduce cabin vibration 20 percent, allowing operators to work longer days with less fatigue.

The door window position slider now locks in various positions, preventing it from moving from its intended location. The door space of the cab has increased by 1.8 in. (4.5 cm), allowing the operator to get in and out more easily. The cabin size has increased 6.1 percent, providing more headroom. The joystick angle has been reduced from 25 degrees to 19 degrees to provide a more ergonomic profile and decrease interference with operators’ legs.

The Doosan DX420LC-3 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.

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