Doosan excavator with IT4 technology

The Doosan DX300LC excavator combines performance and comfort
enhancements with interim Tier 4 technologies. The DX300LC is powered by
a 213-horsepower, six-cylinder Doosan DL08K water-cooled diesel engine
that has been optimized for use with a cooled exhaust gas recirculation
system, diesel oxidation catalyst and diesel particulate filter. The
engine in this configuration is optimized to reduce nitrogen oxides and
after treatment is needed to reduce particulate matter to comply with
interim Tier 4 emission regulations. The 466-cubic-inch engine features a
variable geometry turbocharger to provide optimized boost and a high
pressure common rail design with direct fuel injection, electronic
control and four valves per cylinder to improve fuel efficiency.

Cooling system upgrades include a split cooling system including a
variable-speed hydraulic fan regulating airflow through the oil cooler.
This allows the engine and oil cooling systems to be controlled
independently, improving fuel efficiency and provides a quieter operator
environment. The new cooling system on average has a 10 to 15 per cent
greater cooling capacity.

With an operating weight of 66,782 pounds, a maximum digging depth of 24
feet, dump height of 23 feet 10 inches and maximum digging reach of 35
feet 2 inches, the DX300LC is designed for road building, site
development, oil and gas pipeline development and other construction
applications.

Standard auto idle feature reduces fuel consumption and noise and creates a more comfortable environment. Advertisement

Improvements in engine horsepower and torque, coupled with the six
per cent increase in hydraulic pressure from the hydraulic pump,
translate into increased performance in various workgroup functions.

Swing torque increased by approximately seven per cent, which allows the
excavator to swing uphill more easily, as well as improved backfilling
capabilities. This leads to decreased time per foot of trench, improving
productivity. Digging force has increased approximately five per cent,
which allows for more power in harsh digging conditions, leading to
improved cycle times and enhanced production in trenching applications.

Lifting capacity increased by approximately two per cent, providing
improved power out of the trench, allowing the machine to easily lift
and place more material with each cycle. The boom-up speed improved by
approximately three per cent, which allows for more work to be completed
faster, improving cycle times, reducing truck loading time resulting in
more material moved per hour.

Like all Doosan excavators, the DX300LC has a standard auto idle
feature, which reduces fuel consumption and noise and creates a more
comfortable environment. The auto idle feature, which can be enabled at
the operator’s discretion, automatically reduces the engine RPM to idle
if the excavator functions are not used for a period of four seconds.
The engine automatically returns to the pre-set throttle position when
the operator moves a joystick or a travel function.

The new intelligent boom float option allows the boom of the excavator
to “float” up or down, allowing the operator to focus more on the task
while decreasing the machine workload and increasing efficiency. The
float mode allows the boom to move freely up and down without pump flow
improving operator efficiency when finishing site cleanup. The breaker
mode allows the boom to freely move down without pump flow allowing the
workgroup to follow the path of the breaker through the material and is
also designed to improve truck loading capability. A temporary reset
button allows the operator to momentarily disengage boom float
functionality, allowing pump flow to activate the boom in both
directions.  The operator can choose when to engage intelligent boom
float functionality via a switch on the control panel.

Doosan continues to focus on operator comfort with further enhancements
to the roll-over protective structure 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 a coil spring has been added to reduce cabin vibration 20 per cent,
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. Both front and
rear glass windows are also adjustable. The door space of the cab has
increased by 1.8 inches, allowing the operator to get in and out more
easily. The cabin size has increased 6.1 per cent, 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 operator’s legs.

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