[ COVER STORY ]
This series has a longer undercarriagee
than competitor machines. Although a
shorter undercarriage reduces
manufacturing costs, stability of these
machines is compromised. All welded
structures of the Doosan undercarriage
have been designed to limit stresses.
The lateral chassis is welded and rigidly
attached to the undercarriage. Tracks
locked by mechanically bolted pins, are
composed of sealed, self-lubricating
links, which are isolated from external
contamination for dependability in all
conditions. The hydraulic track adjuster
has a shock absorbing tension
mechanism. The DX225LCA series has
standard hydraulic piping for hammer
applications and an improved H Class
bucket. This machine is supported by
Doosan with a two year/ 4 000 hour
warranty. The swing mechanism – an
axial piston motor with a two stage
planetary reduction gear – offers
increased swing torque, at reduced
swing times. The maximum swing
speed is 11rpm.
The 21.5T operating weight of these
excavators is enhanced by new
specifications that include a 0.92m³
bucket capacity, a digging depth of
5 755mm, a digging reach of 8 950mm
and a digging height of 9 750mm. The
engine rated power is 110kW (148 HP) at
1 900rpm. Maximum engine torque is
61.5kg.m/1 400rpm.
For optimum control, the e-POS
system (Electronic Power Optimising
System) provides a perfect synchronised
communication link between the
engine’s electronic control unit and the
hydraulic system. A controller area
network system facilitates a constant
flow of information between the engine
and hydraulic system, ensuring power is
delivered exactly as it is needed.
Tests show that the machines have
the industry’s best traction force – for its
machine weight – working on a slope or
on tough ground conditions.
This hydraulic system enables
independent or combined operations.
Two travel speeds offer either increased
torque or high speed tracking and an
auto deceleration system and cross
sensing pump ensure fuel savings.
The conveniently positioned multi-
function colour LCD monitor panel has
standard features for simple control and
efficient operation. These controls
include mode selection, precise flow
rate regulation, auto deceleration and
display selection. Maintenance and oil
change intervals can be displayed, a self-
diagnosis function allows technical
problems to be quickly resolved and an
operational memory provides a graphic
display of the machine’s status.
Levelling operations, movement of
lifted loads and tricky manoeuvres are all
controlled easily and precisely with
control levers. Buttons integrated on the
levers are used to operate additional
equipment, like grabs, crushers and
grippers. Doosan’s DX225LCA machines
have been designed with the latest
ergonomics, which enhance efficient
operation, improve safety and offer
greater operator comfort for reduced
fatigue. New features include a spacious,
all weather sound-suppressed cab with a
clear all round view, effective air
conditioning and an adjustable seat,
with an optional air suspension system
to reduce vibrations. For improved
safety, there are large handrails and a
wide step with anti-slip plates, right and
left rear view mirrors, a travel alarm and
safety glass. This series has been
designed for easy maintenance and
reduced downtime. A PC monitoring
function enables connection to the
e-POS control system. Various
parameters can be checked during
maintenance, including pump pressure,
engine rotation and engine speed. This
information can be stored and printed
for analysis.
Easy access to all components,
including the engine oil filter, radiators
and grease inlets, enables quick
maintenance procedures and prevents
contamination to the surrounding
environment. DX225LCA excavators are
used in diverse industries, including
construction, mining and quarrying,
marine, civil engineering and forestry.
Doosan offers a national technical
advisory, maintenance and support
service through its branches in
Johannesburg, Durban and
Wolmaransstad and dealers in East
London, Port Elizabeth, Cape Town,
Middelburg, Kimberley, Rustenburg
and Bloemfontein.
The aggregate produced by the Rapid Mix 400 is
trucked to Kwa Mhlanga’s Bomag BF800P Paver,
which spreads it onto the desired width of
roadway being constructed. The base material is
then compacted using a Bomag BW219D
Smooth Drum Roller.
The DX225LCA series has notable design features especially for the
African market, with advantages over other machines in the same
size class of equipment. These features include a Tier II mechanical
engine for reduced operating costs, a heavy duty boom and arm, as
well as standard hydraulic piping for hammer applications and a
longer undercarriage than competitor machines. DX225LCA
hydraulic excavator also have an improved H Class bucket and are
supported by Doosan with a two year/ 4 000 hour warranty.
APRIL 2017 | HIRE SA | 7