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CAPITAL EQUIPMENT NEWS
MARCH 2016
4
D
oosan’s newest generation hydrau-
lic excavators – the heavy duty DX-
225LCA series – has been designed
for greater operator comfort, improved fuel
efficiency, enhanced productivity and mini-
mal maintenance requirements.
“There are currently 360 20T Doosan DX
excavators in operation in the local market
and we expect the improved DX225LCA se-
ries to further consolidate Doosan’s position
as a leading supplier in this size class of
equipment,” says Chris Whitehead, national
sales manager, DISA Equipment (Pty) Lim-
ited, trading as Doosan, part of the Capital
Equipment Group (CEG) of Invicta Holdings
Limited. “These robust excavators, which
are now available in Southern Africa, are
fitted with special features to ensure opti-
mum efficiency and extended service life in
harsh local operating conditions.
“Design features for the African market
include a Tier II mechanical engine for re-
duced operating costs, a heavy duty boom
and arm, as well as standard hydraulic
piping for hammer applications. These
machines also have an improved H Class
bucket and are supported by Doosan with a
2 year/4 000 hour warranty.
“This series features a range of new tech-
nologies that deliver effective control over
the machine’s power and also simplify
maintenance procedures. As a result, ef-
ficiency and machine durability are in-
creased, productivity is improved and oper-
ational costs are lowered.”
High performance materials, combined with
advanced computer assisted design tech-
niques, including Finite Element Analysis
(FEA) are used by Doosan to create robust
structures and all materials and compo-
nents are tested under the most extreme
conditions.
FEA has been used to calculate the best
distribution loads throughout the boom
structure. The new strengthened boom of
this series has increased material thickness
which limits element fatigue, thus increas-
ing reliability and extending component
life. A polymer shim added to the bucket
pivot maintains precise control over the
equipment. Cast elements are used in the
arm assembly and reinforcement is added
around the bosses for additional strength
and extended service life.
All welded structures have been designed
to limit stresses. The lateral chassis is
welded and rigidly attached to the under-
carriage. Tracks are composed of sealed,
self-lubricating links, which are isolated
from external contamination for depend-
ability in all conditions. Tracks are locked
by mechanically bolted pins. The hydraulic
track adjuster has a shock absorbing ten-
sion mechanism.
Doosan’s high strength excavators have a
new 6-cylinder water cooled engine that is
optimised and electronically controlled to
boost production, maximise fuel efficiency
and ensure harmful emissions remain well
below the values required for Tier II engines.
The 21,5 T operating weight of these ex-
cavators is enhanced by new specifications
that include a 0,92 m³ bucket capacity,
a digging depth of 5 755 mm, a digging
reach of 8 950 mm and a digging height
of 9 750 mm. The engine rated power is
110 kW (148 HP) at 1 900 rpm. Maximum
engine torque is 61,5 kg.m/1 400 rpm.
For optimum control, the e-POS system
(Electronic Power Optimising System) pro-
vides a perfect synchronised communica-
tion link between the engine’s electronic
DOOSAN
A LEADING CONTENDER
IN THE EXCAVATOR MARKET
By Pierre Sanson