Capital Equipment News March 2016

By Pierre Sanson

DOOSAN A LEADING CONTENDER IN THE EXCAVATOR MARKET

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

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

CAPITAL EQUIPMENT NEWS MARCH 2016 4