Capital Equipment News March 2018

COVER STORY

MAXIMUM DEPENDABILITY ACROSS APPLICATIONS

With an array of features aimed at lower fuel consumption, higher productivity and better cycle times, the improved 51 t Doosan DX520LCA has a special design focus on increased uptime and lower total cost of ownership.

T he Doosan DX520LCA crawler excava- tor, designed for dependable operation in tough conditions, comes with advanced features for increased productivity and lower operational costs. The machine copes efficiently in diverse applications, including construction, pipe laying, mining and quarrying, mass excavation and general contracting. New features of the Doosan DX520LCA – which include increased traction force, greater bucket digging forces and in- creased swing torque – ensure improved performance and faster cycle times. “Other design advancements comprise the large, sturdy undercarriage and counter- weight which provide extra stability; a high performance mechanical injection engine for fuel efficiency; and advanced technology for optimum power manage- ment and easy maintenance,” explains Darrel Holton, MD, DISA Equipment (Pty) Limited, trading as Doosan, part of Invicta Holdings Limited. The DX520LCA is powered by a Doosan Tier II 6-cylinder air-to-air intercooler engine that delivers 238 kW (318 hp) @ 2 000 rpm, with sound fuel economy. A large fan size, with improved air, hydraulic oil and fuel filter efficiency, enhances cooling performance, thus reducing fuel consumption. The e-EPOS system (Electronic Power Optimising System) ensures economy and smoothness of operation, by providing a synchronised communication link between the engine’s electronic control unit and the hydraulic system, to ensure power is delivered exactly as required. Advantages of the new user-friendly e-POS system include ease of operation, availability of power through three select- able user modes for optimum efficiency under all conditions. This includes an

automatic auto-idle mode for maximum fuel efficiency. Regulation and precise control of the flow rate required by the machine is standard and a self-diagnosis function enables technical problems to be resolved quickly. Machine settings and maintenance data are clearly displayed on a new user-friendly LCD colour monitor. The machine comes with an advanced hydraulic circuit design which separates the oil flows for the travel and boom function to ensure precise and safe oper- ation when handling loads during travel. Circuits for the boom, arm and bucket are optimised for smooth control during combination work. Key capacities The DX520LCA is said to have the widest standard variable undercarriage in this class size – 3,9 m extended and 3,34 m retracted. The heavy-duty X-shaped undercarriage has an integrated track spring and idler, as well as a durable box section track frame and self-lubricating sealed links. All welded structures are designed to limit stresses. The hydraulic track adjuster has a shock absorbing tension mechanism. The series has a maximum digging force of 30,8 t and a side lifting capacity of 17,7 t at 6 m reach and 3 m height. Traction force has been improved with a drawbar pull of 37,6 t. More features The DX520LCA series has been designed for easy access to all components for quick maintenance procedures and to prevent contamination to the surrounding environment. New design features incorporate the latest ergonomics for improved safety and greater comfort, ensuring operators work

in conditions conducive to high produc- tivity. A spacious, all-weather sound-sup- pressed cab offers a clear, all-round view and effective air conditioning. An adjust- able seat, with an optional air suspension system, reduces vibrations and enhances comfort. The control panel is conveniently positioned for easy use and is simple to read. 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. Holton says Doosan construction equip- ment – which includes track, wheel and mini excavators, articulated dump trucks, as well as wheel loaders and various attachments – has been designed to cope efficiently and safely in Africa’s harsh operating conditions. “Doosan offers its extensive customer base a technical advisory, repair, mainte- nance and spare parts service, through a national network of branches and careful- ly selected distributors,” says Holton.

CAPITAL EQUIPMENT NEWS MARCH 2018 4