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width and is powered by a pair of variable displacement drive motors. The Predator mulcher head is equipped with 49 single-bolt teeth, including end teeth with extra carbide. The mulching head also has a synchronous drive belt for low maintenance and long wear life and slotted mounting lugs to follow terrain with minimal machine stress. A manually adjustable tree catcher and hydraulic debris flap is standard equipment. The Hydra Stumper head muscles


through stumps with its 48” (122 cm) diameter x 3” (7.6 cm) thick cutter wheel equipped with 56 Monster Tooth™ cutter tools. The cutting range is 9’ (2.74 m) wide, 8’10” (2.69) high and 46” (116.84 cm) deep. Rayco plans to add the DENIS CIMAF mulching head as an option for the T415 in the near future. Rayco’s patented elevated


cooling design places engine radiators in both the rear of the engine compartment and in the limbriser for maximum cooling in even the harshest environments, including areas with high ambient temperatures and a considerable amount of airborne debris. Debris screens trap airborne chaff before it can plug radiator fins. These screens are easily removable without tools for cleaning. Reversing fans also clear debris screens on-command, extending service intervals. The fans run at variable speed based on temperature and reverse based on a timer or by manual control from the operator’s cab. An on-board air compressor further aids in cleaning debris screens. Other features include Rayco’s


track tensioning system with monitor, which alerts the operator to over-tension situations and provides easier access to track tension grease fittings; hydraulic tilt cab to access pumps and other components easily; and the heavy-duty 35,000-lb (15,875-kg) hydraulic rear winch. A number of safety features are designed into the T415, including high-output LED lights on all four sides of the machine, emergency e-stop button, and an escape hatch in the roof of the cab.


Spring 2019 Forest Bioenergy Review 15


New ‘all-terrain’ Doosan excavator in Germany


A


new 22 tonne Doosan DX225LC-5 crawler excavator has been converted into an ‘all-


terrain’ machine for contracts being carried out in the Wadden Sea in Germany, by the company, Sven Jacobs Tief-, Garten- und Landschaftsbau, based in Tating (Schleswig-Holstein). The conversion of the Doosan excavator supplied by local Doosan dealer, Atlas Hamburg GmbH, was completed by OLKO- Maschinentechnik GmbH from Olfen (NRW). The main application area for


the new all-terrain excavator is the approximately 11.3 km long Hindenburgdamm embankment, which connects the island of Sylt with the mainland in Germany. Around 8.1 km of the Hindenburg embankment runs through the Wadden Sea. To prevent the standard Doosan


22-tonne crawler excavator from sinking into the water, a particularly low ground pressure is required. For this purpose, Jens Mewes, from Sales at Atlas Hamburg, who has been working with the Jacobs


company for four years, contacted OLKO-Maschinentechnik to carry out the conversion needed. OLKO has mounted the superstructure of the Doosan DX225LC-5 on an all-terrain undercarriage, not a standard pontoon, to ensure the full manoeuvrability of the excavator has been maintained.


Individually adapted for


customer requirements Jacobs has been using Doosan excavators since 2014 and the new machine is the fifth Doosan crawler excavator they have purchased. The DX225LC-5 features the same new distinctive engine design that characterizes all the excavators in the latest Doosan LC-5 generation and is powered by the proven water-cooled Doosan 6-cylinder DL06P turbo-charged diesel engine that delivers 124 kW (168 hp) at 1800 rpm. This provides more than enough power and high torque at a lower speed. The OLKO undercarriage is designed for difficult applications in adverse conditions and on challenging surfaces, such as those found in, for example, wetlands, as


well as performing environmentally friendly work in sensitive environments. It also makes it possible to carry out work on lakes, rivers and coastal areas. The type U/1800 undercarriage used on the Doosan DX225LC-5 has a length of 10.80 m, a width of 6.20 m and a height of 2.35 m. The undercarriage alone weighs around 27 tonne and produces a buoyancy of 580 kN. It achieves a load capacity of 18 tonne and a maximum speed of 4 km/h. In addition to the conversion of the chassis, a number of other modifications were made by OLKO. This included fitting the crawler excavator with a 9 m boom and a dipper stick 6 m in length. The extended reach makes it possible to work underwater without any problems. In addition, a supplementary fuel tank and a shelf for an anchor were installed. In order to comply with environmental regulations, the machine was converted to biodegradable Panolin hydraulic oil. OLKO ensured that the finished machine is certified with the CE mark and accompanied by the documentation required by the EU Machinery Directive.


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