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INDUSTRY NEWS


HANDLING EQUIPMENT Skidder with EHS drive system T


he latest technology from Tigercat, which continues to develop and refine its range of skidders, is the


EHS drive system.


Similar to the field-proven and revolutionary hydrostatic drive system that Tigercat initially devel- oped and released in 1996 with the first 630 skidders, EHS consists of two variable displacement motors as inputs to the Tigercat transfer case. Front and rear out- put shafts are connected directly to the front and rear axles. While the current electronically- controlled hydrostatic drive system found in the D-series skidders performs exceptionally well, EHS is capable of providing the tractive effort of the deepest gear ratio of- fered in Tigercat’s standard transfer case, as well as the top speed of the shallowest gear ratio offered in the standard transfer case.


This is accomplished with more sophisticated computer logic and the ability to take one of the drive motors offline when high tractive effort is not required. In this case, all pump flow is directed to one hydraulic motor, increasing both travel speed and motor efficiency.


When operating conditions demand high tractive effort, both hydrostatic motors are working. When tractive effort requirements are minimal – for instance, when traveling empty – all of the pump flow is directed to one motor for higher travel speeds.


Upgraded forwarder from Komatsu


High productivity is an important characteristic of any forest machine, regardless of whether it is a forwarder or a harvester. As such, the upgraded Model 855.1 forwarder from Komatsu Forest features


improvements that primarily deliver higher productivity, combined with better performance, a greater load capacity and increased reliability. The Komatsu 855.1 boasts a bunk with a 14 tonne load


capacity. In order to utilise the entire load capacity, the bunk is about 10% larger.


Traction on the Komatsu 855.1 is 182 kN (20.5 tonf), which is 11% more than its predecessor. The power train also features new components to further increase reliability. The bogie axles now have a reinforced differential and dual bogie bearings. In addition, the forwarder’s transmission provides lower gearing. The new bogie axles mean that the rear frames have been updated to models suitable for bogie stops. The dual bearings on the bogie axles also increase the distance between the wheels and the frame by 33 mm on both sides, providing more space for bogie tracks.


More information from www.komatsuforest.com


10 November 2013 10


Tigercat is offering EHS standard in the 610C and the new 615C skidders and expects end-users to see higher productivity and improved fuel efficiency in the majority of applications. More information from www.tigercat.com


Reduced


consumption drum chipper


A Pezzolato drum chipper set on a four-axle MAN truck and equipped with an Epsilon crane with cab is a unique machine be- cause it combines high production rates with agility of movement. These characteristics are, in fact, typical of big drum chippers 1400 mm in width capable of chipping logs up to 1 metre in diameter, but its shape is convenient for working in the forest (the supply chain is positioned on the side). This makes it compact and suitable for work- ing in tight spaces.


The production capacity is up to 360 cubic metres per hour – equal to four semi-trailers full of wood chips – and fuel consumption is extraordinarily low: in the first 300 hours of work, chipping logs and treetops, the average consumption (of chipper and crane ) was 1.25 litres of diesel per ton of wood chips produced.


More information from www.pezzolato.it


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