HARVESTERS – TECHNOLOGY REVIEW
studies have shown that Tigercat purpose-built track harvesters are 20- 25% more productive than similarly sized excavator conversions equipped with the same attachment. Another big advantage of the H855C is the high capacity cooling system. The reversible fan is hydraulically driven and computer controlled to match cooling requirements. This improves fuel efficiency and makes cold weather starts easier. The variable speed fan helps keep hydraulic oil temperatures more even in cold weather conditions for improved measuring system performance and accuracy.
The H855C is equipped with the new twin-swing drive system. Twin-swing increases swing torque by 35% while reducing pinion loads for extended swing system life.
The patented ER boom system allows the machine operator to extend and retract the boom on a horizontal plane smoothly and quickly using a single joystick. The stick boom or ‘reach’ joystick controls both the main and stick booms simultaneously, resulting in the attachment moving either away from or toward the operator. The main boom and tilt functions operate in the traditional manner to adjust the height and angle of the attachment. An ER on/off switch allows the operator to temporarily turn off ER if they are felling large timber up hill and requires additional stick boom- out force. Key to this technology is reduced
energy consumption. The ER system transfers energy back and forth between the main and the stick boom functions, reducing the total energy needed to move the boom system. This translates to reduced demands for power, pump flow and system cooling. ER technology is unique to Tigercat.
1135
The 1135 falls into a specialised harvester class. According to CTL Product Manager Jon Cooper, the eight-wheel drive machine "is specifically designed to manoeuvre between forwarding rows in tightly spaced first thinning stands, dramatically increasing forwarder row spacing and residual stand quality". The machine's unique characteristics result in high production rates and the lightest possible impact in managed forests. In order to achieve this, the machine is
narrow and highly manoeuvrable with powerful steer cylinders, a tight turn radius, “perfect” wheel tracking, bogie
FEBRUARY/MARCH 2012 | International Forest Industries 57
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