The new, modular series of the heads includes three different models - the 27RH-II, 28RH-II and 30RH-II
The Kesla range covers both roller and stroke harvester heads from small thinning heads up to heavy-duty heads for clearfelling and processing at landings. The new series of large heads replaces the existing Kesla 28RH and 30RH models. The Kesla 27RH-II is a lighter head for large rubber-wheeled harvesters and 20 ton (maximum) excavators. The head features 2WD feeding with the variable roller angle linkage. It uses three delimbing knives and a short frame design for processing curved trees and eucalypts.
The design of the Kesla 28RH-II is similar to the 27RH-II, but is equipped with four delimbing knives and has the option of 2WD or 3WD synchro-feeding. The 30RH-II is a heavier and more robust head for track-based harvesters and excavators up to 25 tons. It has, like the 28RH-II, four delimbing knives, and it can be equipped with either 2WD or 3WD synchro-feeding. The maximum sawing diameter of the new heads is 78 cm (31 in) when using the JPS R5500 saw unit, and they have a maximum delimbing force of 36 kN. The new heads are suited to conifers and hardwoods.
The new series includes options to equip the head for different working conditions, from the borealis coniferous woods to hardwoods or processing and debarking of Eucalyptus and Acacia. Design improvements have been made to the hydraulics, valves, hoses and feeding motors. Feeding and sawing power has increased. The length and diameter measuring systems have been redesigned for better measuring accuracy. For debarking applications, the heads can be equipped with optional length encoders in the feed motors and optical butt-end sensor. The new heads are also better protected, having improved protection for hoses and sensitive components. Source