14 October, 2021
Kesla introduces the third generation of the RH harvester head range
harvester head is suitable for both thinning and final felling
due to its versatility
26RH-III belongs in the highest volume size class of the
market. Equipped with four moving delimbing knives, the
26RH-III can handle even large trees with ease, and the
delimbing quality is good on even the most branchy trees.
The head, weighing approximately one tonne, is suitable for
mounting in medium-size harvesters and in 13 to 16 tonne
excavators. Its sister model, the 24RH-III equipped with one
rear knife and is a good choice for handling crooked
broad-leaved trees and debarking eucalypts due to its
deliveries of the first 3rd generation models, the 19RH-III
and 21RH-III thinning heads, began at the beginning of 2021.
The Kesla 19RH-III is a three-knife, lighter and more
compact head specially developed for curved broad-leaved
trees and debarking, making it also ideal for thinning in
Scandinavian forests. Equipped with two rear knives, the
21RH-III can handle even bigger trees and is a choice as a
thinning machine's all-round head, which can also handle
final felling of smaller trees. Both models can be equipped
with the Kesla mthGRIP accumulating grapple and multi-stem
processing feed rollers. The Kesla 21RH-III is also
available with Kesla's unique proAX cutting knife, which
improves efficiency in harvesting small-diameter trees.
largest heads 27/28RH-III and 29/30RH-III have also
undergone thorough renewal and now represent the design and
technology of the third generation.
design of the new models has progressed hand in hand with
the renewal of Kesla's manufacturing technology, and
evolving automation has been considered in the design from
the very beginning. The frame modules are machined as a one
piece after the welding assembly, and the moving parts make
use of casting to a great extent. This brings the
structures' dimensional accuracy to a new level. This,
combined with heavy-duty axles and bearings, will further
increase the extended structural service life of the Kesla
harvester heads and improve their performance.
hydraulics of the RH-III heads has been redesigned. The
starting point was minimized power losses, high net power
and suitability for various base machines. The spacious
hydraulic system of the heads can handle even a high oil
flow with small losses, and the excellent efficiency of the
2WD feed system enables high performance even with base
machines that have a modest hydraulic output.
targets in terms of structural strength and power-to-weight
ratio were set particularly high, the zero series of all the
size classes have been tested for a long time in various
base machines around the world. The testing process has also
involved forest companies and base machine manufacturers.
Due to their modular design, the new third-generation RH
harvester heads can easily be optimised to operate in
different circumstances, with different types of trees and
with different base machines. Deliveries of the KESLA RH-III
series, covering the whole collection, will start in early
Original Source: Source