Forest thinning felling head 425C

with delimber

More features to enhance harvesting operations Nisula 425C is a multi-purpose harvester head equipped with grapple arms that make handling and sorting timber effortless. The NCU3 control system adjusts the grip force of the grapple arms to the tree stem being handled, enabling a firm grip of the stem during felling, feeding and moving operations. In combined use, the separate grapple arms also allow loading without changing the head. When larger and heavier trees are felled and moved, the grapple arms apply a strong grip on the stem. When feeding starts, the grip force is reduced to minimise friction. The control system has a diameter limit set for the utilization of the grapple arms during processing. If necessary, the settings can be adjusted via the control system, but usually the harvester head works best with the standard settings. New stronger driver motors increase the feeding capacity by 20% compared with the previous model. New machined front knives offer improved delimbing efficiency and durability as well as a larger delimbing diameter compared with the C model. 425C offers additional features for thinning.