Nisula 425C is a multi-purpose harvester head equipped with grapple arms that make timber handling and sorting effortless. The NCU3 control system adjusts the grip force of the grapple arms to the tree stem, enabling a firm grip during felling, feeding and other operations. In combi-machine use, the separate grapple arms also allow loading without changing the head.
When larger trees are felled and heavier stems handled, the grapple arms apply a strong grip to the stem. When feeding starts, the grip force is reduced to minimise friction. The control system has a diameter limit set for the utilisation of the grapple arms during harvesting operations. If necessary, the settings can be adjusted via the control system, but usually the harvester head works best with the standard settings.
The new stronger drive motors increase the feeding capacity by 20% compared with the previous model. The new machined front knives provide improved delimbing efficiency and durability as well as a larger delimbing diameter compared with the previous C-model. 425C offers additional properties for thinning.
Delimbed energy wood processing
Farm tractors equipped with an adapter sleeve mounted crane
Forwarders in combi-machine use
Lighter than 12-ton excavators
NCU3Lite with length and diameter measurement function
NCU3 with length and diameter measurement function + cubic volume measurement function
NCU3i with length and diameter measurement function + cubic volume measurement function + value scaling function
NCU3X with length and diameter measurement function + cubic volume measurement function + value scaling function + data transfer facility
Compatibility with Motomit control systems
Automatic chain adjuster
Stump treatment facility
Separate chain lubrication function
|Clean delimbing Ø, mm||300|
|Single cut Ø, mm (1 stem)||425|
|Number of delimbing knives||2 + 1|
|Opening of front knives, mm||430|
|Opening of grapple arms, mm||920|
|Width in delimbing position, mm (open/closed)||1100/940|
|Height in delimbing position, mm||880|
|Height in felling position, mm||880|
|Operating pressure, bar||210|
|Required oil flow, l/m||120-150|
The head is extremely easy to maintain. All the grease points can be handled with the head in one position.
The cylinder sleeves of the head do not move lengthways, which minimises the movements of the hoses and thereby the risk of damage.
The grapple arms located in the centre of the head and below the stem provide an exceptional triangular support for the stem while it is being handled. Thanks to this property, also extra-large stems are kept in a tight grip.
The triangular support structure facilitates and speeds up the handling of the stem and improves measurement accuracy.
The grapple arms located near the feed rollers facilitate the delimbing of crooked stems. If necessary, the head can be slid past the crooks with the front knives open without losing grip of the stem.
The grapple arms make the head extremely versatile. For example, forked and fallen trees can be handled without difficulty. The grapple arms make it easy to pick up the stem with the right grip for handling, which significantly reduces the risk of damaging the knives and the feed rollers.