Nisula 500H

General-purpose head for thinning and final felling of small stems


500H is a powerful alternative for later thinning and final felling of small-stem stands. Its physical dimensions are suitable for thinning, and, thanks to high-quality materials, the weight is also low, only 640 kg. 500H is a harvester head equipped with additional knives that make the handling of even large stems effortless. The additional knives increase productivity with even larger stems, something that harvester heads in the same weight category are not able to achieve.
The NCU3 control system adjusts the grip force of the head to the size of the stem being handled. When larger trees are felled and heavier stems handled, the grapple arms together with the front and rear knives and the roll cylinder apply a stronger grip force to the stem. When feeding starts, the grip force is reduced gradually to minimise friction. The control system has a diameter limit set for reducing the grip force. If necessary, the settings can be adjusted via the control system, but usually the harvester head works best with the standard settings.


Delimbed energy wood processing
Light final felling


Medium-heavy harvesters
14-16 ton excavators


NCU3Lite with length and diameter measurement function
NCU3i with length and diameter measurement function + cubic volume measurement function + priority bucking function
NCU3X with length and diameter measurement function + cubic volume measurement function + value bucking function + data transfer facility (option)
Compatibility with Motomit control systems and Valmet/Komatsu Max


Saw control
Automatic chain adjuster
Colour marking
Stump treatment facility
Separate chain lubrication function

Technical data

Weight 670kg 1477lb
Clean delimbing Ø 430mm 17"
Single cut Ø (1 stem) 500mm 20"
Number of delimbing knives 5 + 1 5 + 1
Opening of front knives 500mm 20"
Opening of additional knives 720mm 28.3"
Width in delimbing position (open/closed) 1200/980mm 47.2/38.6"
Height in delimbing position (open/closed) 1250/1050mm 49.2/41.3"
Height in felling position 1120mm 44"
Operating pressure 210-230bar 3045-3336psi
Required oil flow 140-180l/m 37-48gpm

Details 500H


The head is extremely easy to maintain. All the grease points can be handled with the head in one position.


The cylinders of the head do not move lengthways, which minimises the movements of the hoses and thereby the risk of damage.


The saw control system and the automatic chain adjuster available as accessories enhance cutting efficiency and usability and decrease chain/saw bar costs.


Machined front knives provide improved delimbing efficiency and durability.


The additional knives 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 additional knives next to the feed rollers facilitate the delimbing of crooked tree stems. If necessary, the head can be slid past the crooks with the front knives open without losing grip of the trunk or delimbing efficiency.