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SP Maskiner - Model SP 661 LF -Harvester Head
The SP 661 LF is a compact and strong high performance harvester head designed according to SP´s Low Friction principle for minimum friction and maximum productivity. The SP 661 LF is designed to be able to offer highest productivity in both small and large diameter harvesting.
In large diameter harvesting the proportional angled feed rollers in combination with SP´s patented knife control system LogHold, ensures an impressive capacity and productivity. When harvesting smaller diameter trees the compact and agile design is a great asset. Equipped with the optional Multi tre handling equipment the SP 661 LF is able to reach highest productivity also when harvesting very small tree dimensions.
The extremely protected and robust design in combination with state of the art hose routing ensures highest reliability and uptime regardless of tree size and harvesting condition. The SP 661 LF is without a doubt both compact, strong and productive. The SP 661 LF reaches top performance in stands with a diameter of 18 to 45 cm (7 – 18”) dbh but is thanks to the LF principle also capable of efficiently working with larger tree sizes
- Weight 1450kg
- Cutting diameter 70cm
- Optimum trunk diameter 18-45cm
- Recommended working pressure 26-30MPa
Learn more about the technology behind our various harvester heads. Here you will find everything from information about cutting and delimbing to weights and dimensions.
Hydraulics Metric
- Min. pump capacity: 200 l/min
- Rec. working pressure: 26-30 MPa
Feeding
Proportional clamping pressure of the feed rollers in relation to trunk diameter, individual settings for different species for optimum performance.
- Roller motors: 680-820cc
- Max. opening: 630 mm
- Feed speed: 0-6 m/s
- Feeding force: 33 kN
- Proportional pressure:: Yes
Cutting
The SuperCut 150 is a very powerful saw unit with integrated chain lubrication and hydraulic tensioning of the chain. Together with SP’s QuickCut, this optimises cutting time and minimises the risk of cutting cracks.
- Cutting diameter: 700 mm
- Chain speed: 40 m/s
- Saw motor: 32 cc
- Saw unit: SuperCut 150
Top saw (option)
- Cutting diameter: 350 mm
- Chain speed: 40 m/s
- Saw motor: 20 cc
- Saw unit: JPS
Delimbing
Proportional pressure on delimbing knives, individual settings for different species for optimum performance.
- Movable knives: 4
- Fixed knives: 1
- Delimbing dia. incl. lower knife 510 mm
- Minimum delimbing diameter: 30 mm
- Proportional pressure Yes
- LogHold: Yes
Weight and dimensions
In spite of its large timber handling capacity the SP 661 LF has a minimum width of only 1360 mm which makes it suitable for more than just large diameter cuttings.
- Width closed: 1360 mm
- Width open: 1820 mm
- Height: 1730 mm
- Weight: 1450kg
Recomendations
Carriers
The SP 661 LF can be installed with good result on both large wheel based carriers, excavators in the 16-25 ton range as well as tracked harvesters.
Felling
Proportional pressure on delimbing knives, individual settings for different species for optimum performance.
- Optimum trunk diameter*: 18 - 45 cm
- Max. rec. trunk diameter*: 51 cm
* Diameter at breast height, measured 1.3 m up the trunk.
We reserve the right to change specifications and design. Harvester heads pictured may have some extra equipment. All stated measurements/values are approximate and refer to standard equipment.
The delimbing knives are cast in high-strength steel and equipped with long cutting edges. This means that the limbs are cut off instead of being broken off. This minimizes friction during delimbing and allows the trunk to be fed through easily.
Proportional pressure ensures that the harvester head automatically works at the correct pressure in relation to tree diameter. This means that the friction between the trunk and harvester head is minimized and that the harvester head run at peak efficiency. Individual settings per tree species maximises production further.
LogHold is an evolution of proportional pressure and means that the delimbing knife pressure against the trunk can be reduced, without the risk of the trunk being dropped. If the trunk is about to fall, LogHold regulates the knife pressure so that the trunk is held in the right position. The amount by which the diameter may increase before LogHold takes action is set in the control system. No additional sensors are required.
This smart solution means that when the harvester head is fully open, i.e. at maximum tree size, the feed rollers are at their greatest angle and provide maximum carrying force against the trunk. As the feed rollers carry the trunk, the pressure on the delimbing knives can be reduced, which means less friction and the harvester head can feed the trunk through quickly and easily.