SP 461 LF - A big little harvester head
The SP 461 LF is a very fast, nimble high performance harvester head. It is designed according to SP´s Low Friction principle for minimum friction and maximum productivity. The SP 461 LF is perfectly suited to work on midsize thinning carriers with long reach as well as smaller in stand thinning carriers.
Fast feeding in combination with low weight and very compact measurements ensures highest efficiency and productivity even in dense small diameter thinning. In larger diameter thinning the clever SP patents LogHold and proportional angled feed rollers gives the SP 461 LF an impressive handling and capacity. The SP 461 LF is in all respects - a big little harvester head.
The SP 461 LF reaches top performance in stands with a diameter of 8 – 35cm (3 - 14”) dbh, but is thanks to the LF principle also capable of efficiently working with larger tree sizes.
Technical data
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.
| Metric | |||
| Min. pump capacity: | 185 l/min | ||
| Rec. working pressure: | 23 - 25 MPa |
| Proportional clamping pressure of the feed rollers in relation to trunk diameter, individual settings for different species for optimum performance. | |||
| Roller motors: | 398 cc | ||
| Max. opening: | 420 mm | ||
| Feed speed: | 5 m/s | ||
| Feeding force: | 18 kN | ||
| Proportional pressure: | Yes | ||
| The SuperCut 100 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: | 530 mm | ||
| Chain speed: | 40 m/s | ||
| Saw motor: | 20 cc | ||
| Saw unit: | SuperCut 100 | ||
| QuickCut: | Yes | ||
| Proportional delimbing knife pressure in relation to trunk diameter for minimum friction and maximum production. Individual setting of upper/lower knives and for different tree species for optimum performance. | |||
| Movable knives: | 4 incl. top knife | ||
| Fixed knives: | 1 | ||
| Delimbing diameter tip to tip: | 350 mm | ||
| Min. delimbing diameter: | 30 mm | ||
| Proportional pressure: | Yes | ||
| LogHold: | Yes | ||
| With extremely compact measurements and low weight, the SP 461 LF is perfectly suited for thinning operations in dense stands. | |||
| Width closed: | 850 mm | ||
| Width open: | 1130 mm | ||
| Height: | 1230 mm | ||
| Weight: | 726 kg | ||
| Carriers | |
| The SP 461 LF can be fitted to a variety of different carriers such as conventional forest machines and excavators. In order to ensure good function, please consult your nearest SP dealer or SP staff. | |
| Felling | |
| Proportional clamping pressure of the feed rollers in relation to trunk diameter, individual settings for different species for optimum performance. | |
| Optimum tree size (DBH) for highest productivity*: | 8 - 35 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.
LF – Maximum production and minimum friction
Four smart solutions and patent for increased profitability:
Knife Design
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
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.
SP patent
LogHold
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.
Proportionally angled feeder rollers
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.
Accessories and equipment
All of our harvester heads come with a high level of equipment as standard. However, a number of different accessories are available in order to optimise the harvester head for different needs, carriers and felling conditions. The most common accessories are described below.
For more information about accessories, please contact your nearest SP dealer or SP Maskiner.
Colour marking SUPERMARK
Multi-tree equipment
Feed rollers
ICE saw box
Complete measurement and control system
Control Systems
Compatible with most control systems
SP 661 LF can be used with virtually all control systems on the market. Through a simple adaptation the SP 661 LF can be used together with the following systems:
- Dasa280
- Dasa380
- Dasa4
- Dasa4 Compact
- Dasa Forester
- John Deere Timbermatic
- Motomit IT
- Motomit PC
- Komatsu MAXI
- Ponsse Opti
- Technion
- Techno Matic
- TOC-MD
Complete control systems
SPd5Bucking
SPd5Bucking is a complete measurement and control system for control of the felling process in a forest harvester in accordance with StanForD. This is our most advanced system and has support for value bucking. The system is also fully integrated with dasa5 control and communication system. All communication with the operator is via dxPc, which is a mobile PC with Windows 10 operating system, and stores all information, e.g. statistics or instructions. The dxPc computer has a touchscreen, which facilitates the work for the operator considerably.
SPd5BuckingPrio
SPd5BuckingPrio is our intermediate system. The system has support for priority bucking and is equipped with a PC. SPd5BuckingPrio is a slightly impler bucking system combined with the power of a PC for reporting, communication and other programs. Bucking is based on priority lengths with or without diameter classes. SPd5BuckingPrio is ideal when value bucking and reporting is not required according to StanForD at the same time as needing a PC for reporting, communication and other PC-programs. All communication to the operator occurs via dxPc.
SPd5BuckingPrio-C
SPd5BuckingPrio-C is a bucking system that focuses on simplicity without compromising on head control, performance or productivity. SPd5BuckingPrio-C has support for priority bucking with or without diameter classes and has been specially developed for felling where there is no need for wireless production reporting or the use of PC programs. SPd5Bucking Prio-C runs the Windows CE operating system.
SPd5 cab box
Regardless of which system you choose above, you can get it with our SPd5 cab box. The cab box allows SPd5 cab modules do be installed quickly, efficiently and at the highest quality. The cab box is factory-fitted at SP and delivered completely finished and tested together with the head, which ensures a correct connection and trouble-free commissioning. Thanks to the electronics modules being mounted in a protected environment inside the box, problems caused by external damage such as moisture, dust, dirt and impact are minimized.
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