SP 661 LF logo

SP 661 LF - fast, versatile and reliable

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, allow for maximum capacity and productivity. When harvesting smaller diameter trees the compact and agile design is a great asset. Equipped with the optional Multi tree 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 fast, versatile and reliable. The SP 661 LF reaches top performance in stands with a diameter of 16 to 51 cm (6 – 20”) dbh but is thanks to the LF principle also capable of efficiently working with larger tree sizes.

LF – Maximum production and minimum friction

Four smart solutions and patent for increased profitability:

Accessories and Equipment

The SP 661 LF has a vast range of different accessories in order to be able to adapt the harvester head to different needs, machines and felling conditions.

Color marking
Used to facilitate forwarding when the logs are difficult to distinguish with the naked eye.

Multi-tree equipment
SP´s multi-tree equipment makes it possible to fell and gather several trees before processing them together. A highly productive option in small diamater harvesting.

Find end sensor
Using a sensor mounted in the saw box, the harvester head automatically locates the end of the trunk at the push of a button.

Topping saw
Facilitates felling of hardwood forest with a lot of forks as well as felling of stands with multiple top-breaks.

EC - saw box (Extended Cut)
Larger saw box for increased cutting diameter to 81 cm.

Multispeed feed
Optimizes the harvester head’s relationship between feed speed and feed force for highest productivity regardless of trunk diameter.

Lighting saw box
LED lamp in the saw box for additional lighting of the work area.

FDM (Floating Diameter Measuring)
An additional measuring point that follow the movements of the top knife. This ensures a very accurate diameter measuring also during high feed speeds.

Eucalyptus kit
Debarking kit for eucalyptus trees.

Feed rollers
Feed rollers in several designs available to suit different conditions and needs.


The SP 661 LF is designed to offer the highest level of reliability and productivity.

Technical data


Metric US
Min. pump capacity: 200 l/min 52 gpm
Rec. working pressure: 26-30 MPa 3770-4350 psi


Proportional clamping pressure of the feed rollers in relation to trunk diameter, individual settings for different species for optimum performance.
Roller motors: 613-920 cc 37.4-56.1 cui
Max. opening: 630 mm 24.8”
Feed speed: 0-7 m/s 0-22 ft/s
Feeding force: 33 kN 8543 lbf
Proportional pressure:: Yes Yes


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 minimizes the risk of cutting cracks.
Cutting diameter standard: 700 mm 27.6”
Cutting diameter option EC saw box: 810 mm 32”
Chain speed: 40 m/s 131 ft/s
Saw motor: 32 cc 1.9 cui
Saw unit: SuperCut 150 SuperCut 150

Topping saw (option)

Cutting diameter: 350 mm 13.8”
Chain speed: 40 m/s 131 ft/s
Saw motor: 20 cc 1.22 cui


Delimbing knives with proportional pressure. Individual settings for different species for optimum performance.
Movable knives: 4 4
Fixed knives: 1 1
Delimbing diameter tip to tip: 510 mm 20”
Minimum delimbing diameter: 30 mm 1.18”
Proportional pressure Yes Yes
LogHold: Yes Yes

Weight and dimensions

Despite its capacity to handle large diameter trees the SP 661 LF is, thanks to its compact measurements, also capable to efficiently harvest small tree sizes.
Width closed: 1360 mm 53.5”
Width open: 1820 mm 71.6”
Height, excl. tilt frame: 1730 mm 68”
Weight, excl. rotator: 1480 kg 3262 lb
Weight with top saw, excl. rotator: 1595 kg 3516 lb



The SP 661 LF is an excellent choice for use on both wheeled harvesters, tracked harvesters as well as excavators. To inquiry about the suitability of a specific machine brand/model, please contact your SP dealer.
Optimum tree size (DBH) for highest productivity*: 160-510 mm 6-20”
* 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.

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
Control Systems

Complete control systems

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 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 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.