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SP Maskiner - Model SP 461 LF -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 10 – 25cm ( 4-10”) dbh, but is thanks to the LF principle also capable of efficiently working with larger tree sizes.
- Weight: 726kg
- Cutting diameter: 53cm
- Optimum tree size (DBH) for highest productivity: 8-35cm
- Recommended working pressure: 23-25MPa
Hydraulics
- Min. pump capacity: 185 l/min
- Rec. working pressure: 23 - 25 MPa
Feeding
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
Cutting
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
Delimbing
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
Weight and dimensions
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
Recommendations
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 trunk diameter*: 10 - 25 cm
- Max. rec. trunk diameter*: 35 cm
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.