The 761 LF is the heavier answer to the same question the 661 LF poses. At roughly 1,792 kg with 45 kN of feed force and 800 mm cutting capacity, it is specified for heavy softwood, crooked hardwood and processing that defeats lighter heads — material where holding and pulling the stem is harder than cutting it.
Its published optimum range of roughly 250-500 mm DBH, depending on configuration, sits higher than the 661's. That is the practical distinction between the two heads: not that one cuts bigger, but that each is designed to be most productive in a different part of the stem distribution.
Indicative published manufacturer and distributor information. Confirm every figure, lift chart and hydraulic requirement with the manufacturer or authorised dealer before purchase.
A specification table tells you what the machine is. This is what each of those numbers means for the work you would put it to.
Each of these can fail independently, and passing one says nothing about the others. Weight class alone is the weakest of the four and the one most often relied on.
Beyond the standard buying criteria for the class, these are the questions this machine in particular raises.
The case for the heavier head is throughput on difficult material, and it has to be earned against its own higher capital and carrier requirement. Where stems are straight and uniform, the lighter head will frequently deliver a better cost per cubic metre despite lower capability.
Consumable consumption rises with both throughput and material difficulty. Crooked hardwood works knives, rollers and chains harder than clean softwood, so budget from experience in your species rather than from a general figure.
Carrier requirement is part of the head's cost. A head that needs a heavier carrier has effectively raised the capital of the whole combination, and that belongs in the comparison against a lighter head on a smaller machine.
The 661 and 761 are not better and worse; they are optimised for different bands. Run your stand's volume distribution against both published optimum ranges before assuming the heavier head is the safer choice.
Weight, minimum pump capacity and working pressure all have to be met continuously. Check the carrier's continuous auxiliary flow and the lift chart with the head fitted at working reach.
Roller and knife configuration should be specified for the species and, where relevant, the mill's debarking specification. This matters more than the choice between comparable heads from different manufacturers.
Other harvester heads covered in this guide.
Heavy processor head for demanding hardwood and softwood, 815 mm butt-saw capacity on a 27 t+ carrier.
The clearest published case for optimum over maximum: 700 mm cutting capacity, 160-510 mm best production.
Excavator-class harvesting head for ~21-25 t carriers, with eucalyptus roller configurations available.
The heavier Log Max head for ~25-30 t carriers — more capacity and feed force, at 555 kg more mass.
The highest-volume softwood configuration, and the one with the greatest exposure to bottleneck mismatch. Either a full-tree chain or a cut-to-length pair, depending on terrain, mill requirements and contamination tolerance.
Thinning rewards manoeuvrability and restraint. The corridors are narrow, the residual crop has real future value, and the largest machine on the market is usually the wrong answer.
Australian hardwood plantation work places very different demands on a head from radiata pine. Feed force, debarking and durability dominate the specification.