Stihl MS 261 Manual De Instrucciones página 33

7 Proper Techniques for Basic Bucking, Limbing, Pruning and Felling
￭ Always keep to the side of the falling tree. When the tree
starts to fall, withdraw the bar, release the trigger switch,
engage the chain brake and walk away briskly on the pre-
planned escape path.
￭ Watch out for limbs falling from the felled tree.
￭ Be extremely careful with partially fallen trees. When the
tree hangs or for some other reason does not fall
completely, set the saw aside and pull the tree to the
ground with a cable winch, block and tackle or tractor.
Trying to cut it down with your saw is extremely dangerous
and may result in serious or fatal injury. Trees of this
nature can fall suddenly and often are under tension.
The tree is brought down with the felling back cut (D).
D
For both conventional and open-faced notches:
► Begin 1 to 2 in. (2.5 to 5 cm) higher than the bottom of the
felling notch.
► Cut horizontally toward the felling notch.
► Leave approximately 1/10 of the diameter of the tree
uncut. This is the hinge (E) that will help control the fall of
the tree.
► Do not cut through the hinge because you could lose
control of the direction of the fall.
► If necessary, wedges can be driven into the felling back
cut to keep the cut open and to help control the direction
of the fall. For example, if a tree tends to "sit back,"
causing a bind of the saw, wedges can be used to re-
position it.
0458-573-8621-D
7.5.7 Fan Cut
Use the simple fan cut for making the felling back cut on
trees with a diameter less than the effective cutting length of
the guide bar.
► After creating the felling notch, engage the bumper spikes
of the chain saw directly behind the location of the
intended hinge and 1 to 2 in. (2.5 to 5 cm) higher than the
bottom of the felling notch. Pivot the saw around this point
D
only as far as the back of the hinge. Do not cut through the
hinge. The bumper spike should roll against the trunk until
the back cut is complete.
7.5.8 Sectioning Method
WARNING
This method is extremely dangerous because it involves the
use of the nose of the guide bar and can result in kickback.
If you are inexperienced with a chain saw, plunge-cutting
should not be attempted. Seek the help of a professional.
English
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