Stihl MSA 161 T Notice D'emploi page 17

7 Basic Working Technique
suddenly and with great force, propelling the
limb or chain saw into the saw operator, caus‐
ing injury or loss of control.
■ To reduce the risk of severe or fatal personal
injury from reactive forces, including kickback,
or loss of control when cutting wood under
tension:
► Always start with a relieving cut (1) at the
compression side (A) of the branch, and
then make a bucking cut (2) at the tension
side (B).
► If a pinch occurs that traps the bar/chain,
switch off the motor, activate the chain
brake, remove the battery and remove the
saw from the branch, exercising caution
that the limb does not suddenly snap or
release.
7.4 Blocking - Removing Sections
from a Standing Tree
7.4.1 Conventional Notch
WARNING
■ These in-tree instructions apply to STIHL top-
handle chain saws, designed exclusively for
professional, in-tree use. For basic instructions
on felling a tree from the ground, please see
the instruction manual for your STIHL rear-
handle chain saw.
■ These basic working techniques are not meant
to substitute for the judgment of an experi‐
enced professional with direct knowledge of
on-site conditions. A different type of notch or
working technique may be appropriate for your
particular circumstance. Always exercise good
professional judgment and discretion in deter‐
mining how to safely complete a cutting task.
A
The notch (A) determines the direction of fall.
Make the notch perpendicular to the desired line
of fall. Be aware of conditions such as wind, tree
lean, the slope of the terrain and other factors
that could alter the direction of fall.
For a conventional notch:
0458-791-8221-D
A
► First, cut down at a 45 degree angle to a depth
of approximately 1/5 to 1/4 of the trunk diame‐
ter.
► Then make a horizontal cut that meets the bot‐
tom of the first cut.
► Remove the resulting 45 degree piece.
7.4.2 Back Cut
B
C
A
► Begin the back cut (C) on the same level as
the bottom of the notch (A).
► Cut horizontally toward the notch.
► Leave approximately 1/10 of the tree's diame‐
ter uncut (B). This is the hinge.
► Do not cut through the hinge – you could lose
control of the direction of fall.
When removing sections of a tree:
► Make sure all bystanders are clear of the area
before starting work.
► Maintain adequate distance from the nearest
structure to prevent property damage from fall‐
ing material.
► Take extra precautions in the vicinity of roads,
railways and power lines. Inform the police,
utility company or railway authority before
beginning to cut.
WARNING
■ Never cut through the hinge when making
your back cut. The hinge helps control the fall
of the tree. Cutting through the hinge will elimi‐
nate your ability to control the fall and may
result in serious or fatal personal injury or
property damage.
■ In order to reduce the risk of personal injury,
never position yourself directly behind the
trunk when it is about to fall, since part of the
English
A B C
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