Felling - Stihl MS 261 Manual De Instrucciones

English
￭ To reduce the risk of injury:
– Never stand directly underneath the branch you are
cutting.
– Watch for falling branches. As soon as the branch
starts to fall, step aside and keep a sufficient
distance away from the falling wood. A branch may
spring back at you after it hits the ground.
– Prior to beginning work, clear the work area of limbs
and brush to reduce the risk of tripping and losing
control of the chain saw.
To cut branches from a standing tree:
1
► Make the first cut (1) on the underside of the branch,
approximately 2 in. (5 cm) from the trunk. Cut through
approximately 1/4 of the diameter of the branch. This will
help prevent the branch from splintering after it is cut.
► Make the second cut (2) on the top side of the branch,
approximately 2 in. (5 cm) from the first cut.
► As soon as the branch starts to fall, withdraw the chain
saw and let the branch fall to the ground.
7.5

Felling

7.5.1 Felling Conditions
Felling is cutting down a tree. Before felling a tree, carefully
consider all of the conditions that may affect the direction of
fall.
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2
7 Proper Techniques for Basic Bucking, Limbing, Pruning and Felling
WARNING
￭ Before starting the felling operation, make sure the saw
you are using has sufficient size, power and adequate fuel
to complete the felling operation efficiently.
￭ There are a number of factors that may affect and change
the intended direction of fall, e.g. wind direction and
speed, lean of tree, surrounding trees and obstacles,
sloping ground, one-sided limb or foliage structure, wood
structure, decay, snow load, etc.
– To reduce the risk of severe or fatal injury to yourself
or others, look for, analyze and plan for these
conditions prior to beginning the cut, and be alert for
a change in direction while the tree is falling.
￭ Felling a tree that has a diameter greater than twice the
effective cutting length of the guide bar requires use of
either the sectioning felling back cut or plunge-cut
method. These methods can be extremely dangerous
because they involve the use of the nose of the guide bar
and can result in kickback. Only properly trained
professionals should attempt these techniques. If you are
inexperienced with a chain saw, plunge-cutting should not
be attempted. Seek the help of a qualified professional.
￭ Before starting any felling operation, make sure the saw
you are using has sufficient size, power and adequate fuel
to complete the felling operation. Never attempt to fell a
large diameter tree with a chain saw that lacks the bar
length, power or run-time to complete the task efficiently.
￭ Trees that are split, decayed or rotted inside or that are
leaning or otherwise under tension are more likely to snap
or split while being cut, causing serious or fatal injury to
the operator or bystanders.
– Always observe and be aware of the general
condition of the tree.
– Inexperienced users should never attempt to cut
such trees.
– Also look for broken or dead branches which could
vibrate loose and fall on the operator during the
felling operation. Certain types of trees are more
susceptible to this condition, such as Douglas firs.
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