Felling Back Cut - Stihl Msa 300.1 Notice D'emploi

8 Proper Techniques for Basic Bucking, Limbing, Pruning and Felling
► Make cuts at both sides of the trunk, at the
same height as the subsequent felling back
cut.
► Cut no more than the width of guide bar.
8.6.6

Felling Back Cut

WARNING
■ If the tip of the bar contacts a wedge that has
been used to help keep the kerf or cut open, it
may cause kickback. Wedges should be of
wood or plastic and never steel, which can
damage the chain.
■ Whichever felling method you select, never cut
through the hinge when making your felling
back cut. The hinge helps control the fall of the
tree. Cutting through the hinge will eliminate
the feller's ability to control the tree's fall and
may result in serious or fatal personal injury or
property damage.
■ In order to reduce the risk of personal injury,
never stand directly behind the tree when it is
about to fall, since part of the trunk may split
and come back towards the operator (barber-
chairing), or the tree may jump backwards off
the stump.
■ 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-plan‐
ned 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:
0458-009-8203-B
► 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 exam‐
ple, if a tree tends to "sit back," causing a bind
of the saw, wedges can be used to re-position
it.
8.6.7
Use the simple fan cut for making the felling back
cut on trees with a diameter less than the effec‐
tive 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 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.
8.6.8
■ 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 inexper‐
ienced with a chain saw, plunge-cutting should
not be attempted. Seek the help of a profes‐
sional.
D
Use the sectioning method for making the felling
back cut on trees with a diameter more than the
effective cutting length of the guide bar.
Fan Cut
Sectioning Method
WARNING
English
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