GB
40 CS 4030
Working behaviour and working technique
the undercut should be about 1/4 of the diam-
eter of the trunk.
3. Cut the back cut (18/D) exactly horizontally
opposite to the undercut. The back cut must
be made 3-5 cm above the horizontal under-
cut.
4. Saw in the back cut (18/D) sufficiently deep
so that a bridge (18/F) of at least 1/10 the
trunk diameter remains between the undercut
(18/C) and the back cut (18/D). This bridge
prevents the tree from twisting and falling in
the wrong direction. The tree should start to
fall when the back cut (18/D) approaches the
bridge (18/F).
If the tree falls whilst you are sawing:
■
Interrupt the back cut if the tree does fall
in the wrong direction or leans back and
traps the chain saw. To open the cut and
fell the tree, drive in wedges in the direc-
tion of the required felling line.
■
Immediately pull the chain saw from the
cut, switch it off and put it down.
■
Walk away in the direction of the escape
route.
■
Watch out for falling branches and twigs.
5. If the tree remains standing, drive wedges in-
to the back cut in order to cause it to fall in a
controlled way.
6. At the end of sawing work, immediately re-
move your ear defenders and listen out for
signals or warning calls.
NOTE Only use wedges made from wood,
plastic or aluminium.
DANGER! Danger of fatal injury from a
falling tree! Having no escape route when felling
a tree represents a danger of serious and even
fatal injury!
■
Do not start the felling work until you are sure
there is an unobstructed escape route away
from the tree to be felled.
DANGER! Danger of fatal injury from an
uncontrollably falling tree! Uncontrolled falling
trees can lead to extremely serious and even fa-
tal injury!
■
In order to guarantee controlled felling of a
tree, leave a bridge between the undercut
and the back cut. The length of this bridge
should be approx. 1/10 of the trunk diameter.
■
Do not carry out any felling work in windy
conditions.
14.2 Branch lopping
Heed the following points during this work:
■
Support the chain saw against the tree trunk
during the work.
■
In the preliminary phase, leave larger, down-
ward-pointing branches that are supporting
the tree (19).
■
Cut off smaller branches with one cut.
■
Pay attention to branches under tension, and
saw through these from underneath upwards
in order to avoid the chain saw becoming
trapped (19).
■
Do not saw off free-hanging branches from
underneath.
■
Only experienced or trained people should
make plunge cuts, longitudinal cuts and bor-
ing cuts (18).
14.3 Cross-cutting
Heed the following points during this work:
■
When working on a slope, always stand uphill
from the tree trunk, because it could roll away
(19).
■
Guide the chain saw so that there is no part
of your body in the extended sweep arc of
the saw chain.
■
Position the bumper spike directly adjacent to
the cut edge and allow the chain saw to pivot
about this point. Do not exert any pressure at
the end of the cut.
■
Make sure that the saw chain does not touch
the ground.
■
At the end of the cut, wait for the saw chain
to come to a halt before you remove the
chain saw.
■
Always switch off the engine of the chain saw
before you go to the next tree.
The entire length of the tree trunk is in contact
with the ground:
■
Saw through the tree trunk from above, with-
out cutting into the ground (20).
Tree trunk is lying raised at one end:
■
To prevent the chain saw becoming trapped
and the wood splintering, first saw through
1/3 of the trunk diameter from below, then
saw through the remainder from above, down
as far as the cut made from underneath (10).
Tree trunk is lying raised at both ends:
To prevent the chain saw becoming trapped and
the wood splintering, first saw through 1/3 of the
trunk diameter from above, then saw through the
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