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Working behaviour and working technique
6. At the end of sawing work, immediately re-
move your ear defenders and listen out for
signals or warning calls.
Only experienced or trained people should make
plunge cuts, longitudinal cuts and boring cuts (11).
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.
7.2
Delimbing (12)
Delimbing is the separation of branches from the
felled tree. Observe the following points:
■
Support the chain saw against the tree trunk
with the bumper spike during the work.
■
Leave larger, downward-pointing branches
supporting the tree standing at first.
■
Cut off smaller branches with one cut.
■
Saw off branches systematically and sequen-
tially from the tree (12/a). First, saw off any
branches that might hinder you. Then cut off
the branches that create tension. Finally saw
off the main branch at the base.
■
Saw off free-hanging branches from above
(12/b), but not from below.
■
Pay attention to branches under tension, and
saw through these from underneath upwards
(12/c) in order to avoid the chain saw becom-
ing trapped.
7.3
Cross-cutting (13 – 16)
Cutting to length means dividing the felled tree in-
to sections. Observe the following points:
■
Ensure that your feet are stable and that your
body weight is evenly distributed over both
feet. If possible, the trunk should be backed
and supported by branches, beams or wedg-
es.
443162_a
■
When working on a slope, always stand uphill
from the tree trunk, because it could roll away
(13).
■
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.
■
In order to maintain full control of the chain-
saw at the moment of sawing, reduce the
contact pressure towards the end of the cut
without releasing the tight hold on the chain-
saw handles.
■
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 motor 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 (14/
a), without cutting into the ground.
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 (15/a),
then saw through the remainder from above,
down as far as the cut made from underneath
(15/b).
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 (16/a), then saw
through the remainder from underneath, up as far
as the cut made from above (16/b).
DANGER! Danger of fatal injury due to
kickback! The operator can be fatally injured by
kickback of the appliance.
■
It is essential to comply with the measures in
order to avoid any kickback.
7.4
Cutting converted timber
Heed the following points during this work:
■
Use a secure cutting surface (sawing trestle,
wedges, beams).
■
Make sure you are standing securely and
that your bodyweight is evenly distributed.
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