AL-KO Solo 6646, Instructions For Use Manual

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Working behaviour and working technique
i.e. the saw chain and guide rail – is blocked
while the engine is running, there is a risk of inju-
ry and risk of damaging the device.
■
Switch off the engine and pry open the cut
(with a wedge, for example), or make a relief
cut using a second chain saw or cutting ap-
paratus. Remove the jammed cutting appara-
tus as soon as the cut opens up.
■
Follow the instructions and procedures stated
in the following sections to avoid blocking or
jamming of the chainsaw.
NOTE Courses in the use of chain saws
and techniques for felling trees are regularly held
by various forestry organisations.
7.1 Using the bumper spike (13)
1. Stick the bumper spike (13/1) into the trunk
and make an arc motion with the chain saw
(13/a) so that the chain saw cuts into the
wood.
2. Repeat this work step several times, moving
the point of contact of the bumper spike (13/b).
7.2 Felling trees (14, 15)
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.
NOTE Only use wedges made from wood,
plastic or aluminium.
Take the following measures before starting fell-
ing work.
■
Make sure that no other people, animals or
objects are in the danger area.
■
The safe distance from other workplaces or
objects should be at least 2½ tree lengths.
■
Watch out for power lines and other people's
property. If necessary, notify the power sup-
ply company or the property owner.
■
Judge the falling direction of the tree.
Factors influencing the falling direction of the
tree:
■
Natural lean of the tree
■
Height of the tree
■
Branches growing on one side
■
Level ground or slope
■
Asymmetrical growth, wood damage
■
Wind direction and wind speed
■
Snow load
■
When working on a slope, always work uphill
of the tree to be felled.
■
Establish your escape route in advance, and
make sure that there are no obstacles in the
way. The escape route should be at an angle
of approx. 45° diagonally behind the falling
direction (14).
■
The trunk must be free from growth, branch-
es and foreign bodies (e.g. dirt, stones, loose
bark, nails, staples, wire, etc.).
Make an undercut a back cut in order to cut down
a tree.
1. During back cuts and cross-cuts, place the
bumper spike firmly against the wood to be cut.
2. Saw the first undercut (15/c) horizontally,
then the second undercut at an angle of at
least 45° from above. This prevents the chain
saw becoming trapped when you make the
second undercut. The undercut must be as
close as possible to the ground and in the re-
quired felling direction (15/E). The depth of
the undercut should be about 1/4 of the diam-
eter of the trunk.
3. Cut the back cut (15/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 (15/c) sufficiently deep
so that a bridge (15/f) of at least 1/10 the
trunk diameter remains between the undercut
(15/C) and the back cut (15/d). This bridge
prevents the tree from twisting and falling in
the wrong direction. The tree should start to
fall when the back cut (15/d) approaches the
bridge (15/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