469861_c 39
Working behaviour and working technique
13.3 Testing the chain brake
Procedure see chapter 12.5 "Testing the function
of the chain brake", page37.
WARNING! Danger of fatal injury and
danger of extremely severe injury due to a de-
fective chain brake. Extremely serious injury
and even fatal injury of the operator can be
caused if the chain brake does not function, e.g.
due to kickback by the running saw chain.
■
Check the chain brake each time before
starting work.
■
Do not switch the chain saw on if the chain
brake is defective. in this case, have the
chain saw checked in a customer service
workshop.
13.4 Switching the engine on and off
CAUTION! Danger of hearing impair-
ment! The operation of the chain saw causes in-
tense noise that can cause hearing impairment.
■
During work with the chain saw, wear ear de-
fenders.
NOTE Release the chain brake each time
before switching on the chain saw.
Switching on the engine:
1. Release the chain brake.
2. Press and hold locking button (01/8) with
your thumb.
3. Press and hold the throttle lever (01/7).
4. Release the locking button (01/8). It is not
necessary to keep the locking button pressed
once the chain saw has started. The locking
button is intended to prevent inadvertent
starting of the chain saw.
Switching off the engine:
1. Release the throttle lever (01/7).
14 WORKING BEHAVIOUR AND
WORKING TECHNIQUE
NOTE Courses in the use of chain saws
and techniques for felling trees are regularly held
by various forestry organisations.
DANGER! Danger of fatal injury due to
inadequate technical knowledge! Inadequate
technical knowledge can result in extremely seri-
ous up to fatal injury!
■
Only trained and experienced people are al-
lowed to fell trees and lop branches.
DANGER! Danger of fatal injury from
splintered wood! Wood chips caught up in the
chain can cause extremely serious and even fatal
injury!
■
Remove loose chips and wood splinters from
the part to be sawn.
14.1 Felling trees
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° backwards from the falling di-
rection (17).
■
The trunk must be free from growth, branch-
es and foreign bodies (e.g. dirt, stones, loose
bark, nails, staples, wire, etc.).
Make two undercuts and one back cut in order to
fell 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 (18/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 (18/E). The depth of
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