Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
2. Rundown brake
In accordance with the latest regulations, this chain saw
is equipped with a mechanical rundown brake. This
brake is connected to the chain brake and stops the
running chain after the chain saw has been switched off.
It is activated by releasing the ON/OFF switch. The
rundown brake avoids injuries through the coasting of
the chain.
3. Safety starting lock
The starting delay that is effective for about 3 sec. after
each switch-off of the chain saw provides for additional
safety.
Thus, for your own safety, there is a delay of 3 seconds
before the device can be switched on again after each
time it is switched off.
Only after this phase, the saw may be operated again by
pushing the locking button 15 and subsequently activat-
ing the operating switch 9, as described in the section
'Switching on'.
4. Chain catch bolt (Fig. 8)
This chainsaw is fitted with a chain catch bolt (17). If the
chain breaks when the saw is in operation, the chain bolt
will catch the loose chain end and thus prevent injury to
the operator's hand.
Instructions on working properly with the
chain saw
(Fig. 9 - 15)
a) Felling a Tree
When bucking and felling operations are being per-
formed by two or more persons, at the same time, the
felling operation should be separated from the bucking
operation by a distance of at least twice the height of the
tree being felled. Trees should be felled in a manner that
would endanger any person, strike any utility line, the util-
ity company should be notified immediately.
The chain saw operator should keep on the uphill side
of the terrain as the tree is likely to roll or slide downhill
after it is felled.
A retreat path should be planned and cleared as nec-
essary before cuts are started. The retreat path should
extend back and diagonally to the rear of the expected
line of fall as illustrated in Figure 9.
Before felling is started, consider the natural lean of the
tree, the location of larger branches and the wind direc-
tion to judge which way the tree will fall.
Remove dirt, stones, loose bark, nails, staples, and wire
from the tree where felling cuts are to be made.
b) Notching Undercut
Make the notch 1/3 the diameter of the tree, perpendicu-
lar to the direction of fall as illustrated in 10. Make the
lower horiziontal notching cut first. This will help to avoid
pinching of either the saw chain or the guide bar when
the second notch is being made.
c) Felling Back Cut
Make the felling back cut at least 2 inches (50 mm) high-
GB | Operating Instruction
er than the horizontal notching cut as illustrated in Figure
10. Keep the felling back cut parallel to the horizontal
notching cut. Make the felling back cut so enough wood
is left to act as a hinge. The hinge wood keeps the tree
from twisting and falling in the wrong direction. Do not cut
through the hinge.
As the felling cut gets close to the hinge the tree should
begin to fall. If there is any chance that the tree may not
fall in the desired direction or it may rock back and bind
the saw chain, stop cutting before the felling back cut is
complete and use wedges of wood, plastic or aluminium
to open the cut and drop the tree along the desired line
of fall.
When the tree begins to fall remove the chain saw from
the cut, stop the motor, put the chain saw down, then use
the retreat path planned. Be alert for overhead limbs fall-
ing and watch your footing.
d) Limbing a Tree
Limbing is removing the branches from a fallen tree.
When limbing, leave larger lower limbs to support the log
off the ground. Remove the small limbs in one cut as il-
lustrated in Figure 11. Branches under tension should be
cut from the bottom up to avoid binding the chain saw.
e) Bucking a Log
Bucking is cutting a log into lengths. It is important to
make sure your footing is fim and your weigth is evenly
distributed on both feet. When possible, the log should
be raised and supported by the use of limbs, logs or
chocks. Follow the simple directions for easy cutting.
When the log is supported along its entire length as il-
lustrated in Figure 12, it is cut from the top (over-buck).
When the log is supported on one end, as illustrated in
Figure 13, cut 1/3 the diameter from the underside (un-
derbuck). Then make the finished cut by overbucking to
meet the first cut.
When the log is supported on both ends, as illustrated
in Figure 14, cut 1/3 of that diameter from the top over-
bruck. Then make the finished cut by underbucking to
meet the first cut.
When bucking on a slope always stand on the uphill
side of the log, as illustrated in Figure 15. When "cutting
through", to maintain complete control release the cutting
pressure near the end of the cut without relaxing your
grip on the chain saw handles. Don't let the chain con-
tact the ground. After completing the cut, wait for the saw
chain to stop before you move the chain saw. Always
stop the motor before moving from tree to tree.
f) Spiked bumper (Fig. 16)
• Use a spiked bumper when cutting trees and thick
branches can ensure your safety and decrease the
working strength and vibration level.
• Dig the spiked bumper into the log and use it as a
pivot. Cut with an arched motion to make the bar pen-
etrate the wood.
• Repeat several times if necessary, changing the point
where you plant the spiked bumper.
GB-8
Publicité
Table des Matières
