Stiga A 180 E, Руководство оператора

Страница: 101 / 360

USING THE MACHINE 11
EN
• Felling back cut
– Make the felling back cut at least 50 mm higher
than the horizontal notching cut as illustrated
in Figure 16. Keep the felling back cut parallel
to the horizontal notching cut. Make the fell -
ing 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 gets close to the hinge, the tree
should begin to fall. If there is any chance that
the tree may not fall in 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 falling and watch
your footing.
• Limbing a tree
Limbing is removing the branches from a fallen
tree. When limbing leave larger lower limbs to sup -
port the log off the ground. Remove the small limbs
in one cut as illustrated in Figure 17. Bran ches
under tension should be cut from the bottom up to
avoid binding the chain saw.
WARNING! Be careful of where the
bran ches are lying on the ground, the risk of
them being under tension, the direction the
branch may go during cutting and the risk of
the tree being unstable after the branch has
been cut.
• Bucking a log
Bucking is cutting a log into lengths. It is important
to make sure your footing is firm and your weight 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 illustrated in Figure 18A, it is cut from the top
(overbuck).
– When the log is supported on one end, as illus -
trated in Figure 18B, cut 1/3 the diameter from
the underside (underbuck). Then make the
finished cut by overbucking to meet the first cut.
– When the log is supported on both ends, as
illustrated in Figure 18C, cut 1/3 the diameter
from the top (overbuck). Then make the finished
cut by underbucking the lower 2/3 to meet the
first cut.
– It is easier to saw a log using the spiked bum per
(Figure 18D) .
• Dig the spiked bumper into the log and use it
as a pivot. Cut with an arched motion to make
the bar penetrate the wood.
• Repeat several times if necessary, changing
the point where you plant the spiked bum per.
– When bucking on a slope always stand on the
uphill side of the log, as illustrated in Figure 19.
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 contact
the ground.
After completing the cut, wait for the saw chain to
stop before you move the chain saw. Al ways stop
the motor before moving from tree to tree.
3. END OF OPERATIONS
When you have finished your work:
– Switch off the engine as indicated above
(Chap. 6).
– Wait for the chain to stop and allow the machine
to cool.
– Remove any traces of sawdust or oil deposits
from the chain.
– If there is excessive dirt or resin build-up, dis -
assemble the chain and place it in a container
with a specific cleanser. Then rinse it with clean
water and treat it with a suitable anticorrosive
spray, before reassembling on the machine.
– Fit the bar cover before reassembling the ma -
chine.
WARNING! Allow the engine to cool
be f ore storing in any enclosure.
To reduce fire hazards, clean the machine
thoroughly to get rid of any sawdust, branches,
leaves or excess grease, never leave contain ­
ers with the cut debris inside the storage area.