11
English
n
Remove dirt, stones, loose bark, nails, stapes and
wire from the tree.
n
Notching undercut (A notch cut in a tree to direct the
fall ) (Fig.10)
Make the notch 1/3 the diameter of the tree,
perpendicular to the direction of fall. Make the lower
horizontal notching cut first, this will help to avoid
pinching of either the chain or the bar when the
second notch is being made.
n
Felling back cut (the final cut in a tree felling
operation, made on the opposite side of the tree from
the notching undercut ) (Fig.10)
Make the felling back cut at least 50mm higher than
the horizontal notching cut. 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 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 aluminum to open the cut and drop
the tree along the desired line off fall. When the tree
begins to fall remove the chain saw from the cut, stop
the motor, put the chain saw down, and then use the
retreat path planned. Be alert for overhead limbs
falling and watch your footing.
n
Limbing a tree (Fig.11)
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. Branches under tension should be cut from the
bottom up, to avoid binding the chain saw.
n
Bucking a log (The process of cross cutting a felled
tree or log into lengths) (Fig.12-15) 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 or logs.
Follow the simple direction for easy cutting:
a) When the log is supported along the entire length,
it is cut from the top (overbuck). (Fig.12)
b) When the log is supported on one end, cut 1/3 of
the diameter from the underside (underbuck). Then
make the finished cut by overbucking to meeting
the first cut. (Fig.13)
c) When the log is supported on both ends, cut 1/3 of
that diameter from the top (overbuck). Then make
the finished cut by underbucking the lower 2/3 to
meet the first cut. (Fig.14)
d) When bucking on a slope always stand on the
uphill side of the log. When cutting through, to
maintain complete control, release the cutting
pressure near the end of the cut without relaxing
your grip on the chainsaw handles. (Fig.15)
Do not let the chain contact the ground. After completing
the cut, wait for the chain to stop before you move the
chainsaw. Always stop the motor before moving from tree
to tree.
MAINTENANCE
(Fig. 16-21)
Chain Sharpening
When the chain penetrates into wood with difficultly, it
needs sharpening as follows:
n
Put the chain under tension.
n
Fasten the bar in a vice so that the chain can slide.
n
Fasten the file to the file holder and place it on cutter
at a 35° angle.
n
File with forward strokes only until all the worn out
part of the cutting edge is taken away.
n
Count the number of strokes given to the cutter taken
as a reference basis and file away for the same
number of strokes on all other cutters.
n
If after sharpening a few times, the depth gauge
protrudes from the template, you must reset its level
using a flat file.
n
Finally, round off the depth gauge.
NOTE:
We advise you to have the deep or important
sharpening carried out by a service agent who is
equipped with an electric sharpener.
Guide bar maintenance
n
When you have finished working, clean out the
groove and the oil passages, with a scraping hook.
n
Periodically trim the sides of the bar rails using a flat
file.
n
If not done in the long run, the feathered edges might
break away and damage the bar.
n
If one rail is higher than the other one, it is necessary
to make it even with a flat file and then smooth them
with a file or fine grain abrasive paper.
Oil tank maintenance
To prevent dirt getting inside the tank, clean the oil tank
cap before opening. Check the contents of the oil tank
during sawing work by checking the oil gauge. Close the
oil tank cap tightly and wipe away any spills .
English
