Oregon PowerNow CS250 Guide De L'opérateur page 21

orEgoN® powerNow™
ChAiNsAW MoDEl Cs 250
2 ) FELLING BACK CUT
Make the felling back cut at least
2 inches (51 mm) higher than the
horizontal notching cut (Fig. 16).
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.
Fig. 16
FELLINg BACk CUT
2 INChES
DIRECTION
OF FALL
NOTCh
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 of fall.
When the tree begins to fall, remove
the chainsaw from the cut, stop the
motor, put the chainsaw down, then
use the retreat path planned. Be alert
for overhead limbs falling and watch
footing.
AF 0911 - F/N 547361
3 ) liMbiNg A trEE
FELLINg
BACk CUT
2 INChES
4 ) BUCKING A LOG
OpERATINg ThE SAW
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
chainsaw (Fig. 17).
Fig. 17
TREE LIMBINg
LIMB CUT
kEEp WORk OFF gROUND
LEAVE SUppORT LIMBS UNTIL LOg IS CUT
Bucking is cutting a log into
lengths. It is important to make sure
footing is firm and weight is evenly
distributed on both feet. When
possible, the log should be raised
and supported by the use of limbs,
logs or chocks.
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