Oregon CS250 Manuel D'instruction page 22

OPERATING THE SAW
1 ) NOTCHING UNDERCUT
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
saw chain or the guide bar when the
second notch is being made (Fig 17)
FIG. 17
NOTCHING UNDERCUT
DIRECTION
OF FALL
NOTCH
2 ) FELLING BACK CUT
Make the felling back cut at least 50
mm (~2 in) higher than the horizontal
notching cut (Fig 18) 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. 18
FELLING BACK CUT
50 MM
DIRECTION
OF FALL
NOTCH
HINGE
22
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 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
footing
3 ) 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 Branches under
tension should be cut from the
bottom up to avoid binding the chain
saw (Fig 19)
FIG. 19
LIMB CUT
FELLING
BACK CUT
KEEP WORK OFF GROUND
LEAVE SUPPORT LIMBS UNTIL LOG IS CUT
50 MM
4 ) BUCKING A LOG
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
OREGON® CORDLESS TOOL SYSTEM
CHAIN SAW MODEL CS250
TREE LIMBING
AD 0213 - F/N 551309