20
OPERATING THE CHAIN SAW
OREGON® CHAIN SAW
MODEL CS1500-091
F/N 570773 - AC 0614
NOTCHING UNDERCUT
• First, make the notch / the diameter of
the tree perpendicular to the direction of
fall. Make the lower horizontal notching
undercut first (). This will help to avoid
pinching of either the saw chain or the
guide bar when the second cut () is being
made (Fig. ).
FELLING BACK CUT
• Second, make the felling back cut at least
in ( mm) higher than the horizontal
notching undercut (Fig. ). Keep the
felling back cut parallel to the horizontal
notching undercut.
• 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 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.
LIMBING A TREE
CAUTION: LIMBS UNDER TENSION
CAN “SPRING BACK” AND CONTACT
THE OPERATOR OR THROW THE CHAIN
SAW OUT OF CONTROL RESULTING IN
PERSONAL INJURY. Always be alert for
wood under tension which may strike the
operator or chain saw when cut.
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. ).
NOTCHING UNDERCUT
DIRECTION
OF FALL
NOTCH
(1)
(2)
FIG. 21
FELLING BACK CUT
FELLING
BACK CUT
HINGE
DIRECTION
OF FALL
NOTCH
2 IN
(50 MM)
2 IN
(50 MM)
FIG. 22
TREE LIMBING
LIMB CUT
KEEP WORK OFF GROUND
LEAVE SUPPORT LIMBS UNTIL LOG IS CUT
FIG. 23
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