Notching Undercut; Felling Back Cut; Limbing A Tree - Oregon CS1500-091 Manuel D'instructions Original

OPERATING THE CHAIN SAW

NOTCHING UNDERCUT

• First, make the notch 1/3 the diameter of
the tree perpendicular to the direction of
fall Make the lower horizontal notching
undercut first (1) This will help to avoid
pinching of either the saw chain or the
guide bar when the second cut (2) is being
made (Fig 21)
FIG. 21
NOTCHING UNDERCUT
DIRECTION
OF FALL
(2)
NOTCH
(1)

FELLING BACK CUT

• Second, make the felling back cut at least
2 in (50 mm) higher than the horizontal
notching undercut (Fig 22) Keep the
felling back cut parallel to the horizontal
notching undercut
FIG. 22
FELLING BACK CUT
2 IN
(50 MM)
DIRECTION
OF FALL
NOTCH
HINGE
• 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
20
• 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
FELLING
• Branches under tension should be cut
BACK CUT
from the bottom up to avoid binding the
chain saw (Fig 23)
2 IN
(50 MM)
FIG. 23
LIMB CUT
KEEP WORK OFF GROUND
LEAVE SUPPORT LIMBS UNTIL LOG IS CUT
OREGON® CHAIN SAW
MODEL CS1500-091
TREE LIMBING
F/N 570773 - AC 0614