- Secure work area. ensure no persons or animals are in the
vicinity of the falling tree.Never attempt to free a jammed
saw with the motor running. Use wooden wedges to free
chain and guide bar.
When cutting and felling operations are being performed
by two or more persons, at the same time, the felling
operations should be separated from the cutting operation
by a distance of at least twice the height of the tree being
felled. Trees should not be felled in a manner that would
endanger any person, strike any utility line or cause any
property damage. If the tree does make contact with any
utility line, the company should be notiaed immediately.The
chain saw operator should keep on the uphill side of the
terrain as the tree is likely to roll or slide downhill after it is
felled.
- An escape path should be planned and cleared as
necessary before cuts are started. The escape path should
extend back and diagonally to the rear of the expected line
of fall.
- Before felling is started, consider the natural lean of the
tree, the location of larger branches and the wind direction
to judge which way the tree will fall.Remove dirt, stones,
loose bark, nails staples, and wire from the tree.
- Notching undercut: Make the notch (x-w)1/3 the diameter
of the tree, perpendicular to the direction of falls as make
the lower horizontal notching cut first. This will help to avoid
pinching either the saw chain or the guide bar when the
second notch is being made.
- Felling back cut: make the felling back cut (Y)at least 50
mm 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 wood keeps the tree from twisting and falling in
the wrong direction. Do not cut through the hinge.
- As the felling gets close to the hinge the tree should begin
to fall. If there is any chance that the tree may not fall in
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 cutting, 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.To complete the felling
1). Felling trees. (See Fig. 23)
9. GENERAL CUTTING INSTRUCTIONS.
Always wear hard hat to protect head against falling
branches. The chain saw can only be used to fell
trees smaller in diameter than the length of the guide bar.
Fig. 23
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