Felling A Tree - Oregon PowerNow CS250 Guide De L'opérateur

OpERATINg ThE SAW
pruning
When pruning, make sure all bystanders
or helpers are a safe distance from
falling branches and are not directly
in front of or behind the saw operator.
Secure any branches that might pose
a hazard. Use the proper auxiliary
equipment. Maintain good footing, hold
the saw firmly with both hands, and do
not overreach.
With the saw at full speed, bring the
bottom of the guide bar into contact
with the branch to be cut. Continue
cutting using light pressure. For larger
branches, first make a shallow undercut
on the bottom of the branch and then
finish the cut from the top. Cutting a
large branch completely from the top
could cause splintering. A complete cut
from the bottom can cause the branch
to pinch the bar.

felling a tree

When bucking and felling operations
are being performed by two or more
persons, at the same time, the felling
operation should be separated from
the bucking 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
utility company should be notified
immediately.
20
ChAiNsAW MoDEl Cs 250
The chainsaw operator should keep on
the uphill side of the terrain as the tree
is likely to roll or slide downhill after it is
felled. A retreat path should be planned
and cleared as necessary before cuts are
started. The retreat path should extend
back and diagonally to the rear of the
expected line of fall (Fig. 14).
Fig. 14
RETREAT pATh OpTIONS
DIRECTION
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 where
felling cuts are to be made.
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. 15).
Fig. 15
NOTChINg UNDERCUT
DIRECTION
OF FALL
NOTCh
orEgoN® powerNow™
RETREAT
45°
RETREAT
AF 0911 - F/N 547361