Ryobi RCS3835T Traduction Des Instructions Originales page 8

motion) when cutting on the bottom edge of the bar and the
push backwards (towards the operator) when cutting along
the top edge.
SAW JAMMED IN THE CUT
Stop the product and make it safe. Do not try to force the
chain and bar out of the cut as this is likely to break the
chain which may swing back and strike the operator. This
situation normally occurs because the wood is incorrectly
supported and forcing the cut to close under compression
thereby pinching the blade. If adjusting the support does
not release the bar and chain, use wooden wedges or a
lever to open the cut and release the product. Never try
to start the product when the guide bar is already in a cut
or kerf.
INSTRUCTIONS CONCERNING THE PROPER TECH-
NIQUES FOR BASIC FELLING, LIMBING, AND CROSS-
CUTTING
Understanding the forces within the wood
When you understand the directional pressures and
stresses inside the wood you can reduce the "pinches" or at
least expect them during your cutting. Tension in the wood
this area the "kerf" or cut will tend to open as the product
goes through. If a log is being supported on a saw horse
and the end is hanging unsupported over the end then
tension is created on the upper surface due to the weight
are being pushed together. If a cut is made in this area the
kerf will have the tendency to close up during the cut. This
would pinch the blade.
Felling a tree
See page 277 - 278.
When bucking and felling operations are being performed
by two or more persons at the same time, the felling
operations 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
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.
Do not attempt to fell trees which are rotten or have been
dangerous and should only be completed by professional
tree surgeons.
Notching undercut
6 | English
See page 277 - 278.
Make the notch 1/3 the diameter of the tree,
perpendicular to the direction of falls. 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
See page 277 - 278.
Make the felling back cut at least 50 mm/2 in 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
aluminium to open the cut and drop the tree along the
desired line of fall.
When the tree begins to fall remove the product from
the cut, stop the engine, put the product down, then use
the retreat path planned. Be alert for overhead limbs
falling and watch your footing.
Removing buttress roots
See page 278.
A buttress root is a large root extending from the trunk of
the tree above the ground. Remove large buttress roots
prior to felling. Make the horizontal cut into the buttress
loose section from the work area. Follow the correct tree
felling procedure after you have removed the large buttress
roots.
Bucking a log
See page 279.
Bucking is cutting a log into lengths. It is important to
distributed on both feet. When possible, the log should be
raised and supported by the use of limbs, logs or chocks.
Follow the simple directions for easy cutting. When the log
is supported along its entire length, it is cut from the top
(overbuck).
When the log is supported on one end, cut 1/3 the diameter
When the log is supported on both ends, cut 1/3 the
When bucking on a slope always stand on the uphill side
of the log. When "cutting through", to maintain complete
control release the cutting pressure near the end of the cut
without relaxing your grip on the handles of the product.
Don't let the chain contact the ground. After completing the
cut, wait for the saw chain to stop before you move the
product. Always stop the engine before moving from tree
to tree.