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Ryobi rcs3840t [8/350] English

6 | English

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

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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

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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

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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

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dangerous and should only be completed by professional

tree surgeons.

Ŷ Notching undercut

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.

Ŷ 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

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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

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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

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When the log is supported on both ends, cut 1/3 the

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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.

Ryobi rcs3840t [8/350] English

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