Echo CS-4400 Manuel d'utilisateur télécharger pdf (Page 35)

CS-4400

FELLING A TREE

A falling tree can seriously damage anything it may hit -

a car, a house, a fence, a power-line or another tree.

There are ways to make a tree fall where you want it, so

first decide where that is!

Before cutting, clear the area around the tree. You will

need good footing while working and you should be able

to work the saw without hitting any obstacles.

Next select a path of retreat.

When the tree begins to fall you should retreat away

from the direction of fall at a 45-degree angle and at

least 3 m from the trunk to avoid the trunk kicking back

over the stump. (See figure right, top)

Begin the cut on the side to which the tree is to fall.

Cut a notch approximately 1/3 of the way into the tree.

(See figure A)

The position of this notch is important since the tree will

try to fall “into” the notch. (See figure A)

The felling cut is made on the side opposite the notch.

Make the felling cut by placing spiked bumper 2.5 cm to

5 cm above the bottom of the notch and stop cutting at

approximately 1/10 of diameter to the inner edge of the

notch (See figure B) in order to leave the uncut portion

of the wood as a hinge.

Do not try to cut through to the notch with the felling cut.

The remaining wood between the notch cut and felling

cut will act as a hinge when the tree falls, guiding it in

the desired direction.

When the tree starts to fall, stop the engine, place the

saw on the ground and make your retreat quickly.

To fell big trees with a diameter exceeding twice the bar

length, start the notching cuts from one side and draw

the saw through to the other side of the notch.

Start the back cut on one side of the tree with the spiked

bumper engaged, pivoting the saw through to form the

desired hinge on that side.

Then remove the saw for the second cut.

Insert the saw in the first cut very carefully so as not to

cause kickback.

The final cut is made by drawing the saw forward in the

cut to reach the hinge. (See figure C)

Side view

Backcut

2.5 to 5 cm

Figure A

Wedges

(when room)

Top view

Leave 1/10 of diameter

Hinge

Notch cuts

FALL

90°

Figure B

Draw-across

method

Notching cuts

Wedges

Felling cuts

Top view

45°

Retreat

Fall

Retreat

1/10 of diameter

Uncut hinge wood

Notch

1/3 of diameter

Backcut

3 m

Figure C

Not this way

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Echo CS-4400 Manuel d'utilisateur Page 35

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