Poulan 530086667 Manuel d'utilisateur télécharger pdf (Page 11)

Release the throttle trigger as soon as

the cut is completed, allowing the en-

gine to idle. If you run the saw at full

throttle without a cutting load, unneces-

sary wear can occur to the chain, bar,

and engine. It is recomm ended that

the engine not be operated for lon-

ger than 30 seconds at full throttle.

To avoid losing control when cut is com-

plete, do not put pressure on saw at end

of cut.

Stop the engine before setting the saw

down after cutting.

TREE FELLING TECHNIQUES

WARNING:

Check for broken or

dead branches which can fall while cutting

causing serious injury. Do not cut near build-

ings or electrical wires if you do not know the

direction of tree fall, nor cut at night since you

will not be ale to see well, nor during bad

weather such as rain, snow, or strong winds,

etc. If the tree makes contact with any utility

line, the utility company should be notified

immediately.

Carefully plan your sawing operation in ad-

vance.

Clear the work area. You need a clear area

all around the tree so you can have secure

footing.

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.

Study the natural conditions that can cause

the tree to fall in a particular direction.

Natural conditions that can cause a tree to

fall in a particular direction include:

The wind direction and speed.

The lean of the tree. The lean of a tree

might not be apparent due to uneven or

sloping terrain. Use a plumb or level to de-

termine the direction of tree lean.

Weight and branches on one side.

Surrounding trees and obstacles.

Look for decay and rot. If the trunk is rotted,

it can snap and fall toward the operator.

Check for broken or dead branches which

can fall on you while cutting.

Make sure there is enough room for the tree

to fall. Maintain a distance of

2-1/2

tree

lengths from the nearest person or other ob-

jects. Engine noise can drown out a warning

call.

Remove dirt, stones, loose bark, nails, sta-

ples, and wire from the tree where cuts are to

be made.

Plan a clear retreat path to the rear and diag-

onal to the line of fall.

Direction of Fall

Plan a clear retreat path

FELLING LARGE TREES

(6 inches in diameter or larger)

The notch method is used to fell large trees.

A notch is cut on the side of the tree in the de-

sired direction of fall. After a felling cut is

made on the opposite side of tree, the tree

will tend to fall into the notch.

NOTE:

If the tree has large buttress

roots, remove them before making the

notch. If using saw to remove buttress

roots, keep saw chain from contacting

ground to prevent dulling of the chain.

NOTCH CUT AND FELLING THE

TREE

Make notch cut by cutting the top of the

notch first. Cut through

1/3

of the diameter

of the tree. Next complete the notch by cut-

ting the bottom of the notch. See illustra-

tion. Once the notch is cut remove the

notch of wood from the tree.

Notch

First cut

Second cut

Final (felling) cut here. 2 in-

ches above center of notch.

Hinge

After removing the wood from the notch,

make the felling cut on the opposite side of

the notch. This is done by making a cut about

two inches higher than the center of the

notch. This will leave enough uncut wood

betw e e n the felling cut and the notch to form

a hinge. This hinge will help prevent the tree

from falling in the wrong di rection.

Opening

of felling

cut

Closing of

notch

Hinge holds tree on stump and helps

control fall

NOTE:

Before felling cut is complete, use

wedges to open the cut if necessary to

control the direction of fall. To avoid kickback

and chain damage, use wood or plastic

wedges, but never steel or iron wedges.

Be alert to signs that the tree is ready to

fall: cracking sounds, widening of the fell-

ing cut, or movement in the upper

branches.

As tree starts to fall, stop saw, put it down,

and get away quickly on your planned re-

treat path.

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Poulan 530086667 Manuel d'utilisateur Page 11

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