Poulan 115153026 Manuel d'utilisateur télécharger pdf (Page 12)

S The wind direction and speed.

S 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.

S Weight and branches on one side.

S 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 objects. En-

gine 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 diagonal to the line of fall.

Direction of Fall

45_

Plan a clear retreat path

FELLING LARGE TREES

(6 inches (15 cm) 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 us-

ing saw to remove buttress roots, keep saw

chain from contacting ground to prevent dull-

ing of the chain.

NOTCH CUT AND FELLING THE

TREE

S 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 inches

(5 cm) above center of notch.

Hinge

S 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 (5 cm) higher than the center of

the notch. This will leave enough uncut wood

between the felling cut and the notch to form

a hinge. This hinge will help prevent the tree

from falling in the wrong direction.

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.

S 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.

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

and get away quickly on your planned re-

treat path.

S DO NOT cut down a partially fallen tree

with your saw. Be extremely cautious with

partially fallen trees that may be poorly

supported. When a tree doesn’t fall com-

pletely, set the saw aside and pull down the

tree with a cable winch, block and tackle,

or tractor.

CUTTING A FALLEN TREE

(BUCKING)

Bucking is the term used for cutting a fallen

tree to the desired log size.

WARNING: Do not stand on the log

being cut. Any portion can roll causing loss

of footing and control. Do not stand downhill

of the log being cut.

IMPORTANT POINTS

S Cut only one log at a time.

S Cut shattered wood very carefully; sharp

pieces of wood could be flung toward opera-

tor .

S Use a sawhorse to cut small logs. Never

allow another person to hold the log while

cutting and never hold the log with your leg

or foot.

S Do not cut in an area where logs, limbs,

and roots are tangled such as in a blown

down area. Drag the logs into a clear area

before cutting by pulling out exposed and

cleared logs first.

TYPES OF CUTTING USED F OR

BUCKING

WARNING: If saw becomes

pinched or hung in a log, don’t try to force it

out. You can lose control of the saw resulting

in injury and/or damage to the saw. Stop the

saw, drive a wedge of plastic or wood into the

cut until the saw can be removed easily . Re-

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Poulan 115153026 Manuel d'utilisateur Page 12

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