Handleiding Gardena CST 3519-X-8862 (pagina 18 van 21) (Engels)

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ENGLISH - 8

Cutting action pushing the chain (from bottom to top)

(fig.3) will lead to the danger of a sudden movement of

the machine in the direction of the user, with the risk of

hitting the user, or an impact of the “kickback danger

zone” on the trunk resulting in strong kickback; extreme

care must be taken when cutting in this manner.

The safest method for using the machine, is to block the

log on a sawhorse, cutting from top to bottom, on the

portion outside the sawhorse. (fig.4)

Spiked bumper use.

Where possible, use the spiked bumper to ensure safer

cutting action: plant it in the bark or surface of the trunk in

order to maintain more control over the machine.

Below are descriptions of typical cutting procedure to be

adopted for specific situations. However, these should be

assessed each time to calculate whether the method is

most suitable or not, In order to use a method with the

least possible risk.

Trunk on the ground. (Risk of touching the ground with

the chain once the bar has passed trough the trunk).

(fig.5)

Cut from top to bottom through the whole trunk. Towards

the end of the cut, proceed very carefully to prevent the

chain from hitting the ground. If it is possible, cut 2/3 of

the trunk, roll it over, and cut the remaining third from top

to bottom to limit the risk of the chain touching the

ground.

Trunk supported at one end only (Risk of trunk

breaking during cutting action). (fig.6)

Begin the cut from underneath for about 1/3 of the

diameter, and then finish the cutting action from the top to

meet the undercut.

Trunk supported at both ends. (Risk of pinching the

chain). (fig.7)

Begin the cut from above for about 1/3 of the diameter,

and then continue from underneath to meet the overcut.

Trunk laying on a slope. Always stand on the uphill side

of the log. When ʻcutting throughʼ, to maintain complete

control, release the cutting pressure near the end of the

cut without relaxing your grip on the chainsaw handles.

Do not let the chain contact the ground.

Tree felling.

ATTENTION!: Never attempt to fell a tree if you do not

have the necessary experience, and in any case never

fell trees that have trunks with a diameter larger than the

length of the bar! This operation is reserved for expert

machine users with adequate equipment.

When felling a tree, the aim is to have the tree fall in the

most convenient position for the following limbing and

bucking operations. (Avoid trees falling on top of other

trees: Felling trees that are entangled with other trees is

a very dangerous operation).

First of all decide which is the best direction for the tree to

fall by evaluating the following: objects or other plants

around the tree, the inclination, the curve, wind direction,

and greatest branch concentration. Take into account

dead or broken branches that may break off during felling

creating a further danger risk.

ATTENTION! During tree felling operations in critical

conditions, always remove ear protection immediately

after cutting operations to be able to listen for unusual

noises and any warning signals.

Preliminary cutting operations and identifying the

retreat path.

Eliminate any branches that interfere with the job (fig.8),

starting from top to bottom, and then, always keeping the

trunk between the user and the machine eliminate the

more difficult branches afterwards, piece by piece.

Eliminate all plants that interfere with work operations and

control the area for possible obstacles (rocks, roots,

ditches,etc.) when planning the retreat path (to follow

during tree fall); Refer to the illustration (fig.9) for the

directions to be maintained (A. predicted tree fall

direction. B. Retreat path. C. Danger zone).

FELLING CUTS (fig.10)

In order to ensure that the user has complete control over

the tree fall, the cutting instructions are as follows:

The cut that controls the fall direction of the tree is to be

executed first: First of all cut the UPPER PART of the

directional notch on the side the tree must fall. Remain

on the right hand side of the tree and cut using the chain

pull method; then cut the LOWER PART that must meet

the end of the upper part. The depth of the directional

notch must be 1/4of the trunk diameter, with an angle of at

least 45° between upper and lower cut. The meeting

point between the two sides of the notch is called

“directional cut line” This line must be perfectly horizontal

at right angles (90°) to the felling direction.

The felling cut that provokes the tree fall, is performed at

3 to 5cm above the lower part of the directional felling cut

line, finishing at a distance of 1/10 of the trunk from the

notch. Remain on the left hand side of the tree and cut

using the chain pulling method and the spiked bumper.

Check that the tree does not move in a direction other

than that predicted for the fall. As soon as possible insert

a felling lever or wedge into the cut. The uncut part of the

trunk is called the “hinge”, as it is intended to guide the

tree as it falls; in cases where the cuts are not sufficient,

not straight, or have been cut through completely, the tree

fall cannot be controlled (extremely dangerous!). For this

reason the various cuts must be performed with great

precision.

When cutting operations are completed the tree will begin

to fall. Where necessary help tree fall using wedges or

felling levers.

Limbing

Once the tree has been felled, the trunk must be limbed:

in other words, the branches are removed from the trunk.

Do not underestimate this operation because the large

majority of kickback accidents occur during this stage.

For this reason pay close attention to the position of the

bar nose during cutting operations and always work on

the left hand side of the trunk.

Gardena CST 3519-X-8862 Handleiding

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