Bedienungsanleitung Hikoki CS33EDT (Seite 12 von 80) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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WARNING

Do not stand in-line with chain when cutting.

BASIC TECHNIQUES FOR MAKING FELLING, LIMBING AND

BUCKING CUTS

The intention of the following information is to provide you with the

general introduction to wood cutting techniques.

WARNING

○ This information does not cover all speciﬁ c situations, which may

depend on diﬀ erences in terrain, vegetation, kind of wood, form and

size of trees, etc. Consult HiKOKI Authorized Service Centers,

forestry agent or local forestry schools for advice on speciﬁ c

woodcutting problems in your area. This will make your work more

eﬃ cient and safer.

○ Avoid cutting in adverse weather conditions, such as dense fog,

heavy rain, bitter cold, high winds, etc.

Adverse weather is often tiring to work in and creates potentially

dangerous conditions such as slippery ground.

High winds may force the tree to fall in an unexpected direction

causing property damage or personal injury.

CAUTION

Never use a chain saw to pry or for any purpose for which it is not

intended.

WARNING

○ Avoid stumbling on obstacles such as stumps, roots, rocks,

branches and fallen trees. Watch out for holes and ditches. Be

extremely cautious when working on slopes or uneven ground.

Shut oﬀ the saw when moving from one work place to another.

Always cut at wide open throttle. A slow moving chain can easily

catch and force the saw to jerk.

○ Never use the saw with only one hand.

You cannot control the saw properly and you may lose control

and injure yourself severely.

Keep the saw body close to your body to improve control and

reduce strain.

When cutting with the bottom part of the chain the reactive force

will pull the saw away from you towards the wood you are cutting.

The saw will control the feeding speed and sawdust will be

directed towards you. (Fig. 19)

○ When cutting with the upper part of the chain the reactive force

will push the saw towards you and away from the wood you are

cutting. (Fig. 20)

○ There is a risk of kickback if the saw is pushed far enough so that

you begin to cut with the nose of the bar.

The safest cutting method is to cut with the bottom part of the

chain. Sawing with the upper part makes it much more diﬃ cult to

control the saw and increases the risk of kickback.

○ In case the chain locked, immediately release the throttle trigger.

If the throttle trigger keeps rotating at high speed with the chain

locked, the clutch will overheat causing trouble.

NOTE

Always keep the spiked bumper face to a tree, because the

chain may suddenly be drawn into a tree.

FELLING

Felling is more than cutting down a tree. You must also bring it down

as near to an intended place as possible without damaging the tree

or anything else.

Before felling a tree, carefully consider all conditions which may

eﬀ ect the intended direction, such as:

Angle of the tree. Shape of the crown. Snow load on the crown.

Wind conditions. Obstacles within tree range (e.g., other trees,

power lines, roads, buildings, etc.).

WARNING

○ Always observe the general conditions of the tree. Look for

decay and rot in the trunk which will make it more likely to snap

and start to fall before you expect it.

○ Look for dry branches, which may break and hit you when you

are working.

Always keep animals and people at least twice the tree length

away while felling. Clear away shrubs and branches from around

the tree.

Prepare a path of retreat away from the felling direction.

BASIC RULES FOR FELLING TREES

Normally the felling consists of two main cutting operations, notching

and making the felling cut. Start making the upper notch cut on the

side of the tree facing the feeling direction. Look through the kerf as

you saw the lower cut so you do not saw too deep into the trunk. The

notch should be deep enough to create a hinge of suﬃ cient width

and strength. The notch opening should be wide enough to direct

the fall of the tree as long as possible. Saw the felling cut from the

other side of the tree between one and two inches (3–5 cm) above

the edge of the notch. (Fig. 21)

19. Felling direction

20. 45° minimum notch opening

21. Hinge

22. Felling cut

Never saw completely through the trunk. Always leave a hinge.

The hinge guides the tree. If the trunk is completely cut through, you

lose control over the felling direction.

Insert a wedge or a felling lever in the cut well before the tree

becomes unstable and starts to move. This will prevent the guide

bar from binding in the felling cut if you have misjudged the falling

direction. Make sure no people have come into the range of the

falling tree before you push it over.

FELLING CUT, TRUNK DIAMETER MORE THAN TWICE GUIDE

BAR LENGTH

Cut a large, wide notch. Then cut a recess into the center of the

notch. Always leave a hinge on both sides of the center cut. (Fig. 22)

Complete the felling cut by sawing around the trunk as in the Fig. 23.

WARNING

These methods are extremely dangerous because they involve

the use of the nose of guide bar and can result in kickback.

Only properly trained professionals should attempt these

techniques.

LIMBING

Limbing is removing the branches from a feller tree.

WARNING

A majority of kickback accidents occur during Iimbing.

Do not use the nose of the guide bar. Be extremely cautious and

avoid contacting the log, other limbs or objects with the nose

of the guide bar. Be extremely cautious of limbs under tension.

They can spring back towards you and cause loss of control

resulting in injury. (Fig. 24)

Stand on the left side of the trunk. Maintain a secure footing and rest the

saw on the trunk. Hold the saw close to you so that you are in full control

of it. Keep well away from the chain. Move only when the trunk is between

you and the chain. Watch out for spring back of limbs under tension.

LIMBING THICK BRANCHES

When limbing thick branches, the guide bar may get pinched easily.

Branches under tension often snap up, so cut troublesome branches

in small steps. Apply the same principles as for cross cutting. Think

ahead and be aware of the possible consequences of all your actions.

CROSS CUTTING/BUCKING

Before starting to cut through the log, try to imagine what is going to

happen. Look out for stresses in the log and cut through it in such a

manner that the guide bar will not get pinched.

CROSS CUTTING LOGS, PRESSURE ON TOP

Take a ﬁ rm stance. Begin with an upper cut. Do not cut too deeply,

about 1/3 of the log diameter is enough. Finish with a bottom cut.

The saw cuts should meet. (Fig. 25)

23. Relieving cut

24. Cross cut

25. Pressure on top

26. Pressure side

27. Tension side

28. Relative depth of saw cuts

THICK LOG, LARGER THAN GUIDE BAR LENGTH

Begin by cutting on the opposite side of the log. Pull the saw towards

you, followed by previous procedure. (Fig. 26)

If the log is lying on the ground make a boring cut to avoid cutting into

the ground. Finish with a bottom cut. (Fig. 27)

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Hikoki CS33EDT Seite 12

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