Manual Hitachi CS40EA (page 12 of 80) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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In case the brake is not eﬀ ective, ask our dealer for inspection and

repairs. If the engine keeps rotating at high speed with the brake

engaged, the clutch will overheat causing trouble.

When the brake engages during operation, immediately release the

throttle lever to stop the engine.

WARNING

Do not carry the machine with the engine running.

Stopping (Fig. 17)

Decrease engine speed, and push ignition switch (15) to stop

position.

WARNING

KICKBACK DANGER (Fig. 18)

One of the most severe dangers when working with a chain saw is

the possibility of kickback. Kickback may occur when the upper tip

of the guide bar touches an object, or when the wood closes in and

pinches the saw chain in the cut. Tip contact

in some cases may

cause a lightning fast reverse reaction, kicking the guide bar up and

back toward you. Pinching the saw chain along the top of the guide

bar may also push the guide bar rapidly back towards you. Either of

these reactions may cause you to lose control

of the saw which could

result in serious personal injury. Even though your saw has safety

built into its design, you should not rely on these safety features

exclusively. Know where your bar tip is at all times. Kickback does

occur if you allow the kickback zone (19) of the bar

to touch an object.

Do not use that area. Kickback from pinching is caused by a cut

closing and pinching the upper side of the guide bar. Study your cut

and make sure it will open as you cut through. Maintain control when

the engine is running by always keeping

a ﬁ rm grip on the saw with

your right hand on the rear handle, your left hand on the front handle

and your thumbs and ﬁ ngers encircling the handles. Always hold the

saw with both hands during operation and cut at high engine speed.

WARNING

○ Do not overreach or cut above shoulder height.

○ Use extra caution when felling, and do not use the saw in a nose-

high position or above shoulder height.

CHAIN CATCHER

The chain catcher is located on the power head just below the chain

to further prevent the possibility of a

broken chain striking the chain

saw user.

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 your servicing dealer,

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 lever.

If the throttle lever 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)

20. Felling direction

21. 45° minimum

notch opening

22. Hinge

23. 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.

000Book_CS40EA_WE.indb 11000Book_CS40EA_WE.indb 11 2010/08/26 10:39:282010/08/26 10:39:28

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Hitachi CS40EA Manual

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