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Hitachi CS33EB Handleiding

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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. 14)
Decrease engine speed, and push ignition switch (15) to stop
position.
WARNING
KICKBACK DANGER (Fig. 15)
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 ma
y
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 sa
w 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 (20) of the bar to t
ouch 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 sa
w 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 str
iking 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 mak
e 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 fa
ll 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 mo
ving 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 bo
ttom 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. 16)
○ When cutting with the upper part of the chain the reac
tive force
will push the saw towards you and away from the wood you are
cutting. (Fig. 17)
○ 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 bo
ttom 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
lock
ed, 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 an
ything 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 tw
ice 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 no
tch 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 no
tch 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. 18)
21. Felling direction
22. 45° minimum no
tch opening
23. Hinge
24. 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 st
arts 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. 19)
Complete the felling cut by sawing around the trunk as in the
Fig. 20.
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_CS33EB_WE.indb 12000Book_CS33EB_WE.indb 12 2010/11/30 11:09:312010/11/30 11:09:31
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