STERWINS UP20 Instrucciones De Montaje página 206

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Kick back
Reactive forces may occur any time the chain is rotating. Reactive forces can cause serious
personal injury. The powerful force used to cut wood can be reversed and work against the
operator. If the rotating saw chain is suddenly and significantly slowed or stopped by contact
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with any solid abject such as a log or branch or is pinched, the reactive forces may occur
instantly. These reactive forces may result in loss of control, which, in turn, may cause serious
or fatal injury. An understanding of the causes of these reactive forces may help you avoid the
element of surprise and loss of control. Surprise contributes to accidents.
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Rotational kickback can happen when the upper tip of the guide bar contacts an abject while the
chain is moving. This can cause the chain to dig into the abject and momentarily stop moving. The
guide bar is then kicked up and back toward the operator in a lightning-fast reverse reaction.
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Linear kickback can happen when the wood on either side of a cut closes in and pinches the
moving saw chain a long the top of the guide bar. This can cause the chain to instantly stop. The
chain force is then reversed, causing the saw to move in the opposite direction, sending the saw
straight back toward the operator.
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Either of these reactions may cause you to lose control of the saw which could result in serious
personal injury. Do not rely exclusively upon the safety devices built into your saw. Many factors
influence the occurrence and force of the kickback reaction. These include saw chain speed, the
speed at which the bar and saw chain contact the abject, the angle of contact, the condition of
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the saw chain and other factors.
How to avoid kickback
1) Hold the chain saw firmly with both hands
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and maintain a secure grip. Don't let go of the
chain saw.
2) Be aware of the location of the guide bar
nose at all times. Never let the nose of the
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guide bar contact any abject. Do not cut limbs
with the nose of the guide bar. Be especially
careful near wire fences and when cutting
UA small, tough limbs, small size brush and
saplings which may easily catch the saw chain.
3) Don't overreach. Don't cut above shoulder
height. Do not attempt to plunge cut if you are
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not experienced with these cutting techniques.
Limbing and bucking
Limbing is removing the branches from a fallen tree. Start limbing by leaving the lower limbs
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to support the log off the ground. When under-bucking freely hanging limbs, a pinch may result
or the limb may fall, causing loss of control. If a pinch occurs, stop the engine and remove the
saw by lifting the limb. Remove the small limbs in one cut. Branches under tension should be
cut from the bottom up to avoid binding the product. Bucking is cutting a log into lengths. It is
important to make sure your footing is firm and your weight is evenly distributed on both feet.
When possible, the log should be raised and supported by the use of limbs, logs or chocks. Do
not stand on the log. Make sure the log will not roll downhill. If on a slope, stand on the uphill
side of the log. Watch out for rolling logs. Shattered wood should be cut very carefully. Sharp
slivers of wood may be caught and flung in the direction of the operator of the saw. Don't let
the chain contact the ground. Logs under strain: Risk of pinching! Always start relieving cut at
compression side. Then make bucking cut at tension side. If the saw pinches, stop the engine
and remove it from the log. Only properly trained professionals should work in an area where
the logs, limbs and roots are tangled. Drag the logs into a clear area before cutting. Pull out
exposed and cleared logs first.
4) Begin cutting and continue at full throttle.
Cut only one log at a time.
5) Use extreme caution when reentering a
previous cut.
6) Be alert for shifting of the log or other forces
that may cause the cut to close and pinch the
saw chain.
7) Maintain saw chain properly. Cut with a
correctly sharpened, properly tensioned saw
chain at all times. Only use replacement bars
and chains specified by the manufacturer.
Incorrect replacement bars and chains may
cause chain breakage and/or kickback.
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