To Avoid Kickback; Pull-In - Stihl MSA 120 C Manual De Instrucciones

7 Kickback and Other Reactive Forces
7.2.4

To Avoid Kickback

The best protection from personal injury that may result from
kickback is to avoid kickback situations:
1) Hold the chain saw firmly and with both hands and
maintain a secure grip, with your right hand on the rear
handle and left hand on the front handle. Maintain a
secure grip with thumbs and fingers encircling the chain
saw handles. Don't let go.
2) Make sure the area in which you are cutting is free from
obstructions.
3) Be aware of the location of the guide bar nose at all times.
Never let the nose of the guide bar unintentionally contact
any object. Do not cut limbs with the nose of the guide bar.
Be especially careful near wire fences and when cutting
small, tough limbs, small size brush and saplings which
may easily catch the saw chain.
4) Do not overreach.
5) Do not cut above shoulder height.
6) Begin cutting and continue at full speed.
7) Cut only one log at a time.
8) Use extreme caution when re-entering a previous cut.
9) Do not attempt to plunge cut if you are not experienced
with this cutting technique.
10)Be alert for shifting of the log or other forces that may
cause the cut to close and pinch the saw chain.
11)Maintain saw chain properly. Cut with a correctly
sharpened, properly tensioned saw chain at all times.
12)Stand to the side of the cutting path of the chain saw.
13)Use only replacement bars and chains specified by
STIHL, or the equivalent.
0458-716-8621-D
7.3

Pull-in

WARNING
￭ Pull-in occurs when the saw chain on the bottom of the bar
is suddenly stopped or significantly slowed when it is
pinched, caught or encounters a foreign object in the
wood. The reaction of the saw chain pulls the chain saw
forward and may cause the operator to lose control,
which, in turn, may cause serious or fatal injury. If the tip
contacts an object, kickback may occur.
￭ Pull-in usually occurs when the bumper spike of the chain
saw is not held securely against the tree or limb and when
the saw chain is not rotating at full speed before it contacts
the wood.
￭ To reduce the risk of pull-in:
– Cut with a sharp, properly tensioned chain.
– Always start a cut with the saw chain rotating at full
speed and with the bumper spike in contact with the
wood.
– Use wedges to open the kerf or cut, where possible.
– Use extreme caution when cutting small-size brush
and saplings which may easily catch the saw chain,
spring towards you or pull you off balance.
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