Stihl MSA 160 C Manual De Instrucciones página 14

English
Warning!
When sawing, make sure that the saw
chain does not touch any foreign mate-
rials such as rocks, fences, nails and the
like. Such objects may be flung off,
damage the saw chain or cause the saw
to kickback.
Check the cutting attachment at regular
short intervals during operation, or
immediately if there is a noticeable
change in cutting behavior:
– Switch off the motor.
– Move front hand guard to ƒ.
– Remove the battery.
– Check condition and tightness, look
for cracks.
The drive motor is not
waterproof. Never work
with the power tool in the
rain or in wet or very
damp locations.
Do not leave the machine outdoors in
the rain.
Danger!
Do not rely on the tool's
insulation against electric
shock. To reduce the risk
of electrocution, never
operate this power tool in
the vicinity of any wires or
cables (power, etc.) which may be car-
rying electric current.
12
Reactive Forces Including Kickback
Warning!
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 chain is suddenly
stopped by contact with any solid object
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. Sudden
surprise contributes to accidents.
The most common reactive forces are:
– kickback,
– pushback,
– pull-in.
Kickback
Kickback may occur
when the moving saw
chain near the upper
quadrant of the bar nose
contacts a solid object or
is pinched.
The reaction of the cutting force of the
chain causes a rotational force on the
chain saw in the direction opposite to the
chain movement. This may fling the bar
up and back in a lightning fast reaction in
an uncontrolled arc mainly in the plane
of the bar. Under some cutting
circumstances the bar moves toward the
operator, who may suffer severe or fatal
injury.
Kickback may occur, for example, when
the chain near the upper quadrant of the
bar nose contacts the wood or is
pinched during limbing or when it is
incorrectly used to begin a plunge or
boring cut.
The greater the force of the kickback
reaction, the more difficult it becomes for
the operator to control the saw. Many
factors influence the occurrence and
force of the kickback reaction. These
include chain speed, the speed at which
MSA 160 C