Reactive Forces; Dangers Of Kickback; Kickback Occurs; Quickstop Chain Brake - Stihl MS 211 C Safety Manual

Do not touch the chain while the engine
is running. If the chain becomes jammed
by an obstruction, switch off the engine
immediately before attempting to
remove the obstruction.
To reduce the risk of injury, shut off the
engine before changing the saw chain.
To reduce the risk of fire, do not smoke
while operating or standing near your
power tool. Note that combustible fuel
vapor may escape from the fuel system.
If your power tool is subjected to
unusually high loads for which it was not
designed (e.g. heavy impact or a fall),
always check that it is in good condition
before continuing work – see also
"Before Starting". Check the fuel system
in particular for leaks and make sure the
safety devices are working properly. Do
not continue operating your power tool if
it is damaged. In case of doubt, have the
machine checked by your servicing
dealer.
Make sure the idle speed setting is
correct. The chain must not run when
the engine is idling with the throttle
trigger released. Check and correct the
idle speed setting at regular intervals. If
the saw chain still moves, have your
dealer check your machine and make
proper adjustments or repairs.

Reactive Forces

The most common reactive forces that
occur during cutting are: kickback,
pushback and pull-in.
Chain Saw Safety Manual

Dangers of kickback

Kickback can result in
serious or fatal injury.
Kickback occurs when the saw is
suddenly thrown up and back in an
uncontrolled arc towards the operator.
Kickback occurs, e.g.
when the upper quadrant of the bar
–
nose unintentionally contacts wood
or another solid object, e.g. when
another limb is touched accidentally
during limbing.
when the chain at the nose of the
–
guide bar is pinched in the cut.

Quickstop chain brake:

This device reduces the risk of injury in
certain situations – it cannot prevent
kickback. If activated, the brake stops
the saw chain within a fraction of a
second – for a description of this device
refer to chapter on "Chain Brake" in this
manual.
To reduce the risk of kickback
Work cautiously and avoid
–
situations which could cause
kickback.
Hold the saw firmly with both hands
–
and maintain a secure grip.
Always cut at full throttle.
–
Be aware of the location of the guide
–
bar nose at all times.
Do not cut with the bar nose.
–
Take special care with small, tough
–
limbs, they may catch the chain.
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