Reactive Forces - Stihl MS 150 TC Notice D'emploi

Reactive Forces

The most common reactive forces that
occur during cutting are: kickback,
pushback and pull-in.
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.
MS 150 TC
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.
Never cut several limbs at once.
–
Do not overreach.
–
Never cut above shoulder height.
–
Use extreme caution when re-
–
entering a previous cut.
Do not attempt plunge cuts if you
–
are not experienced in this cutting
technique.
Be alert for shifting of the log or
–
other forces that may cause the cut
to close and pinch the chain.
Always cut with a correctly
–
sharpened, properly tensioned
chain – the depth gauge setting
must not be too large.
Use a low kickback chain and a
–
narrow radius guide bar.
Pull-in (A)
Pull-in occurs when the chain on the
bottom of the bar is suddenly pinched,
caught or encounters a foreign object in
the wood. The reaction of the chain pulls
the saw forward – to reduce this risk,
always engage the spiked bumper
securely in the tree or limb.
English
A
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