Reactive Forces - Stihl MS 382 Manual De Instrucciones

3 Reactive Forces

Change chain, guide bar and chain sprocket in
due time.
Regularly check that the clutch drum is in perfect
working condition.
Always store fuel and chain lubricant only in the
specified type of containers and ensure they are
correctly labelled. Store in a dry, cool and secure
place protected against light and sunlight.
In the event of a chain brake malfunction, switch
off the machine immediately – risk of injury! Con‐
sult a servicing dealer – do not use the machine
until the malfunction has been remedied, see
"Chain brake".
3 Reactive Forces
The most common reactive forces that occur dur‐
ing cutting are: kickback, pushback and pull-in.
3.1 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.
3.2 Kickback occurs if, e. g.,
– when the upper quadrant of the bar nose unin‐
tentionally contacts wood or another solid
0458-562-8721-B
object, e.g. when another limb is touched acci‐
dentally during limbing.
– when the chain at the nose of the guide bar is
pinched in the cut.
3.3 Quickstop chain brake:
This device reduces the risk of injury in certain
situations – it cannot prevent kickback. When
activated, the chain brake stops the saw chain
within a fraction of a second –
see the section "Saw chain" in this Instruction
Manual.
3.4 To reduce the risk of kickback
– Work cautiously and avoid situations which
could cause kickback.
– Hold the saw firmly with both hands and main‐
tain 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 previ‐
ous cut.
– Do not attempt plunge cuts if you are not
experience 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, prop‐
erly tensioned chain – the depth gauge setting
must not be too large.
– Use a low kickback chain and a narrow radius
guide bar.
3.5 Pull-in (A)
Pull-in occurs when the chain on the bottom of
the bar is suddenly pinched, caught or encoun‐
ters a foreign object in the wood. The reaction of
English
A
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