3.2
Kickback occurs if, e. g.,
001BA257 KN
–
when the upper quadrant of the bar nose unin‐
tentionally contacts wood or another solid
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)
001BA037 KN
A
Pull-in may occur when the chain on the bottom
of the guide bar is suddenly pinched, caught or
encounters a foreign object in the wood. The
reaction of the chain pulls the saw forward –
When working on resistant wood, STIHL recom‐
mends retrofitting with a spiked bumper so that
the motor saw can be positioned safely.
3.6
Pushback (B)
001BA038 KN
B
Pushback occurs when the chain on the top of
the bar is suddenly pinched, caught or encoun‐
ters a foreign object in the wood. The reaction of
the chain drives the saw straight back toward the
operator – to avoid this risk:
–
Be alert to situations that may cause the top of
the guide bar to be pinched
–
Do not twist the guide bar in the cut
3.7
Exercise extreme caution
–
with leaners
–
with trees that have fallen unfavorably
between other trees and are under strain
–
when working in blowdown areas.
In these cases, do not use a chain saw – use a
hoist, winch or drag line instead.
Pull out exposed and cleared logs. Select clear
area for cutting.
Deadwood (dry, decayed or rotted wood) repre‐
sents a considerable risk that is difficult to
assess. Identifying the extent of the dangers is
English
3 Reactive Forces
8
0458-506-0121-C
