Stihl MS 391 Safety Manual page 14

English
If the bucking cut is made from the
bottom upwards (underbuck) – risk of
pushback!
Lying logs must not touch the
ground at the point where the cut
is made – otherwise the chain will
be damaged.
Ripping
Sawing technique without use of the
spiked bumper – risk of pull-in – position
the guidebar at as shallow an angle as
possible – be especially careful –
increased risk of kickback!
Vibrations
Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands ("white finger
disease").
12
No general recommendation can be
given for the length of usage because it
depends on several factors.
The period of usage is prolonged by:
– Hand protection (wearing warm
gloves)
– Work breaks
The period of usage is shortened by:
– Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, tingling
sensation)
– Low outside temperatures
– Amount of gripping force (holding
the power tool tightly restricts
circulation)
Users who use the machine periodically
or for long periods or users who
repeatedly experience corresponding
symptoms (e.g., tingling sensation in
fingers), should undergo a medical
examination.
Maintenance and repairs
The machine must be serviced regularly.
Do not attempt any maintenance or
repair work not described in the
Instruction Manual. All other work should
be carried out by a servicing dealer.
STIHL recommends that maintenance
and repair work be carried out only by
authorized STIHL dealers. STIHL
dealers receive regular training and are
supplied with technical information.
Use only high-quality replacement parts,
in order to avoid the risk of accidents or
damage to the machine. Contact a
dealer if in doubt.
STIHL recommends the use of genuine
STIHL spare parts. Such parts have
been optimized for the machine and the
user's requirements.
Before starting any maintenance or
repair work and before cleaning the
machine, always stop the engine and
disconnect the spark plug boot – risk
of injury if the engine starts up
inadvertently! – Exception: adjustment
of carburetor and idle speed.
To reduce the risk of fire due to ignition
outside the cylinder, move the slide
control / stop switch to STOP or 0 before
turning the engine over on the starter
with the spark plug boot removed or the
spark plug unscrewed.
Do not service or store the machine near
a naked light - risk of fire due to the fuel.
Check fuel cap regularly for tightness.
Use only spark plugs that are in perfect
condition and have been approved by
STIHL – see Specifications.
Inspect ignition lead (insulation in good
condition, secure connection).
Check that the muffler is in perfect
working condition.
Do not use the machine if the muffler is
damaged or missing – risk of fire! –
Hearing damage!
Never touch a hot muffler – risk of
burns!
The condition of the antivibration
elements influences vibration behavior –
inspect antivibration elements
periodically.
Inspect chain catcher – replace if
damaged.
Chain Saw Safety Manual