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Solo 652 Manual

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Hazards caused by kickback
ENGLISH 14 - 36 -.
9. Hazards caused by kickback
When working with the chainsaw,
careless or incorrect working methods
can cause a dangerous situation which is
referred to as "kickback". Kickback forces can occur
when the running saw chain comes into contact with
solid objects or if the saw chain suddenly gets stuck
in the cut. In the process, the chainsaw is
accelerated violently and uncontrollably.
Depending on the contact point of the running saw
chain, the forces acting on the chainsaw are directed
as follows, resulting in the corresponding
acceleration of the tool:
1. Contact point at the tip of the guide bar:
(schematic
diagram)
Danger: The guide bar is kicked up suddenly
and quickly. As the user is holding the
chainsaw by the handles, this results in a rotational
acceleration of the chainsaw, during which the guide
bar is accelerated towards the head of the operator.
Although this rotational acceleration instantly
activates the chain brake, the magnitude of the
acceleration and the uncontrolled response of the
operator can result in serious accidents.
2. Contact point in the upper part of the guide bar:
Danger: The chainsaw is kicked suddenly in the
direction of the operator. The magnitude of the
acceleration and the uncontrolled response of the
operator can result in serious accidents.
Experienced users can perform a so-called "backhand
cut". This can only be done by anticipating the sudden
acceleration of the tool and supporting the chainsaw in
a rearward direction with your thigh before positioning
the tool for the cut and while performing the cut.
Inexperienced users must not use the
"backhand cut"!
3.
Contact point in the lower part of the guide bar
(bumper spikes (26) as the point at which the
chainsaw is positioned on the cutting object):
Safe application: The chainsaw is pulled towards
the object being sawn. As the bumper spikes (26) on
the engine housing are positioned on the object being
sawn, the chainsaw cannot be accelerated away. The
operator is able to control the tool safely.
The following general guidelines should be followed
in order to avoid kickback:
• Always hold the chainsaw firmly with both hands.
Position your right hand on the rear handle
and your left handle on the front handle.
• Before positioning the saw for the cut, apply the
throttle and, with the saw chain running, start the
cut on the underside of the guide bar as close as
possible to the engine housing.
• Never cut more than one branch at a time. When
removing branches, bear in mind that other
branches may inadvertently come into contact with
the saw chain. When cutting to length, look out for
other trunks which may be close nearby.
• Special care is required when continuing cuts
which have already been started.
• Carefully watch the guide bar during the cut.
• Look out for forces which could compress the cut
gap and cause the saw chain to become trapped,
particularly on objects which are under tension.
• Always follow the correct procedure for sharpening
the saw chain. In the process, pay particular
attention to the correct height of the depth limiter.
Professional users can use special working
techniques which must only be carried out by
experienced users. We recommend that anyone who
wishes to safely learn about the more difficult
techniques which are not described here should
attend a special course (e.g. at specialist forestry
training centre).
Fig. 12
Fig. 11
Fig. 10
… 14 …


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