Alpina C25 Manual De Instrucciones página 33

8
EN
This results in an increased risk of injury due to:
• not having a firm grip on the saw if it kicks back;
• a lack of control of the saw such that it is more liable to
contact climbing lines and operators body (particularly
the left hand and arm)
• losing control from insecure work position resulting in
contact with the saw (unexpected movement during
operation of the saw).
Securing the work position for two-handed use
To allow the operator to hold the saw with both hands,
they should as general rule, aim for secure work position
where they are operating the saw at:
• hip level when cutting horizontal sections;
• solar plexus level when cutting vertical sections.
Where the operator is working close into vertical stems
with a low lateral forces on their work position, then a
good footing may be all that is needed to maintain a secure
work position.
Starting the saw in the tree
When starting the saw in the tree, the operator should:
a) apply the chain brake before starting;
b) hold saw on either the left or right of the body when
starting:
1) on the left side hold the saw with either the left hand on
the front handle or the right hand on the rear handle and
thrust the saw away from the body while holding the
pull starter cord in the other hand;
2) on the right side, hold the saw with the right hand on ei-
ther handle and thrust the saw away from the body
while holding the pull starter cord in the left hand.
However as operators move
away from the stem, they will
need to take steps to remove
or counteract the increasing la-
teral forces by, for example, a
re-direct of the main line via a
supplementary anchor point or
using an adjustable strop di-
rect from the harness to a sup-
plementary anchor point.
Gaining a good footing at the
working position can be as-
sisted by use of a temporary
foot stirrup created from an
endless sling.
The chain brake should always be engaged before low-
ering a running saw onto its strop. Operators should al-
ways check the saw has sufficient fuel before undertaking
critical cuts.
One-hand use of the chainsaw
Operators should not use tree service chainsaws one-
handed in place of unstable work positioning or in prefer-
ence to a handsaw when cutting small diameter wood at
the branch tips.
Tree service chainsaws should only be used one-handed
where:
• the operator cannot
gain a work position en-
abling twohanded use;
and
• they need to support
their working position
with one hand; and the
saw is being used at full
stretch, at right angles
to and out of line with
the operator's body.
Operators should never:
• cut with the kickback zone at the tip of the chainsaw
guide bar
• "hold and cut" sections
• attempt to catch falling sections.
Freeing a trapped saw
If the saw should become trapped during cutting, opera-
tors should:
• switch off the saw and attach it securely to the tree in-
board (i.e. towards the truck side) of the cut or to a sep-
arate tool line;
• pull the saw from the kerf whilst lifting the branch as nec-
essary;
• if necessary, use a handsaw or second chain saw to re-
lease the trapped saw by cutting a minimum of 30 cm
away from the trapped saw.
Whether a handsaw or a chainsaw is used to free a stuck
saw, the release cuts should always be outboard (toward
the tips of the branch), in order to prevent the saw being
taken with the section and further complicating the situa-
tion.
SAFETY REQUIREMENTS