Oleo-Mac GST 250 5029-9001E2T - Инструкция по эксплуатации - Страница 34

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Preparing to use the saw in the tree
The chainsaw should checked, fuelled, started 
and warmed up by the ground worker before it is 
sent up to the operator in the tree.
The chainsaw should be fitted with a suitable 
strop for attaching to the operator’s harness 
(Fig. 16):
a)  choke the strop around the attachment point 

on the rear of the saw (Fig. 21);

b)  provide suitable karabiners to allow indirect 

(i.e. via the strop) and direct attachment (i.e. at 
the attachment point on the saw) of saw to 
the operators harness;

c)  ensure the saw is securely attached when it is 

being sent up to the operator;

d)  ensure the saw it secured to the harness 

before it is disconnected from the means of 
ascent.

The possibility to attach the unit on the operators 
belt greatly reduces the risk of  machine damage 
during aerial work. Stop the machine when it is 
attached to the operator.
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recommended attachment points on the harness. 
These may be at mid-point (front or rear) or at the 
sides. Where possible attaching the saw to centre 
rear mid-point will keep it clear of climbing lines 
and suppor t its weight centrally down the 
operator’s spine (Fig. 17).
When moving the saw from any attachment 
point to another, operators should ensure it is 
secured in the new position before releasing it 
from the previous attachment point.

Using the chainsaw in the tree
An analysis of accidents with these saws during 
tree service operations shows the primary cause 
as being inappropriate one-handed use of the 
saw. In the vast majority of accidents, operators 
fail to adopt a secure work position which allows 
them to hold both handles of the saw. 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 ver tical 

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. 
However as operators move away from the stem, 
they will need to take steps to remove or 
counteract the increasing lateral forces by, for 
example, a re - direc t of the main line via a 
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adjustable strop direct from the harness to a 
supplementary anchor point (Fig. 18).
Gaining a good footing at the working position 
can be assisted by use of a temporary foot stirrup 
created from an endless sling (Fig. 19).

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 either handle and thrust the saw