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Using the chain-saw 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 that 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 likely to come into contact with climbing lines
and the operator's body (particularly the left hand and arm), and
loss of control owing to an insecure work position and resulting in contact with the saw
(unexpected movement during operation of the saw).
1. Securing the work position for two-handed use
In order to allow the saw to be held with both hands, as a general rule operators should aim
for a secure work position in which they operate the saw at
hip level, when cutting horizontal sections, and
solar plexus level, when cutting vertical sections.
Example of redirection of the main line via supplementary anchor point
Where the operator is working close into vertical stems with low lateral forces on the work
position, then a good footing could 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 redirect of the main line via a
supplementary anchor point or using an adjustable strop direct from the harness to a
supplementary anchor point.
Example of temporary foot stirrup created from endless sling
Gaining a good footing at the working position can be assisted by the use of a temporary foot
stirrup created from an endless sling.
2. Starting the saw in the tree
When starting the saw in the tree, the operator should
apply the chain brake before starting,
hold the saw on either the left or right of the body when starting,
1. on the left side, hold the saw with the left hand on the front handle and thrust the saw away
from the body while holding the pull starter cord in the right hand, or
2. on the right side, hold the saw with the right hand on either handle and thrust the saw
away from the body while holding the pull starter cord in the left hand.
The chain brake should always be engaged before lowering a running saw onto its strop.
Operators should always check that the saw has sufficient fuel before undertaking critical cuts.
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