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9.2 Description of the correct procedures for basic use of the chainsaw
Felling a tree (Figs. 13-16)
If two or more persons are working at the same time on felling and cutting back then the
minimum distance between the tree being felled and the tree being cut back should be at
least twice the height of the tree being felled (Fig. 13). When felling trees, care must be taken
to ensure that no other persons are endangered, no power supply lines are hit and no
material damage is caused to equipment or property. In the event that a tree comes into
contact with a power supply line, he responsible power supply company should be informed
immediately.
When working with the saw on a slope, the operator of the chainsaw must be standing at a
higher point on the slope than the tree being felled, as the tree will roll or slip downhill once it
has been felled (Fig. 14). Before felling the tree you must first plan and if necessary clear an
escape route. This escape route must lead away diagonally in the opposite direction to the
expected fall direction – this can be seen in Fig.15 (A= danger zone, B= direction of fall, C=
escape zone).
Before felling the tree you must take into account the natural inclination of the tree, the
location of larger branches and the wind direction, as this will help you to correctly determine
the direction in which the tree will fall.
Dirt, stones, loose bark, nails, staples and wire must be removed from the tree.
Fig.13
Fig.14
Fig.15
Making the felling notch (Fig. 16)
Cut a notch (A) at right angles to the fall direction to a depth of 1/3 of the tree diameter as
shown in Fig. 16. First make the lower horizontal felling notch (A). This prevents the saw
chain or the guide rail from becoming trapped when the second felling notch is made.
Making the felling cut (Fig.17)
The felling cut should be positioned at least 50 mm above the horizontal felling notch. Make
the felling cut (B) parallel to the horizontal felling notch. The felling cut should be cut to a
depth which leaves a thin strip (felling hinge strip) (D) which can act as a hinge. This strip
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