Stihl MS 391 Safety Manual page 11

Sapwood cuts
With long-fibered wood, sapwood cuts
prevent the sapwood from splintering
when felling the trunk – saw both sides
of the trunk at the level of the felling
notch base to approx. 1/10 of the
diameter of the trunk – with thicker
trunks, not more than the width of the
guide bar.
Do not use sapwood cuts on diseased
trees.
Chain Saw Safety Manual
Felling cut
D
Give a warning cry of "timber!" before
making the felling cut.
N Make the felling cut (D) slightly
higher than the horizontal cut of the
felling notch
– Exactly horizontal
– approx. 1/10 of the diameter of the
trunk must remain standing
between the felling cut and the
notch = bridge
Insert wedges in the felling cut in time –
use only wedges made of wood, light
metal or plastic - no steel wedges. Steel
wedges damage the saw chain and can
cause kickback.
E
D
E
The bridge (E) functions as a hinge to
guide the tree to the ground.
– Never saw through the bridge while
felling – otherwise the tree with fall
in a direction other than the one
planned – risk of accident!
– With rotten trunks, leave a wider
bridge
Immediately before felling the tree, give
out a second warning cry of "timber!".
English
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