Stihl MSA 120 C, MSA 140 C Notice D'emploi page 81

12 Operating the Saw
F Stabilizing strap
The stabilizing strap supports the tree and helps prevent
it from falling prematurely. The width of the stabilizing
strap is 1/10 to 1/5 of the trunk diameter.
G Holding strap
The holding strap supports the tree and helps prevent it
from falling prematurely. The width of the holding strap is
1/10 to 1/5 of the trunk diameter.
12.4.5 Plunge cutting
Plunge cutting is a technique required for felling.
1
3
2
► Begin cut with the lower portion of the guide bar nose –
with chain running at full speed.
► Cut until depth of kerf is twice the width of the guide bar.
► Swing the saw into plunge-cutting position.
► Perform the plunge cut.
12.4.6 Selecting the Appropriate Felling Cut
The choice of appropriate felling cut depends on the
following conditions:
– The natural inclination of the tree
– The tree's branch formation
– Damage to the tree
– The tree's state of health
– If there is snow on the tree: the snow load
– The direction of slope
0458-716-9621-C
– Wind direction and speed
– Nearby trees, if any
There are different features of these conditions. Only two
features are described in this Instruction Manual.
1
1 Normal tree
A normal tree is vertical and has an even crown.
2 Leaner
A leaner stands at an angle and the crown faces in the
direction of fall.
12.4.7 Felling normal, small diameter tree
A normal tree is felled with a felling cut and stabilizing strap.
This felling cut must be performed if the tree diameter is less
than the guide bar's length.
► Shout a warning.
English
2
1.
2.
79