Stihl MSA 300.0 Instruction Manual page 54

English
► If the wood is sound and long-fibered:
Observe the following points when making
sapwood cuts:
– The cuts must be the same on both sides.
– The cuts must be at the same height as the
bottom of the felling notch.
– The width of the cuts is 1/10 of the trunk
diameter.
The trunk does not splinter when the tree falls.
13.6.5 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
13.6.6 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
– Wind direction and speed
– Nearby trees, if any
There are different features of these conditions.
Only two features are described in this Instruc‐
tion Manual.
1
54
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.
13.6.7
A normal tree is felled with a felling cut and stabi‐
lizing strap. This felling cut must be performed if
the tree diameter is less than the guide bar's
length.
► Shout a warning.
► Plunge the guide bar into the felling cut until it
is visible at the other side of the trunk,
13.6.5.
► Apply the spiked bumper behind the hinge and
use it as a pivot.
► Enlarge felling cut in direction of hinge.
► Enlarge felling cut in direction of stabilizing
strap.
► Insert a felling wedge. The felling wedge must
match the tree diameter and the width of the
felling cut.
► Shout a warning.
► With outstretched arms, cut through the stabi‐
lizing strap horizontally from outside at the
same level as the felling cut.
The tree falls.
13.6.8
2
A normal tree is felled with a felling cut and stabi‐
lizing strap. This felling cut must be performed if
the tree diameter is greater than the guide bar's
length.
13 Operating the Saw
Felling normal, small diameter tree
Felling normal, large diameter tree
1.
2.
3.
0458-009-9801-A