Stihl MS 150 C Instruction Manual page 17

Select the appropriate backcut
The selection of the appropriate backcut
is dependent on the same tree
characteristics that must be noted when
determining the direction of fall and the
escape paths.
There are various different features of
these characteristics. This Instruction
Manual will only describe the two most
commonly occurring variants:
Left: Normal tree – vertically
upright tree with uniform
crown
Right: Leaner tree - Crown pointing
in direction of fall
Back cut with safety strip (normal tree)
(A) Thin trunks
Implement this backcut when the trunk
diameter is smaller than the cutting
length of the machine.
MS 150 C
1.
Give a warning cry of "timber!" before
making the backcut.
Plunge cut the backcut (E) – plunge
N
the guide bar fully in
Engage the bumper spike behind
N
the hinge and use this as the
rotation point – reposition the
machine as little as possible
Make the backcut up to the
N
hinge (1)
Do not cut into the hinge
–
Make the backcut up to the safety
N
strip (2)
Do not cut into the safety strip
–
2.
Set the felling wedge (3)
N
Immediately before felling the tree, give
out a second warning cry of "timber!".
Cut through the safety strip,
N
horizontal level with the backcut,
with arms fully extended
B) Thick trunks
Implement this backcut when the trunk
diameter is greater than the cutting
length of the machine.
English
3.
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