Stihl MS 261 C-M Instruction Manual page 16

English
The tree is felled with the felling cut (E).
Cut horizontally
–
1/10 (at least 3 cm) of tree diameter
–
higher than bottom of felling
notch (C).
The holding strap (F) or stabilizing
strap (G) supports the tree and helps
prevent it from falling prematurely.
Width of strip: approx. 1/10 to 1/5 of
–
the trunk diameter
Do not cut into the strip during the
–
felling cut
With rotten trunks, leave a wider
–
strip
Plunge cutting
For relieving cuts during shortening
–
For wood carving
–
1.
2.
Use a low kickback saw chain and
N
proceed with special care
14
1. Begin cut by applying the lower
portion of the guide bar nose – do
not use upper portion because of
risk of kickback. Cut at full strength
until the depth of the kerf is twice the
width of the guide bar
2. Swing the machine slowly into the
plunge cutting position – risk of
kickback and pushback!
3. Make the plunge cut very carefully.
Risk of pushback.
Where possible, use a plunge blade.
The plunge blade and the upper/lower
side of the guide bar are parallel.
During plunge cutting, the plunge bar
helps to keep the hinge parallel in form,
i.e. the same thickness at all points. To
do this, guide the plunge bar parallel to
the sink chord.
Felling wedges
Insert the felling wedge as soon as
possible, i.e. as soon as no obstruction
of saw control is to be expected. Position
the felling wedge in the felling cut and
3.
drive in with suitable tools.
Only use aluminum or plastic wedges –
do not use steel wedges. Steel wedges
can seriously damage the saw chain and
cause dangerous kickback.
Select suitable felling wedges
dependent on the trunk diameter and the
width of the kerf (analogue to felling cut
(E)).
Contact the STIHL dealer for the
selection of the felling wedge (suitable
length, width and height).
Selecting the appropriate felling cut
The selection of the appropriate felling
cut 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 User 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
MS 261 C-M