Stihl MS 661 C-M Installation, Operation & Maintenance Manual

MS 661 C-M
English
21
Conventional Cut
Felling notch (C) – determines the
direction of the fall
For a conventional cut:
N Properly place felling notch
perpendicular to the line of fall,
close to the ground.
N Cut down at approx. 45° angle to a
depth of about 1/5 to 1/4 of the trunk
diameter.
N Make second cut horizontal.
N Remove resulting 45° piece.
Open-face Technique
Felling notch (C) – determines the
direction of the fall
For an open-face cut:
N Properly place felling notch
perpendicular to the line of fall,
close to the ground.
N Cut down at approx. 50° angle to a
depth of approx.1/5 to 1/4 of the
trunk diameter.
N Make second cut from below at
approx. 40 degree angle.
N Remove resulting 90° piece.
Making Sapwood Cuts
N For medium sized or larger trees
make cuts at both sides of the trunk,
at same height as subsequent
felling cut.
N Cut to no more than width of guide
bar.
This is especially important in softwood
in summer – it helps prevent sapwood
splintering when the tree falls.
001BA143 KN
C
C
001BA150 KN

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g