Stihl MS 881 User Manual

11.9.4 Cutting the felling notch
The felling notch determines the direction in
which the tree falls. Country-specific standards
for making the felling notch must be observed.
0000-GXX-1249-A0
► Position the saw so that the felling notch is an
right angles to the direction of fall and the saw
is close to the ground.
► Make the horizontal cut.
► Make the angle cut at 45° to the horizontal cut.
0000-GXX-1250-A1
► If the wood is sound and long-fibered:
Observe the following points when making
sapwood cuts:
–
The cuts must be the same at both sides.
–
The cuts must be at same height as bottom
of felling notch.
–
The width of the cuts is 1/10 of the trunk
diameter.
The trunk does not splinter when the tree falls.
11.9.5 Plunge cutting
Plunge cutting is a technique required for felling.
3.
1.
2.
0000-GXX-1252-A0
► 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
11.9.6 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.
0000-GXX-1253-A0
1
2
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.
11.9.7 Felling normal, small diameter tree
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.
0000-GXX-1254-A0
1.
2.
11 Operating the Saw English
0458-890-8321-B. VA0.A21. 21

Stihl MS 881 Specifications

General

Idle speed	2800 RPM
Motor type	2-stroke motor
Chain pitch	1/2.47 \
Blade length	900 mm
Product color	Black, Grey, Orange
Motor speed (max)	8500 RPM
Oil tank capacity	0.7 L
Fuel tank capacity	1.3 L
Engine displacement	121.6 cm³
Kickback protection	Yes
Engine power	8.7 hp
Power source	Gasoline
Sound power level	118 dB
Vibration emission	8.9 m/s²
Sound pressure level	106 dB

Weight and Dimensions

Weight	9800 g