Operation Manual

MS 461 R
English
36
felling cut. The chain brake will operate
only if it has been properly maintained
and the hand guard has not been
modified in any way.
Check operation of chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push
hand guard toward bar nose).
Accelerate up to full throttle for no more
than 3 seconds – the chain must not
rotate. The hand guard must be free
from dirt and move freely.
Chain brake maintenance
The chain brake is subject to normal
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel, such as your STIHL servicing
dealer, at the following intervals:
Pre-heating the carburetor at
temperatures below +50 °F (+10 °C)
N Remove the carburetor box cover
N in the carburetor box cover, move
the slide (1) from summer position
to winter position (2)
Heated air is now drawn in from around
the cylinder and mixed with cold air – this
helps prevent carburetor icing.
N At temperatures above +68 °F
(+20 °C): always return the slide to
the summer position –
NOTICE
otherwise risk of engine malfunction due
to overheating!
Air filter system
N Retrofit new air filter if necessary –
see "Air filter system"
At temperatures under +14 °F (-10 °C)
Under extreme winter conditions
(temperatures below 14 °F (--10 °C),
powdered or drifting snow), it is
recommended to mount the cover plate
(special accessory) on the fan housing.
The partial covering of the slits in the fan
housing keeps out powdered or drifting
snow.
In case of erratic idling behavior or poor
acceleration
N Turn the low speed screw (L)
1/4 turn counterclockwise
Whenever the low speed screw (L) has
been adjusted, it is usually also
necessary to adjust the idle speed
screw (LA), see "Setting the carburetor".
When the cover plate is mounted, the
slide must be in winter position in the
carburetor box cover.
N if the chain saw is extremely cold
(frost formation) – after starting,
bring the engine up to operating
temperature at increased idle speed
(disengage chain brake!)
N if engine trouble occurs, first check
whether use of intake air pre-
heating is necessary
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
Winter Operation
1
2
145BA040 KN
3443BA004 KN