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High revs with the chain brake engaged
(chain locked) will quickly damage the
powerhead and chain drive (clutch,
chain brake).
The chain brake is designed to be
activated also by the inertia of the front
hand guard
If the forces are sufficiently high, the
hand guard is accelerated toward the
bar nose – even if your left hand is not
behind the hand guard, e.g. during a
felling cut. The chain brake will operate
correctly only if it has been properly
maintained and the hand guard has not
been modified in any way.
Check operation of STIHL Quickstop
Plus chain brake
Before starting work: Open the throttle
fully and then fully release the rear
handle. The chain must stop moving
within a second.
Check operation of STIHL Quickstop
chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push
hand guard toward bar nose). Open the
throttle wide for no more than 3 seconds.
The chain must not rotate. The hand
guard must be free from dirt and move
freely.
In case of any doubt about the above
functions, contact your STIHL dealer for
assistance.
34
Chain brake maintenance
The chain brake is subject to normal
wear and tear. It must therefore be
checked and serviced regularly by
trained personnel (e.g. a STIHL dealer)
at the following intervals:
Full-time usage:
every 3 months
Part-time usage:
every 6 months
Occasional usage:
every 12 months
Winter Operation
Pre-heating carburetor
At temperatures below +50 °F (+10 °C)
loosen screw (1) using the
N
combination wrench or a
screwdriver – open at least one turn
turn slide (2) from the s position
N
(summer operation) to the r
position (winter operation) – the
slide must engage audibly
Tighten screw
N
Now the carburetor is pre-heated by the
preheater plate – this helps prevent
carburetor icing.
MS 441 C-Q
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