due to kickback: Saw chain is blocked - and
stops running.
16.2 Disengage the chain brake.
► Pull the hand guard back towards the front
handle.
NOTICE
The chain brake must be released before open‐
ing the throttle (except during functional check‐
out) and before sawing.
Running the engine at high revs with the chain
brake engaged (chain locked) will quickly dam‐
age the engine and chain drive (clutch, chain
brake).
The chain brake is also activated by the inertia of
the front hand guard if the kickback force of the
saw is high enough: The hand guard is acceler‐
ated toward the bar nose – even if your left hand
is not behind the hand guard, e.g. during felling
cut.
The chain brake will operate only if the hand
guard has not been modified in any way.
16.3 Checking Operation of the
Chain Brake
Before starting work: Run engine at idle speed,
engage the chain brake (push hand guard
towards bar nose) and open the throttle wide for
(no more than 3 seconds) – the chain must not
rotate. The hand guard must be free of dirt and
easily moveable.
16.4 Chain Brake Maintenance
The chain brake is subject to (normal wear). It is
necessary to have it serviced and maintained
regularly by trained personnel. STIHL recom‐
mends that maintenance and repair work be car‐
ried out only by authorised STIHL dealers. The
following intervals must be complied with:
Full-time use: quarterly
Part-time use: every six months
occasional use: annually
17 Winter Operation
17.1 Pre-heat carburetor
► Remove the shroud – see "Shroud"
17.1.1 At temperatures below +10 °C
► Using the combination wrench or a screw‐
driver, pry the shutter out of the s (summer
operation) position
► Place the shutter with the opening in the direc‐
tion of the chain saw (winter operation) –
arrow points toward symbol r – shutter must
audibly snap into place
In the winter operation position, the tip of the
arrow (1) is visible.
► Fit the shroud – see "Shroud"
Heated air is now drawn in from around the cylin‐
der and circulates around the carburetor – this
helps prevent carburetor icing.
17.1.2 At temperatures above +20 °C
► Ensure that the shutter is set back to position
s (summer operation) without fail, otherwise
the engine may malfunction due to overheat‐
ing
English 17 Winter Operation
24 0458-574-0121-D
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