Chain Brake - Stihl MS 251 C-Q Instruction Manual

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Chain Brake

The chain brake system has two
functions:
Standard STIHL chain brake
N
STIHL coasting brake
N
The coasting brake stops chain rotation
as soon as you release the saw's rear
handle.
To reduce the risk of damage or
personal injury during cutting, observe
the characteristics that make this saw
different from saws not equipped with a
coasting brake. Before operating the
chain saw for the first time, make sure
you are familiar with how the coasting
brake works.
Coasting brake is activated
When you let go of the rear handle.
N
28
Disengaging the coasting brake
Press down the throttle trigger
N
interlock lever. This releases the
clutch drum and allows the chain to
rotate.
Chain brake is activated
When the hand guard is pushed
N
towards the bar nose by the left
hand or by inertia in certain kickback
situations.
The chain is stopped and locked.
Disengaging the chain brake
Pull the hand guard back toward the
N
front handle.
NOTICE
Always disengage chain brake before
accelerating the engine (except when
checking its operation) and before
starting cutting work.
High revs with the chain brake engaged
(chain locked) will quickly damage the
powerhead and chain drive (clutch,
chain brake).
Chain brake is activated by inertia
If the kickback force of the saw is high
enough.
The hand guard is accelerated towards
the bar nose – even if your left hand is
not behind the hand guard, e.g. during
the felling cut.
The chain brake will operate only if the
front hand guard has not been modified
in any way.
MS 251 C-Q