HUSQVARNA 257 Instruction Manual

SAFETY INSTRUCTIONS
6 The way the chain brake is triggered, either manually or
automatically, depends on the force of the kickback and the2 Throttle lock
position of the chain saw in relation to the object that theThe throttle lock is designed
to prevent accidental opera-
kickback zone of the bar strikes.tion of the throttle control.
When you press the lock (A)
(i.e. when you grasp the
If you get a violenthandle) it releases the throttleA
kickback while thetrigger (B).
kickback zone of the barWhen you release the handle
is farthest away from youthe throttle trigger and the
the chain brake will bethrottle lock both move back
activated by theto their original positions. This
movement of the
counterweight (INERTIAmovement is controlled by two
ACTIVATED).independent return springs.B
This arrangement means that
the throttle control is
automatically locked at the
idle setting when you release
the handle.
3 Chain catcher
If the kickback is lessThe chain catcher is designed
violent or the kickbackto catch the chain if it snaps or
zone of the bar is closerjumps off. This should not
to you the chain brake willhappen if the chain is properly
be activated manually bytensioned (see section on
the movement of your left�Assembly�) and if the bar and
hand.chain are properly serviced
and maintained.
(See section on �General
working instructions�).
4 Right hand guard
Apart from protecting your
7 During felling your lefthand if the chain jumps or
hand grasps the frontsnaps, the right hand guard
handle in such a way thatstops branches and twigs
it cannot activate the frontfrom interfering with your grip
hand guard. In thison the rear handle.
position the chain brake
can only be activated by
the inertia action of the
counterweight.
The inertia activated
chain brake increases
your safety but there are
certain factors to
remember (see point 6
above).
6 � English