Chain Brake
The chain brake
can be activated either manually or by
inertia.
Manual engagement is effected by pushing
the front
hand guard forwards with the left hand.
The mass moment of inertia of the front hand guard also
engages the chain brake
in certain situations.
If the kickback force of the
saw
is high enough, the mass
moment of inertia of the hand guard provides the
activat-
ing impulse for the chain brake.
:Warning!
The hand guard is an
integral part of the chain braking
system.
It must not be modified in any way otherwise it
will
be
deactivated.
The great advantage
of the inertia chain brake is that the
brake is
activated
after
severe
kickback
even
if the opera-
tor's left hand is not behind the front hand
guard, e.g. as it
the case when performing the felling cut.
Engaging the chain brake
When the hand guard is moved towards the nose of the
guide
bar
(either
manually
or
by inertia), the brake lever is
unlatched and the brake
band is clamped round the clutch
drum at the same instant. This
causes the saw chain to be
brought
to a standstill and locked in position.
Important: Apart from starting
and emergencies,
the
chain brake
may
be
engaged only when the
saw
is idling.
Releasing the chain
brake
The locked saw chain must be released before cutting
can
be continued. To do this,
pull the hand guard back toward
the
handlebar this disengages the brake band
from the
clutch drum.
Top:
Chain brake engaged
Bottom:
Chain brake released
Maintenance
The chain brake is subject to
normal wear. Dust, oil
or
for-
eign debris in
the chain brake mechanism may lead to in-
crease chain stopping times. It is therefore
necessary to
have it
regularly serviced and maintained!
For
specific
chain brake maintenance instructions,
see
section "Main-
tenance, Repair and Storing" of the
owner's manual.
Always carry out an
operational check by activating it once
before starting work. Make sure the
hand guard is free
from dirt
to ensure
that its smooth operation is
not
impair-
ed in any
way.
29
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