Chain Brake Maintenance; Winter Operation - Stihl MS 290 Manual De Instrucciones

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
only if it has been properly maintained
and the hand guard has not been
modified in any way.
Check operation of chain brake
Before starting work:
Run engine at idle speed, engage the
chain brake (push hand guard toward
bar nose). Accelerate up to full throttle
for no more than 3 seconds – the chain
must not rotate. The hand guard must be
free from dirt and move freely.
MS 290, 310, 390

Chain brake maintenance

The chain brake is subject to normal
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel, such as your STIHL servicing
dealer, at the following intervals:
Full-time professional
users: every 3
months
Semi-professional
users (in agriculture
and construction): every 6
months
Hobby and
occasional users: every 12
months
English / USA

Winter Operation

At temperatures below
+10 °C (50°F):
:
Turn the twist lock above the rear
handle counterclockwise –
slot vertical.
: Lift off the carburetor box cover to
the rear.
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