Instruction Manual

MS 170, MS 170 C, MS 180, MS 180 C
English
34
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.
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:
Positions of Master Control Lever
Stop 0 – engine off – the ignition is
switched off
Normal run position (F) – engine runs or
can fire.
Starting throttle (n) – this position is
used to start a warm engine. The Master
Control lever moves to the normal run
position as soon as the throttle trigger is
squeezed.
Choke shutter closed (l) – this position
is used to start a cold engine.
Setting the Master Control Lever
To move the Master Control lever from
the normal run position (F) to choke
closed (l), press down the throttle
trigger lockout and squeeze the throttle
trigger at the same time and hold them in
that position – now set the Master
Control lever.
To select the starting throttle
position (n), move the Master Control
lever to choke closed (l) first, then
push it into the starting throttle
position (n).
The Master Control lever must be in the
choke closed position (l) for the
changeover to the starting throttle
position (n).
The Master Control lever moves from
the starting throttle position (n) to the
run position (F) when you press down
the throttle trigger lockout and blip the
throttle trigger at the same time.
To switch off the engine, move the
Master Control lever to Stop (0).
Choke shutter closed (l)
– if the engine is cold
– if the engine stalls when you open
the throttle after starting.
– if the fuel tank was run until empty
(engine stopped).
Starting throttle position (n)
– if the engine is warm, i.e. if it has
been running for about one minute.
– When the engine begins to fire
– after clearing a flooded combustion
chamber.
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
Starting / Stopping the
Engine
STOP
0
001BA140 KN