Starting / Stopping The Engine - Stihl MS 151 TC Instruction Manual

15 Starting / Stopping the Engine

or by inertia in certain kickback situations: The
chain is stopped and locked.
14.2 Disengaging the Chain Brake
► Pull the hand guard towards the front handle
until there is an audible click – the chain brake
is disengaged.
NOTICE
Always disengage chain brake before accelerat‐
ing the engine (except when checking its opera‐
tion) 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).
The chain brake is also activated by the inertia of
the front hand guard if the kickback force of the
saw is high enough: The hand guard is acceler‐
ated toward the bar nose.
The chain brake will operate only if the hand
guard has not been modified in any way.
14.3 Checking Operation of the
Chain Brake
Before starting work: Run engine at idle speed,
engage the chain brake (push hand guard
towards bar nose) and open the throttle wide for
no more than 3 seconds – the chain must not
rotate. The hand guard must be free from dirt
and move freely.
14.4 Chain Brake Maintenance
The chain brake is subject to normal wear. It is
necessary to have it serviced and maintained
regularly by trained personnel. STIHL recom‐
mends that you have servicing and repair work
carried out exclusively by an authorized STIHL
servicing dealer. Maintain the following servicing
intervals:
Full-time usage:
0458-508-8321-B
every 3 months
Part-time usage:
15 Starting / Stopping the
Engine
15.1 Positions of the Master Control
lever
Stop 0 – engine off – the ignition is switched off
Normal run position (F) – engine runs or can fire.
Starting throttle n – for starting the engine
15.2 Positions of Choke Shutter
Choke shutter closed l – for starting the engine
– if the engine is cold
– if the engine stalls during opening of throttle
after starting
– If the fuel tank was run until empty (engine
stopped).
Choke shutter open j – for starting the engine
– if engine is warm (once the engine has been
running for approx. one minute)
– When Engine Begins to Fire
– after ventilation of the combustion chamber, if
the engine was flooded
15.3 Adjust Master Control lever
To move the Master Control lever from the nor‐
mal run position (F) to starting throttle (n), press
down the throttle trigger lockout and squeeze the
English
every 6 months
17