0458-838-8601-A
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English 
5 IMPORTANT SAFETY INSTRUCTIONS
■ To reduce the risk of fire and explosion:
– Never operate the trimmer / brushcutter in a location 
where combustible gases, liquids, vapors, dusts or 
other combustible materials and substances are 
present.
– To reduce the risk of fire from sparking, never 
attempt to start the engine with the spark plug or 
boot removed.
– Read and follow recommendations issued by 
government authorities (e.g. OSHA) for identifying 
and avoiding the hazards of combustible gases, 
liquids, vapors, dusts or other combustible materials 
and substances.
– Never modify the muffler or spark arresting screen.
■ If a rotating metal blade strikes a rock or other hard object, 
sparks may be created, which can ignite flammable 
materials under certain circumstances. Flammable 
materials can include dry vegetation and brush, 
particularly when weather conditions are hot and dry.
– When there is a risk of fire or wildfire, do not use 
metal blades around flammable materials or around 
dry vegetation or brush.
– Contact your local fire authorities or the U.S. Forest 
Service if you have any question about whether 
vegetation and weather conditions are suitable for 
the use of a metal blade.
– STIHL does not recommend the use of metal blades 
when cutting in rocky areas or in areas with debris or 
other objects that could create sparks.
■ Some STIHL mowing heads have a metal core. High-
speed contact with rock or other hard objects may create 
sparks, which can ignite flammable materials under 
certain circumstances. Flammable materials include dry 
vegetation and brush, particularly when weather 
conditions are hot and dry.
– When there is a risk of fire or wildfire, do not use a 
mowing head with a metal core around dry 
vegetation or brush.
– Contact your local fire authorities or the U.S. Forest 
Service if you have any question about whether 
vegetation and weather conditions are suitable for 
the use of a mowing head with a metal core.
– STIHL does not recommend using a mowing head 
with a metal core when cutting in rocky areas or in 
areas with debris or other objects that could create 
sparks.
■ As soon as the engine is running, it generates toxic 
exhaust gases containing chemicals, such as unburned 
hydrocarbons (including benzene) and carbon monoxide, 
that are known to cause respiratory problems, cancer, 
birth defects, or other reproductive harm. Some of the 
gases (e. g. carbon monoxide) may be colorless and 
odorless. To reduce the risk of serious or fatal injury or 
illness from inhaling toxic exhaust gases:
■ Use of this trimmer / brushcutter can generate dust and 
other substances containing chemicals known to cause 
respiratory problems, cancer, birth defects and other 
reproductive harm.
– Consult governmental agencies such as EPA, 
OSHA, CARB and NIOSH and other authoritative 
sources on hazardous materials if you are unfamiliar 
– Start and operate the trimmer / 
brushcutter only outdoors in a well 
ventilated work area. Never operate the 
trimmer / brushcutter indoors, in confined 
spaces or other poorly ventilated 
locations.
– If exhaust fumes become concentrated 
due to insufficient ventilation, shut off the 
engine and clear obstructions from the 
work area. Ensure proper ventilation 
before resuming work.