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or fatally injured and property may be dam‐

aged.

► Use the spark plugs described in this

instruction manual.

► Insert and tighten down the spark plug.

► Connect the spark plug boot and press it

down firmly.

■ The brushcutter can become damaged if it is

run with a fuel mixture that includes unsuitable

gasoline or an unsuitable two-stroke engine

oil, and also if an incorrect mix ratio of gaso‐

line and two-stroke engine oil is used.

► Mix the fuel as described in this User Man‐

ual.

■ The mixture of gasoline and two-stroke engine

oil can separate or age if it is stored for a long

period. The brushcutter can be damaged if it is

used with a fuel mix that has become separa‐

ted or has aged.

► Before refueling the brushcutter: Thor‐

oughly mix the fuel.

► Use a mixture of gasoline and two-stroke

engine oil that is not older than 30 days

(STIHL MotoMix: 5 years).

4.8

Working

WARNING

■ If the engine is not started properly, the user

may lose control of the trimmer. This may

result in serious injury to the user.

► Start the engine as described in this instruc‐

tion manual.

► If the cutting attachment is touching the

ground or objects: Do not start the engine.

■ If the start flap lever is in the position   when

the engine is started, the engine speed is

higher than the idle speed and the cutting

attachment can rotate as soon as the engine

is running. This may result in serious injury to

the user.

► Do not touch the cutting attachment.

► Start the engine as described in this instruc‐

tion manual.

■ In certain situations, the user may no longer

be able to concentrate on their work. The user

can lose control of the trimmer, stumble or fall

and be seriously injured.

► Keep calm and plan your work.

► If light and visibility are poor: Do not use

your trimmer.

► Operate the trimmer alone.

► Keep the cutting attachment close to the

ground.

► Watch out for obstacles.

► Work standing on the ground and keep your

balance.

► If you start feeling fatigue: Take a break.If

you start feeling fatigue: Take a break.

■ Exhaust gas is produced when the engine is

running. Breathing in exhaust gas can have

toxic effects.Breathing in exhaust gas can

have toxic effects.

► Avoid inhaling exhaust gas.

► Operate the trimmer is a well ventilated

location.

► In the event of nausea, headache, visual

disturbances, problems with hearing or diz‐

ziness: Stop work and seek medical advice.

■ The user’s ability to hear and assess noises is

restricted when wearing hearing protection

with the engine running.

► Keep calm and plan your work.

■ In case of working with the trimmer and the

start flap lever is in the position  , the user

cannot work with the power brush in a control‐

led manner. This may result in serious injury to

the user.

► Check that the choke lever is in position 

during operation.

► Start the engine as described in this instruc‐

tion manual.

■ The rotating cutting attachment can cut the

user. This may result in serious injury to the

user.

► Do not touch the rotating cutting attach‐

ment.

► If the cutting attachment is blocked by an

object: Shut off the engine. Before clearing

the jam.

■ If you work with mowing lines that are too

long, the brush cutter may be damaged.

► Use a suitable deflector with attached line

limiting blade.

■ The machine can be damaged if you open the

throttle while the cutting attachment is blocked

by an object.

► Shut off the engine. before clearing the jam.

■ If the behavior of the trimmer changes during

operation or feels unusual, it may no longer be

in a safe condition. This may result in serious

injury to people and damage to property.

► Stop work and consult a STIHL servicing

dealer.

■ Trimmer vibrations may occur during opera‐

tion.

► Wear gloves.

4 Safety Precautions

English

0458-844-0101-A

9

Summary of Contents for FS 491 C-M

Page 1: ...STIHL FS 491 C M Instruction Manual 2 23...

Page 2: ...themselves to a sus tainable and responsible handling of natural resources This user manual is intended to help you use your STIHL product safely and in an environmentally friendly manner over a long...

Page 3: ...er 14 Throttle trigger Controls the engine speed 15 Throttle trigger lockout Unlocks the throttle trigger 16 Stop switch Shuts off the engine 17 Wing screw The wing screw secures the handlebar to the...

Page 4: ...otects the user from contact with metal cutting attachments 3 3 Icons Meanings of symbols that may be on the trimmer and the deflector This icon denotes the fuel tank This symbol denotes the manual fu...

Page 5: ...des Do not use this deflector for circular saw blades 4 1 4 Guard for shredder blades Meanings of warning signs and labels on the deflector for shredder blades Do not sse this deflector for shredder b...

Page 6: ...ous injury to the user Tie up and confine long hair above your shoulders Objects can be thrown at high speed during operation This may result in injury to the user Wear close fitting safety glasses Su...

Page 7: ...t a STIHL dealer for assistance Close the fuel tank cap If the brushcutter is dirty Clean the brush cutter Never attempt to modify your brushcutter Exception Mounting one of the combina tions of cutti...

Page 8: ...r fatally injured and property may be damaged Protect fuel mixture and gasoline from heat and fire Do not spill fuel mixture or gasoline If fuel is spilled Wipe up fuel with a cloth and do not attempt...

Page 9: ...immer Operate the trimmer alone Keep the cutting attachment close to the ground Watch out for obstacles Work standing on the ground and keep your balance If you start feeling fatigue Take a break If y...

Page 10: ...or in the direction of the user black arrow The user can lose control of the trim mer This can result in serious or fatal injuries Hold the trimmer firmly with both hands Use the working techniques de...

Page 11: ...y to the user Wear work gloves made from resist ant material 5 Preparing Trimmer for Operation 5 1 Preparing the Brushcutter for Operation The following steps must be performed before commencing work...

Page 12: ...ar as stop and hold it depressed Rotate the mowing head until the stop pin engages in position The shaft is now blocked Unscrew the mowing head clockwise Remove the thrust plate Remove stop pin 6 4 Re...

Page 13: ...nsert the stop pin in the bore up to the limit stop and hold it depressed Rotate the metal cutting attachment clockwise until the stop pin engages in position The shaft is now blocked Unscrew the moun...

Page 14: ...Two stroke engine oil 1 l gasoline 60 ml Two stroke engine oil 3 l gasoline 100 ml Two stroke engine oil 5 l gasoline Pour two stroke engine oil into a clean approved fuel canister first and then add...

Page 15: ...again with the choke lever 2 in the position 9 2 Shut off the engine 2 3 1 0000097402_001 Release the throttle trigger 1 and throttle trig ger lockout 2 The cutting attachment comes to a standstill De...

Page 16: ...engine housing and an air filter with plastic webbing The accessories and User Manual are available from a STIHL servicing dealer 11 2 Summer Operation The shutter must be set to summer mode when wor...

Page 17: ...ceably C Release the throttle trigger The engine runs at idling speed The brushcut ter is calibrated and ready for use Shut off the engine 11 4 Holding and Controlling the Brushcutter 1 2 0000097031 0...

Page 18: ...ing attachment If a metal cutting attachment is mounted Fit the matching transport guard 13 Transporting 13 1 Transporting the Trimmer Shut off the engine If a metal cutting attachment is mounted Fit...

Page 19: ...grease can be seen on the end of the screw plug 2 Screw in the tube of STIHL gear lubri cant 1 Squeeze 5 g of STIHL gear grease into the gear housing Unscrew the tube of STIHL gear lubri cant 1 Refit...

Page 20: ...uel in the fuel tank The pickup body is not located in the right place Contact a STIHL servicing dealer 18 2 Replacing air filter The air filter cannot be cleaned The air filter must be replaced if it...

Page 21: ...A Sound power level Lw measured according to ISO 22868 112 dB A Vibration level ahv measured according to ISO 22867 Control handle 2 8 m s Left handle 3 4 m s For information on compliance with Employ...

Page 22: ...spare parts and accessories accordingly STIHL cannot warrant for the use of those parts Original STIHL spare parts and original STIHL accessories are available from STIHL dealers 22 Disposal 22 1 Disp...

Page 23: ...hi nery Safety Regulations 2008 Electromagnetic Compatibility Regulations 2016 and Noise Emis sion in the Environment by Equipment for use Outdoors Regulations 2001 and has been manu factured in compl...

Page 24: ...www stihl com 04588440101A 04588440101A 0458 844 0101 A 0458 844 0101 A...

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