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4.5

Working Area and Surround‐

ings

WARNING

■ Bystanders, children and animals are not

aware of the dangers of the brushcutter or fly‐

ing debris. This may result in serious injury to

bystanders, children and animals and damage

to property.

15m (50ft)

► Do not allow bystanders,

children or animals within 15

meters of the work area.

► Maintain a clearance of 15 meters from

objects.

► Do not leave the brushcutter unattended.

► Make sure that children cannot play with

the brushcutter.

■ Hot exhaust gas is emitted through the muffler

while the engine is running. Hot exhaust gas

can ignite easily flammable materials and

cause a fire.

► Keep exhaust gas well away from easily

flammable materials.

4.6

Safe Condition

4.6.1

Brushcutter

The brushcutter is in a safe condition if the fol‐

lowing points are observed:

The brushcutter is not damaged.

There is no fuel leaking from the trimmer.

The fuel tank cap is closed.

The brushcutter is clean.

The controls function properly and have not

been modified.

A combination of cutting attachment and

deflector recommended in this user manual is

mounted.

The cutting attachment and deflector are prop‐

erly mounted.

Genuine STIHL accessories for this brushcut‐

ter are fitted.

The accessories are correctly attached.

All accessible screws and fastening parts are

firmly tightened.

WARNING

■ If not in safe condition, components may no

longer operate correctly, safety devices may

be disabled and fuel leakage may occur. This

may result in serous or fatal injury to people.

► Work only with an undamaged brushcutter.

► If fuel is leaking from the trimmer: Do not

use the trimmer and contact 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 cutting attachment and deflector

recommended in this user manual.

► If the controls do not function properly: Do

not use your brushcutter.

► Fit genuine STIHL accessories for this

brushcutter.

► Mount the cutting attachment and deflector

as described in this user manual.

► Attach accessories as described in this

User Manual or in the User Manual for the

accessories.

► Tighten loose screws and fastening parts.

► Never insert objects in the openings of the

brushcutter.

► Replace worn or damaged labels.

► If you have any doubts, be sure to consult a

STIHL dealer.

4.6.2

Deflector

The deflector is in a safe condition if the following

points are observed:

The deflector is not damaged.

The screws on the guard are tightened to the

correct torque.

If the guard is used for mowing heads: The

line limiter blade is correctly installed.

WARNING

■ If not in safe condition, components may no

longer operate correctly and safety devices

may be disabled. This may result in serious

injury to the user.

► Work only with an undamaged deflector.

► Tighten the screws on the guard to the cor‐

rect tightening torque,   6.2.

► If the guard for mowing heads is used:

Work with a properly attached cut-off blade.

► If you have any doubts, be sure to consult a

STIHL dealer.

4.6.3

Mowing Head

The mowing head is in a safe condition if the fol‐

lowing points are observed:

The mowing head is not damaged.

The mowing head is not jammed.

The mowing lines are properly installed.

The wear limits are not exceeded.

WARNING

■ If they are in an unsafe condition, parts of the

mowing head or mowing lines may come off

4 Safety Precautions

English

0458-844-0101-A

7

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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