Bedienungsanleitung Stihl MS271 (Seite 14 von 132) (Englisch, Spanisch)

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MS 271, MS 291, MS 291 C

English

Catalytic Converter

Your catalytic converter is furnished with

screens designed to reduce the risk of

fire from the emission of hot particles.

Due to the heat from the catalytic

reaction, these screens will normally

stay clean and need no service or

maintenance. If you experience loss of

performance and you suspect a clogged

screen, have your muffler maintained by

a STIHL servicing dealer.

Reactive Forces including Kickback

The powerful force used to cut wood can

be reversed and work against the

operator. If the rotating chain is suddenly

stopped by contact with any solid object

such as a log or branch or is pinched, the

reactive forces may occur instantly.

These reactive forces may result in loss

of control, which, in turn, may cause

serious or fatal injury. An understanding

of the causes of these reactive forces

may help you avoid the element of

surprise and loss of control. Sudden

surprise contributes to accidents.

The most common reactive forces are:

– kickback,

– pushback,

– pull-in.

Kickback:

The reaction of the cutting force of the

chain causes a rotational force on the

chain saw in the direction opposite to the

chain movement. This may fling the bar

up and back in a lightning fast reaction in

an uncontrolled arc mainly in the plane

of the bar. Under some cutting

circumstances the bar moves towards

the operator, who may suffer severe or

fatal injury.

Kickback may occur, for example, when

the chain near the upper quadrant of the

bar nose contacts the wood or is

pinched during limbing or when it is

incorrectly used to begin a plunge or

boring cut.

Warning!

Some STIHL power tools

are equipped with a cata-

lytic converter, which is

designed to reduce the

exhaust emissions of the

engine by a chemical

process in the muffler. Due to this proc-

ess, the muffler does not cool down as

rapidly as conventional mufflers when

the engine returns to idle or is shut off.

To reduce the risk of fire and burn inju-

ries, the following specific safety

precautions must be observed.

Warning!

Since a muffler with a catalytic converter

cools down less rapidly than conven-

tional mufflers, always set your power

tool down in the upright position and

never locate it where the muffler is near

dry brush, grass, wood chips or other

combustible materials while it is still hot.

Warning!

An improperly mounted or damaged

shroud or a damaged / deformed muffler

shell may interfere with the cooling proc-

ess of the catalytic converter. To reduce

the risk of fire or burn injury, do not con-

tinue work with a damaged or

improperly mounted cylinder shroud or

a damaged / deformed muffler shell.

Warning!

Reactive forces may occur any time the

chain is rotating. Reactive forces can

cause serious personal injury.

001BA093 LÄ

Kickback may occur

when the moving saw

chain near the upper

quadrant of the bar nose

contacts a solid object or

is pinched.

001BA035 KN

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Stihl MS271 Seite 14

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