Manual Stihl MS441 C-Q (page 15 of 132) (English, Spanish)

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MS 441 C-Q

English

WARNING

Reactive Forces including Kickback

WARNING

Reactive forces may occur any time the

chain is rotating. Reactive forces can

cause serious personal injury.

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 ligtening 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.

The greater the force of the kickback

reaction, the more difficult it becomes for

the operator to control the saw. Many

factors influence the occurrence and

force of the kickback reaction. These

include chain speed, the speed at which

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 process, the

muffler does not cool

down as rapidly as con-

ventional mufflers when

the engine returns to idle

or is shut off. To reduce

the risk of fire and burn

injuries when using a cat-

alytic converter, 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 materi-

als while it is still hot.

Kickback may occur

when the moving saw

chain near the upper

quadrant of the bar nose

contacts a solid object or

is pinched.

001BA093 LÄ

001BA035 KN

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Stihl MS441 C-Q Manual

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