Stihl MS 880 MAGNUM174 Instruction Manual - Page 16

§ 5.11 Of Ansi/opei B175.1

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English 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. Surprise contributes to accidents. The most common reactive forces are: - kickback, - pushback, - pull-in. WARNING Kickback: Kickback may occur when the moving saw chain near the upper quadrant of the bar nose contacts a solid object or is pinched. When this occurs, the energy driving the saw chain can create a force that moves the chain saw in a direction opposite to the saw chain movement at the point where the saw chain is slowed or stopped. This may fling the bar up and back in a lightning fast reaction mainly in the plane of the bar and can cause severe or fatal injury to the operator. Kickback may occur, for example, when the saw 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 chain saw. Many factors influence the occurrence and force of the kickback reaction. These include saw chain speed, the speed at which the bar and saw chain contact the object, the angle of contact, the condition of the saw chain and other factors. The type of bar and saw chain you use is an important factor in the occurrence and force of the kickback reaction. Some STIHL bar and saw chain types are designed to reduce kickback forces. STIHL recommends the use of reduced kickback bars and low kickback chains. 001BA035 KN Chain Saw Kickback Standard The following standard apply with respect to kickback: - § 5.11 of ANSI/OPEI B175.1-2012 This standard, in the following referred to as "the chain saw kickback standard" sets certain performance and design criteria related to chain saw kickback. To comply with the chain saw kickback standard: a) Chain saws with a displacement of less than 3.8 cubic inches (62 cm³) - must, in their original condition, meet a 45° computer derived kickback angle when equipped with certain cutting attachments, - and must be equipped with at least two devices to reduce the risk of kickback injury, such as a chain brake, low kickback saw chain, reduced kickback bar, etc. b) Chain saws with a displacement of 3.8 cubic inches (62 cm³) and above - must be equipped with at least one device designed to reduce the risk of kickback injury, such as a chain brake, low kickback saw chain, reduced kickback bar, etc. The computer derived angles for chain saws below 3.8 cubic inches (62 cm³) displacement are measured by applying a computer program to test results from a kickback test machine. 14 MS 880

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MS 880
English
14
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. Surprise
contributes to accidents.
The most common reactive forces are:
–
kickback,
–
pushback,
–
pull-in.
WARNING
Kickback:
When this occurs, the energy driving the
saw chain can create a force that moves
the chain saw in a direction opposite to
the saw chain movement at the point
where the saw chain is slowed or
stopped. This may fling the bar up and
back in a lightning fast reaction mainly in
the plane of the bar and can cause
severe or fatal injury to the operator.
Kickback may occur, for example, when
the saw 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 chain saw.
Many factors influence the occurrence
and force of the kickback reaction.
These include saw chain speed, the
speed at which the bar and saw chain
contact the object, the angle of contact,
the condition of the saw chain and other
factors.
The type of bar and saw chain you use
is an important factor in the occurrence
and force of the kickback reaction. Some
STIHL bar and saw chain types are
designed to reduce kickback forces.
STIHL recommends the use of reduced
kickback bars and low kickback chains.
Chain Saw Kickback Standard
The following standard apply with
respect to kickback:
–
§ 5.11 of ANSI/OPEI B175.1
-
2012
This standard, in the following referred
to as "the chain saw kickback standard"
sets certain performance and design
criteria related to chain saw kickback.
To comply with the chain saw kickback
standard:
a)
Chain saws with a displacement of
less than 3.8 cubic inches (62 cm³)
–
must, in their original condition,
meet a 45° computer derived
kickback angle when equipped with
certain cutting attachments,
–
and must be equipped with at least
two devices to reduce the risk of
kickback injury, such as a chain
brake, low kickback saw chain,
reduced kickback bar, etc.
b)
Chain saws with a displacement of
3.8 cubic inches (62 cm³) and
above
–
must be equipped with at least one
device designed to reduce the risk
of kickback injury, such as a chain
brake, low kickback saw chain,
reduced kickback bar, etc.
The computer derived angles for chain
saws below 3.8 cubic inches (62 cm³)
displacement are measured by applying
a computer program to test results from
a kickback test machine.
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