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must be equipped with at least one
–
device designed to reduce the risk
of kickback injury such as a chain
brake, low kickback chain, reduced
kickback bar, etc.
The computer derived angles for saws
below 3.8 cubic inches (62 cm³)
displacement are measured by applying
a computer program to test results from
a kickback test machine.
Warning!
The computer derived angles of § 5.11
of ANSI B 175.1 - 2000 may bear no rela -
tionship to actual kickback bar rotation
angles that may occur in real life cutting
situations.
In addition, features designed to reduce
kickback injuries may lose some of their
effectiveness when they are no longer in
their original condition, especially if they
have been improperly maintained.
Compliance with § 5.11 of ANSI
B 175.1 - 2000 does not automatically
mean that in a real life kickback the bar
and chain will rotate at most 45°.
Warning!
In order for powerheads below 3.8 cubic
inches (62 cm³) displacement to comply
with the computed kickback angle
requirements of § 5.11 of ANSI
B 175.1 - 2000 use only the following cut -
ting attachments:
14
bar and chain combinations listed
–
as complying in the "Specifications"
section of the instruction manual or
other replacement bar and chain
–
combinations marked in
accordance with the standard for
use on the powerhead or
replacement chain designated "low
–
kickback saw chain."
See the section on "Low kickback saw
chain and reduced kickback bars."
Devices for Reducing the Risk of
Kickback Injury
STIHL recommends the use of the
STIHL Quickstop chain brake on your
powerhead with green labeled reduced
kickback bars and low kickback chains.
Warning!
To reduce the risk of injury, never use a
saw if the chain brake does not function
properly. Take the saw to your local
STIHL servicing dealer. Do not use the
saw until the problem has been rectified.
STIHL Quickstop Chain Brake
STIHL has developed a chain stopping
system designed to reduce the risk of
injury in certain kickback situations. It is
called a Quickstop chain brake.
When a kickback occurs, the guide bar
may rotate around the front handle. If the
cutting position is such that the
operator's left hand is gripping the front
handle behind the hand guard, and if the
left hand rotates around the front handle
and makes a sufficiently forceful contact
with the front hand guard, which is the
Quickstop activating lever, this contact
will activate a properly maintained
Quickstop chain brake.
All STIHL chain saws are now equipped
with a Quickstop chain brake that can be
activated by inertia. If the forces of an
occurring kickback are sufficiently high,
the hand guard is accelerated towards
the bar nose even without hand contact.
On models equipped with a STIHL
Quickstop Plus chain brake system, the
throttle trigger and the throttle trigger
lockout on the rear handle act as a third
means of activation. See the chapter
entitled "Chain Brake" of your instruction
manual.
MS 261 C-Q
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