Stihl MSA 300.0 Notice D'emploi page 12

English
6.2.2 Chain Saw Kickback Standards
The following standards apply with respect to
kickback:
– CSA Z62.1
– CSA Z62.3
These standards, referred to as "the chain saw
kickback standards" in this chapter, set certain
performance and design criteria related to chain
saw kickback.
To comply with the chain saw kickback stand‐
ards, electric chain saws:
– must, in their original condition, meet a 45°
computer-derived kickback angle when equip‐
ped 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 chain, reduced kick‐
back bar, etc.
The computer-derived angles for electric chain
saws are measured by applying a computer pro‐
gram to test results from a kickback test
machine.
WARNING
■ Compliance with the chain saw kickback
standards does not mean that the bar and saw
chain will rotate at most 45° in a real life kick‐
back.
■ The computer-derived angles of the chain saw
standards may bear no relationship to actual
kickback bar rotation angles that may occur in
a real life cutting situation.
■ Devices designed to reduce the risk of kick‐
back injuries may lose some of their effective‐
ness when they are no longer in their original
condition, especially if they have been improp‐
erly maintained.
► Read and follow the safety precautions and
instructions in this manual.
► When working, always position the chain
saw such that your body is clear of the cut‐
ting attachment and outside of the cutting
plane.
► Follow the maintenance and service
instructions in this manual.
■ For the chain saw to meet the chain saw kick‐
back standards, use only the following cutting
attachments:
► Compliant bar and chain combinations lis‐
ted in Combinations of Guide Bars and Saw
Chains, 27.1;
► Other replacement bar and saw chain com‐
binations marked in accordance with the
standards for use on the chain saw.
12
6 Kickback and Other Reactive Forces
6.2.3 Devices for Reducing the Risk of Kick‐
back Injury
The STIHL Quickstop chain brake and STIHL's
green-labeled, reduced kickback bars and green-
labeled, low kickback chains are designed to
reduce the risk of kickback injury.
1. STIHL Quickstop Chain Brake
There are two mechanisms for activating the
chain brake if it is in a properly maintained condi‐
tion:
– Manual Activation: If a kickback occurs, the
chain saw moves upwards toward the user in
a rotating motion around the front handle. The
brake is designed to engage if the left hand
contacts the front hand guard, which is the
activation lever for the brake, and pushes it
forward.
– Inertia Activation: All STIHL chain saws are
equipped with an inertia Quickstop chain
brake. If the kickback impulse is strong
enough, this alone is sufficient to engage the
brake even without contacting the front hand
guard.
WARNING
■ To reduce the risk of kickback injury:
► Never use a saw if the chain brake does not
function properly.
► When in doubt, take the saw to an author‐
ized STIHL servicing dealer for inspection
and/or repair.
► Do not use the saw until the problem has
been corrected.
■ In a kickback situation, the front hand guard
helps protect your left hand from contacting
the chain. Removal of the front hand guard on
a chain saw equipped with a Quickstop chain
brake will reduce this protection and also disa‐
ble the chain brake, increasing the risk of kick‐
back injury.
► Never operate your saw without a properly
functioning front hand guard. If the front
hand guard is missing, manual activation
and inertia activation of the chain brake will
be completely disabled.
0458-009-8202-B