Stihl MS 880 R MAGNUM174 Instruction Manual - Page 17
WARNING, Devices for Reducing the Risk of, Kickback Injury, STIHL Quickstop Chain Brake
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WARNING The computer derived angles of the chain saw kickback standard may bear no relationship 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 the chain saw kickback standard does not automatically mean that in a real life kickback the bar and saw chain will rotate at most 45°. WARNING In order for chain saws below 3.8 cubic inches (62 cm³) displacement to comply with the computed kickback angle requirements of the chain saw kickback standard use only the following cutting attachments: - bar and saw chain combinations listed as complying in the "Specifications" section of the instruction manual or - other replacement bar and saw chain combinations marked in accordance with the standard for use on the chain saw or - replacement saw 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 green labeled reduced kickback bars and low kickback saw chains on your chain saw equipped with a Stihl Quickstop chain brake. WARNING To reduce the risk of injury, never use a chain saw if the chain brake does not function properly. Take the chain saw to your local STIHL servicing dealer. Do not use the chain saw until the problem has been rectified. STIHL Quickstop Chain Brake STIHL has developed a saw chain stopping system designed to reduce the risk of injury in certain kickback situations. It is called a Quickstop chain brake. English There are two mechanisms for activating the chain brake if it is in a properly maintained condition: - manual activation: If a kickback occurs, the chain saw moves upwards towards the user in a rotating motion around the front handle. The brake is designed to engage if the left hand contacts the front guard, which is the activation lever for the brake, and pushes it forward. - inertia activation: All STIHL chain saws are equipped with an interia 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. 001BA174 KN MS 880 15