Stihl MSA 160 C-BQ Product Instruction Manual - Page 14

English Warning! When sawing, make sure that the saw chain does not touch any foreign materials such as rocks, fences, nails and the like. Such objects may be flung off, damage the saw chain or cause the saw to kickback. Check the cutting attachment at regular short intervals during operation, or immediately if there is a noticeable change in cutting behavior: - Switch off the motor. - Move front hand guard to ƒ. - Remove the battery. - Check condition and tightness, look for cracks. The drive motor is not waterproof. Never work with the power tool in the rain or in wet or very damp locations. Do not leave the machine outdoors in the rain. Danger! Do not rely on the tool's insulation against electric shock. To reduce the risk of electrocution, never operate this power tool in the vicinity of any wires or cables (power, etc.) which may be carrying electric current. 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 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 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 lightning fast reaction in an uncontrolled arc mainly in the plane of the bar. Under some cutting circumstances the bar moves toward 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 12 MSA 160 C