Stihl GS 461 Rock Boss174 Product Instruction Manual - Page 13

needed. To do this, briefly cut through abrasive material, e. g., sandstone, aerated concrete or asphalt. WARNING Do not use diamond abrasive chains for rough grinding. Large bending stresses occur during such work, which may cause diamond abrasive chains to shatter or break and result in serious or fatal injury. WARNING To reduce the risk of injury from shattered diamond abrasive chains: 1. Do not cut any material for which the diamond abrasive chain is not authorized. 2. Do not grind with the side of the diamond abrasive chain. 3. Do not twist, thrust, knock or drop the machine. This can cause damage to the diamond abrasive chain. Do not use excessive force to push the diamond abrasive chain into the work. Do not cock, jam or wedge the diamond abrasive chain in the cut. WARNING Inspect antivibration elements periodically. Replace damaged, broken or excessively worn antivibration elements immediately, since they may result in loss of control of the concrete cutter. A "sponginess" in the feel of the concrete cutter, increased vibration or increased "bottoming out" during normal operation may indicate damage, breakage or excessive wear. Antivibration elements should always be replaced in sets. If you have any questions as to whether the antivibration elements should be replaced, consult your STIHL servicing dealer. WARNING Your concrete cutter is not designed for prying or shoveling objects. Such use could damage the cutting attachment or AV system. WARNING Never modify your muffler. Any modification could cause an increase in heat radiation, sparks or sound level, thereby increasing the risk of fire, burn injury or hearing loss. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only. WARNING The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns, do not touch the muffler and other parts while they are hot. Keep the area around the muffler clean. Remove excess debris. Let the machine cool down sitting on concrete, metal, bare ground or solid wood away from any combustible substances. WARNING An improperly mounted or damaged cylinder housing or a damaged/deformed muffler shell may interfere with the cooling process of the English muffler. To reduce the risk of fire or burn injury, do not continue work with a damaged or improperly mounted cylinder housing or a damaged/deformed muffler shell. Your muffler is furnished with a spark arresting screen designed to reduce the risk of fire from the emission of hot particles. Never operate your unit with a missing or damaged spark arresting screen. If your gas/oil mix ratio is correct (i.e., not too rich), this screen will normally stay clean as a result of the heat from the muffler and need no service or maintenance. If you experience loss of performance and you suspect a clogged screen, have your muffler maintained by a STIHL servicing dealer. Some state or federal laws or regulations may require a properly maintained spark arrestor for certain uses. See the "Maintenance, Repair and Storing" section of these Safety Precautions. Reactive Forces WARNING Reactive forces may occur any time the chain is rotating. Reactive forces can cause serious personal injury. The powerful force used to cut through a workpiece can be reversed and work against the operator. If the rotating chain is suddenly stopped by contact with any solid object or by a pinch or binding, reactive forces can occur instantly and may result in the operator losing control of the concrete cutter, which, in turn, may result in serious or fatal injury. GS 461 11