Chainsaw Safety Manual

Chain Saw Safety Manual

WARNING Read Instruction Manual thoroughly before use and follow all safety precautions – improper use can cause serious or fatal injury.

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a chain saw for logging purposes, for Safety Precautions instance, refer to the OSHA regulations WARNING for "logging operations" at 29 Code of Always stop the engine and activate the Federal Regulations 1910.266. Because a chain saw is a QuickStop Chainbrake before high-speed, fast-cutting transporting or carrying out any work on power tool, special safety WARNING the chain saw. This avoids the risk of the engine starting unintentionally. precautions must be Do not lend or rent your chain saw observed to reduce the without the instruction manual. Be sure STIHL recommends the use of genuine risk of personal injury. that anyone using it understands the STIHL replacement parts. They are It is important that you information contained in this manual. specifically designed to match your model and meet your performance read, fully understand The use of noise emitting chain saws requirements. and observe the following may be restricted to certain times by safety precautions and national, state or local regulations. Safe use of a chain saw involves warnings. Read the instruction manual and Use your chain saw only for cutting 1 the operator wooden objects. the safety instructions 2 the chain saw periodically. Careless or improper use may cause WARNING 3 the use of the chain saw. serious or fatal injury. Do not use it for other purposes, since Save the instruction man- THE OPERATOR misuse may result in personal injury or ual for future reference. property damage, including damage to the chain saw. Physical Condition WARNING You must be in good physical condition The use of this chain saw may be WARNING and mental health and not under the hazardous. The saw chain has many influence of any substance (drugs, Minors should never be allowed to use sharp cutters. If the cutters contact your alcohol, etc.) which might impair vision, this chain saw. Bystanders, especially flesh, they will cut you, even if the chain dexterity or judgment. Do not operate children, and animals should not be is not moving. this chain saw when you are fatigued. allowed in the area where it is in use. Most of these safety precautions and WARNING WARNING warnings apply to the use of all STIHL Reactive forces, including kickback, can chain saws. Different models may have Be alert – if you get tired, take a break. be dangerous. Pay special attention to different parts and controls. See the Tiredness may result in loss of control. the section on reactive forces. appropriate section of your instruction Working with any power tool can be strenuous. If you have any condition that Have your STIHL dealer show you how manual for a description of the controls might be aggravated by strenuous work, to operate your chain saw. All safety and the function of the parts of your check with your doctor before operating precautions that are generally observed model. this chain saw. when working with an axe or a hand saw also apply to the operation of chain saws. Observe all applicable federal, state and local safety regulations, standards and ordinances. When using

2 Chain Saw Safety Manual English

– Keep the AV system well Clothing must be sturdy WARNING maintained. A chain saw with loose and snug-fitting, but allow Prolonged use of a chain saw (or other components or with damaged or complete freedom of power tools) exposing the operator to worn AV elements will tend to have movement.To reduce the vibrations may produce whitefinger higher vibration levels. risk of cut injuries, wear disease (Raynaud's phenomenon) or – Keep the saw chain sharp and well the type of overalls, long - carpal tunnel syndrome. maintained. A dull saw chain will pants or chaps that con increase cutting time, and pressing tain pads of cut-retardant These conditions reduce the hand's - a dull saw chain through wood will material. Avoid loose-fit ability to feel and regulate temperature, ting jackets, scarfs, produce numbness and burning increase the vibrations transmitted to your hands. neckties, jewelry, flared sensations and may cause nerve and or cuffed pants, uncon- circulation damage and tissue necrosis. – Maintain a firm grip at all times, but fined long hair or All factors which contribute to white- do not squeeze the handles with anything that could finger disease are not known, but cold constant, excessive pressure. Take become caught on weather, smoking and diseases or frequent breaks. branches, brush or the physical conditions that affect blood All the above-mentioned precautions do moving parts of the chain vessels and blood transport, as well as not guarantee that you will not sustain saw. Secure hair so it is high vibration levels and long periods of whitefinger disease or carpal tunnel above shoulder level.. exposure to vibration are mentioned as syndrome. Therefore, continual and Good footing is very factors in the development of whitefinger regular users should closely monitor the important. Wear sturdy disease. In order to reduce the risk of condition of their hands and fingers. If boots with nonslip soles. whitefinger disease and carpal tunnel any of the above symptoms appear, Steel-toed safety boots syndrome, please note the following: seek medical advice immediately. are recommended. Never – Most STIHL chain saws are wear sandals, flip-flops or available with an anti-vibration WARNING go barefoot. ("AV") system designed to reduce The ignition system of the STIHL unit Always wear heavy-duty the transmission of vibrations produces an electromagnetic field of a work gloves (e.g. made of created by the chain saw to the very low intensity. This field may leather or wear resistant operator's hands. An AV system is interfere with some pacemakers. To material) when handling recommended for those persons reduce the risk of serious or fatal injury, the chain saw and the using chain saws on a regular or persons with a pacemaker should cutting tool. Heavy-duty, sustained basis. consult their physician and the nonslip gloves improve – Wear gloves and keep your hands pacemaker manufacturer before your grip and help to pro- warm. Heated handles, which are operating this chain saw. tect your hands. available on some STIHL chain Proper Clothing saws, are recommended for cold weather use. WARNING To reduce the risk of injury, the operator should wear proper protective apparel.

Chain Saw Safety Manual 3 English

To reduce the risk of Accidental acceleration of the engine injury to your eyes never WARNING can cause the saw chain to rotate. operate your power tool Never modify this chain saw in any way. Always engage the chain brake when unless wearing goggles Only attachments supplied by STIHL or taking more than a few steps. or properly fitted protec- expressly approved by STIHL for use tive glasses with with the specific STIHL model are adequate top and side authorized. Although certain protection complying with unauthorized attachments are useable ANSI Z87 "+" (or your with STIHL chain saws, their use may, in applicable national stand- fact, be extremely dangerous. ard). If there is a risk of injury to your face, STIHL recommends that you WARNING

also wear a face shield or Never operate your chain saw if it is 001BA275 KN face screen over your damaged, improperly adjusted or By hand: When transporting your chain goggles or protective maintained, or not completely and saw by hand, the engine must be shut glasses. securely assembled. off and the chain saw must be in the Wear an approved safety If this chain saw is subjected to proper position, i.e., grip the top handle hard hat to reduce the unusually high loads for which it was not and place the muffler away from the risk of injury to your head. designed (e.g. heavy impact or a fall), body; the chain guard (scabbard) should Chain saw noise may always check that it is in good condition be over the saw chain and guide bar, damage your hearing. before continuing work. Check in which should point backwards, away Wear sound barriers (ear particular that the fuel system is tight (no from the direction in which you are plugs or ear mufflers) to leaks) and that the controls and safety walking. help protect your hearing. devices are working properly. Do not By vehicle: When transporting in a Continual and regular continue operating this chain saw if it is vehicle, keep saw chain and bar covered users should have their damaged. In case of doubt, have it with the chain guard (scabbard). hearing checked checked by your STIHL servicing dealer. Properly secure your chain saw to regularly. prevent turnover, fuel spillage and Be particularly alert and cautious when THE USE OF THE CHAIN SAW damage to the chain saw. wearing hearing protection because Fuel your ability to hear warnings (shouts, Transporting the Chain Saw alarms, etc.) is restricted. Your STIHL chain saw uses an oil- gasoline mixture for fuel (see the "Fuel" WARNING THE CHAIN SAW chapter in this instruction manual). Always stop the engine before putting the chain saw down. Carrying a chain For illustrations and definitions of the saw with the engine running may be chain saw parts see the chapter on extremely dangerous. "Main Parts."

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Allow the Saw to Cool Before Removing without allowing the saw to cool WARNING the Fuel Cap adequately. It is more likely to occur when the fuel tank is half full or more. Gasoline is an extremely flammable fuel. If spilled WARNING Pressure is caused by fuel and heat and and ignited by a spark or Gasoline vapor pressure may build up can occur even if the engine has not other ignition source, it inside the fuel tank. The amount of been running. When gasoline in the fuel - can cause fire and seri pressure depends on a number of tank is heated (by ambient ous burn injury or factors such as the fuel used, altitude temperatures, heat from the engine, or property damage. Use and temperature. To reduce the risk of other sources), vapor pressure will extreme caution when burns and other personal injury from increase inside the fuel tank. handling gasoline or fuel escaping gas, vapor and fumes, always Some blends of gasoline, particularly mix. Do not smoke or shut off the engine and allow it to cool those designed for use in winter, are bring any fire or flame before removing the fuel cap. more volatile and may cause tanks to near the fuel or the chain pressurize more quickly or create saw. Note that combus- The engine is air cooled. When it is shut greater pressure. At higher altitudes, tible fuel vapor may off, cooling air is no longer drawn across fuel tank pressurization is more likely. escape from the fuel the cylinder and engine temperatures system. will rise for several minutes before How to Avoid Fuel Spraying starting to cool. In hot environments, Fueling Instructions cooling will take longer. To reduce the Removing the fuel cap on a pressurized risk of burns and other personal injury tank can result in gasoline, vapors and WARNING from escaping gas, vapor and fumes, fumes being forcefully sprayed out from allow the saw to cool. If you need to the fuel tank in all directions. To reduce refuel before completing a job, turn off the risk of burns, serious injuries or the machine and allow the engine to cool property damage from fuel spraying: before opening the fuel tank. – Follow the fueling instructions in this Fuel Spraying or “Geysering” chapter. – Always assume your fuel tank is Pick a Safe Location WARNING pressurized. To reduce the risk of fire and explosion, Removing the cap on a pressurized fuel – Allow the chain saw to cool before fuel your chain saw in a well-ventillated tank can result in gasoline, vapors and removing the fuel cap. area, outdoors away from flames, pilot fumes being forcefully sprayed out from lights, heaters, electric motors, and – In hot environments, cooling will the fuel tank in all directions. The other sources of ignition. Vapors can be take longer. escaping gasoline, vapors or fumes can ignited by a spark or flame many feet cause serious personal injury, including – The engine is air cooled. When it is away. Select bare ground for fueling fire and burn injury, or property damage. shut off, cooling air is no longer and move at least 10 feet (3 m) from the drawn across the cylinder and the fueling spot before starting the engine. Sometimes also referred to as "fuel engine temperature will rise for Wipe off any spilled fuel before starting geysering," fuel spraying is an expulsion several minues before starting to your chain saw. Take care not to get fuel of fuel, vapors and fumes which can cool. on your clothing. If this happens, occur in hot conditions, or when the change your clothing immediately. engine is hot, and the tank is opened

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After the saw has cooled appropriately, – If any significant venting occurs, Installing the Toolless Fuel Cap follow the safety instructions in this immediately re-seal the tank by chapter for removing the cap. Never turning the cap clockwise to the WARNING remove the cap by turning it directly to closed position. Allow the saw to the open position. First check for cool further before attempting to residual pressure by turning the cap open the tank. 1 4 slowly to the vent position, 1 – Turn the cap to the open position (3) approximately 1/8 turn counter- only after the contents of the tank clockwise. Use only good quality fuel are no longer under pressure. In the that is appropriate for the season open position, the exterior (summer v. winter blends). Some positioning mark (4) on the cap will blends of gasoline, particularly winter 23

line up with the "unlocked" 0000-GXX-6420-A0 blends, are more volatile and can symbol (5) on the fuel tank housing. contribute to fuel spraying. An improperly tightened fuel filler cap – Never remove the cap by turning it Removing the Toolless Fuel Cap: Turn can loosen or come off and spill directly to the open position. First Slowly and Stop in the Vent Position quantities of fuel. To reduce the risk of allow the saw to cool adequately fuel spillage and fire from an improperly and then release any residual installed fuel cap, correctly position and WARNING pressure at the vent position (2). tighten the cap in the fuel tank opening: 123 – Never attempt to remove the cap – Raise the grip on the top of the cap while the engine is still hot or 4 until it is upright at a 90° angle. running. Insert the cap in the fuel tank opening with the exterior positioning mark (1) lined up with the "unlocked" symbol (2) on the fuel 5 tank housing. 0000-GXX-6419-A0 – Using the grip, press the cap down firmly while turning it clockwise to After allowing the chain saw to cool, the closed position (approximately remove the fuel filler cap slowly and 1/4 urn). In the closed position, the carefully to allow any remaining interior (4) and exterior (1) pressure build-up in the tank to release: positioning marks will align with the – Flip up the grip and press the cap "locked" symbol (3) on the fuel tank down firmly (1). housing. – While maintaining steady, – Fold the grip flush with the top of the downward pressure, turn the cap cap and check for tightness. slowly counter-clockwise to the vent position (2), approximately a 1/8 turn of the cap.

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Misaligned, Damaged or Broken Cap A BC spraying. Always follow the instructions 1 in this section when removing the fuel WARNING cap. To relieve vapor lock: ABC – Place the Master Control Lever in 1 1 1 the cold start position l and pull 2 the starter cord approximately 20 0000-GXX-6422-A1 times to clear the vapor and send N Drop the cap into the fuel tank liquid fuel into the carburetor. 2 2 2 opening (A). – To start the chain saw, move the

0000-GXX-6421-A0 N Master Control Lever to the starting Next, turn the cap counter- n clockwise with slight pressure until it throttle position and pull the If the cap does not drop fully into the fuel drops fully into the fuel tank opening starter cord approximately 10 times. tank opening when the positioning (approximately 1/4 turn) (B). This – marks (1, 2) line up, or if it does not If your chain saw will not restart, or will rotate the base of the cap into tighten properly when turned, the base if vapor lock occurs again, the chain the correct starting position for of the cap may be prematurely rotated in saw is being used in conditions too installation (C). The exterior relation to the top. Such misalignment extreme for the fuel being used. positioning mark (1) on the cap will can result from handling, cleaning or an Discontinue use and let the engine line up with the "unlocked" improper attempt at tightening. cool completely before attempting symbol (2) on the fuel tank housing. to start the chain saw. – Illustrations A and B: The base of The interior positioning mark should Before Operation the cap is prematurely rotated to the be under the grip and not in line with closed position and is not in the the outer positioning mark (1). Take off the chain guard (scabbard) and correct starting position for inspect the chain saw for proper N Then, turn the cap clockwise, installation. The tank will not seal in condition and operation. (See the closing it normally. this configuration. Note: in maintenance chart near the end of the Illustrations A and B, the interior If your fuel cap still does not tighten instruction manual.) positioning marks (1) are in line with properly, it may be damaged or broken. the exterior position marks (2). Stop using the chain saw and take it to WARNING your authorized STIHL dealer for repair. – Illustration C: The bottom of the cap Always check your chain saw for proper is in the correct starting position for Vapor Lock condition and operation before starting, installation. Note: In Illustration C, particularly the throttle trigger, throttle the interior positioning mark (1) is WARNING trigger lockout, stop switch and cutting under the grip and not in line with attachment. The throttle trigger must the outer position mark (2). Vapor lock occurs when fuel in the fuel line or carburetor vaporizes, causing move freely and always spring back to To return the base of the cap to the bubbles to block the free flow of liquid the idle position. The Master Control proper starting position for installation: Lever / stop switch must move easily to fuel into the carburetor. Vapor lock † cannot be relieved or affected by STOP, 0 or . Never attempt to modify opening the fuel tank. Removing the fuel the controls or safety devices. filler cap without first allowing the chain saw to cool adequately can result in fuel

Chain Saw Safety Manual 7 English

tensioning the saw chain in order to Starting WARNING secure the bar. Never start the chain Check fuel system for leaks, especially saw with the sprocket cover loose. WARNING the visible parts, e.g., filler cap, hose Check chain tension once more after To reduce the risk of fire and burn connections, manual fuel pump (only for having tightened the nut(s) and injuries, start the engine at least 10 feet chain saws equipped with a manual fuel thereafter at regular intervals (whenever (3 m) from the fueling spot, outdoors pump). Do not start the engine if there the saw is shut off). If the saw chain only. are leaks or damage – risk of fire. Have becomes loose while cutting, shut off the the chain saw repaired by a STIHL engine and then tighten. Never try to Start and operate your chain saw servicing dealer before using it. adjust the saw chain while the engine is without assistance. For specific starting running. instructions, see the appropriate section WARNING of the instruction manual. Proper starting WARNING methods reduce the risk of injury. Check that the spark plug boot is securely mounted on the spark plug – a After adjusting a saw chain, start the WARNING loose boot may cause arcing that could chain saw, let the engine run for a while, ignite combustible fumes and cause a then switch engine off and recheck saw To reduce the risk of injury from saw fire. chain tension. Proper saw chain tension chain contact and / or reactive forces, is very important at all times. the chain brake must be engaged when For proper assembly of the bar and saw starting the chain saw. If your chain saw chain follow the procedure described in Keep the handles clean and dry at all is equipped with the Quickstop Plus the chapter "Mounting the Bar and times; it is particularly important to keep chain brake system, it is not sufficient to Chain" of your instruction manual. them free of moisture, pitch, oil, fuel mix, engage that brake only for starting, STIHL Oilomatic saw chain, guide bar grease or resin in order for you to because the saw chain may begin to and sprocket must match each other in maintain a firm grip and properly control rotate at high speed when the throttle gauge and pitch. Before replacing any your chain saw . trigger lockout is depressed (releasing bar and chain, see the chapter entitled the brake) in order to blip the throttle "Specifications" in the instruction WARNING trigger after starting. manual and the chapter "Reactive Be sure that the guide bar and saw chain Forces including Kickback". are clear of you and all other WARNING Since longer bars add weight and may obstructions and objects, including the be more difficult to control, select the ground. If the upper quadrant of the tip of Do not drop start. This method is very shortest bar that will meet your cutting the bar touches any object, it may cause dangerous because you may lose needs. kickback to occur (see section on control of the chain saw. reactive forces). Never attempt to start There are two recommended methods WARNING the chain saw when the guide bar is in a for starting your chain saw. cut or kerf. Proper tension of the chain is extremely important. In order to avoid improper For specific starting instructions, see the setting, the tensioning procedure must appropriate section of your instruction be followed as described in your manual. manual. Always make sure the hexagonal nut(s) for the sprocket cover is (are) tightened securely after

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handle of the saw tightly between your legs just above the knees. Maintain WARNING good balance and secure footing. Pull When you pull the starter grip, do not the starting grip slowly with your right wrap the starter rope around your hand. hand until you feel a definite resistance Do not let the grip snap back, but guide and then give it a brisk, strong pull. the starter rope to rewind it properly. Failure to follow this procedure may WARNING result in injury to your hand or fingers 001BA113 KN and may damage the starter Be sure that the guide bar and saw chain mechanism. With the first recommended method, the are clear of you and all other chain saw is started on the ground. obstructions and objects, including the Important Adjustments Make sure the chain brake is engaged ground. When the engine is started, the (see "Chain Brake" chapter in your engine speed with the starting throttle WARNING instruction manual) and place the chain lock engaged will be fast enough for the saw on firm ground or other solid surface clutch to engage the sprocket and, if the To reduce the risk of personal injury in an open area. Maintain good balance chain brake is not activated, turn the saw from loss of control and / or contact with and secure footing. chain. If the upper quadrant of the tip of the running cutting tool, do not use your Grip the front handlebar of the saw firmly the bar touches any object, it may cause chain saw with incorrect idle adjustment. with your left hand and press down. For kickback to occur (see section on At correct idle speed, the cutting tool saws with a rear handle level with the reactive forces). To reduce this risk, should not move. For directions on how ground, put the toe of your right foot into always engage the chain brake before to adjust idle speed, see the appropriate the rear handle and press down. With starting. Never attempt to start the chain section of your instruction manual. your right hand pull out the starter grip saw when the guide bar is in a cut or If you cannot set the correct idle speed, slowly until you feel a definite resistance kerf. have your STIHL dealer check your and then give it a brisk, strong pull. Once the engine has started, chain saw and make proper adjustments immediately blip the throttle trigger, and repairs. which should release the Master Control Holding and Controlling the Chain Saw lever to the run position and allow the engine to slow down to idle. Always hold the chain saw firmly with both hands when the engine is running. Always disengage chain brake before Place your left hand on the front handle accelerating engine and before starting bar and your right hand on the rear cutting work. The only exception to this handle and throttle trigger. rule is when you check operation of the 001BA114 KN chain brake. High revs with the chain The second recommended method for brake engaged (chain locked) will starting your chain saw allows you to quickly damage the powerhead and start the saw without placing it on the chain drive (clutch, chain brake). ground. Make sure the chain brake is engaged, grip the front handle of the chain saw firmly with your left hand. Keep your arm on the front handle in a locked (straight) position. Hold the rear

Chain Saw Safety Manual 9 English

WARNING Keep proper footing and balance at all times. Special care must be taken in slippery conditions (wet ground, snow) and in difficult, overgrown terrain. Be extremely cautious when working on slopes or uneven ground. Watch for 001BA087 LÄ hidden obstacles such as tree stumps, Left-handers should follow these roots, rocks, holes and ditches to avoid instructions too. Wrap your fingers stumbling. There is increased danger of tightly around the handles, keeping the slipping on freshly debarked logs. For handles cradled between your thumb better footing, clear away fallen and forefinger. With your hands in this branches, scrub and cuttings. Use position, you can best oppose and extreme caution when cutting small-size absorb the push, pull and kickback brush, branches and saplings because forces of your saw without losing control slender material may catch the saw (see section on reactive forces). chain and be whipped toward you or pull you off balance. 001BA031 KN WARNING WARNING WARNING To reduce the risk of seri- To reduce the risk of injury from loss of ous or fatal injury to the Take extreme care in wet and freezing control, never work on a ladder or any operator or bystanders weather (rain, snow, ice). Put off the other insecure support. Never hold the from loss of control, work when the weather is windy, stormy machine above shoulder height. Do not never use the chain saw or rainfall is heavy. overreach. with one hand. It is more difficult for you to control reactive forces and to prevent the bar and chain from skating or bouncing along the limb or log.

WARNING

To reduce the risk of cut injuries, keep 001BA082 KN hands and feet away from the cutting tool. Never touch a moving cutting tool Position the chain saw in such a way with your hand or any other part of your that your body is clear of the cutting body. attachment whenever the engine is running. Stand to the left of cut while bucking.

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Never put pressure on the chain saw when reaching the end of a cut. The WARNING WARNING pressure may cause the bar and rotating As soon as the engine is Use of this chain saw (including saw chain to pop out of the cut or kerf, go running, this product gen- sharpening the saw chain) can also out of control and strike the operator or erates toxic exhaust generate dust, mist and fumes some other object. If the rotating saw fumes containing chemi- containing chemicals that are known to chain strikes some other object, a cals, such as unburned cause respiratory problems, cancer, reactive force may cause the moving hydrocarbons (including birth defects, or other reproductive saw chain to strike the operator. benzene) and carbon harm. If you are unfamiliar with the risks STIHL recommends that first-time users monoxide, that are associated with the particular dust, mist should cut logs on a sawhorse – see known to cause respira- or fume at issue, consult your employer, "Cutting small logs." tory problems, cancer, governmental agencies such as OSHA birth defects, or other and NIOSH and other sources on Working Conditions reproductive harm. Some hazardous materials. California and Operate and start your chain saw only of the gases (e. g. carbon some other authorities, for instance, outdoors in a well-ventilated area. monoxide) may be color- have published lists of substances Operate it under good visibility and less and odorless. To known to cause cancer, reproductive daylight conditions only. Work carefully. reduce the risk of serious toxicity, etc. or fatal injury/illness from WARNING inhaling toxic fumes, WARNING never run the machine Your chain saw is a one-person indoors or in poorly venti- Inhalation of certain dusts, especially machine. Do not allow other persons in lated locations. If exhaust organic dusts such as mold or pollen, the general work area, even when fumes become concen- can cause susceptible persons to have starting. Stop the engine immediately if trated due to insufficient an allergic or asthmatic reaction. you are approached. ventilation, clear obstruc- Substantial or repeated inhalation of tions from work area to dust and other airborne contaminants, in WARNING permit proper ventilation particular those with a smaller particle before proceeding and/or size, may cause respiratory or other Even though bystanders should be kept take frequent breaks to illnesses. This includes wood dust, away from the running chain saw, never allow fumes to dissipate especially from hardwoods, but also work alone. Keep within calling distance before they become from some softwoods such as Western of others in case help is needed. concentrated. Red Cedar. Control dust (such as saw dust), mists (such as oil mist from chain WARNING lubrication) and engine fumes at the WARNING source where possible. Use good work To reduce the risk of injury to bystanders Operate your chain saw so that it practices, such as always cutting with a and damage to property, never let your produces a minimum of noise and properly sharpened saw chain (which chain saw run unattended. When it is not emissions – do not run engine produces wood chips rather than fine in use (e. g. during a work break), shut it unnecessarily and accelerate the engine dust) and operating the unit so that the off and make sure that unauthorized only for cutting. wind or operating process directs any persons do not use it. dust raised by the chain saw away from the operator. Follow the recommendations of

Chain Saw Safety Manual 11 English

EPA/OSHA/NIOSH and occupational removed. To reduce the risk of personal and trade associations with respect to WARNING injury, do not operate a chain saw with a dust ("particulate matter"). When the Never touch a saw chain with your hand damaged or missing chain catcher. inhalation of dust cannot be or any part of your body when the engine substantially controlled, i.e., kept at or is running, even when the chain is not WARNING near the ambient (background) level, the rotating. operator and any bystanders should Inspect antivibration elements wear a respirator approved by NIOSH / In the event of an emergency, switch off periodically. Replace damaged, broken MSHA for the type of dust encountered. the engine immediately – move the or excessively worn antivibration Master Control Lever to STOP, 0 or †. elements immediately, since they may result in loss of control of the saw. A WARNING WARNING "sponginess" in the feel of the saw, Breathing asbestos dust is dangerous increased vibration or increased and can cause severe or fatal injury, Always stop the engine before putting "bottoming" during normal operation respiratory illness or cancer. The use the chain saw down. may indicate damage, breakage or and disposal of asbestos-containing excessive wear. Antivibration elements products have been strictly regulated by WARNING should always be replaced in sets. If you OSHA and the Environmental Protection have any questions as to whether the Agency. Do not use your chain saw to The saw chain continues to move for a antivibration elements should be cut or disturb asbestos or asbestos- short period after the throttle trigger is replaced, consult your STIHL servicing containing products. If you have any released (flywheel effect). dealer. reason to believe that you might be Accelerating the engine while the saw If this chain saw is subjected to cutting asbestos, immediately stop chain is blocked increases the load and unusually high loads for which it was not cutting and contact your employer or a will cause the clutch to slip continuously. designed (e. g. heavy impact or a fall), local OSHA representative. This may occur if the throttle is always check that it is in good condition Operating Instructions depressed for more than a few seconds before continuing work. Check in when the saw chain is pinched in the cut particular that the fuel system is tight (no or the chain brake is engaged. It can WARNING leaks) and that the controls and safety result in overheating and damage to devices are working properly. Do not Do not operate your chain saw with the important components (e. g. clutch, continue operating this chain saw if it is starting throttle lock engaged. Cutting polymer housing components) – which damaged. In case of doubt, have it with the starting throttle lock engaged can then increase the risk of injury, e. g., checked by your STIHL servicing dealer. does not permit the operator proper from the saw chain moving while the control of the chain saw or saw chain engine is idling. Your chain saw is not designed for speed. Begin and continue cutting with prying or shoveling away limbs, roots or other objects. Such use could damage the saw at full throttle, engage the WARNING bumper spike firmly in the wood (if the cutting attachment or AV system. possible) and then continue cutting. Your chain saw is equipped with a chain Always work with the bumper spike so catcher. It is designed to reduce the risk WARNING that you have better control of the saw. If of personal injury in the event of a When sawing, make sure that the saw you work without the bumper spike the thrown or broken saw chain. From time chain does not touch any foreign chain saw may pull you forwards to time, the catcher may be damaged or materials such as rocks, fences, nails suddenly.

12 Chain Saw Safety Manual English and the like. Such objects may be flung hot for a while after stopping the engine. off, damage the saw chain or cause the To reduce risk of burns, do not touch the WARNING chain saw to kickback. muffler and other parts while they are Some STIHL chain saws hot. Keep the area around the muffler are equipped with a cata- clean. Remove excess lubricant and all WARNING lytic converter, which is debris such as pine needles, branches designed to reduce the If the rotating saw chain strikes a rock or or leaves. Let the engine cool down exhaust emissions of the other hard object, sparks may be sitting on concrete, metal, bare ground engine by a chemical pro- created, which can ignite flammabale or solid wood (e.g. the trunk of a felled cess in the muffler. Due materials under certain circumstances. tree) away from any combustible to this process, the muf- Flammable materials can include dry substances. vegetation and brush, particularly when fler does not cool down - weather conditions are hot and dry. Do as rapidly as conven WARNING not use your chain saw around tional mufflers when the flammable materials or around dry An improperly mounted or damaged engine returns to idle or vegetation or brush when there is a risk cylinder housing or a is shut off. To reduce the - of fire or wildfire. Contact your local fire damaged/deformed muffler shell may risk of fire and burn inju authorities or the U.S. Forestry Service if interfere with the cooling process of the ries when using a you have any question about whether muffler. To reduce the risk of fire or burn catalytic converter, vegetation and weather conditions are injury, do not continue work with a always set your chain suitable for the use of a chain saw. damaged or improperly mounted saw down in the upright cylinder housing or a position and never locate damaged/deformed muffler shell. it where the muffler is WARNING near dry brush, grass, Take special care when cutting Your muffler is furnished with a spark wood chips or other com- shattered wood because of the risk of arresting screen designed to reduce the bustible materials while it injury from slivers being caught and risk of fire from the emission of hot is still hot. thrown in your direction. particles. Never operate your unit with a missing or damaged spark arresting screen. If your gas/oil mix ratio is correct WARNING (i.e., not too rich), this screen will Never modify your muffler. Any normally stay clean as a result of the modification could cause an increase in heat from the muffler and need no heat radiation, sparks or sound level, service or maintenance. If you thereby increasing the risk of fire, burn experience loss of performance and you injury or hearing loss. You may also suspect a clogged screen, have your permanently damage the engine. Have muffler maintained by a STIHL servicing your muffler serviced and repaired by dealer. Some state or federal laws or your STIHL servicing dealer only. regulations may require a properly maintained spark arrester for certain uses. See the "Maintenance, Repair and WARNING Storing" section of these Safety The muffler and other parts of the engine Precautions. Remember that the risk of (e.g. fins of the cylinder, spark plug) a brush or forest fire is greater in hot or become hot during operation and remain dry conditions.

Chain Saw Safety Manual 13 English

DANGER WARNING WARNING Do not rely on the chain Always stop the engine and make sure Do not operate your power tool if the saw ’s insulation against that the cutting tool is stopped before muffler is damaged, missing or modified. electric shock. To reduce doing any maintenance or repair work or An improperly maintained muffler will the risk of electrocution, cleaning the power tool. increase the risk of fire and hearing loss. never operate this chain Your muffler is equipped with a spark- saw in the vicinity of any WARNING arresting screen to reduce the risk of wires or cables (power, fire; never operate your power tool if the etc.) which may be carry- Do not attempt any maintenance or screen is missing, damaged or clogged. ing electric current.To repair work not described in your Remember that the risk of a brush or reduce risk of electrocu- instruction manual. Have such work forest fire is greater in hot or dry tion, take extra performed by your STIHL servicing weather. dealer only. For example, if improper precautions when cutting In California, it is a violation of § 4442 or near power lines. Have tools are used to remove the flywheel or if an improper tool is used to hold the § 4443 of the Public Resources Code to the power switched off use or operate gasoline-powered tools before starting cutting flywheel in order to remove the clutch, structural damage to the flywheel could on forest-covered, brush-covered or work in the immediate grass-covered land unless the engine’s vicinity of power lines. occur and could subsequently cause the flywheel to burst. exhaust system is equipped with a complying spark arrester that is MAINTENANCE, REPAIR AND Wear gloves when handling or maintained in effective working order. STORING performing maintenance on saw chains. The owner/operator of this product is responsible for properly maintaining the Maintenance, replacement, or repair of WARNING spark arrester. Other states or the emission control devices and governmental entities/agencies, such as Use the specified spark plug and make the U.S. Forest Service, may have systems may be performed by any sure it and the ignition lead are always nonroad engine repair establishment or similar requirements. Contact your local clean and in good condition. Always fire agency or forest service for the laws individual. However, if you make a press spark plug boot snugly onto spark warranty claim for a component which or regulations relating to fire protection plug terminal of the proper size. (Note: If requirements. has not been serviced or maintained terminal has detachable SAE adapter properly, STIHL may deny coverage. nut, it must be securely attached.) A Keep the chain, bar and sprocket clean; loose connection between spark plug replace worn sprockets or chains. Keep WARNING terminal and the ignition wire connector the chain sharp. You can spot a dull in the boot may create arcing that could chain when easy-to-cut wood becomes Use only identical STIHL replacement ignite combustible fumes and cause a hard to cut and burn marks appear on parts for maintenance and repair. Use of fire. the wood. Keep the chain at proper non-STIHL parts may cause serious or tension. fatal injury. WARNING Tighten all nuts, bolts and screws except Strictly follow the maintenance and the carburetor adjustment screws after Never test the ignition system with the repair instructions in the appropriate each use. section of your instruction manual. spark plug boot removed from the spark Please refer to the maintenance chart in plug or with a removed spark plug, since this manual. uncontained sparking may cause a fire.

14 Chain Saw Safety Manual English

Do not clean your machine with a WARNING pressure washer. The solid jet of water Reactive Forces In order for the chain brake on your may damage parts of the machine. STIHL chain saw to properly perform its Store chain saw in a dry place and away REACTIVE FORCES INCLUDING function of reducing the risk of kickback from children. Before storing for longer KICKBACK and other injuries, it must be properly than a few days, always empty the fuel maintained. Like an automobile brake, a tank (see chapter "Storing the Machine" chain saw chain brake incurs wear each in the instruction manual). time it is engaged. WARNING The amount of wear will vary depending Reactive forces may occur any time the upon usage, conditions under which the chain is rotating. Reactive forces can saw is used and other factors. Excessive cause serious personal injury. wear will reduce the effectiveness of the chain brake and can render it inoperable. For the proper and effective operation of the chain brake, the brake band and clutch drum must be kept free of dirt, grease and other foreign matter which may reduce friction of the band on the

drum. 001BA257 KN

For these reasons, each STIHL chain The powerful force used to cut wood can saw should be returned to trained be reversed and work against the personnel such as your STIHL servicing operator. If the rotating saw chain is dealer for periodic inspection and suddenly and significantly slowed or servicing of the brake system according stopped by contact with any solid object to the following schedule: such as a log or branch or is pinched, the Heavy usage – every three months, reactive forces may occur instantly. Moderate usage – twice a year, These reactive forces may result in loss Occasional usage – annually. of control, which, in turn, may cause serious or fatal injury. An understanding The chain saw should also be returned of the causes of these reactive forces immediately for maintenance whenever may help you avoid the element of the brake system cannot be thoroughly surprise and loss of control. Surprise cleaned or there is a change in its contributes to accidents. operating characteristics. The most common reactive forces are: For any maintenance of the emission control system please refer to the – kickback, maintenance chart and to the limited – pushback, warranty statement near the end of the instruction manual. – pull-in.

Chain Saw Safety Manual 15 English

pinched during limbing or when it is – must, in their original condition, WARNING incorrectly used to begin a plunge or meet a 45° computer derived Kickback: boring cut. kickback angle when equipped with certain cutting attachments, The greater the force of the kickback Kickback may occur reaction, the more difficult it becomes for – and must be equipped with at least when the moving saw the operator to control the chain saw. two devices to reduce the risk of chain near the upper Many factors influence the occurrence kickback injury, such as a chain quadrant of the bar nose and force of the kickback reaction. brake, low kickback saw chain, contacts a solid object or These include saw chain speed, the reduced kickback bar, etc. is pinched. speed at which the bar and saw chain b) Chain saws with a displacement of When this occurs, the energy driving the contact the object, the angle of contact, 3.8 cubic inches (62 cm³) and saw chain can create a force that moves the condition of the saw chain and other above the chain saw in a direction opposite to factors. the saw chain movement at the point – must be equipped with at least one The type of bar and saw chain you use where the saw chain is slowed or device designed to reduce the risk is an important factor in the occurrence stopped. This may fling the bar up and of kickback injury, such as a chain and force of the kickback reaction. Some back in a lightning fast reaction mainly in brake, low kickback saw chain, STIHL bar and saw chain types are the plane of the bar and can cause reduced kickback bar, etc. designed to reduce kickback forces. severe or fatal injury to the operator. STIHL recommends the use of reduced The computer derived angles for chain kickback bars and low kickback chains. saws below 3.8 cubic inches (62 cm³) displacement are measured by applying Chain Saw Kickback Standard a computer program to test results from a kickback test machine.

The following standard apply with respect to kickback: WARNING – § 5.11 of ANSI/OPEI B175.1-2012 The computer derived angles of the chain saw kickback standard may bear This standard, in the following referred no relationship to actual kickback bar to as "the chain saw kickback standard" rotation angles that may occur in real life sets certain performance and design cutting situations. criteria related to chain saw kickback. In addition, features designed to reduce To comply with the chain saw kickback kickback injuries may lose some of their standard: effectiveness when they are no longer in a) Chain saws with a displacement of their original condition, especially if they less than 3.8 cubic inches (62 cm³) have been improperly maintained. Compliance with the chain saw kickback 001BA035 KN standard does not automatically mean Kickback may occur, for example, when that in a real life kickback the bar and the saw chain near the upper quadrant saw chain will rotate at most 45°. of the bar nose contacts the wood or is

16 Chain Saw Safety Manual English

STIHL Quickstop Chain Brake WARNING STIHL has developed a saw chain In order for chain saws below 3.8 cubic stopping system designed to reduce the inches (62 cm³) displacement to comply risk of injury in certain kickback with the computed kickback angle situations. It is called a Quickstop chain requirements of the chain saw kickback brake. 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 001BA174 KN "low kickback saw chain." There are two mechanisms for activating See the section on "Low Kickback Saw the chain brake if it is in a properly Chain and Reduced Kickback Bars." maintained condition:

Devices for Reducing the Risk of – manual activation: If a kickback Kickback Injury occurs, the chain saw moves upwards towards the user in a rotating motion around the front Stihl recommends the use of green handle. The brake is designed to labeled reduced kickback bars and low engage if the left hand contacts the kickback saw chains on your chain saw front guard, which is the activation equipped with a Stihl Quickstop chain lever for the brake, and pushes it brake. forward. – inertia activation: All STIHL chain WARNING saws are equipped with an interia To reduce the risk of injury, never use a Quickstop chain brake. If the chain saw if the chain brake does not kickback impulse is strong enough, function properly. Take the chain saw to this alone is sufficient to engage the your local STIHL servicing dealer. Do brake even without contacting the not use the chain saw until the problem front hand guard. has been rectified.

Chain Saw Safety Manual 17 English

chain is pinched or otherwise caught in needs, having experience and WARNING the cut. Clutch slippage can cause specialized training for dealing with Never operate your chain saw without a excessive heat, leading to severe kickback. damage of the motor housing, clutch front hand guard. In a kickback situation STIHL recommends the use of its green and oiler component and may interfere this guard helps protect your left hand labeled reduced kickback bars, green with the operation of the chain brake. If and other parts of your body. In addition, labeled low kickback saw chains and a clutch slippage in excess of 3 seconds removal of the hand guard on a chain chain saw equipped with a STIHL has occurred, allow the motor housing to saw equipped with a Quickstop chain Quickstop chain brake for both cool before proceeding and check the brake will disable the activation experienced and inexperienced chain operation of your chain brake as mechanism of the chain brake. saw users. described in the chapter entitled "Chain Brake" of your instruction manual. Also Please ask your STIHL dealer to WARNING make sure that the saw chain is not properly match your chain saw with the No Quickstop or other chain brake turning at idle speed (see above at appropriate bar / saw chain combination device prevents kickback. These "Important Adjustments"). to reduce the risk of kickback injury. Green labeled bars and saw chains are devices are designed to reduce the risk Low Kickback Saw Chain and Reduced recommended for all chain saws. of kickback injury, if activated, in certain Kickback Bars kickback situations. In order for the Quickstop to reduce the risk of kickback STIHL offers a variety of bars and saw WARNING injury, it must be properly maintained chains. STIHL reduced kickback bars and in good working order. See the and low kickback saw chains are Use of other, non-listed bar / saw chain chapter of your instruction manual designed to reduce the risk of kickback combinations may increase kickback entitled "Chain Brake" and the section injury. Other saw chains are designed to forces and the risk of kickback injury. "Maintenance, Repair and Storing" at achieve higher cutting performance or New bar / saw chain combinations may the end of these Safety Precautions. In sharpening ease, but in turn are more be developed after publication of this addition, there must be enough distance prone to kickback. literature, which will, in combination with between the bar and the operator to certain chain saws, comply with the STIHL has developed a color code chain saw standard as well. Check with ensure that the Quickstop has sufficient system to help you identify the STIHL time to activate and stop the chain your STIHL dealer for such reduced kickback bars and low kickback combinations. before potential contact with the saw chains. Cutting attachments with operator. green warning labels on the packaging are designed to reduce the risk of WARNING WARNING kickback injury. The matching of green Reduced kickback bars and low marked or labeled chain saws under An improperly maintained chain brake kickback saw chains do not prevent 3.8 cubic inches (62 cm³) displacement kickback, but they are designed to may increase the time needed to stop with green labeled bars and green the saw chain after activation, or may reduce the risk of kickback injury. They labeled saw chains gives compliance are available from your STIHL dealer. not activate at all. with the computed kickback angle requirements of the chain saw standard WARNING WARNING when the products are in their original Never run the chain saw above idle condition. Products with yellow labels Even if your saw is equipped with a speed for more than 3 seconds when the are for users with extraordinary cutting Quickstop, a reduced kickback bar and / chain brake is engaged or when the saw or low kickback saw chain, this does not

18 Chain Saw Safety Manual English eliminate the risk of injury by kickback. Reduced Kickback Bars 7. Cut only one log at a time. Therefore, always observe all safety STIHL green labeled reduced kickback 8. Use extreme caution when precautions to avoid kickback situations. bars are designed to reduce the risk of reentering a previous cut. Low Kickback Saw Chain kickback injury when used with STIHL 9. Do not attempt to plunge cut if you green labeled low kickback saw chains. Some types of saw chains have are not experienced with these specially designed components to cutting techniques. reduce the force of nose contact WARNING 10. Be alert for shifting of the log or kickback. STIHL has developed low When used with other, more aggressive other forces that may cause the cut kickback saw chain for your chain saw. saw chains, these bars may be less to close and pinch the saw chain. A "low kickback saw chain" is a saw effective in reducing kickback. 11. Maintain saw chain properly. Cut chain that has met the kickback with a correctly sharpened, properly performance requirements of WARNING tensioned saw chain at all times. ANSI/OPEI B175.1-2012 when tested according to the provisions specified in For a properly balanced saw and in 12. Stand to the side of the cutting path ANSI/OPEI B175.1-2012. order to comply with the chain saw of the chain saw. standard, use only bar lengths listed in the specifications chapter of the Bow Guides WARNING instruction manual for your chain saw. There are potential chain saw and bar To avoid kickback combinations with which low kickback saw chains can be used which have not The best protection from personal injury WARNING been specifically certified to comply with that may result from kickback is to avoid Do not mount a bow guide on any STIHL the 45° computer derived kickback kickback situations: chain saw. Any chain saw equipped with angle of the chain saw standard. Some 1. Hold the chain saw firmly with both a bow guide is potentially very low kickback saw chains have not been hands and maintain a secure grip. dangerous. The risk of kickback is tested with all chain saw and bar Don’t let go. increased with a bow guide because of combinations. the increased kickback contact area. 2. Be aware of the location of the guide Low kickback saw chain will not bar nose at all times. WARNING significantly reduce the risk of kickback 3. Never let the nose of the guide bar injury when used on a bow guide. A blunt or incorrectly sharpened saw contact any object. Do not cut limbs chain may reduce or negate the effects with the nose of the guide bar. Be of the design features intended to especially careful near wire fences reduce kickback energy. Improper and when cutting small, tough lowering or sharpening of the depth limbs, small size brush and saplings gauges as well as changing the shape of which may easily catch the saw the cutters may increase the risk and the chain. energy of kickback. Always cut with a properly sharpened saw chain. 4. Don't overreach. 5. Don't cut above shoulder height. 6. Begin cutting and continue at full throttle.

Chain Saw Safety Manual 19 English

A=Pull-in B = Pushback Working Techniques

Limbing

Limbing is removing the branches from a fallen tree.

WARNING

B 001BA038 KN A 001BA037 KN There is an extreme danger of kickback Pull-in occurs when the saw chain on the Pushback occurs when the saw chain on during the limbing operation. Do not bottom of the bar is suddenly stopped the top of the bar is suddenly stopped work with the nose of the bar. Be when it is pinched, caught or encounters when it is pinched, caught or encounters extremely cautious and avoid contacting a foreign object in the wood. The a foreign object in the wood. The the log or other limbs with the nose of the reaction of the saw chain pulls the chain reaction of the saw chain may drive the guide bar. saw forward and may cause the chain saw rapidly straight back toward operator to lose control. the operator and may cause loss of Do not stand on a log while limbing it – chain saw control, which, in turn, may you may slip or the log may roll. Pull-in frequently occurs when the cause serious or fatal injury. Pushback bumper spike of the chain saw is not Start limbing by leaving the lower limbs frequently occurs when the top of the bar held securely against the tree or limb to support the log off the ground. When is used for cutting. and when the saw chain is not rotating at underbucking freely hanging limbs, a full speed before it contacts the wood. To avoid pushback pinch may result or the limb may fall, causing loss of control. If a pinch occurs, 1. Be alert to forces or situations that stop the engine and remove the saw by WARNING may cause material to pinch the top lifting the limb. Use extreme caution when cutting small of the saw chain. size brush and saplings which may 2. Do not cut more than one log at a WARNING easily catch the saw chain, be whipped time. towards you or pull you off balance. Be extremely cautious when cutting 3. Do not twist the chain saw when limbs or logs under tension (spring To avoid pull-in withdrawing the bar from a plunge poles). The limbs or logs could spring 1. Always start a cut with the saw cut or underbuck cut because the back toward the operator and cause loss chain rotating at full speed and the saw chain can pinch. of control of the saw and severe or fatal bumper spike in contact with the injury to the operator. wood. 2. The risk of pull-in may also be reduced by using wedges to open the kerf or cut.

20 Chain Saw Safety Manual English

Bucking

2 001BA151 KN

1 001BA152 KN

001BA051 LÄ

When cutting small logs, place log Logs under strain:

001BA033 KN through "V"-shaped supports on top of a Risk of pinching! Always start relieving sawhorse. Never permit another person cut (1) at compression side.Then make Bucking is cutting a log into sections. to hold the log. Never hold the log with bucking cut (2) at tension side. If the saw your leg or foot. pinches, stop the engine and remove it WARNING from the log. When bucking, do not stand on the log. Only properly trained professionals Make sure the log will not roll downhill. If should work in an area where the logs, on a slope, stand on the uphill side of the limbs and roots are tangled. Working in log. Watch out for rolling logs. "blow down" areas is extremely hazardous. Drag the logs into a clear Cut only one log at a time. area before cutting. Pull out exposed Shattered wood should be cut very and cleared logs first. carefully. Sharp slivers of wood may be caught and flung in the direction of the Felling operator of the saw.

Felling is cutting down a tree. Before felling a tree, consider carefully all conditions which may affect the direction of fall.

Chain Saw Safety Manual 21 English

Felling Instructions Escape Path WARNING There are a number of factors that may affect and change the intended direction B of fall, e.g. wind direction and speed, lean of tree, surrounding trees and obstacles, sloping ground, one-sided limb structure, wood structure, decay, 1 snow load, etc. To reduce the risk of 1 /2 1 45¡ 21/2 severe or fatal injury to yourself or 001BA088 LÄ others, look for these conditions prior to A beginning the cut, and be alert for a When felling, maintain a distance of at change in direction while the tree is least 2 1/2 tree lengths from the nearest 45¡ falling. person. When felling in the vicinity of roads, WARNING railways and power lines, etc., take extra precautions. Inform the police, utility B Always observe the general condition of company or railway authority before the tree. Inexperienced users should beginning to cut.

never attempt to cut trees that are 001BA040 KN decayed or rotted inside or that are leaning or otherwise under tension. WARNING First clear the tree base and work area There is an increased risk that such The noise of your engine may drown any from interfering limbs and brush and trees could snap or split while being cut warning call. clean its lower portion with an ax. and cause serious or fatal injury to the Then, establish two paths of escape (B) operator or bystanders. Also look for and remove all obstacles. These paths broken or dead branches which could should be generally opposite to the vibrate loose and fall on the operator. planned direction of the fall of the tree When felling on a slope, the operator (A) and about at a 45° angle. Place all should stand on the uphill side if tools and equipment a safe distance possible. away from the tree, but not on the escape paths.

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Buttress Roots Conventional Cut Open-face Technique

C 001BA146 KN

If the tree has large buttress roots, cut into the largest buttress vertically first (horizontally next) and remove the resulting piece. C Gunning Sight 001BA143 KN

Felling notch (C) – determines the Felling notch (C) – determines the direction of the fall direction of the fall For a conventional cut: For an open-face cut:

001BA153 KN N N Properly place felling notch Properly place felling notch perpendicular to the line of fall, perpendicular to the line of fall, When making the felling notch, use the close to the ground. close to the ground. gunning sight on the shroud and housing N N to check the desired direction of fall: Cut down at approx. 45° angle to a Cut down at approx. 50° angle to a depth of about 1/5 to 1/4 of the trunk depth of approx.1/5 to 1/4 of the Position the saw so that the gunning diameter. trunk diameter. sight points exactly in the direction you N N want the tree to fall. Make second cut horizontal. Make second cut from below at approx. 40 degree angle. N Remove resulting 45° piece. N Remove resulting 90° piece.

Chain Saw Safety Manual 23 English

Making Sapwood Cuts D =Felling Cut E = Hinge

D E 001BA150 KN 001BA144 KN 001BA145 KN

N For medium sized or larger trees Conventional and open-face technique: N Helps control the falling tree. make cuts at both sides of the trunk, N Begin 1 to 2 inches (2,5 to 5 cm) N Do not cut through the hinge – you at same height as subsequent higher than center of felling notch. could lose control of the direction of felling cut. the fall. N Cut horizontally towards the felling N Cut to no more than width of guide notch. bar. N Leave approx.1/10 of diameter This is especially important in softwood uncut. This is the hinge. in summer – it helps prevent sapwood N splintering when the tree falls. Do not cut through the hinge – you could lose control of the direction of the fall. Drive wedges into the felling cut where necessary to control the fall.

WARNING If the tip of the bar contacts a wedge, it may cause kickback. Wedges should be of wood or plastic – never steel, which can damage the chain.

24 Chain Saw Safety Manual English

Felling Cut for Small Diameter Trees: Felling Cut for Large Diameter Trees Simple Fan Cut

1 4

001BA148 KN Avoid repositioning the saw more than

001BA147 KN necessary. When repositioning for the next cut, keep the guide bar fully Engage the bumper spikes of the chain WARNING engaged in the kerf to keep the felling saw directly behind the location of the Felling a tree that has a diameter greater cut straight. If the saw begins to pinch, intended hinge and pivot the saw around than the length of the guide bar requires insert a wedge to open the cut. On the this point only as far as the hinge. The use of either the sectioning felling cut or last cut, do not cut the hinge. bumper spike rolls against the trunk. plunge-cut method. These methods are extremely dangerous because they Plunge-cut Method involve the use of the nose of the guide Timber having a diameter more than bar and can result in kickback. Only twice the length of the guide bar requires properly trained professionals should the use of the plunge-cut method before attempt these techniques. making the felling cut. Sectioning Method First, cut a large, wide felling notch. For the sectioning method make the first Make a plunge cut in the center of the part of the felling cut with the guide bar notch. fanning in toward the hinge. Then, using the bumper spike as a pivot, reposition the saw for the next cut.

Chain Saw Safety Manual 25 English

WARNING In order to reduce the risk of personal injury, never stand directly behind the tree when it is about to fall, since part of the trunk may split and come back towards the operator (barber-chairing), or the tree may jump backwards off the stump. Always keep to the side of the The plunge cut is made with the guide falling tree. When the tree starts to fall, bar nose. Begin the plunge cut by withdraw the bar, shut off the engine and applying the lower portion of the guide walk away on the preplanned escape bar nose to the tree at an angle. Cut until path. Watch out for falling limbs. the depth of the kerf is about the same as the width of the guide bar. Next, align WARNING the saw in the direction in which the recess is to be cut. Be extremely careful with partially fallen trees which are poorly supported. When With the saw at full throttle, insert the the tree hangs or for some other reason guide bar in the trunk. does not fall completely, set the saw aside and pull the tree down with a cable winch, block and tackle or tractor. If you try to cut it down with your saw, you may be injured.

Enlarge the plunge cut as shown in the illustration.

WARNING There is an extreme danger of kickback at this point. Extra caution must be taken to maintain control of the saw. To make the felling cut, follow the sectioning method described previously. If you are inexperienced with a chain saw, plunge-cutting should not be attempted. Seek the help of a professional.

26 Chain Saw Safety Manual English

Maintenance and Care

The following maintenance intervals apply for normal operating conditions only. When working under difficult conditions (high accumulation of dust, highly resinous lumber, lumber from tropical trees, etc.) or longer than normal each day, the specified intervals must be shortened accordingly. If you only use the tool occasionally, extend the intervals accordingly. Before starting work and/or work of end the At daily is refilled tank Whenever Weekly Monthly Annually If faulty damaged If required As

Visual inspection (condition, leaks) XX Complete machine Clean X

Throttle trigger, throttle trigger lockout, choke lever, stop switch, master control lever (dependent Function test XX on equipment) Function test XX Chain brake Have checked by dealer1) X

check X Manual fuel pump (if present) Have repaired by a specialist dealer1) X

check X

Fuel pick-up body / filter in fuel tank Clean, replace filter insert XX

replace XXX

Fuel tank Clean X

Lubricating oil tank Clean X

Chain lubrication check X

Check, pay attention to sharpness XX Saw chain Checking the chain tension XX

sharpen X

Check (wear, damage) X

Clean and turn over X Guide bar Deburr X

replace XX

Chain sprocket check X

Clean XX Air filter replace X

Chain Saw Safety Manual 27 English

check XX Anti-vibration elements Have replaced by servicing dealer1) X

Air intake on fan housing Clean XX X

Cylinder fins Clean XX

Check idle adjustment – saw chain must not XX rotate Carburetor Set the idle speed; if required have the chainsaw X repaired by a specialist dealer1)

Adjust electrode gap X Spark plug Replace after 100 hours of operation

Accessible screws and nuts (except adjusting Tighten2) X screws)

Have checked by dealer1) X

Spark arresting screen in muffler Have cleaned; if required have replaced by spe- X cialist dealer1)

check X Chain catcher replace X Safety information label replace X

1) STIHL recommends STIHL servicing dealer 2) When using professional chainsaws (with a power output of 3.4 kW or more) for the first time, tighten the cylinder block screws after 10 to 20 hours of operation

28 Chain Saw Safety Manual English

Main Parts

1 Shroud Twist Lock 2 Carburetor Adjusting Screws 3 Manual Fuel Pump (Easy Start1)) 13 4 Shutter (Summer and Winter Position, only MS 211) 7 5 Chain Brake 14 1 4 6 Chain Sprocket 3 7 Chain Sprocket Cover 8 Chain Catcher 8 2 5 10 9 Chain Tensioner (lateral) 10 Bumper Spike 6 11 Guide Bar 11 12 Oilomatic Saw Chain 7 9 13 Adjusting Wheel for Quick Chain 12 Tensioner1) 8 14 Handle of Wingnut (Quick Chain Tensioner1)) 15 Oil Filler Cap 16 Muffler 17 18 17 Front Hand Guard 18 Front Handle (Handlebar) 19 19 Spark Plug Boot 20 Starter Grip 21 Fuel Filler Cap 16 20 22 Master Control Lever 24 23 Throttle Trigger 24 Throttle Trigger Lockout 15 22 25 Rear Handle 25 23 26 Rear Hand Guard # Serial Number 26 # 21 533BA015 KN

1) Depending on Model

Chain Saw Safety Manual 29 English

Definitions 12 Oilomatic Saw Chain 22 Master Control Lever A loop consisting of cutters, tie Lever for choke control, starting 1 Shroud Twist Lock straps and drive links. throttle, run and stop switch position. Lock for shroud. 13 Adjusting Wheel for Quick Chain Tensioner 23 Throttle Trigger 2 Carburetor Adjusting Screws Permits precise adjustment of chain Controls the speed of the engine. For tuning the carburetor. tension. 24 Throttle Trigger Lockout 3 Manual Fuel Pump 14 Handle of Wingnut (Quick Chain Must be depressed before the Provides additional fuel feed for a Tensioner) throttle trigger can be activated. cold start. Must be released to allow chain to 25 Rear Handle 4Shutter be tensioned with adjusting wheel. The support handle for the right With summer and winter positions. 15 Oil Filler Cap hand, located at the rear of the saw. Carburetor is heated in winter For closing the oil tank. position. 26 Rear Hand Guard 16 Muffler 5Chain Brake Gives added protection to Reduces engine exhaust noise and operator's right hand. A device to stop the rotation of the diverts exhaust gases away from Guide Bar Nose chain. Is activated in a kickback operator. situation by the operator's hand or The exposed end of the guide bar. by inertia. 17 Front Hand Guard (not illustrated, see chapter 6 Chain Sprocket Provides protection against "Tensioning the Saw Chain") projecting branches and helps Clutch The toothed wheel that drives the prevent left hand from touching the saw chain. chain if it slips off the handlebar. It Couples engine to chain sprocket 7 Chain Sprocket Cover also serves as the lever for chain when engine is accelerated beyond idle speed. (not illustrated) Covers the clutch and chain brake activation. sprocket. 18 Front Handle (Handlebar) Anti-Vibration System 8 Chain Catcher Handlebar for the left hand at the The anti-vibration system includes a front of the saw. number of anti-vibration elements Helps to reduce the risk of operator designed to reduce the contact by a chain if it breaks or 19 Spark Plug Boot transmission of vibrations created comes off the bar. Connects the spark plug with the by the engine and cutting 9 Chain Tensioner (lateral) ignition lead. attachment to the operator's hands. (not illustrated) Permits precise adjustment of chain 20 Starter Grip tension. The grip of the pull starter, for 10 Bumper Spike starting the engine. Toothed stop for holding saw steady 21 Fuel Filler Cap against wood. For closing the fuel tank. 11 Guide Bar Supports and guides the saw chain.

30 Chain Saw Safety Manual English

Chain Saw Safety Manual 31 English

32 Chain Saw Safety Manual

WARNING

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

0457-184-3021 englisch USA U www.stihl.com *04571843021* 0457-184-3021