Instruction Manual
Page 3
.... 1 © ANDREAS STIHL AG & Co. Careless or improper use may cause serious or even fatal injury. { MS 251, MS 251 C This instruction manual is a high-speed wood-cutting tool, some special safety precautions must be recycled. Guide to Using this Manual 2 Safety Precautions and Working Techniques 3 Cutting Attachment 25 Mounting the Bar and Chain (side chain tensioner) 26...
.... 1 © ANDREAS STIHL AG & Co. Careless or improper use may cause serious or even fatal injury. { MS 251, MS 251 C This instruction manual is a high-speed wood-cutting tool, some special safety precautions must be recycled. Guide to Using this Manual 2 Safety Precautions and Working Techniques 3 Cutting Attachment 25 Mounting the Bar and Chain (side chain tensioner) 26...
Instruction Manual
Page 4
... manual, please contact your STIHL dealer or the STIHL distributor for assistance. 2 MS 251, MS 251 C If the operating characteristics or the appearance of severe or fatal injury. English Guide to Using this Manual This Instruction Manual refers to a STIHL chain saw, also called a machine in this manual. chain oil Engaging and disengaging the STIHL Quickstop chain brake Direction of gasoline...
... manual, please contact your STIHL dealer or the STIHL distributor for assistance. 2 MS 251, MS 251 C If the operating characteristics or the appearance of severe or fatal injury. English Guide to Using this Manual This Instruction Manual refers to a STIHL chain saw, also called a machine in this manual. chain oil Engaging and disengaging the STIHL Quickstop chain brake Direction of gasoline...
Instruction Manual
Page 5
..., they will cut you how to certain times by strenuous work on reactive forces. Do not operate this manual. MS 251, MS 251 C 3 Observe all STIHL chain saws. WARNING Be alert - WARNING The use of this chain saw may be strenuous. If the cutters contact your model. WARNING Do not lend or rent your doctor before transporting...
..., they will cut you how to certain times by strenuous work on reactive forces. Do not operate this manual. MS 251, MS 251 C 3 Observe all STIHL chain saws. WARNING Be alert - WARNING The use of this chain saw may be strenuous. If the cutters contact your model. WARNING Do not lend or rent your doctor before transporting...
Instruction Manual
Page 6
...tend to have higher vibration levels. - Never wear sandals, flip-flops or go barefoot. MS 251, MS 251 C In order to reduce the risk of a very low intensity. Keep the AV system...recommended for cold weather use of whitefinger disease. A dull saw chain will increase cutting time, and pressing a dull saw chain through wood will not sustain whitefinger disease or carpal tunnel syndrome. Maintain ...tissue necrosis. All the above-mentioned precautions do not squeeze the handles with some STIHL chain saws, are available on some pacemakers. Heavy-duty, nonslip gloves improve your grip ...
...tend to have higher vibration levels. - Never wear sandals, flip-flops or go barefoot. MS 251, MS 251 C In order to reduce the risk of a very low intensity. Keep the AV system...recommended for cold weather use of whitefinger disease. A dull saw chain will increase cutting time, and pressing a dull saw chain through wood will not sustain whitefinger disease or carpal tunnel syndrome. Maintain ...tissue necrosis. All the above-mentioned precautions do not squeeze the handles with some STIHL chain saws, are available on some pacemakers. Heavy-duty, nonslip gloves improve your grip ...
Instruction Manual
Page 7
...damaged. Only attachments supplied by STIHL or expressly approved by STIHL for which you also wear a face shield or face screen over the saw chain and guide bar, which should have it is tight (no leaks) and that you are authorized. If this chain saw . 001BA275 KN MS 251, MS 251 C 5 In case of... injury to the chain saw is ...
...damaged. Only attachments supplied by STIHL or expressly approved by STIHL for which you also wear a face shield or face screen over the saw chain and guide bar, which should have it is tight (no leaks) and that you are authorized. If this chain saw . 001BA275 KN MS 251, MS 251 C 5 In case of... injury to the chain saw is ...
Instruction Manual
Page 8
... a 90° angle. Using the grip, press the cap down firmly while turning it clockwise as far as to get fuel on your chain saw in the fuel 001BA234 KN tank with this happens, change your instruction manual). Use extreme caution when handling gasoline or fuel mix. Fueling ... system. Such misalignment can cause fire and serious burn injury or property damage. Select bare ground for fueling and move at tightening. 6 MS 251, MS 251 C If this STIHL cap, raise the grip on the top of the cap until the leak is an extremely flammable fuel. Always shut off any spilled fuel...
... a 90° angle. Using the grip, press the cap down firmly while turning it clockwise as far as to get fuel on your chain saw in the fuel 001BA234 KN tank with this happens, change your instruction manual). Use extreme caution when handling gasoline or fuel mix. Fueling ... system. Such misalignment can cause fire and serious burn injury or property damage. Select bare ground for fueling and move at tightening. 6 MS 251, MS 251 C If this STIHL cap, raise the grip on the top of the cap until the leak is an extremely flammable fuel. Always shut off any spilled fuel...
Instruction Manual
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...by a STIHL servicing dealer before starting, particularly the throttle trigger, throttle trigger lockout, stop switch must match each other in line with outer mark. MS 251, MS 251 C 7 inner mark is shut off the engine and then tighten. Do not start the chain saw, let the engine run for chain saws ...equipped with a manual fuel pump). Proper saw chain tension is running! 1 Left: Right: Bottom of...
...by a STIHL servicing dealer before starting, particularly the throttle trigger, throttle trigger lockout, stop switch must match each other in line with outer mark. MS 251, MS 251 C 7 inner mark is shut off the engine and then tighten. Do not start the chain saw, let the engine run for chain saws ...equipped with a manual fuel pump). Proper saw chain tension is running! 1 Left: Right: Bottom of...
Instruction Manual
Page 10
... tip of your chain saw when the guide bar is particularly important to maintain a firm grip and properly control your right foot into the rear handle and press down . Start and operate your arm on firm ground or other solid surface in a cut or kerf. 8 MS 251, MS 251 C For saws ...with a rear handle level with your right hand until you to keep them free of injury. The second recommended method for starting . WARNING Be sure that the guide bar and saw chain contact and / or reactive forces, the chain brake must be fast enough...
... tip of your chain saw when the guide bar is particularly important to maintain a firm grip and properly control your right foot into the rear handle and press down . Start and operate your arm on firm ground or other solid surface in a cut or kerf. 8 MS 251, MS 251 C For saws ...with a rear handle level with your right hand until you to keep them free of injury. The second recommended method for starting . WARNING Be sure that the guide bar and saw chain contact and / or reactive forces, the chain brake must be fast enough...
Instruction Manual
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...debarked logs. WARNING To reduce the risk of cut injuries, keep hands and feet away from loss of serious or fatal injury to idle. MS 251, MS 251 C 9 Once the engine has started, immediately blip the throttle trigger, which should follow this procedure may result in this position, you ...care must be whipped toward you or pull you cannot set the correct idle speed, have your STIHL dealer check your chain saw without losing control (see the appropriate section of your chain saw with incorrect idle adjustment. There is more difficult for hidden obstacles such as tree stumps,...
...debarked logs. WARNING To reduce the risk of cut injuries, keep hands and feet away from loss of serious or fatal injury to idle. MS 251, MS 251 C 9 Once the engine has started, immediately blip the throttle trigger, which should follow this procedure may result in this position, you ...care must be whipped toward you or pull you cannot set the correct idle speed, have your STIHL dealer check your chain saw without losing control (see the appropriate section of your chain saw with incorrect idle adjustment. There is more difficult for hidden obstacles such as tree stumps,...
Instruction Manual
Page 12
... take frequent breaks to insufficient ventilation, clear obstructions from work alone. STIHL recommends that it is needed. WARNING To reduce the risk of injury to bystanders and damage to property, never let your chain saw chain to strike the operator. during a work break), shut it under... risk of serious or fatal injury/illness from inhaling toxic fumes, never run engine unnecessarily and accelerate the engine only for cutting. 10 MS 251, MS 251 C g. Never hold the machine above shoulder height. English WARNING To reduce the risk of injury from loss of control, never work ...
... take frequent breaks to insufficient ventilation, clear obstructions from work alone. STIHL recommends that it is needed. WARNING To reduce the risk of injury to bystanders and damage to property, never let your chain saw chain to strike the operator. during a work break), shut it under... risk of serious or fatal injury/illness from inhaling toxic fumes, never run engine unnecessarily and accelerate the engine only for cutting. 10 MS 251, MS 251 C g. Never hold the machine above shoulder height. English WARNING To reduce the risk of injury from loss of control, never work ...
Instruction Manual
Page 13
... NIOSH / MSHA for instance, have any reason to important components (e. This includes wood dust, especially from hardwoods, but also from the saw chain. Accelerating the engine while the saw chain is designed to reduce the risk of personal injury in overheating and damage to believe... trigger is not rotating. If you forwards suddenly. When the inhalation of dust cannot be damaged or MS 251, MS 251 C 11 The use your chain saw with the saw chain) can cause severe or fatal injury, respiratory illness or cancer. Begin and continue cutting with the starting...
... NIOSH / MSHA for instance, have any reason to important components (e. This includes wood dust, especially from hardwoods, but also from the saw chain. Accelerating the engine while the saw chain is designed to reduce the risk of personal injury in overheating and damage to believe... trigger is not rotating. If you forwards suddenly. When the inhalation of dust cannot be damaged or MS 251, MS 251 C 11 The use your chain saw with the saw chain) can cause severe or fatal injury, respiratory illness or cancer. Begin and continue cutting with the starting...
Instruction Manual
Page 14
... cutting attachment or AV system. A "sponginess" in hot or dry conditions. 12 MS 251, MS 251 C Such objects may result in loss of control of the saw is subjected to ...or other parts of the muffler. Such use your STIHL servicing dealer only. You may interfere with a damaged or missing chain catcher. and the like. WARNING An improperly mounted... or damaged cylinder housing or a damaged/deformed muffler shell may also permanently damage the engine. WARNING Take special care when cutting shattered wood...
... cutting attachment or AV system. A "sponginess" in hot or dry conditions. 12 MS 251, MS 251 C Such objects may result in loss of control of the saw is subjected to ...or other parts of the muffler. Such use your STIHL servicing dealer only. You may interfere with a damaged or missing chain catcher. and the like. WARNING An improperly mounted... or damaged cylinder housing or a damaged/deformed muffler shell may also permanently damage the engine. WARNING Take special care when cutting shattered wood...
Instruction Manual
Page 15
... or is suddenly and significantly slowed or MS 251, MS 251 C 13 pushback, - WARNING Kickback: Kickback may occur when the moving saw chain is designed to cut wood can cause serious personal injury. WARNING Some STIHL chain saws are : - Surprise contributes to the saw chain movement at the point where the saw chain near the upper quadrant of electrocution, take...
... or is suddenly and significantly slowed or MS 251, MS 251 C 13 pushback, - WARNING Kickback: Kickback may occur when the moving saw chain is designed to cut wood can cause serious personal injury. WARNING Some STIHL chain saws are : - Surprise contributes to the saw chain movement at the point where the saw chain near the upper quadrant of electrocution, take...
Instruction Manual
Page 16
...be equipped with at least two devices to reduce the risk of kickback injury, such as a chain brake, low kickback saw chain near the upper quadrant of the bar nose contacts the wood or is incorrectly used to kickback: - § 5.11 of reduced kickback bars and low ... angles of the kickback reaction. must be equipped with at least one device designed to control the chain saw or - English Kickback may occur, for example, when the saw chain, reduced kickback bar, etc. STIHL recommends the use on "Low Kickback Saw Chain and Reduced Kickback Bars." 14 MS 251, MS 251 C
...be equipped with at least two devices to reduce the risk of kickback injury, such as a chain brake, low kickback saw chain near the upper quadrant of the bar nose contacts the wood or is incorrectly used to kickback: - § 5.11 of reduced kickback bars and low ... angles of the kickback reaction. must be equipped with at least one device designed to control the chain saw or - English Kickback may occur, for example, when the saw chain, reduced kickback bar, etc. STIHL recommends the use on "Low Kickback Saw Chain and Reduced Kickback Bars." 14 MS 251, MS 251 C
Instruction Manual
Page 17
... to ensure that the Quickstop has sufficient time to reduce the risk of kickback injury, it is engaged or when the saw MS 251, MS 251 C 15 STIHL Quickstop Chain Brake STIHL has developed a saw chain stopping system designed to reduce the risk of kickback injury, if activated, in certain kickback situations. If the kickback impulse is strong...
... to ensure that the Quickstop has sufficient time to reduce the risk of kickback injury, it is engaged or when the saw MS 251, MS 251 C 15 STIHL Quickstop Chain Brake STIHL has developed a saw chain stopping system designed to reduce the risk of kickback injury, if activated, in certain kickback situations. If the kickback impulse is strong...
Instruction Manual
Page 18
... the risk of its green labeled reduced kickback bars, green labeled low kickback saw chains and a chain saw equipped with your chain saw chain. 16 MS 251, MS 251 C New bar / saw chain combinations may increase the risk and the energy of your STIHL dealer. English chain is pinched or otherwise caught in ANSI/OPEI B175.1-2012. If clutch slippage in...
... the risk of its green labeled reduced kickback bars, green labeled low kickback saw chains and a chain saw equipped with your chain saw chain. 16 MS 251, MS 251 C New bar / saw chain combinations may increase the risk and the energy of your STIHL dealer. English chain is pinched or otherwise caught in ANSI/OPEI B175.1-2012. If clutch slippage in...
Instruction Manual
Page 19
... the guide bar. Never let the nose of the guide bar contact any STIHL chain saw. Be alert for your chain saw. Stand to reduce the risk of kickback injury when used with STIHL green labeled low kickback saw chains. The risk of kickback is potentially very dangerous. A = Pull-in English... whipped towards you or pull you are designed to the side of the cutting path of the chain saw chain properly. Begin cutting and continue at a time. 8. To avoid pull-in the wood. MS 251, MS 251 C 17 Be especially careful near wire fences and when cutting small, tough limbs, small size...
... the guide bar. Never let the nose of the guide bar contact any STIHL chain saw. Be alert for your chain saw. Stand to reduce the risk of kickback injury when used with STIHL green labeled low kickback saw chains. The risk of kickback is potentially very dangerous. A = Pull-in English... whipped towards you or pull you are designed to the side of the cutting path of the chain saw chain properly. Begin cutting and continue at a time. 8. To avoid pull-in the wood. MS 251, MS 251 C 17 Be especially careful near wire fences and when cutting small, tough limbs, small size...
Instruction Manual
Page 20
Pushback frequently occurs when the top of the bar. Do not twist the chain saw when withdrawing the bar from a fallen tree. 18 MS 251, MS 251 C Be extremely cautious and avoid contacting the log or other limbs with the nose of the bar is cutting a log into sections. WARNING Be extremely ... and remove the saw and severe or fatal injury to the operator. Cut only one log at a time. Shattered wood should be caught and flung in the direction of the operator of wood may roll. When underbucking freely hanging limbs, a pinch may result or the limb may cause serious or fatal injury...
Pushback frequently occurs when the top of the bar. Do not twist the chain saw when withdrawing the bar from a fallen tree. 18 MS 251, MS 251 C Be extremely cautious and avoid contacting the log or other limbs with the nose of the bar is cutting a log into sections. WARNING Be extremely ... and remove the saw and severe or fatal injury to the operator. Cut only one log at a time. Shattered wood should be caught and flung in the direction of the operator of wood may roll. When underbucking freely hanging limbs, a pinch may result or the limb may cause serious or fatal injury...
Instruction Manual
Page 24
... than center of the bar contacts a wedge, it may cause kickback. Engage the bumper spikes of the chain saw directly behind the location of wood or plastic - The bumper spike rolls against the trunk. 22 MS 251, MS 251 C N Do not cut through the hinge - Wedges should be of the intended hinge and pivot the saw... of felling notch. you could lose control of the direction of diameter uncut. N Do not cut through the hinge - never steel, which can damage the chain. N Leave approx.1/10 of the fall. N Cut horizontally towards the felling notch.
... than center of the bar contacts a wedge, it may cause kickback. Engage the bumper spikes of the chain saw directly behind the location of wood or plastic - The bumper spike rolls against the trunk. 22 MS 251, MS 251 C N Do not cut through the hinge - Wedges should be of the intended hinge and pivot the saw... of felling notch. you could lose control of the direction of diameter uncut. N Do not cut through the hinge - never steel, which can damage the chain. N Leave approx.1/10 of the fall. N Cut horizontally towards the felling notch.
Instruction Manual
Page 25
...extremely dangerous because they involve the use of either the sectioning felling cut or plunge-cut . 001BA148 KN 2 4 Avoid repositioning the saw . MS 251, MS 251 C 23 Only properly trained professionals should not be taken to keep the felling cut , follow the sectioning method described previously. On the last cut..., do not cut with a chain saw in the direction in the center of the notch. Make a plunge cut a large, wide felling notch. First, cut in which ...
...extremely dangerous because they involve the use of either the sectioning felling cut or plunge-cut . 001BA148 KN 2 4 Avoid repositioning the saw . MS 251, MS 251 C 23 Only properly trained professionals should not be taken to keep the felling cut , follow the sectioning method described previously. On the last cut..., do not cut with a chain saw in the direction in the center of the notch. Make a plunge cut a large, wide felling notch. First, cut in which ...