Instruction Manual
Page 3
... the Chain Sprocket 47 Maintaining and Sharpening the Saw Chain 48 Maintenance and Care 52 Main Parts 54 Specifications 56 Ordering Spare Parts 57 Maintenance and Repairs 57 Disposal 58 STIHL Incorporated Federal Emission Control Warranty Statement 58 Trademarks 60 Allow only persons who fully understand this manual...go to www.stihlusa.com. KG, 2014 0458-737-8621-B. 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.
... the Chain Sprocket 47 Maintaining and Sharpening the Saw Chain 48 Maintenance and Care 52 Main Parts 54 Specifications 56 Ordering Spare Parts 57 Maintenance and Repairs 57 Disposal 58 STIHL Incorporated Federal Emission Control Warranty Statement 58 Trademarks 60 Allow only persons who fully understand this manual...go to www.stihlusa.com. KG, 2014 0458-737-8621-B. 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.
Instruction Manual
Page 5
... WARNING Be alert - If you have different parts and controls. MS 251, MS 251 C 3 Careless or improper use of any work on reactive forces. The saw . Pay special attention to use . All safety precautions that are fatigued. STIHL recommends the use may be strenuous. Do not... , even if the chain is in good physical condition and mental health and not under the influence of genuine STIHL replacement parts. Use your performance requirements. When using it understands the information contained in personal injury or property damage, including damage...
... WARNING Be alert - If you have different parts and controls. MS 251, MS 251 C 3 Careless or improper use of any work on reactive forces. The saw . Pay special attention to use . All safety precautions that are fatigued. STIHL recommends the use may be strenuous. Do not... , even if the chain is in good physical condition and mental health and not under the influence of genuine STIHL replacement parts. Use your performance requirements. When using it understands the information contained in personal injury or property damage, including damage...
Instruction Manual
Page 6
...contribute to whitefinger disease are available on branches, brush or the moving parts of a chain saw (or other power tools) exposing the operator ... will increase cutting time, and pressing a dull saw chain through wood will tend to have higher vibration levels. - Good footing is recommended...before operating this chain saw. WARNING The ignition system of the STIHL unit produces an electromagnetic field of exposure to your hands warm. .... made of serious or fatal injury, persons with nonslip soles. MS 251, MS 251 C Take frequent breaks. To reduce the risk of leather or ...
...contribute to whitefinger disease are available on branches, brush or the moving parts of a chain saw (or other power tools) exposing the operator ... will increase cutting time, and pressing a dull saw chain through wood will tend to have higher vibration levels. - Good footing is recommended...before operating this chain saw. WARNING The ignition system of the STIHL unit produces an electromagnetic field of exposure to your hands warm. .... made of serious or fatal injury, persons with nonslip soles. MS 251, MS 251 C Take frequent breaks. To reduce the risk of leather or ...
Instruction Manual
Page 7
... of the engine can cause the saw . 001BA275 KN MS 251, MS 251 C 5 Chain saw parts see the chapter on "Main Parts." If there is damaged, improperly adjusted or maintained, or not completely or securely assembled. Properly secure your face, STIHL recommends that it is tight (no leaks) and that... the controls and safety devices are useable with STIHL chain saws, their hearing...
... of the engine can cause the saw . 001BA275 KN MS 251, MS 251 C 5 Chain saw parts see the chapter on "Main Parts." If there is damaged, improperly adjusted or maintained, or not completely or securely assembled. Properly secure your face, STIHL recommends that it is tight (no leaks) and that... the controls and safety devices are useable with STIHL chain saws, their hearing...
Instruction Manual
Page 9
...as it will go (approx. 1/4 turn the cap (with the grip up) until it drops fully into the correct position for installation. STIHL Oilomatic saw chain follow the procedure described in the chapter "Mounting the Bar and Chain" of the instruction manual.) WARNING Always check your ... for leaks, especially the visible parts, e.g., filler cap, hose connections, manual fuel pump (only for a while, then switch engine off the engine and then tighten. WARNING Check that the spark plug boot is under the grip and not in line with outer mark. MS 251, MS 251 C 7 Then, twist the cap...
...as it will go (approx. 1/4 turn the cap (with the grip up) until it drops fully into the correct position for installation. STIHL Oilomatic saw chain follow the procedure described in the chapter "Mounting the Bar and Chain" of the instruction manual.) WARNING Always check your ... for leaks, especially the visible parts, e.g., filler cap, hose connections, manual fuel pump (only for a while, then switch engine off the engine and then tighten. WARNING Check that the spark plug boot is under the grip and not in line with outer mark. MS 251, MS 251 C 7 Then, twist the cap...
Instruction Manual
Page 11
... procedure may result in injury to prevent the bar and chain from loss of control and / or contact with your hand or any other part of control, never use your hand. It is running cutting tool, do not wrap the starter rope around the handles, keeping the handles...slipping on reactive forces). Special care must be whipped toward you or pull you cannot set the correct idle speed, have your STIHL dealer check your thumb and forefinger. MS 251, MS 251 C 9 Wrap your fingers tightly around your chain saw chain and be taken in slippery conditions (wet ground, snow) and ...
... procedure may result in injury to prevent the bar and chain from loss of control and / or contact with your hand or any other part of control, never use your hand. It is running cutting tool, do not wrap the starter rope around the handles, keeping the handles...slipping on reactive forces). Special care must be whipped toward you or pull you cannot set the correct idle speed, have your STIHL dealer check your thumb and forefinger. MS 251, MS 251 C 9 Wrap your fingers tightly around your chain saw chain and be taken in slippery conditions (wet ground, snow) and ...
Instruction Manual
Page 13
... part of your chain saw down. Use good work practices, such as Western Red Cedar. WARNING Breathing asbestos dust is dangerous and can then increase the risk of injury, e. English WARNING Never touch a saw chain with the bumper spike so that you might be damaged or MS 251, MS 251 ...C 11 WARNING The saw chain continues to move the Master Control Lever to STOP, 0 or †. g. This includes wood dust, especially from hardwoods, but also from some other illnesses. move for more...
... part of your chain saw down. Use good work practices, such as Western Red Cedar. WARNING Breathing asbestos dust is dangerous and can then increase the risk of injury, e. English WARNING Never touch a saw chain with the bumper spike so that you might be damaged or MS 251, MS 251 ...C 11 WARNING The saw chain continues to move the Master Control Lever to STOP, 0 or †. g. This includes wood dust, especially from hardwoods, but also from some other illnesses. move for more...
Instruction Manual
Page 14
...unit with the cooling process of personal injury, do not touch the muffler and other parts of these Safety Precautions. Contact your gas/oil mix ratio is not designed for ... spark plug) become hot during normal operation may be replaced in hot or dry conditions. 12 MS 251, MS 251 C Some state or federal laws or regulations may also permanently damage the engine. g. Never operate ...muffler shell may be replaced, consult your STIHL servicing dealer. To reduce the risk of the muffler. WARNING Take special care when cutting shattered wood because of the risk of injury from ...
...unit with the cooling process of personal injury, do not touch the muffler and other parts of these Safety Precautions. Contact your gas/oil mix ratio is not designed for ... spark plug) become hot during normal operation may be replaced in hot or dry conditions. 12 MS 251, MS 251 C Some state or federal laws or regulations may also permanently damage the engine. g. Never operate ...muffler shell may be replaced, consult your STIHL servicing dealer. To reduce the risk of the muffler. WARNING Take special care when cutting shattered wood because of the risk of injury from ...
Instruction Manual
Page 17
..." at all. These devices are designed to engage the brake even without a front hand guard. manual activation: If a kickback occurs, the chain saw MS 251, MS 251 C 15 In a kickback situation this alone is called a Quickstop chain brake. WARNING Never run the chain saw above idle speed for more than 3...the chain brake is the activation lever for the brake, and pushes it forward. - There are equipped with a Stihl Quickstop chain brake. WARNING No Quickstop or other parts of your left hand contacts the front guard, which is engaged or when the saw moves upwards towards the user in...
..." at all. These devices are designed to engage the brake even without a front hand guard. manual activation: If a kickback occurs, the chain saw MS 251, MS 251 C 15 In a kickback situation this alone is called a Quickstop chain brake. WARNING Never run the chain saw above idle speed for more than 3...the chain brake is the activation lever for the brake, and pushes it forward. - There are equipped with a Stihl Quickstop chain brake. WARNING No Quickstop or other parts of your left hand contacts the front guard, which is engaged or when the saw moves upwards towards the user in...
Instruction Manual
Page 25
.... Cut until the depth of the guide bar and can result in kickback. To make the first part of the guide bar nose to open the cut with the guide bar fanning in the illustration. MS 251, MS 251 C 23 Begin the plunge cut by applying the lower portion of the felling cut . Seek the...
.... Cut until the depth of the guide bar and can result in kickback. To make the first part of the guide bar nose to open the cut with the guide bar fanning in the illustration. MS 251, MS 251 C 23 Begin the plunge cut by applying the lower portion of the felling cut . Seek the...
Instruction Manual
Page 26
...REPAIR AND STORING Maintenance, replacement, or repair of the emission control devices and systems may be performed by your STIHL servicing dealer only. Use of non-STIHL parts may have similar requirements. WARNING Do not attempt any nonroad engine repair establishment or individual. Always press spark ...a brush or forest fire is maintained in this product is responsible for the laws or regulations relating to fire protection requirements. 24 MS 251, MS 251 C The owner/operator of this manual. Forest Service, may cause serious or fatal injury. Always keep to the side of fire ...
...REPAIR AND STORING Maintenance, replacement, or repair of the emission control devices and systems may be performed by your STIHL servicing dealer only. Use of non-STIHL parts may have similar requirements. WARNING Do not attempt any nonroad engine repair establishment or individual. Always press spark ...a brush or forest fire is maintained in this product is responsible for the laws or regulations relating to fire protection requirements. 24 MS 251, MS 251 C The owner/operator of this manual. Forest Service, may cause serious or fatal injury. Always keep to the side of fire ...
Instruction Manual
Page 27
... Machine" in a dry place and away from children. Before storing for periodic inspection and servicing of the band on the wood. MS 251, MS 251 C 25 replace worn sprockets or chains. Like an automobile brake, a chain saw chain brake incurs wear each STIHL chain saw should also be returned immediately for the chain brake on your... - The drive link gauge (2) of the saw chain, guide bar and chain sprocket. Excessive wear will vary depending upon usage, conditions under which may damage parts of the guide bar (3).
... Machine" in a dry place and away from children. Before storing for periodic inspection and servicing of the band on the wood. MS 251, MS 251 C 25 replace worn sprockets or chains. Like an automobile brake, a chain saw chain brake incurs wear each STIHL chain saw should also be returned immediately for the chain brake on your... - The drive link gauge (2) of the saw chain, guide bar and chain sprocket. Excessive wear will vary depending upon usage, conditions under which may damage parts of the guide bar (3).
Instruction Manual
Page 34
Filler cap is aligned with the exterior marking. 001BA238 KN 32 MS 251, MS 251 C markings on filler cap and housing will align. 1 001BA234 KN 001BA235 KN Handle is in an upright position: N Position filler cap - interior marking (1) is now ... tank - English 001BA241 KN 001BA233 KN 001BA237 KN N Remove the filler cap. If the filler cap will go. Refueling Take care not to the upper part. Closing N Push the filler cap down . N Flip the handle down and twist it clockwise until it will not engage into the tank housing 001BA231 KN...
Filler cap is aligned with the exterior marking. 001BA238 KN 32 MS 251, MS 251 C markings on filler cap and housing will align. 1 001BA234 KN 001BA235 KN Handle is in an upright position: N Position filler cap - interior marking (1) is now ... tank - English 001BA241 KN 001BA233 KN 001BA237 KN N Remove the filler cap. If the filler cap will go. Refueling Take care not to the upper part. Closing N Push the filler cap down . N Flip the handle down and twist it clockwise until it will not engage into the tank housing 001BA231 KN...
Instruction Manual
Page 37
... High revs with its opening facing the chain saw - even if your STIHL servicing dealer, at idle speed, engage the chain brake (push hand guard ...brake Winter Operation English Before starting cutting work : Run engine at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12 months N Use a screwdriver to...dirt and move freely. this rule is designed to this helps prevent carburetor icing. 2310BA001 KN MS 251, MS 251 C 35 Releasing the chain brake felling cut. The chain brake will quickly damage the powerhead and...
... High revs with its opening facing the chain saw - even if your STIHL servicing dealer, at idle speed, engage the chain brake (push hand guard ...brake Winter Operation English Before starting cutting work : Run engine at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12 months N Use a screwdriver to...dirt and move freely. this rule is designed to this helps prevent carburetor icing. 2310BA001 KN MS 251, MS 251 C 35 Releasing the chain brake felling cut. The chain brake will quickly damage the powerhead and...
Instruction Manual
Page 42
... see "Spark Plug". N Dry the spark plug. N Refit the spark plug - Check chain tension frequently A new saw chain must be run at part throttle. N Remove the spark plug - During work NOTICE Do not make the mixture leaner to the starting throttle position (n) - High revs with the ... brake engaged (chain locked) will quickly damage the clutch and chain brake. even if the engine is off load) for an extended period. 40 MS 251, MS 251 C N Now start the engine. N Allow engine to the stop position (0). Shutting Off the Engine N Move the Master Control lever to warm ...
... see "Spark Plug". N Dry the spark plug. N Refit the spark plug - Check chain tension frequently A new saw chain must be run at part throttle. N Remove the spark plug - During work NOTICE Do not make the mixture leaner to the starting throttle position (n) - High revs with the ... brake engaged (chain locked) will quickly damage the clutch and chain brake. even if the engine is off load) for an extended period. 40 MS 251, MS 251 C N Now start the engine. N Allow engine to the stop position (0). Shutting Off the Engine N Move the Master Control lever to warm ...
Instruction Manual
Page 45
rinse the filter from around the filter NOTICE Do not use high-pressure cleaners N Dry all filter parts - N Turn air filter 1/4 turn it clear with compressed air from the inside to extreme heat N Do not oil the filter N Reinstall ...to out under a water jet - do not use tools to a thorough cleaning. the "STIHL" logo must be damaged in STIHL specialpurpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e. g., warm soapy water) - see "Shroud" MS 251, MS 251 C 43 Cleaning the Air Filter If there is a noticeable loss of any major hardware. 2710BA000...
rinse the filter from around the filter NOTICE Do not use high-pressure cleaners N Dry all filter parts - N Turn air filter 1/4 turn it clear with compressed air from the inside to extreme heat N Do not oil the filter N Reinstall ...to out under a water jet - do not use tools to a thorough cleaning. the "STIHL" logo must be damaged in STIHL specialpurpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e. g., warm soapy water) - see "Shroud" MS 251, MS 251 C 43 Cleaning the Air Filter If there is a noticeable loss of any major hardware. 2710BA000...
Instruction Manual
Page 47
... fuel mix (too much oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. unfavorable running conditions (mostly at part load. 2310BA006 KN N Pull off the spark plug boot N Unscrew spark plug MS 251, MS 251 C 45 Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded.
... fuel mix (too much oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. unfavorable running conditions (mostly at part load. 2310BA006 KN N Pull off the spark plug boot N Unscrew spark plug MS 251, MS 251 C 45 Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded.
Instruction Manual
Page 50
...dull or damaged saw chain - N Clean the saw chain N Check the saw chain cuts through wood effortlessly even with very little pushing. this leads to the remaining parts in the area of the depth gauge of wear - risk of the chain saw chains are ...Carbide-tipped (Duro) saw - For an optimal sharpening result, STIHL recommends STIHL servicing dealers. WARNING Compliance with the angles and dimensions listed below is embossed in terms of shape and level of each cutter. can lead to be maintained during resharpening. 48 MS 251, MS 251 C Marking (a) 7 1 or 1/4 6, P or PM...
...dull or damaged saw chain - N Clean the saw chain N Check the saw chain cuts through wood effortlessly even with very little pushing. this leads to the remaining parts in the area of the depth gauge of wear - risk of the chain saw chains are ...Carbide-tipped (Duro) saw - For an optimal sharpening result, STIHL recommends STIHL servicing dealers. WARNING Compliance with the angles and dimensions listed below is embossed in terms of shape and level of each cutter. can lead to be maintained during resharpening. 48 MS 251, MS 251 C Marking (a) 7 1 or 1/4 6, P or PM...
Instruction Manual
Page 52
N All cutters must be filed; upper part of the humped drive link (2) (with file gauge All ... 689BA051 KN 689BA044 KN 689BA061 KN a The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness. 689BA023 KN N Lay the appropriate file gauge (1) for the chain pitch on...drive link must be checked - ideally, one should have this , be careful not to kick back. WARNING The rest of the depth gauge 50 MS 251, MS 251 C English markings on the forward stroke - Chain pitch Inches 1/4 P 1/4 3/8 P 0.325 3/8 0.404 (mm) (6.35) (6.35) (9.32...
N All cutters must be filed; upper part of the humped drive link (2) (with file gauge All ... 689BA051 KN 689BA044 KN 689BA061 KN a The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness. 689BA023 KN N Lay the appropriate file gauge (1) for the chain pitch on...drive link must be checked - ideally, one should have this , be careful not to kick back. WARNING The rest of the depth gauge 50 MS 251, MS 251 C English markings on the forward stroke - Chain pitch Inches 1/4 P 1/4 3/8 P 0.325 3/8 0.404 (mm) (6.35) (6.35) (9.32...
Instruction Manual
Page 53
... saw chain thoroughly N In the event of extended periods of file holder with the file gauge File holder File gauge Inches (mm) mm (Inches) Part number Part number Part number 1/4 P (6.35) 3.2 (1/8) 5605 771 3206 5605 750 4300 0000 893 4005 1/4 (6.35) 4.0 (5/32) 5605 772 4006 5605 750 4327 1110 893 4000 3/8 P (9.32... file and file gauge Taper square file Sharpening set 1) Part number 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 Part number 5605 007 1000 5605 007 1027 5605 007 1027 5605 007 1028 5605 007 1029 5605 007 1030 MS 251, MS 251 C 51
... saw chain thoroughly N In the event of extended periods of file holder with the file gauge File holder File gauge Inches (mm) mm (Inches) Part number Part number Part number 1/4 P (6.35) 3.2 (1/8) 5605 771 3206 5605 750 4300 0000 893 4005 1/4 (6.35) 4.0 (5/32) 5605 772 4006 5605 750 4327 1110 893 4000 3/8 P (9.32... file and file gauge Taper square file Sharpening set 1) Part number 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 Part number 5605 007 1000 5605 007 1027 5605 007 1027 5605 007 1028 5605 007 1029 5605 007 1030 MS 251, MS 251 C 51