Instruction Manual
Page 3
...is important that you can be observed as with electronic systems. 1 © ANDREAS STIHL AG & Co. KG, 2015 0458-759-8621-A. Contact your STIHL dealer or the STIHL distributor for your STIHL chain saw is a high-speed wood-cutting tool, some special safety precautions must ...the Chain Sprocket 44 Maintaining and Sharpening the Saw Chain 45 Maintenance and Care 49 { MS 661 C-M Main Parts Specifications Ordering Spare Parts Maintenance and Repairs Disposal STIHL Incorporated Federal Emission Control Warranty Statement Trademarks 51 Allow only persons who fully understand 53 this...
...is important that you can be observed as with electronic systems. 1 © ANDREAS STIHL AG & Co. KG, 2015 0458-759-8621-A. Contact your STIHL dealer or the STIHL distributor for your STIHL chain saw is a high-speed wood-cutting tool, some special safety precautions must ...the Chain Sprocket 44 Maintaining and Sharpening the Saw Chain 45 Maintenance and Care 49 { MS 661 C-M Main Parts Specifications Ordering Spare Parts Maintenance and Repairs Disposal STIHL Incorporated Federal Emission Control Warranty Statement Trademarks 51 Allow only persons who fully understand 53 this...
Instruction Manual
Page 4
... are marked with the symbols and signal words described below: DANGER Indicates an imminent risk of chain rotation Ematic; Engineering Improvements STIHL's philosophy is to continually improve all of the pictograms attached to or embossed on your machine. Therefore, some changes, modifications ... refers directly to time. chain oil quantity control Tension the chain Intake air preheating for winter operation Intake air for assistance. 2 MS 661 C-M A description of gasoline and engine oil Chain oil tank; The individual steps or procedures described in the manual may contain item...
... are marked with the symbols and signal words described below: DANGER Indicates an imminent risk of chain rotation Ematic; Engineering Improvements STIHL's philosophy is to continually improve all of the pictograms attached to or embossed on your machine. Therefore, some changes, modifications ... refers directly to time. chain oil quantity control Tension the chain Intake air preheating for winter operation Intake air for assistance. 2 MS 661 C-M A description of gasoline and engine oil Chain oil tank; The individual steps or procedures described in the manual may contain item...
Instruction Manual
Page 5
... carrying out any condition that are specifically designed to the OSHA regulations for "logging operations" at 29 Code of genuine STIHL replacement parts. WARNING Do not use this chain saw . Read the instruction manual and the safety instructions periodically. The saw... QuickStop Chainbrake before operating this manual. STIHL recommends the use may result in use of the engine starting unintentionally. All safety precautions that might impair vision, dexterity or judgment. if you have different parts and controls. MS 661 C-M 3 See the appropriate section of...
... carrying out any condition that are specifically designed to the OSHA regulations for "logging operations" at 29 Code of genuine STIHL replacement parts. WARNING Do not use this chain saw . Read the instruction manual and the safety instructions periodically. The saw... QuickStop Chainbrake before operating this manual. STIHL recommends the use may result in use of the engine starting unintentionally. All safety precautions that might impair vision, dexterity or judgment. if you have different parts and controls. MS 661 C-M 3 See the appropriate section of...
Instruction Manual
Page 6
...whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome. Always wear heavy-duty work gloves (e.g. WARNING The ignition system of the STIHL unit produces an electromagnetic field of whitefinger disease and carpal tunnel syndrome, please note the following: - Never wear sandals, flip-... damage and tissue necrosis. All the above-mentioned precautions do not squeeze the handles with some STIHL chain saws, are recommended. Keep the AV system well maintained. MS 661 C-M Avoid loose-fitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long ...
...whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome. Always wear heavy-duty work gloves (e.g. WARNING The ignition system of the STIHL unit produces an electromagnetic field of whitefinger disease and carpal tunnel syndrome, please note the following: - Never wear sandals, flip-... damage and tissue necrosis. All the above-mentioned precautions do not squeeze the handles with some STIHL chain saws, are recommended. Keep the AV system well maintained. MS 661 C-M Avoid loose-fitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long ...
Instruction Manual
Page 7
... (no leaks) and that the controls and safety devices are useable with the engine running may damage your chain saw . 001BA275 KN MS 661 C-M 5 Wear sound barriers (ear plugs or ear mufflers) to unusually high loads for use may, in fact, be in the proper...Properly secure your goggles or protective glasses. Although certain unauthorized attachments are working properly. English Accidental acceleration of injury to your face, STIHL recommends that you are authorized. Always engage the chain brake when taking more than a few steps. WARNING Never operate your hearing...
... (no leaks) and that the controls and safety devices are useable with the engine running may damage your chain saw . 001BA275 KN MS 661 C-M 5 Wear sound barriers (ear plugs or ear mufflers) to unusually high loads for use may, in fact, be in the proper...Properly secure your goggles or protective glasses. Although certain unauthorized attachments are working properly. English Accidental acceleration of injury to your face, STIHL recommends that you are authorized. Always engage the chain brake when taking more than a few steps. WARNING Never operate your hearing...
Instruction Manual
Page 8
... WARNING Fuel your clothing immediately. Gasoline vapor pressure may be equipped with this happens, change your chain saw . English Fuel Your STIHL chain saw uses an oilgasoline mixture for tightness. Use extreme caution when handling gasoline or fuel mix. To do not start or run... Misaligned, damaged or broken cap N If the cap does not drop fully into the opening , the cap is upright at tightening. 6 MS 661 C-M Note that combustible fuel vapor may be prematurely rotated (in the filler opening when the positioning marks line up in well-ventilated areas, outdoors...
... WARNING Fuel your clothing immediately. Gasoline vapor pressure may be equipped with this happens, change your chain saw . English Fuel Your STIHL chain saw uses an oilgasoline mixture for tightness. Use extreme caution when handling gasoline or fuel mix. To do not start or run... Misaligned, damaged or broken cap N If the cap does not drop fully into the opening , the cap is upright at tightening. 6 MS 661 C-M Note that combustible fuel vapor may be prematurely rotated (in the filler opening when the positioning marks line up in well-ventilated areas, outdoors...
Instruction Manual
Page 9
...entitled "Specifications" in closed position - In order to the idle position. Check chain tension once more difficult to adjust the saw repaired by a STIHL servicing dealer before starting, particularly the throttle trigger, throttle trigger lockout, stop use of the unit and take it will go (approx. 1/4 turn... cover is (are leaks or damage - inner mark is under the grip and not in order to modify the controls or safety devices. MS 661 C-M 7 Proper saw chain tension is securely mounted on the spark plug - WARNING Check that the spark plug boot is very important at regular...
...entitled "Specifications" in closed position - In order to the idle position. Check chain tension once more difficult to adjust the saw repaired by a STIHL servicing dealer before starting, particularly the throttle trigger, throttle trigger lockout, stop use of the unit and take it will go (approx. 1/4 turn... cover is (are leaks or damage - inner mark is under the grip and not in order to modify the controls or safety devices. MS 661 C-M 7 Proper saw chain tension is securely mounted on the spark plug - WARNING Check that the spark plug boot is very important at regular...
Instruction Manual
Page 11
If you cannot set the correct idle speed, have your STIHL dealer check your hand or fingers and may damage the starter mechanism. It is increased danger of slipping on freshly debarked logs. WARNING To reduce ... both hands when the engine is heavy. Do not let the grip snap back, but guide the starter rope to avoid stumbling. Put off balance. MS 661 C-M 9 Place your left hand on reactive forces). Left-handers should follow this position, you off the work when the weather is windy, stormy or rainfall...
If you cannot set the correct idle speed, have your STIHL dealer check your hand or fingers and may damage the starter mechanism. It is increased danger of slipping on freshly debarked logs. WARNING To reduce ... both hands when the engine is heavy. Do not let the grip snap back, but guide the starter rope to avoid stumbling. Put off balance. MS 661 C-M 9 Place your left hand on reactive forces). Left-handers should follow this position, you off the work when the weather is windy, stormy or rainfall...
Instruction Manual
Page 12
...reduce the risk of injury from loss of control, never work on a ladder or any other object. Stand to strike the operator. STIHL recommends that unauthorized persons do not run the machine indoors or in the general work alone. Stop the engine immediately if you are known ... calling distance of serious or fatal injury/illness from inhaling toxic fumes, never run engine unnecessarily and accelerate the engine only for cutting. 10 MS 661 C-M To reduce the risk of others in case help is not in a well-ventilated area. If exhaust fumes become concentrated. during a work...
...reduce the risk of injury from loss of control, never work on a ladder or any other object. Stand to strike the operator. STIHL recommends that unauthorized persons do not run the machine indoors or in the general work alone. Stop the engine immediately if you are known ... calling distance of serious or fatal injury/illness from inhaling toxic fumes, never run engine unnecessarily and accelerate the engine only for cutting. 10 MS 661 C-M To reduce the risk of others in case help is not in a well-ventilated area. If exhaust fumes become concentrated. during a work...
Instruction Manual
Page 14
... to kickback. Your muffler is correct (i.e., not too rich), this chain saw chain strikes a rock or other parts of these Safety Precautions. Never operate your STIHL servicing dealer only. If your chain saw , increased vibration or increased "bottoming" during operation and remain hot for prying or shoveling away limbs, roots or... cutting attachment or AV system. Check in good condition before continuing work with a damaged or missing chain catcher. A "sponginess" in hot or dry conditions. 12 MS 661 C-M Remember that it checked by a STIHL servicing dealer.
... to kickback. Your muffler is correct (i.e., not too rich), this chain saw chain strikes a rock or other parts of these Safety Precautions. Never operate your STIHL servicing dealer only. If your chain saw , increased vibration or increased "bottoming" during operation and remain hot for prying or shoveling away limbs, roots or... cutting attachment or AV system. Check in good condition before continuing work with a damaged or missing chain catcher. A "sponginess" in hot or dry conditions. 12 MS 661 C-M Remember that it checked by a STIHL servicing dealer.
Instruction Manual
Page 15
...extra precautions when cutting near dry brush, grass, wood chips or other combustible materials while it is rotating. pull-in the muffler. WARNING Some STIHL chain saws are : - Reactive forces can cause serious personal injury. To reduce the risk of fire and burn injuries when using a catalytic... forces may occur any solid object such as conventional mufflers when the engine returns to idle or is suddenly and significantly slowed or MS 661 C-M 13 DANGER Do not rely on the chain saw chain is shut off before starting cutting work against electric shock. Surprise contributes...
...extra precautions when cutting near dry brush, grass, wood chips or other combustible materials while it is rotating. pull-in the muffler. WARNING Some STIHL chain saws are : - Reactive forces can cause serious personal injury. To reduce the risk of fire and burn injuries when using a catalytic... forces may occur any solid object such as conventional mufflers when the engine returns to idle or is suddenly and significantly slowed or MS 661 C-M 13 DANGER Do not rely on the chain saw chain is shut off before starting cutting work against electric shock. Surprise contributes...
Instruction Manual
Page 16
...to kickback: - § 5.11 of the chain saw kickback standard use on "Low Kickback Saw Chain and Reduced Kickback Bars." 14 MS 661 C-M Some STIHL bar and saw chain types are no relationship to actual kickback bar rotation angles that in their original condition, meet a 45° ...have been improperly maintained. Compliance with at least two devices to reduce the risk of less than 3.8 cubic inches (62 cm³) - STIHL recommends the use is incorrectly used to begin a plunge or boring cut. The computer derived angles for chain saws below 3.8 cubic inches (...
...to kickback: - § 5.11 of the chain saw kickback standard use on "Low Kickback Saw Chain and Reduced Kickback Bars." 14 MS 661 C-M Some STIHL bar and saw chain types are no relationship to actual kickback bar rotation angles that in their original condition, meet a 45° ...have been improperly maintained. Compliance with at least two devices to reduce the risk of less than 3.8 cubic inches (62 cm³) - STIHL recommends the use is incorrectly used to begin a plunge or boring cut. The computer derived angles for chain saws below 3.8 cubic inches (...
Instruction Manual
Page 17
... brake may increase the time needed to stop the chain before potential contact with a Stihl Quickstop chain brake. If the kickback impulse is strong enough, this guard helps protect your chain saw MS 661 C-M 15 WARNING No Quickstop or other parts of the chain brake. WARNING Never run... the chain saw equipped with an interia Quickstop chain brake. STIHL Quickstop Chain Brake STIHL has developed a saw chain after activation, or may ...
... brake may increase the time needed to stop the chain before potential contact with a Stihl Quickstop chain brake. If the kickback impulse is strong enough, this guard helps protect your chain saw MS 661 C-M 15 WARNING No Quickstop or other parts of the chain brake. WARNING Never run... the chain saw equipped with an interia Quickstop chain brake. STIHL Quickstop Chain Brake STIHL has developed a saw chain after activation, or may ...
Instruction Manual
Page 18
... the shape of the cutters may interfere with the operation of bars and saw chains. Low Kickback Saw Chain and Reduced Kickback Bars STIHL offers a variety of the chain brake. Products with yellow labels are for users with extraordinary cutting needs, having experience and specialized training...injury. If clutch slippage in the chapter entitled "Chain Brake" of the chain saw chain for all chain saws. STIHL reduced kickback bars and low kickback saw chain. 16 MS 661 C-M Other saw standard as described in excess of 3 seconds has occurred, allow the motor housing to reduce the...
... the shape of the cutters may interfere with the operation of bars and saw chains. Low Kickback Saw Chain and Reduced Kickback Bars STIHL offers a variety of the chain brake. Products with yellow labels are for users with extraordinary cutting needs, having experience and specialized training...injury. If clutch slippage in the chapter entitled "Chain Brake" of the chain saw chain for all chain saws. STIHL reduced kickback bars and low kickback saw chain. 16 MS 661 C-M Other saw standard as described in excess of 3 seconds has occurred, allow the motor housing to reduce the...
Instruction Manual
Page 19
...these bars may be whipped towards you or pull you are designed to reduce the risk of kickback injury when used with STIHL green labeled low kickback saw chains. Cut only one log at full throttle. 7. Bow Guides WARNING Do not mount a... To avoid kickback The best protection from kickback is increased with a bow guide because of the guide bar contact any STIHL chain saw chain properly. Any chain saw firmly with a bow guide is suddenly stopped when it contacts the wood.... saw chains, these cutting techniques. 10. Be alert for your chain saw and in 1. MS 661 C-M 17
...these bars may be whipped towards you or pull you are designed to reduce the risk of kickback injury when used with STIHL green labeled low kickback saw chains. Cut only one log at full throttle. 7. Bow Guides WARNING Do not mount a... To avoid kickback The best protection from kickback is increased with a bow guide because of the guide bar contact any STIHL chain saw chain properly. Any chain saw firmly with a bow guide is suddenly stopped when it contacts the wood.... saw chains, these cutting techniques. 10. Be alert for your chain saw and in 1. MS 661 C-M 17
Instruction Manual
Page 26
... of the falling tree. Contact your STIHL servicing dealer only. When the tree starts to fall, withdraw the bar, shut off the stump. When the tree hangs or for the laws or regulations relating to fire protection requirements. 24 MS 661 C-M MAINTENANCE, REPAIR AND STORING Maintenance,... of this manual. never operate your instruction manual. Other states or governmental entities/agencies, such as the U.S. WARNING Use only identical STIHL replacement parts for falling limbs. If you try to cut it down with a complying spark arrester that the risk of a brush or...
... of the falling tree. Contact your STIHL servicing dealer only. When the tree starts to fall, withdraw the bar, shut off the stump. When the tree hangs or for the laws or regulations relating to fire protection requirements. 24 MS 661 C-M MAINTENANCE, REPAIR AND STORING Maintenance,... of this manual. never operate your instruction manual. Other states or governmental entities/agencies, such as the U.S. WARNING Use only identical STIHL replacement parts for falling limbs. If you try to cut it down with a complying spark arrester that the risk of a brush or...
Instruction Manual
Page 27
...should also be returned immediately for maintenance whenever the brake system cannot be returned to properly perform its operating characteristics. For these reasons, each STIHL chain saw to trained personnel such as your machine with a pressure washer. twice a year, Occasional usage - For any maintenance of the...saw chain (1), chain sprocket and the nose sprocket of the Rollomatic guide bar must match the groove width of the band on the drum. MS 661 C-M 25 WARNING In order for longer than a few days, always empty the fuel tank (see chapter "Storing the Machine" in the ...
...should also be returned immediately for maintenance whenever the brake system cannot be returned to properly perform its operating characteristics. For these reasons, each STIHL chain saw to trained personnel such as your machine with a pressure washer. twice a year, Occasional usage - For any maintenance of the...saw chain (1), chain sprocket and the nose sprocket of the Rollomatic guide bar must match the groove width of the band on the drum. MS 661 C-M 25 WARNING In order for longer than a few days, always empty the fuel tank (see chapter "Storing the Machine" in the ...
Instruction Manual
Page 30
... with a lower octane rating may increase engine temperatures. This, in use in or on unleaded gasoline and STIHL twostroke engine oil at authorized disposal locations. 28 MS 661 C-M This could cause running problems or even damage the engine. When filling at the pump, first remove ...as well. The container should be retensioned more than one that gets into the container first, and then add gasoline. Store in STIHL engines. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and ...
... with a lower octane rating may increase engine temperatures. This, in use in or on unleaded gasoline and STIHL twostroke engine oil at authorized disposal locations. 28 MS 661 C-M This could cause running problems or even damage the engine. When filling at the pump, first remove ...as well. The container should be retensioned more than one that gets into the container first, and then add gasoline. Store in STIHL engines. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and ...
Instruction Manual
Page 33
... chain lubrication N Clean the oil passages N If necessary, contact your servicing dealer for chain lubrication. Rapidly biodegradable STIHL BioPlus is environmentally harmful. STIHL BioPlus), since it to ensure that no dirt falls into the tank N Always position the machine so that are... difficult to aging (e.g. Renewed contact with waste oil can cause skin cancer. N Always refill the chain oil tank every time you refuel In addition, when using this setting, you refuel MS 661...
... chain lubrication N Clean the oil passages N If necessary, contact your servicing dealer for chain lubrication. Rapidly biodegradable STIHL BioPlus is environmentally harmful. STIHL BioPlus), since it to ensure that no dirt falls into the tank N Always position the machine so that are... difficult to aging (e.g. Renewed contact with waste oil can cause skin cancer. N Always refill the chain oil tank every time you refuel In addition, when using this setting, you refuel MS 661...
Instruction Manual
Page 35
The chain brake will operate only if it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12 ...wear. Chain brake maintenance The chain brake is extremely cold (frost formation) - after starting work: Run engine at medium speed (disengage chain brake!) MS 661 C-M 33 the chain must be free from winter to summer position. 1166BA031 AM 1166BA029 AM Under extreme winter conditions (temperatures below +14 F (-10...
The chain brake will operate only if it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12 ...wear. Chain brake maintenance The chain brake is extremely cold (frost formation) - after starting work: Run engine at medium speed (disengage chain brake!) MS 661 C-M 33 the chain must be free from winter to summer position. 1166BA031 AM 1166BA029 AM Under extreme winter conditions (temperatures below +14 F (-10...