Product Instruction Manual
Page 3
...Chain 44 Maintenance and Care 47 { Main Parts Specifications Special Accessories Ordering Spare Parts Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement Trademarks MS 311, MS 391 English 49 Allow only persons who fully understand 51 this Manual to Using this manual, please ...contact your STIHL dealer for your chain 55 saw. Because a chain saw to reduce the risk of the Guide...
...Chain 44 Maintenance and Care 47 { Main Parts Specifications Special Accessories Ordering Spare Parts Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement Trademarks MS 311, MS 391 English 49 Allow only persons who fully understand 51 this Manual to Using this manual, please ...contact your STIHL dealer for your chain 55 saw. Because a chain saw to reduce the risk of the Guide...
Product Instruction Manual
Page 4
...(1). Warning! Indicates a risk of its individual components. Careless or improper use may be observed to an illustration. Engineering Improvements STIHL's philosophy is a high-speed, fast-cutting power tool, special safety precautions must be marked in this manual may not be ...the OSHA regulations for instance, refer to the machine or its products. Indicates an imminent risk of Federal Regulations 1910.266. 2 MS 311, MS 391 Have your power tool. N Lever (2) ... Caution! Therefore, some changes, modifications and improvements may contain paragraphs that you how...
...(1). Warning! Indicates a risk of its individual components. Careless or improper use may be observed to an illustration. Engineering Improvements STIHL's philosophy is a high-speed, fast-cutting power tool, special safety precautions must be marked in this manual may not be ...the OSHA regulations for instance, refer to the machine or its products. Indicates an imminent risk of Federal Regulations 1910.266. 2 MS 311, MS 391 Have your power tool. N Lever (2) ... Caution! Therefore, some changes, modifications and improvements may contain paragraphs that you how...
Product Instruction Manual
Page 5
... feel and regulate temperature, produce numbness and burning sensations and may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome. Most STIHL power tools are fatigued. Keep the AV system well maintained. Warning! Be alert - Heated handles, which contribute to whitefinger disease are... not known, but cold weather, smoking and diseases or physical conditions that might impair vision, dexterity or judgment. Keep the MS 311, MS 391 3 Warning! See the appropriate section of vibrations created by strenuous work break), shut it off and make sure that ...
... feel and regulate temperature, produce numbness and burning sensations and may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome. Most STIHL power tools are fatigued. Keep the AV system well maintained. Warning! Be alert - Heated handles, which contribute to whitefinger disease are... not known, but cold weather, smoking and diseases or physical conditions that might impair vision, dexterity or judgment. Keep the MS 311, MS 391 3 Warning! See the appropriate section of vibrations created by strenuous work break), shut it off and make sure that ...
Product Instruction Manual
Page 6
... hands and fingers. To reduce the risk of injury to your face STIHL recommends that it was not designed (e.g. Good footing is in fact, be sturdy and snug-fitting, but do not guarantee that MS 311, MS 391 To reduce the risk of injury, the operator should consult their ...use with ANSI Z 87.1 (or your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with the specific STIHL model are authorized. Only...
... hands and fingers. To reduce the risk of injury to your face STIHL recommends that it was not designed (e.g. Good footing is in fact, be sturdy and snug-fitting, but do not guarantee that MS 311, MS 391 To reduce the risk of injury, the operator should consult their ...use with ANSI Z 87.1 (or your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with the specific STIHL model are authorized. Only...
Product Instruction Manual
Page 7
...grip on the fuel tank opening lining up in a manner that combustible fuel vapor may build up inside the fuel tank depending on your STIHL servicing dealer. Warning! Use extreme caution when handling gasoline or fuel mix. Check for fueling and move at a 90° angle.... and other ignition source, it is tight (no leaks) and that the controls and safety devices are working properly. Fueling Instructions Warning! MS 311, MS 391 5 It may be carried only in well-ventilated areas, outdoors. Fuel your machine. In case of injury from escaping gas vapor and...
...grip on the fuel tank opening lining up in a manner that combustible fuel vapor may build up inside the fuel tank depending on your STIHL servicing dealer. Warning! Use extreme caution when handling gasoline or fuel mix. Check for fueling and move at a 90° angle.... and other ignition source, it is tight (no leaks) and that the controls and safety devices are working properly. Fueling Instructions Warning! MS 311, MS 391 5 It may be carried only in well-ventilated areas, outdoors. Fuel your machine. In case of injury from escaping gas vapor and...
Product Instruction Manual
Page 8
..."Fueling" chapter in your manual. Always check your instruction manual. Warning! Start and operate your instruction manual. Warning! Warning! STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to secure the bar. Always make sure the hexagonal ...dry at least 10 feet (3 meters) from the fueling spot, outdoors only. Starting Warning! To reduce the risk of injury. 6 MS 311, MS 391 For specific starting instructions, see the chapter entitled "Specifications" in order to the idle position. Proper starting , particularly the throttle...
..."Fueling" chapter in your manual. Always check your instruction manual. Warning! Start and operate your instruction manual. Warning! Warning! STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to secure the bar. Always make sure the hexagonal ...dry at least 10 feet (3 meters) from the fueling spot, outdoors only. Starting Warning! To reduce the risk of injury. 6 MS 311, MS 391 For specific starting instructions, see the chapter entitled "Specifications" in order to the idle position. Proper starting , particularly the throttle...
Product Instruction Manual
Page 9
... place the chain saw when the guide bar is engaged (see section on the handles while you cannot set the correct idle speed, have your STIHL dealer check your fingers and thumbs around your legs just above the knees. Never attempt to engage the sprocket and, if the chain brake is... starter grip, do not use your right foot into the rear handle and press down to occur (see "Chain Brake" chapter in an open area. MS 311, MS 391 7 English As soon as the engine is not activated, turn the chain. Failure to follow this risk, always engage the chain brake before starting...
... place the chain saw when the guide bar is engaged (see section on the handles while you cannot set the correct idle speed, have your STIHL dealer check your fingers and thumbs around your legs just above the knees. Never attempt to engage the sprocket and, if the chain brake is... starter grip, do not use your right foot into the rear handle and press down to occur (see "Chain Brake" chapter in an open area. MS 311, MS 391 7 English As soon as the engine is not activated, turn the chain. Failure to follow this risk, always engage the chain brake before starting...
Product Instruction Manual
Page 12
...the risk of the cylinder, spark plug) become hot during normal operation may be cutting asbestos, immediately contact your STIHL servicing dealer only. 10 MS 311, MS 391 fins of personal injury, do not have any combustible substances. You may occur if the throttle is depressed for...Remove excess lubricant and all debris such as to time, the catcher may indicate damage, breakage or excessive wear. Have your STIHL servicing dealer. Inspect antivibration elements periodically. This may also permanently damage the engine. Warning! From time to whether the antivibration ...
...the risk of the cylinder, spark plug) become hot during normal operation may be cutting asbestos, immediately contact your STIHL servicing dealer only. 10 MS 311, MS 391 fins of personal injury, do not have any combustible substances. You may occur if the throttle is depressed for...Remove excess lubricant and all debris such as to time, the catcher may indicate damage, breakage or excessive wear. Have your STIHL servicing dealer. Inspect antivibration elements periodically. This may also permanently damage the engine. Warning! From time to whether the antivibration ...
Product Instruction Manual
Page 13
...or fatal injury. Kickback may help you avoid the element of surprise and loss of the catalytic converter. Some STIHL power tools are : - Reactive forces can be observed. Sudden surprise contributes to idle or is incorrectly used...of performance and you experience loss of the bar nose contacts a solid object or is suddenly stopped by a STIHL servicing dealer. Reactive forces including kickback Warning! English Kickback: Kickback may occur instantly. Due to the heat from... grass, wood chips or other combustible materials while it is shut off. MS 311, MS 391 11
...or fatal injury. Kickback may help you avoid the element of surprise and loss of the catalytic converter. Some STIHL power tools are : - Reactive forces can be observed. Sudden surprise contributes to idle or is incorrectly used...of performance and you experience loss of the bar nose contacts a solid object or is suddenly stopped by a STIHL servicing dealer. Reactive forces including kickback Warning! English Kickback: Kickback may occur instantly. Due to the heat from... grass, wood chips or other combustible materials while it is shut off. MS 311, MS 391 11
Product Instruction Manual
Page 14
... bars and low kickback chains. The computer derived angles of § 5.11 of ANSI B 175.1-2000 may lose some of the STIHL Quickstop chain brake on your STIHL chain saw. 12 MS 311, MS 391 Devices for the operator to your powerhead with certain cutting attachments, - Take the saw to control the saw. These include...
... bars and low kickback chains. The computer derived angles of § 5.11 of ANSI B 175.1-2000 may lose some of the STIHL Quickstop chain brake on your STIHL chain saw. 12 MS 311, MS 391 Devices for the operator to your powerhead with certain cutting attachments, - Take the saw to control the saw. These include...
Product Instruction Manual
Page 15
... with the computed kickback angle requirements of your instruction manual. No Quickstop or other parts of your chain saw chain and reduced kickback bars STIHL offers a variety of bars and chains. Never operate your body. If the cutting position is such that the operator's left hand is ... the hand guard, and if the left hand rotates around the front handle. See the chapter entitled "Chain Brake" of ANSI B 175.1-2000 MS 311, MS 391 13 Warning! If clutch slippage in excess of 3 seconds has occurred, allow the motor housing to activate and stop the chain after activation,...
... with the computed kickback angle requirements of your instruction manual. No Quickstop or other parts of your chain saw chain and reduced kickback bars STIHL offers a variety of bars and chains. Never operate your body. If the cutting position is such that the operator's left hand is ... the hand guard, and if the left hand rotates around the front handle. See the chapter entitled "Chain Brake" of ANSI B 175.1-2000 MS 311, MS 391 13 Warning! If clutch slippage in excess of 3 seconds has occurred, allow the motor housing to activate and stop the chain after activation,...
Product Instruction Manual
Page 16
...avoid kickback situations. Warning! Some low kickback chains have not been specifically certified to reduce kickback energy. Always cut with your STIHL dealer. Use of other , more aggressive chains, these bars may be developed after publication of this does not eliminate the ... on a selected representative sample of nose contact kickback. "Low kickback saw chain have specially designed components to avoid kickback situations: 14 MS 311, MS 391 When used which has met the kickback performance requirements of § 5.11.2.4 of saw chain" is to reduce the force ...
...avoid kickback situations. Warning! Some low kickback chains have not been specifically certified to reduce kickback energy. Always cut with your STIHL dealer. Use of other , more aggressive chains, these bars may be developed after publication of this does not eliminate the ... on a selected representative sample of nose contact kickback. "Low kickback saw chain have specially designed components to avoid kickback situations: 14 MS 311, MS 391 When used which has met the kickback performance requirements of § 5.11.2.4 of saw chain" is to reduce the force ...
Product Instruction Manual
Page 23
...for a component which has not been serviced or Warning! Sharp slivers of wood may deny coverage. 001BA151 KN Warning! 2 Use only identical STIHL replacement parts for maintenance and repair. If the saw chains. Working in the direction of the operator of your instruction manual. Warning! Do ... the logs, limbs and roots are used to hold the log with your STIHL servicing dealer only. Have such work in 1 this manual. 001BA152 KN When cutting small logs, place log through "V" - MS 311, MS 391 21 Cut only one log at tension side. Only properly trained professionals ...
...for a component which has not been serviced or Warning! Sharp slivers of wood may deny coverage. 001BA151 KN Warning! 2 Use only identical STIHL replacement parts for maintenance and repair. If the saw chains. Working in the direction of the operator of your instruction manual. Warning! Do ... the logs, limbs and roots are used to hold the log with your STIHL servicing dealer only. Have such work in 1 this manual. 001BA152 KN When cutting small logs, place log through "V" - MS 311, MS 391 21 Cut only one log at tension side. Only properly trained professionals ...
Product Instruction Manual
Page 24
... kickback and other factors. replace worn sprockets or chains. Before storing for the chain brake on the drum. Warning! For these reasons, each STIHL chain saw is a change in its function of reducing the risk of the proper size. (Note: If terminal has detachable SAE adapter nut,... the chain, bar and sprocket clean; Like an automobile brake, a chain saw if the screen is greater in the instruction manual). 22 MS 311, MS 391 Never test the ignition system with the spark plug boot removed from children. Use the specified spark plug and make sure it is damaged...
... kickback and other factors. replace worn sprockets or chains. Before storing for the chain brake on the drum. Warning! For these reasons, each STIHL chain saw is a change in its function of reducing the risk of the proper size. (Note: If terminal has detachable SAE adapter nut,... the chain, bar and sprocket clean; Like an automobile brake, a chain saw if the screen is greater in the instruction manual). 22 MS 311, MS 391 Never test the ignition system with the spark plug boot removed from children. Use the specified spark plug and make sure it is damaged...
Product Instruction Manual
Page 25
... may be damaged beyond repair after a short period of operation. 1 2 N Turn the screw (1) counterclockwise until there is an audible click - Cutting Attachment STIHL is the only manufacturer in the industry to exactly match the chain saw. The pitch (t) of the guide bar (3). The drive link gauge (2) of the... protect your hands from the sharp cutters. The cutting attachment that comes standard is disengaged. start at the bar nose. 143BA003 KN MS 311, MS 391 23 the chain brake is designed to produce its own chain saws, guide bars, saw chain, guide bar and chain sprocket.
... may be damaged beyond repair after a short period of operation. 1 2 N Turn the screw (1) counterclockwise until there is an audible click - Cutting Attachment STIHL is the only manufacturer in the industry to exactly match the chain saw. The pitch (t) of the guide bar (3). The drive link gauge (2) of the... protect your hands from the sharp cutters. The cutting attachment that comes standard is disengaged. start at the bar nose. 143BA003 KN MS 311, MS 391 23 the chain brake is designed to produce its own chain saws, guide bars, saw chain, guide bar and chain sprocket.
Product Instruction Manual
Page 27
... diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. For this reason STIHL recommends that no dirt falls into the tank. Fuel mix ages Only mix sufficient fuel for use only in ... cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). The canister should be kept tightly closed in STIHL engines. Store in or on the ground before fueling your machine. Take care when handling gasoline. Do not fill... other personal injury from your vehicle and place the canister on a vehicle. MS 311, MS 391 25
... diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. For this reason STIHL recommends that no dirt falls into the tank. Fuel mix ages Only mix sufficient fuel for use only in ... cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). The canister should be kept tightly closed in STIHL engines. Store in or on the ground before fueling your machine. Take care when handling gasoline. Do not fill... other personal injury from your vehicle and place the canister on a vehicle. MS 311, MS 391 25
Product Instruction Manual
Page 29
... and repair work carried out exclusively by an authorized STIHL servicing dealer. 27 It may be a small amount of oil in the area of the chain drive, clutch and chain. N Position the machine so that you refuel. MS 311, MS 391 Filling Chain Oil Tank Preparations N Thoroughly clean... the oil filler cap and the area around it will otherwise quickly turn to remove, especially in the oil tank when the fuel tank is recommended. Rapidly biodegradable STIHL Bioplus is empty. STIHL Bioplus) since ...
... and repair work carried out exclusively by an authorized STIHL servicing dealer. 27 It may be a small amount of oil in the area of the chain drive, clutch and chain. N Position the machine so that you refuel. MS 311, MS 391 Filling Chain Oil Tank Preparations N Thoroughly clean... the oil filler cap and the area around it will otherwise quickly turn to remove, especially in the oil tank when the fuel tank is recommended. Rapidly biodegradable STIHL Bioplus is empty. STIHL Bioplus) since ...
Product Instruction Manual
Page 31
...drawn in the position r (winter operation) - r facing upwards N Refit the shroud and tighten the screws Heated air is necessary to overheating 0001BA003 KN MS 311, MS 391 29 the saw chain is blocked 1 1 N Pull the slide (1) out of chain brake Winter Operation Pre-heat carburetor English At temperatures below +50... been modified in any way. The chain brake will operate only if it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at idle speed, engage the chain brake (push hand guard toward bar nose). the chain must be free from around ...
...drawn in the position r (winter operation) - r facing upwards N Refit the shroud and tighten the screws Heated air is necessary to overheating 0001BA003 KN MS 311, MS 391 29 the saw chain is blocked 1 1 N Pull the slide (1) out of chain brake Winter Operation Pre-heat carburetor English At temperatures below +50... been modified in any way. The chain brake will operate only if it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at idle speed, engage the chain brake (push hand guard toward bar nose). the chain must be free from around ...
Product Instruction Manual
Page 38
... the rear handle and remove it N always replace a damaged filter Cleaning the air filter N Knock out the filter or blow it clear with a brush! 36 MS 311, MS 391 Retrofitting is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Remove air filter N Clean away loose dirt from the inside outwards. 4903BA002 KN ...4903BA006 KN English Air Filter System Cleaning the Air Filter 1 The air filter system can be damaged in STIHL special-purpose cleaner (special accessories) or a clean, nonflammable cleaning liquid (e.g., warm soapy water) and dry them.
... the rear handle and remove it N always replace a damaged filter Cleaning the air filter N Knock out the filter or blow it clear with a brush! 36 MS 311, MS 391 Retrofitting is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Remove air filter N Clean away loose dirt from the inside outwards. 4903BA002 KN ...4903BA006 KN English Air Filter System Cleaning the Air Filter 1 The air filter system can be damaged in STIHL special-purpose cleaner (special accessories) or a clean, nonflammable cleaning liquid (e.g., warm soapy water) and dry them.
Product Instruction Manual
Page 42
... Warning! Always press spark plug boot (2) snugly onto spark plug terminal (1) of the fan housing away from the crankcase and remove downwards 4903BA005 KN 40 MS 311, MS 391 4903BA002 KN English Install spark plug 1 N Screw in the boot may create arcing that could ignite combustible fumes and cause a fire. 4903BA008 KN Replacing... lever to the stop position 0 N Push the hand guard forwards - To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL.
... Warning! Always press spark plug boot (2) snugly onto spark plug terminal (1) of the fan housing away from the crankcase and remove downwards 4903BA005 KN 40 MS 311, MS 391 4903BA002 KN English Install spark plug 1 N Screw in the boot may create arcing that could ignite combustible fumes and cause a fire. 4903BA008 KN Replacing... lever to the stop position 0 N Push the hand guard forwards - To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL.