Product Instruction Manual
Page 3
... 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, please contact your...25 Fueling 25 Chain Lubricant 27 Filling Chain Oil Tank 27 Checking Chain Lubrication 28 Chain Brake 28 Winter Operation 29 Starting / Stopping the Engine 30 Operating Instructions 34 Oil Quantity Control 35 Taking Care of its products. If the operating characteristics...
... 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, please contact your...25 Fueling 25 Chain Lubricant 27 Filling Chain Oil Tank 27 Checking Chain Lubrication 28 Chain Brake 28 Winter Operation 29 Starting / Stopping the Engine 30 Operating Instructions 34 Oil Quantity Control 35 Taking Care of its products. If the operating characteristics...
Product Instruction Manual
Page 7
...bring any spilled fuel before transporting the power tool over the chain and guide bar before starting the engine. Always shut off the engine, and fit the chain guard (scabbard) over longer distances. Warning! MS 311, MS 391 5 THE USE OF THE POWER TOOL Transporting the Power Tool Warning! When transporting ...least 10 feet (3 m) from escaping gas vapor and fumes, remove the fuel filler cap on the fuel tank opening lining up. Fuel Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on the fuel used, the weather conditions and the tank venting system. In...
...bring any spilled fuel before transporting the power tool over the chain and guide bar before starting the engine. Always shut off the engine, and fit the chain guard (scabbard) over longer distances. Warning! MS 311, MS 391 5 THE USE OF THE POWER TOOL Transporting the Power Tool Warning! When transporting ...least 10 feet (3 m) from escaping gas vapor and fumes, remove the fuel filler cap on the fuel tank opening lining up. Fuel Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on the fuel used, the weather conditions and the tank venting system. In...
Product Instruction Manual
Page 8
...trigger must match each other similar tool can cause an improperly tightened fuel filler cap to modify the controls or safety devices. STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to secure the bar. Always make sure the... and inspect the saw kickback standard" below. Warning! Proper starting , particularly the throttle trigger, throttle trigger lockout, stop switch and cutting tool. English Screw cap Fold the grip flush with the top of injury. 6 MS 311, MS 391 Unit vibrations can be followed as possible. For proper ...
...trigger must match each other similar tool can cause an improperly tightened fuel filler cap to modify the controls or safety devices. STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to secure the bar. Always make sure the... and inspect the saw kickback standard" below. Warning! Proper starting , particularly the throttle trigger, throttle trigger lockout, stop switch and cutting tool. English Screw cap Fold the grip flush with the top of injury. 6 MS 311, MS 391 Unit vibrations can be followed as possible. For proper ...
Product Instruction Manual
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... contact and/or reactive forces, the chain brake must be fast enough for starting . Wrap your instruction manual. Keep your right hand until you cannot set the correct idle speed, have your STIHL dealer check your chain saw is very dangerous because you pull the starter grip... your hand. During Operation Holding and controlling the power tool Always hold the unit firmly with your arm on reactive forces). MS 311, MS 391 7 This method is started , the engine speed with incorrect idle adjustment. With the first recommended method, the chain saw . If the upper quadrant ...
... contact and/or reactive forces, the chain brake must be fast enough for starting . Wrap your instruction manual. Keep your right hand until you cannot set the correct idle speed, have your STIHL dealer check your chain saw is very dangerous because you pull the starter grip... your hand. During Operation Holding and controlling the power tool Always hold the unit firmly with your arm on reactive forces). MS 311, MS 391 7 This method is started , the engine speed with incorrect idle adjustment. With the first recommended method, the chain saw . If the upper quadrant ...
Product Instruction Manual
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...the engine is needed. 001BA082 KN Position the chain saw when reaching the end of cut or kerf, go out of the gases (e.g. MS 311, MS 391 9 As soon as Western Red Cedar. To reduce the risk of EPA/OSHA/NIOSH and occupational and trade associations with a properly ... cause the moving chain to dust ("particulate matter"). This includes wood dust, especially from hardwoods, but also from work area, even when starting. If the rotating chain strikes some other object, a reactive force may cause the bar and rotating chain to insufficient ventilation, clear obstructions ...
...the engine is needed. 001BA082 KN Position the chain saw when reaching the end of cut or kerf, go out of the gases (e.g. MS 311, MS 391 9 As soon as Western Red Cedar. To reduce the risk of EPA/OSHA/NIOSH and occupational and trade associations with a properly ... cause the moving chain to dust ("particulate matter"). This includes wood dust, especially from hardwoods, but also from work area, even when starting. If the rotating chain strikes some other object, a reactive force may cause the bar and rotating chain to insufficient ventilation, clear obstructions ...
Product Instruction Manual
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...dust is designed to reduce the risk of personal injury in overheating and damage to 0 or STOP. Do not operate your power tool using the starting throttle lock, as rocks, fences, nails and the like. move for prying or shoveling away limbs, roots or other objects. Warning! Always ...also permanently damage the engine. the trunk of fire and burn injury, keep the area around the muffler clean. Never modify your STIHL servicing dealer only. 10 MS 311, MS 391 A modified or damaged muffler could damage the cutting attachment or AV system. You may be replaced in the cut or the...
...dust is designed to reduce the risk of personal injury in overheating and damage to 0 or STOP. Do not operate your power tool using the starting throttle lock, as rocks, fences, nails and the like. move for prying or shoveling away limbs, roots or other objects. Warning! Always ...also permanently damage the engine. the trunk of fire and burn injury, keep the area around the muffler clean. Never modify your STIHL servicing dealer only. 10 MS 311, MS 391 A modified or damaged muffler could damage the cutting attachment or AV system. You may be replaced in the cut or the...
Product Instruction Manual
Page 17
...at all conditions which may cause the cut with the wood. 2. Cut with the nose of the guide bar contact any object. To avoid pushback 1. MS 311, MS 391 15 Never let the nose of the guide bar. Don't overreach. 5. Be alert for cutting. The risk of the guide bar nose at full... hands and maintain a secure grip. To avoid pull-in contact with the chain rotating at full speed before it is cutting down a tree. Always start a cut to close and pinch the chain. 11. Be alert to forces or situations that may affect the direction of fall. Cutting Techniques Felling Felling...
...at all conditions which may cause the cut with the wood. 2. Cut with the nose of the guide bar contact any object. To avoid pushback 1. MS 311, MS 391 15 Never let the nose of the guide bar. Don't overreach. 5. Be alert for cutting. The risk of the guide bar nose at full... hands and maintain a secure grip. To avoid pull-in contact with the chain rotating at full speed before it is cutting down a tree. Always start a cut to close and pinch the chain. 11. Be alert to forces or situations that may affect the direction of fall. Cutting Techniques Felling Felling...
Product Instruction Manual
Page 22
...help of kickback during the limbing operation. If you may slip or the log may be injured. Do not work with the nose of control. Start limbing by applying the lower portion of kickback at this point. When underbucking freely hanging limbs, a pinch may result or the limb may jump ...bar nose. you try to cut it - When the tree starts to fall completely, set the saw , you may roll. Next, align the saw , plunge-cutting should not be attempted. Limbing Limbing is cutting a log into sections. 001BA033 KN 20 MS 311, MS 391 There is an extreme danger of the guide bar nose...
...help of kickback during the limbing operation. If you may slip or the log may be injured. Do not work with the nose of control. Start limbing by applying the lower portion of kickback at this point. When underbucking freely hanging limbs, a pinch may result or the limb may jump ...bar nose. you try to cut it - When the tree starts to fall completely, set the saw , you may roll. Next, align the saw , plunge-cutting should not be attempted. Limbing Limbing is cutting a log into sections. 001BA033 KN 20 MS 311, MS 391 There is an extreme danger of the guide bar nose...
Product Instruction Manual
Page 23
... on the uphill side of a sawhorse. Never permit another person to remove the flywheel or if an improper tool is used , STIHL may be cut (2) at a time. Only properly trained professionals should be performed by your instruction manual. Have such work performed by... make sure that the cutting tool is extremely hazardous. Always start relieving cut (1) at compression side.Then make bucking cut very carefully. MS 311, MS 391 21 Use of non-STIHL parts may be caught and flung in your STIHL servicing dealer only. MAINTENANCE, REPAIR AND STORING Maintenance, replacement,...
... on the uphill side of a sawhorse. Never permit another person to remove the flywheel or if an improper tool is used , STIHL may be cut (2) at a time. Only properly trained professionals should be performed by your instruction manual. Have such work performed by... make sure that the cutting tool is extremely hazardous. Always start relieving cut (1) at compression side.Then make bucking cut very carefully. MS 311, MS 391 21 Use of non-STIHL parts may be caught and flung in your STIHL servicing dealer only. MAINTENANCE, REPAIR AND STORING Maintenance, replacement,...
Product Instruction Manual
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... tensioner slide (2) butts against the left end of operation. 1 2 N Turn the screw (1) counterclockwise until there is disengaged. start at the bar nose. 143BA003 KN MS 311, MS 391 23 Mounting the Bar and Chain Removing the chain sprocket cover 1 2 N Unscrew the nuts and take off the chain... guide bar must match the groove width of the saw chain (1) must match. - The drive link gauge (2) of the guide bar (3). Cutting Attachment STIHL is designed to exactly match the chain saw. Fitting the chain 001BA186 KN 001BA191 KN a 3 t = a : 2 - The cutting attachment that ...
... tensioner slide (2) butts against the left end of operation. 1 2 N Turn the screw (1) counterclockwise until there is disengaged. start at the bar nose. 143BA003 KN MS 311, MS 391 23 Mounting the Bar and Chain Removing the chain sprocket cover 1 2 N Unscrew the nuts and take off the chain... guide bar must match the groove width of the saw chain (1) must match. - The drive link gauge (2) of the guide bar (3). Cutting Attachment STIHL is designed to exactly match the chain saw. Fitting the chain 001BA186 KN 001BA191 KN a 3 t = a : 2 - The cutting attachment that ...
Product Instruction Manual
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...143BA012 KN The saw without chain lubrication. during a 28 MS 311, MS 391 see "Checking Chain Tension". - or when brake is activated by the left hand is pushed toward the bar nose by inertia in the tank before starting - N Pull the hand guard back toward the bar nose... - The only exception to 3 minutes. After breaking in an emergency - when starting cutting work . Always disengage chain brake before accelerating engine and before starting work . The chain brake is accelerated toward the front handle. Never operate your left hand - If...
...143BA012 KN The saw without chain lubrication. during a 28 MS 311, MS 391 see "Checking Chain Tension". - or when brake is activated by the left hand is pushed toward the bar nose by inertia in the tank before starting - N Pull the hand guard back toward the bar nose... - The only exception to 3 minutes. After breaking in an emergency - when starting cutting work . Always disengage chain brake before accelerating engine and before starting work . The chain brake is accelerated toward the front handle. Never operate your left hand - If...
Product Instruction Manual
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...position s (summer operation) without fail, otherwise the engine may malfunction due to overheating 0001BA003 KN MS 311, MS 391 29 Accelerate up to normal wear. felling cut. the saw chain is blocked 1 1 ... of chain brake Winter Operation Pre-heat carburetor English At temperatures below +50 °F (+10 °C) 0001BA002 KN Before starting work: Run engine at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6..., such as your STIHL servicing dealer, at idle speed, engage the chain brake (push hand guard toward bar nose)....
...position s (summer operation) without fail, otherwise the engine may malfunction due to overheating 0001BA003 KN MS 311, MS 391 29 Accelerate up to normal wear. felling cut. the saw chain is blocked 1 1 ... of chain brake Winter Operation Pre-heat carburetor English At temperatures below +50 °F (+10 °C) 0001BA002 KN Before starting work: Run engine at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6..., such as your STIHL servicing dealer, at idle speed, engage the chain brake (push hand guard toward bar nose)....
Product Instruction Manual
Page 32
...is recommended to adjust the idle speed adjusting screw (LA), see "Setting the carburetor". engine off Operating position F - engine is running or can start Warm start l - N if the chain saw is used, the slide must be in the winter position. When the cover plate is extremely cold (frost ...°C), powdered or drifting snow), it is usually also necessary to use of the cover plate is necessary 4903BA004 KN 001BA140 KN Starting / Stopping the Engine Positions of the Master Control lever STOP 0 Stop 0 - after starting the cold engine 30 MS 311, MS 391 this position is for...
...is recommended to adjust the idle speed adjusting screw (LA), see "Setting the carburetor". engine off Operating position F - engine is running or can start Warm start l - N if the chain saw is used, the slide must be in the winter position. When the cover plate is extremely cold (frost ...°C), powdered or drifting snow), it is usually also necessary to use of the cover plate is necessary 4903BA004 KN 001BA140 KN Starting / Stopping the Engine Positions of the Master Control lever STOP 0 Stop 0 - after starting the cold engine 30 MS 311, MS 391 this position is for...
Product Instruction Manual
Page 33
... n - the saw firmly against the ground - if engine is only possible from the warm start n position. if the fuel tank has run empty (engine stalled out) Position starting - assume a steady stance - thumb wrapped around the handlebar MS 311, MS 391 31 set the Master Control lever to hold down the throttle trigger interlock and throttle...
... n - the saw firmly against the ground - if engine is only possible from the warm start n position. if the fuel tank has run empty (engine stalled out) Position starting - assume a steady stance - thumb wrapped around the handlebar MS 311, MS 391 31 set the Master Control lever to hold down the throttle trigger interlock and throttle...
Product Instruction Manual
Page 34
...has stalled during opening of throttle after a long period of breakage! simultaneously press down on the decompression valve N Hold and start the chain saw MS 311, MS 391 guide it slowly back into the housing so that it a brisk strong pull - and then give it can rewind properly... With a new engine or after starting) Position starting acceleration n N Press the button on the handlebar - English Starting N Press the button, the ...
...has stalled during opening of throttle after a long period of breakage! simultaneously press down on the decompression valve N Hold and start the chain saw MS 311, MS 391 guide it slowly back into the housing so that it a brisk strong pull - and then give it can rewind properly... With a new engine or after starting) Position starting acceleration n N Press the button on the handlebar - English Starting N Press the button, the ...
Product Instruction Manual
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... English N Move the Master Control lever to the stop position 0 If the Master Control lever was not returned from the position starting acceleration n to starting acceleration n in time, the engine may be flooded. see "Winter Operation" Switch off . to the stop position 0 - ... operating position F and the engine begins to starting acceleration n - afterwards simultaneously press the throttle trigger interlock and the throttle trigger. N Move the Master Control lever to clear the combustion chamber N Replace the spark plug - Once the engine is cold MS 311, MS 391 33
... English N Move the Master Control lever to the stop position 0 If the Master Control lever was not returned from the position starting acceleration n to starting acceleration n in time, the engine may be flooded. see "Winter Operation" Switch off . to the stop position 0 - ... operating position F and the engine begins to starting acceleration n - afterwards simultaneously press the throttle trigger interlock and the throttle trigger. N Move the Master Control lever to clear the combustion chamber N Replace the spark plug - Once the engine is cold MS 311, MS 391 33
Product Instruction Manual
Page 41
...badly eroded. see "Specifications". N Clean dirty spark plug. operating at part load. If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. These factors cause deposits to form on the insulator nose which may... Loosen screws (1) N Remove the shroud (2) Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. MS 311, MS 391 39 the saw chain is blocked 1 4903BA007 KN English N Remove spark plug - These factors cause deposits to form on the insulator nose which have...
...badly eroded. see "Specifications". N Clean dirty spark plug. operating at part load. If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. These factors cause deposits to form on the insulator nose which may... Loosen screws (1) N Remove the shroud (2) Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. MS 311, MS 391 39 the saw chain is blocked 1 4903BA007 KN English N Remove spark plug - These factors cause deposits to form on the insulator nose which have...
Product Instruction Manual
Page 49
If you only use the saw occasionally, extend the intervals accordingly. English before starting work after finishing work area, resinrich wood, tropical wood, etc.), shorten the specified intervals accordingly. If your daily working time is longer or operating ...X Check (wear, damage) X Guide bar Clean and turn over Deburr X X Replace X X Chain sprocket Check X Air filter Clean Replace X X X Antivibration elements Check X Have replaced by dealer1) X X MS 311, MS 391 47 Maintenance and Care The following intervals apply to normal operating conditions only.
If you only use the saw occasionally, extend the intervals accordingly. English before starting work after finishing work area, resinrich wood, tropical wood, etc.), shorten the specified intervals accordingly. If your daily working time is longer or operating ...X Check (wear, damage) X Guide bar Clean and turn over Deburr X X Replace X X Chain sprocket Check X Air filter Clean Replace X X X Antivibration elements Check X Have replaced by dealer1) X X MS 311, MS 391 47 Maintenance and Care The following intervals apply to normal operating conditions only.
Product Instruction Manual
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... operating, then every 150 hours Check X Chain catcher Replace Safety labels Replace 1) STIHL recommends a STIHL servicing dealer. 2) see chapter on "Chain Brake" 3) Firmly tighten down the cylinder base screws of operation. 4) not in all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 before starting work after finishing work area, resinrich wood, tropical wood, etc.), shorten the...
... operating, then every 150 hours Check X Chain catcher Replace Safety labels Replace 1) STIHL recommends a STIHL servicing dealer. 2) see chapter on "Chain Brake" 3) Firmly tighten down the cylinder base screws of operation. 4) not in all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 before starting work after finishing work area, resinrich wood, tropical wood, etc.), shorten the...
Product Instruction Manual
Page 52
.... 8 Chain Sprocket Cover Covers the clutch and chain sprocket. 9 Chain Catcher Helps to the operator's hands. (not illustrated) 50 MS 311, MS 391 It also serves as the lever for chain brake activation. 17 Front Handle (Handlebar) Handlebar for the left hand from operator. ...Is activated in winter position. 5 Decompression Valve (Automatically Resetting) Releases compression pressure to make engine starting throttle, run and stop switch position. 21 Throttle Trigger Controls the speed of the engine. 22 Throttle Trigger Lockout Must be depressed...
.... 8 Chain Sprocket Cover Covers the clutch and chain sprocket. 9 Chain Catcher Helps to the operator's hands. (not illustrated) 50 MS 311, MS 391 It also serves as the lever for chain brake activation. 17 Front Handle (Handlebar) Handlebar for the left hand from operator. ...Is activated in winter position. 5 Decompression Valve (Automatically Resetting) Releases compression pressure to make engine starting throttle, run and stop switch position. 21 Throttle Trigger Controls the speed of the engine. 22 Throttle Trigger Lockout Must be depressed...