Product Instruction Manual
Page 16
... sample of chain saws below 3.8 cubic inches (62 cm³) displacement specified in ANSI B 175.1-2000. New bar/chain combinations may be used with STIHL green labeled low kickback chains. Warning! They are potential powerhead and bar combinations with which have specially designed components...167; 5.11 of ANSI B 175.1-2000. Even if your powerhead with the appropriate bar/chain combination to avoid kickback situations: 14 MS 311, MS 391 There are available from personal injury that may increase kickback forces and the risk of kickback injury. A dull or improperly sharpened...
... sample of chain saws below 3.8 cubic inches (62 cm³) displacement specified in ANSI B 175.1-2000. New bar/chain combinations may be used with STIHL green labeled low kickback chains. Warning! They are potential powerhead and bar combinations with which have specially designed components...167; 5.11 of ANSI B 175.1-2000. Even if your powerhead with the appropriate bar/chain combination to avoid kickback situations: 14 MS 311, MS 391 There are available from personal injury that may increase kickback forces and the risk of kickback injury. A dull or improperly sharpened...
Product Instruction Manual
Page 26
... than one that has been in use for some time. N Shut off the engine. N Engage the peg of the bar - N Loosen the nuts. A new chain has to pull the chain along the bar by hand. N Wear work : N Shut off the engine. N Check chain tension frequently - N While still... the cutting edges on "Operating Instructions". A new chain has to be possible to be retensioned more often than one that has been in use for some time. place the chain over the studs (1) - N Go to chapter on "Operating Instructions". 24 MS 311, MS 391 N The chain must fit snugly against ...
... than one that has been in use for some time. N Shut off the engine. N Engage the peg of the bar - N Loosen the nuts. A new chain has to pull the chain along the bar by hand. N Wear work : N Shut off the engine. N Check chain tension frequently - N While still... the cutting edges on "Operating Instructions". A new chain has to be possible to be retensioned more often than one that has been in use for some time. place the chain over the studs (1) - N Go to chapter on "Operating Instructions". 24 MS 311, MS 391 N The chain must fit snugly against ...
Product Instruction Manual
Page 28
... the fuel pickup body out of the cap. N Open the filler cap and drain the fuel tank. Do not kink the fuel hose - N Push the new pickup body into the hose. N Turn the cap clockwise as far as stop (approx. a quarter turn ). marks must repeat the above steps. 001BA163 KN Change... grip flush with the cap and the detent on the grip does not engage the recess in the tank and close the filler cap. 26 MS 311, MS 391 English Opening the cap Closing the cap Change the fuel pickup body 001BA162 KN 001BA160 KN N Raise the grip until it off the hose...
... the fuel pickup body out of the cap. N Open the filler cap and drain the fuel tank. Do not kink the fuel hose - N Push the new pickup body into the hose. N Turn the cap clockwise as far as stop (approx. a quarter turn ). marks must repeat the above steps. 001BA163 KN Change... grip flush with the cap and the detent on the grip does not engage the recess in the tank and close the filler cap. 26 MS 311, MS 391 English Opening the cap Closing the cap Change the fuel pickup body 001BA162 KN 001BA160 KN N Raise the grip until it off the hose...
Product Instruction Manual
Page 30
... the chain runs dry, the whole cutting attachment will quickly damage the powerhead and chain drive (clutch, chain brake). Every new chain has to be broken in an emergency - during a 28 MS 311, MS 391 N Pull the hand guard back toward the front handle. High revs with chain brake 143BA024 KN 143BA011 KN 143BA012...
... the chain runs dry, the whole cutting attachment will quickly damage the powerhead and chain drive (clutch, chain brake). Every new chain has to be broken in an emergency - during a 28 MS 311, MS 391 N Pull the hand guard back toward the front handle. High revs with chain brake 143BA024 KN 143BA011 KN 143BA012...
Product Instruction Manual
Page 34
... slowly back into the housing so that it can rewind properly With a new engine or after starting) Position starting acceleration n - English Starting N Press the button, the decompression valve will be anyone within the swivel range of the chain saw MS 311, MS 391 simultaneously press down on the decompression valve N Hold and start the...
... slowly back into the housing so that it can rewind properly With a new engine or after starting) Position starting acceleration n - English Starting N Press the button, the decompression valve will be anyone within the swivel range of the chain saw MS 311, MS 391 simultaneously press down on the decompression valve N Hold and start the...
Product Instruction Manual
Page 36
... down . Retension if necessary - If it is off the chain again after about 5 to sag. Long-term storage See "Storing the machine" 34 MS 311, MS 391 Open the throttle only when the chain brake is not slackened off the chain if you need it can be dissipated by hand. see...load) for the first three tank fillings. see "Tensioning the Saw Chain". this period. English Operating Instructions During the break-in period A factory new machine should not be run for a while at idle speed so that has been in use already for an extended period. This avoids unnecessarily high...
... down . Retension if necessary - If it is off the chain again after about 5 to sag. Long-term storage See "Storing the machine" 34 MS 311, MS 391 Open the throttle only when the chain brake is not slackened off the chain if you need it can be dissipated by hand. see...load) for the first three tank fillings. see "Tensioning the Saw Chain". this period. English Operating Instructions During the break-in period A factory new machine should not be run for a while at idle speed so that has been in use already for an extended period. This avoids unnecessarily high...
Product Instruction Manual
Page 40
...low speed screw (L) carefully clockwise as far as stop (no further than 3/4 turn . Chain runs when engine is damaged or heavily carbonized, fit a new one full turn ). If the chain continues moving when the engine is too lean: Turn the low speed screw (L) counterclockwise until the chain begins to...is down on power, check the spark arresting screen in Muffler In some countries the muffler is usually necessary to cool down . 0001BA009 KN 38 MS 311, MS 391 English N Turn the high speed screw (H) counterclockwise as far as stop, then turn it back 1 full turn it another 1 1/2 turns...
...low speed screw (L) carefully clockwise as far as stop (no further than 3/4 turn . Chain runs when engine is damaged or heavily carbonized, fit a new one full turn ). If the chain continues moving when the engine is too lean: Turn the low speed screw (L) counterclockwise until the chain begins to...is down on power, check the spark arresting screen in Muffler In some countries the muffler is usually necessary to cool down . 0001BA009 KN 38 MS 311, MS 391 English N Turn the high speed screw (H) counterclockwise as far as stop, then turn it back 1 full turn it another 1 1/2 turns...
Product Instruction Manual
Page 41
... operation. N Dirty air filter. These factors cause deposits to form on the insulator nose which have caused fouling of the spark plug. MS 311, MS 391 39 N Clean dirty spark plug. operating at idling speed, first check the spark plug. These factors cause deposits to start or ... only resistor type spark plugs of the spark plug. Spark Plug If engine is blocked 1 4903BA007 KN English N Remove spark plug - Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. Wrong fuel mix (too much engine oil in operation. N...
... operation. N Dirty air filter. These factors cause deposits to form on the insulator nose which have caused fouling of the spark plug. MS 311, MS 391 39 N Clean dirty spark plug. operating at idling speed, first check the spark plug. These factors cause deposits to start or ... only resistor type spark plugs of the spark plug. Spark Plug If engine is blocked 1 4903BA007 KN English N Remove spark plug - Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. Wrong fuel mix (too much engine oil in operation. N...
Product Instruction Manual
Page 43
...the direction of the pawl with a screwdriver or suitable pliers - as in the picture Tension the rewind spring 213BA021 KN 213BA018 KN N Thread the new starter rope through the rope guide bush (5) and rope rotor (6) and secure with washer (3) and pawls (4) The rewind spring can jump out ...starter rope 2 3 4 4 2 3 4 English 4 001BA096 KN 001BA096 KN N Carefully press the spring clip (2) off of rope so that it winds onto the rotor MS 311, MS 391 41 N Lever the rope out of the starter handle with non-resinous oil N Slip the rope rotor onto the starter post (7) - the spring clip...
...the direction of the pawl with a screwdriver or suitable pliers - as in the picture Tension the rewind spring 213BA021 KN 213BA018 KN N Thread the new starter rope through the rope guide bush (5) and rope rotor (6) and secure with washer (3) and pawls (4) The rewind spring can jump out ...starter rope 2 3 4 4 2 3 4 English 4 001BA096 KN 001BA096 KN N Carefully press the spring clip (2) off of rope so that it winds onto the rotor MS 311, MS 391 41 N Lever the rope out of the starter handle with non-resinous oil N Slip the rope rotor onto the starter post (7) - the spring clip...
Product Instruction Manual
Page 44
...the rope has been drawn out completely. N Run the engine until the carburetor is dry - STIHL BioPlus, completely fill the chain oil tank. risk of spring may break! N If you use... with a screwdriver N Apply a few drops of children and other unauthorized persons. 42 MS 311, MS 391 the anchor loop (arrow) must be under tension and can spring apart unexpectedly on..."Replace torn starter rope" The broken pieces of injury! pay special attention to the new replacement spring N Position the replacement spring with local environmental requirements. the spring slides out...
...the rope has been drawn out completely. N Run the engine until the carburetor is dry - STIHL BioPlus, completely fill the chain oil tank. risk of spring may break! N If you use... with a screwdriver N Apply a few drops of children and other unauthorized persons. 42 MS 311, MS 391 the anchor loop (arrow) must be under tension and can spring apart unexpectedly on..."Replace torn starter rope" The broken pieces of injury! pay special attention to the new replacement spring N Position the replacement spring with local environmental requirements. the spring slides out...
Product Instruction Manual
Page 45
...spur chain sprocket / rim sprocket N Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) N Slide needle cage onto the crankshaft stub N After refitting,... oil pump drive engages N Refit the rim sprocket - pull hand guard against the front handle Fit new chain sprocket - if the wear marks (arrows) are also heavy signs of the chain brake. 001BA121...N Remove the washer (2) N Remove rim sprocket (3) N Inspect transport profile on the crankshaft MS 311, MS 391 43 Checking and Replacing the Chain Sprocket N Remove chain sprocket cover, saw chain is reduced...
...spur chain sprocket / rim sprocket N Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) N Slide needle cage onto the crankshaft stub N After refitting,... oil pump drive engages N Refit the rim sprocket - pull hand guard against the front handle Fit new chain sprocket - if the wear marks (arrows) are also heavy signs of the chain brake. 001BA121...N Remove the washer (2) N Remove rim sprocket (3) N Inspect transport profile on the crankshaft MS 311, MS 391 43 Checking and Replacing the Chain Sprocket N Remove chain sprocket cover, saw chain is reduced...
Product Instruction Manual
Page 46
...the recommended files or sharpening tools and correct settings are particularly wear resistant. For checking angles Use a STIHL filing gauge (special accessory, see table "Sharpening Tools". It is absolutely essential to comply with resulting...Check the chain for checking the filing and side plate angles, 001BA203 KN 689BA025 KN 44 MS 311, MS 391 see table "Sharpening Tools"). N Replace any damaged or worn parts of the original ... file diameter according to the shape and size of the chain and match the new parts to chain pitch - Use only special saw chain is a risk of ...
...the recommended files or sharpening tools and correct settings are particularly wear resistant. For checking angles Use a STIHL filing gauge (special accessory, see table "Sharpening Tools". It is absolutely essential to comply with resulting...Check the chain for checking the filing and side plate angles, 001BA203 KN 689BA025 KN 44 MS 311, MS 391 see table "Sharpening Tools"). N Replace any damaged or worn parts of the original ... file diameter according to the shape and size of the chain and match the new parts to chain pitch - Use only special saw chain is a risk of ...
Product Instruction Manual
Page 54
Special Accessories Contact your STIHL dealer for information regarding special accessories that fit onto one tab and in inches on the other. 52 MS 311, MS 391 Depending on the scabbard. Each set of locking tabs is marked with the lenght of the bar to comply with the...for the latest STIHL recommendations. Fitting the chain scabbard extension onto the scabbard 1 234 cm INCH 1 234 N Determine the appropriate set of tabs, and let them lock together The scabbard extension has two square cut-outs (1) that may be developed after publication of injury. Since new bar/chain combinations...
Special Accessories Contact your STIHL dealer for information regarding special accessories that fit onto one tab and in inches on the other. 52 MS 311, MS 391 Depending on the scabbard. Each set of locking tabs is marked with the lenght of the bar to comply with the...for the latest STIHL recommendations. Fitting the chain scabbard extension onto the scabbard 1 234 cm INCH 1 234 N Determine the appropriate set of tabs, and let them lock together The scabbard extension has two square cut-outs (1) that may be developed after publication of injury. Since new bar/chain combinations...
Product Instruction Manual
Page 55
...new 1997 and later model year small off -road engine for the first two years of engine use from defects in this manual for small non road engines. STIHL Incorporated must warrant the emission control system on your small off -road equipment engines must be performed only by authorized STIHL service shops. MS 311, MS... 391 53 Original STIHL parts can be designed, built and equipped, at an authorized dealer), parts and labor. Where a warrantable condition exists, STIHL Incorporated will make reordering simpler. STIHL Incorporated...
...new 1997 and later model year small off -road engine for the first two years of engine use from defects in this manual for small non road engines. STIHL Incorporated must warrant the emission control system on your small off -road equipment engines must be performed only by authorized STIHL service shops. MS 311, MS... 391 53 Original STIHL parts can be designed, built and equipped, at an authorized dealer), parts and labor. Where a warrantable condition exists, STIHL Incorporated will make reordering simpler. STIHL Incorporated...
User Manual
Page 4
...the part numbers to third parties. The manual lists all the repair and servicing procedures specific to the assembly stand with the new assembly stand 5910 890 3101 since the mounting plate is issued. Symbols are listed in the chapter on "Special Servicing Tools...and the "STIHL Service Training System" for engineering changes which have been introduced since they, depending on the machine may damage housings when the machine is not shown in position. Technical information bulletins also supplement the parts list until a revised edition is already fitted. MS 311, MS 391 3
...the part numbers to third parties. The manual lists all the repair and servicing procedures specific to the assembly stand with the new assembly stand 5910 890 3101 since the mounting plate is issued. Symbols are listed in the chapter on "Special Servicing Tools...and the "STIHL Service Training System" for engineering changes which have been introduced since they, depending on the machine may damage housings when the machine is not shown in position. Technical information bulletins also supplement the parts list until a revised edition is already fitted. MS 311, MS 391 3
User Manual
Page 5
... regulations. 216RA000 TG 1.2 Safety Precautions If the machine is started up in the course of repairs or maintenance work with STIHL press fluid and then push the new hoses on the fuel system and the engine. Do not re-use sharp-edged pliers, screwdrivers, etc. Other press fluids... knife or similar tool. Preparations for wear or damage before carrying out repairs or mounting the machine to the hose barbs, b 14. 4 MS 311, MS 391 Storing and disposing of oils and fuels Collect fuel or lubricating oil in a clean container and dispose of the hoses and the connectors with...
... regulations. 216RA000 TG 1.2 Safety Precautions If the machine is started up in the course of repairs or maintenance work with STIHL press fluid and then push the new hoses on the fuel system and the engine. Do not re-use sharp-edged pliers, screwdrivers, etc. Other press fluids... knife or similar tool. Preparations for wear or damage before carrying out repairs or mounting the machine to the hose barbs, b 14. 4 MS 311, MS 391 Storing and disposing of oils and fuels Collect fuel or lubricating oil in a clean container and dispose of the hoses and the connectors with...
User Manual
Page 8
Tighten the screw clockwise to the specified torque. Coat micro-encapsulated screws with and without binding heads. MS 311, MS 391 7 Do not mix up screws with medium-strength threadlocking adhesive before re-installing. This procedure ensures that the screw engages properly in the hole ...-free Use the following procedure when refitting a DG or P screw in an existing thread: Place the screw in the existing thread and does not form a new thread and weaken the assembly. Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact wrench for releasing or...
Tighten the screw clockwise to the specified torque. Coat micro-encapsulated screws with and without binding heads. MS 311, MS 391 7 Do not mix up screws with medium-strength threadlocking adhesive before re-installing. This procedure ensures that the screw engages properly in the hole ...-free Use the following procedure when refitting a DG or P screw in an existing thread: Place the screw in the existing thread and does not form a new thread and weaken the assembly. Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact wrench for releasing or...
User Manual
Page 9
... Saw chain stops under load at full Clutch shoes badly worn throttle Clutch drum badly worn Remedy Install new clutch Install new clutch drum Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA...new clutch Clutch spring hooks broken Replace the clutch springs or install new clutch Loud noises Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Needle cage damaged Fit new needle cage Clutch shoe retainer broken Install new retainer or clutch Clutch shoes and carrier worn Install new clutch 8 MS 311, MS...
... Saw chain stops under load at full Clutch shoes badly worn throttle Clutch drum badly worn Remedy Install new clutch Install new clutch drum Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA...new clutch Clutch spring hooks broken Replace the clutch springs or install new clutch Loud noises Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Needle cage damaged Fit new needle cage Clutch shoe retainer broken Install new retainer or clutch Clutch shoes and carrier worn Install new clutch 8 MS 311, MS...
User Manual
Page 10
... sprocket Saw chain stops under load at full Clutch shoes badly worn throttle Clutch drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too ...the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 311, MS 391 9
... sprocket Saw chain stops under load at full Clutch shoes badly worn throttle Clutch drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too ...the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 311, MS 391 9
User Manual
Page 11
... sources of oil pump if necessary Oil inlet hole in guide bar is blocked Clean oil inlet hole Intake hose or pickup body clogged Fit new intake hose and pickup or intake hose ruptured body Valve in oil tank blocked Clean or replace valve Teeth on worm worn Install... new oil pump Worm drive spring not engaged in Engage drive spring in notch in clutch drum clutch drum Oil pump delivery rate set too low Adjust oil pump (only on version with the chain lubrication system, check and . 3.3 Chain Lubrication In the event of trouble with adjustable oil pump) 10 MS 311, MS...
... sources of oil pump if necessary Oil inlet hole in guide bar is blocked Clean oil inlet hole Intake hose or pickup body clogged Fit new intake hose and pickup or intake hose ruptured body Valve in oil tank blocked Clean or replace valve Teeth on worm worn Install... new oil pump Worm drive spring not engaged in Engage drive spring in notch in clutch drum clutch drum Oil pump delivery rate set too low Adjust oil pump (only on version with the chain lubrication system, check and . 3.3 Chain Lubrication In the event of trouble with adjustable oil pump) 10 MS 311, MS...
