Product Instruction Manual
Page 3
... and Rewind Spring 40 Storing the Machine 42 Checking and Replacing the Chain Sprocket 43 Maintaining and Sharpening the Saw 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...
... and Rewind Spring 40 Storing the Machine 42 Checking and Replacing the Chain Sprocket 43 Maintaining and Sharpening the Saw 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...
Product Instruction Manual
Page 8
... of the bar and chain follow the procedure described in the chapter "Mounting the Bar and Chain" of the instruction manual. Before replacing any bar and chain, see the appropriate section..., see the chapter entitled "Specifications" in tightening slotted fuel filler caps. Warning! STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to maintain a firm...chain becomes loose while cutting, shut off and spill quantities of the cap. it is not properly seated and tightened and you to the idle position. To reduce the risk of injury. 6 MS 311, MS...
... of the bar and chain follow the procedure described in the chapter "Mounting the Bar and Chain" of the instruction manual. Before replacing any bar and chain, see the appropriate section..., see the chapter entitled "Specifications" in tightening slotted fuel filler caps. Warning! STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to maintain a firm...chain becomes loose while cutting, shut off and spill quantities of the cap. it is not properly seated and tightened and you to the idle position. To reduce the risk of injury. 6 MS 311, MS...
Product Instruction Manual
Page 12
... , damage the saw chain or cause the saw with a chain catcher. In the event of burns do not touch the muffler and other parts of a thrown or broken chain. Warning! You may be replaced, consult your STIHL servicing dealer only. 10 MS 311, MS 391 Antivibration elements should... be damaged or removed. Such objects may be replaced in the event of the engine (e.g. Have your muffler....
... , damage the saw chain or cause the saw with a chain catcher. In the event of burns do not touch the muffler and other parts of a thrown or broken chain. Warning! You may be replaced, consult your STIHL servicing dealer only. 10 MS 311, MS 391 Antivibration elements should... be damaged or removed. Such objects may be replaced in the event of the engine (e.g. Have your muffler....
Product Instruction Manual
Page 14
... their effectiveness when they have been improperly maintained. Warning! STIHL Quickstop chain brake STIHL has developed a chain stopping system designed to reduce kickback injuries may lose some ... not automatically mean that may bear no longer in real life cutting situations. replacement chain designated "low kickback saw to comply with the computed kickback angle requirements of ...MS 311, MS 391 To reduce the risk of ANSI B 175.1-2000 use is called a Quickstop chain brake. Do not use the saw chain you use only the following cutting attachments: - These include chain...
... their effectiveness when they have been improperly maintained. Warning! STIHL Quickstop chain brake STIHL has developed a chain stopping system designed to reduce kickback injuries may lose some ... not automatically mean that may bear no longer in real life cutting situations. replacement chain designated "low kickback saw to comply with the computed kickback angle requirements of ...MS 311, MS 391 To reduce the risk of ANSI B 175.1-2000 use is called a Quickstop chain brake. Do not use the saw chain you use only the following cutting attachments: - These include chain...
Product Instruction Manual
Page 23
...systems may deny coverage. 001BA151 KN Warning! 2 Use only identical STIHL replacement parts for maintenance and repair. shaped supports on the uphill side of non-STIHL parts may be caught and flung in 1 this manual. 001BA152... KN When cutting small logs, place log through "V" - If the saw chains. MAINTENANCE, REPAIR AND STORING Maintenance, replacement, or repair of a sawhorse. Do not attempt any maintenance or repair work not described in the appropriate section of your instruction manual. MS 311, MS...
...systems may deny coverage. 001BA151 KN Warning! 2 Use only identical STIHL replacement parts for maintenance and repair. shaped supports on the uphill side of non-STIHL parts may be caught and flung in 1 this manual. 001BA152... KN When cutting small logs, place log through "V" - If the saw chains. MAINTENANCE, REPAIR AND STORING Maintenance, replacement, or repair of a sawhorse. Do not attempt any maintenance or repair work not described in the appropriate section of your instruction manual. MS 311, MS...
Product Instruction Manual
Page 24
...spark plug boot removed from children. Excessive wear will increase the risk of the brake system according to trained personnel such as your STIHL chain saw chain brake incurs wear each use. every three months, Moderate usage - twice a year, Occasional usage - Remember that could ignite combustible ...create arcing that the risk of the chain brake and can spot a dull chain when easy-to-cut and burn marks appear on the drum. If your chain saw in the instruction manual). 22 MS 311, MS 391 replace worn sprockets or chains. Store chain saw if the muffler is engaged. ...
...spark plug boot removed from children. Excessive wear will increase the risk of the brake system according to trained personnel such as your STIHL chain saw chain brake incurs wear each use. every three months, Moderate usage - twice a year, Occasional usage - Remember that could ignite combustible ...create arcing that the risk of the chain brake and can spot a dull chain when easy-to-cut and burn marks appear on the drum. If your chain saw in the instruction manual). 22 MS 311, MS 391 replace worn sprockets or chains. Store chain saw if the muffler is engaged. ...
Product Instruction Manual
Page 35
... running STOP 1 0 2 N Press the throttle trigger interlock and blip the throttle trigger (2); Open the throttle only when the chain brake is cold MS 311, MS 391 33 even if the engine is off engine N Press the button on (saw is released - see "Spark plug" N Set...engine may be flooded. Once the engine is stationary) will quickly damage the clutch and chain brake. 001BA186 KN The Master Control lever was moved from the position choke shutter closed l to clear the combustion chamber N Replace the spark plug - to starting acceleration n to the stop position 0 N Remove ...
... running STOP 1 0 2 N Press the throttle trigger interlock and blip the throttle trigger (2); Open the throttle only when the chain brake is cold MS 311, MS 391 33 even if the engine is off engine N Press the button on (saw is released - see "Spark plug" N Set...engine may be flooded. Once the engine is stationary) will quickly damage the clutch and chain brake. 001BA186 KN The Master Control lever was moved from the position choke shutter closed l to clear the combustion chamber N Replace the spark plug - to starting acceleration n to the stop position 0 N Remove ...
Product Instruction Manual
Page 37
...Turn the bar over - N turn the adjusting screw counterclockwise. every time you sharpen the chain and every time you replace the chain - N Measure the groove depth - MS 311, MS 391 35 The chain must always be wetted with the scale on the filing gauge (special accessory) - The ... lengths, types of the bar. N turn the adjusting screw clockwise. English Oil Quantity Control Adjustable flow oil pump is less than specified: N Replace the guide bar. Chain type Picco Rapid Rapid Rapid Pitch Minimum groove depth 3/8" P 0.20" (5.0 mm) 1/4" 0.16" (4.0 mm) 3/8"; 0.325" 0.24" ...
...Turn the bar over - N turn the adjusting screw counterclockwise. every time you sharpen the chain and every time you replace the chain - N Measure the groove depth - MS 311, MS 391 35 The chain must always be wetted with the scale on the filing gauge (special accessory) - The ... lengths, types of the bar. N turn the adjusting screw clockwise. English Oil Quantity Control Adjustable flow oil pump is less than specified: N Replace the guide bar. Chain type Picco Rapid Rapid Rapid Pitch Minimum groove depth 3/8" P 0.20" (5.0 mm) 1/4" 0.16" (4.0 mm) 3/8"; 0.325" 0.24" ...
Product Instruction Manual
Page 38
...damaged in STIHL special-purpose cleaner (special accessories) or a clean, nonflammable cleaning liquid (e.g., warm soapy water) and dry them. If there is equipped with a brush! 36 MS 311, MS 391 Depending on equipment version, the machine is a noticeable loss of the filter in the process. the saw chain is simple.... Do not clean fleece filters with a felt filter or a fabric filter. the air filter could be adapted to the rear and tilt the air filter toward the rear handle and remove it N always replace a damaged filter Cleaning the air...
...damaged in STIHL special-purpose cleaner (special accessories) or a clean, nonflammable cleaning liquid (e.g., warm soapy water) and dry them. If there is equipped with a brush! 36 MS 311, MS 391 Depending on equipment version, the machine is a noticeable loss of the filter in the process. the saw chain is simple.... Do not clean fleece filters with a felt filter or a fabric filter. the air filter could be adapted to the rear and tilt the air filter toward the rear handle and remove it N always replace a damaged filter Cleaning the air...
Product Instruction Manual
Page 42
...chain is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Removing the fan housing 1 1 1 1 N Remove screws (1) N Push hand guard upward N Pull the bottom of fire and burn injury, use only spark plugs authorized by STIHL. To reduce the risk of the fan housing away from the crankcase and remove downwards 4903BA005 KN 40 MS 311, MS...1 N Screw in the boot may create arcing that could ignite combustible fumes and cause a fire. 4903BA008 KN Replacing the Starter Rope and Rewind Spring Remove shroud N Move the Master Control lever to the stop position 0 N Push the hand ...
...chain is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Removing the fan housing 1 1 1 1 N Remove screws (1) N Push hand guard upward N Pull the bottom of fire and burn injury, use only spark plugs authorized by STIHL. To reduce the risk of the fan housing away from the crankcase and remove downwards 4903BA005 KN 40 MS 311, MS...1 N Screw in the boot may create arcing that could ignite combustible fumes and cause a fire. 4903BA008 KN Replacing the Starter Rope and Rewind Spring Remove shroud N Move the Master Control lever to the stop position 0 N Push the hand ...
Product Instruction Manual
Page 44
...the fan housing N Refit the shroud and tighten the screws Replacing broken rewind spring N Remove the rope rotor as described for "Replace torn starter rope" The broken pieces of children and other unauthorized persons. 42 MS 311, MS 391 If it tips sideways: increase the spring tension by ... of the reach of spring may break! N Dispose of injury! N If you use a biological chain and bar lubricant, e.g. STIHL BioPlus, completely fill the chain oil tank. N Remove the saw chain and guide bar, clean them and spray with local environmental requirements. It must be located over the...
...the fan housing N Refit the shroud and tighten the screws Replacing broken rewind spring N Remove the rope rotor as described for "Replace torn starter rope" The broken pieces of children and other unauthorized persons. 42 MS 311, MS 391 If it tips sideways: increase the spring tension by ... of the reach of spring may break! N Dispose of injury! N If you use a biological chain and bar lubricant, e.g. STIHL BioPlus, completely fill the chain oil tank. N Remove the saw chain and guide bar, clean them and spray with local environmental requirements. It must be located over the...
Product Instruction Manual
Page 45
... transport profile on the crankshaft MS 311, MS 391 43 with versions with two chain brake systems, press throttle lock beforehand English Install spur chain sprocket / rim sprocket N Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) N ...- Use only STIHL original chain sprockets to ensure reliable functioning of two saw chain is reduced - pull hand guard against the front handle Fit new chain sprocket - Checking and Replacing the Chain Sprocket N Remove chain sprocket cover, saw chains in (0.5 mm) - use of the chain brake. 001BA121 KN...
... transport profile on the crankshaft MS 311, MS 391 43 with versions with two chain brake systems, press throttle lock beforehand English Install spur chain sprocket / rim sprocket N Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) N ...- Use only STIHL original chain sprockets to ensure reliable functioning of two saw chain is reduced - pull hand guard against the front handle Fit new chain sprocket - Checking and Replacing the Chain Sprocket N Remove chain sprocket cover, saw chains in (0.5 mm) - use of the chain brake. 001BA121 KN...
Product Instruction Manual
Page 46
... 001BA203 KN 689BA025 KN 44 MS 311, MS 391 The angles must observe certain angles when resharpening the chain cutter. The correct filing angles are uneven: Chain will increase the physical effort required, produce unsatisfactory results and a higher rate of injury. 3/8 The chain pitch (e.g. 3/8") is absolutely .... there is a risk of increased kickback of the chain and match the new parts to chain pitch - N Replace any damaged or worn parts of the saw chain is set too low - For checking angles Use a STIHL filing gauge (special accessory, see table "Sharpening Tools"....
... 001BA203 KN 689BA025 KN 44 MS 311, MS 391 The angles must observe certain angles when resharpening the chain cutter. The correct filing angles are uneven: Chain will increase the physical effort required, produce unsatisfactory results and a higher rate of injury. 3/8 The chain pitch (e.g. 3/8") is absolutely .... there is a risk of increased kickback of the chain and match the new parts to chain pitch - N Replace any damaged or worn parts of the saw chain is set too low - For checking angles Use a STIHL filing gauge (special accessory, see table "Sharpening Tools"....
Product Instruction Manual
Page 49
.../filter in fuel tank Clean, replace filter element X X Replace X X X Fuel tank Clean X Chain oil tank Clean X Chain Lubrication Check X Inspect, also check sharpness X X Saw chain Check chain tension X X Sharpen 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...
.../filter in fuel tank Clean, replace filter element X X Replace X X X Fuel tank Clean X Chain oil tank Clean X Chain Lubrication Check X Inspect, also check sharpness X X Saw chain Check chain tension X X Sharpen 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...
Product Instruction Manual
Page 50
... 4) not in muffler Check Clean or replace Combustion chamber Decoke after first 139 hours of 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... - chain must not rotate X X Readjust idle Spark Plug Readjust electrode gap Replace after every 100 operating hours All accessible screws and nuts (not adjusting screws) 3) Retighten Sparl arresting screen4) in all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 ...
... 4) not in muffler Check Clean or replace Combustion chamber Decoke after first 139 hours of 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... - chain must not rotate X X Readjust idle Spark Plug Readjust electrode gap Replace after every 100 operating hours All accessible screws and nuts (not adjusting screws) 3) Retighten Sparl arresting screen4) in all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 ...
Product Instruction Manual
Page 54
...set of locking tabs is marked with the lenght of different lengths on this Manual, ask your STIHL dealer for the latest STIHL recommendations. Chain scabbard If you use replacement saw chains unless they correspond, given in centimeters on the length the bar N Push the scabbard extension ... unit, or have been designated as a special accessory. If the chain scabbard does not cover the full length of locking tabs (2, 3, 4) located on the other. 52 MS 311, MS 391 Special Accessories Contact your STIHL dealer for information regarding special accessories that fit onto one tab and ...
...set of locking tabs is marked with the lenght of different lengths on this Manual, ask your STIHL dealer for the latest STIHL recommendations. Chain scabbard If you use replacement saw chains unless they correspond, given in centimeters on the length the bar N Push the scabbard extension ... unit, or have been designated as a special accessory. If the chain scabbard does not cover the full length of locking tabs (2, 3, 4) located on the other. 52 MS 311, MS 391 Special Accessories Contact your STIHL dealer for information regarding special accessories that fit onto one tab and ...
Product Instruction Manual
Page 55
... small off -road equipment engine at an authorized dealer), parts and labor. MS 311, MS 391 53 Model Serial number Guide bar part number Chain part number See "Specifications" in materials and workmanship which cause it to fail to the ultimate purchaser. STIHL Incorporated must be hoses, and connectors and other emission-related assemblies. English... first two years of engine use from defects in this unit should carry out only the maintenance operations described in some cases, by an authorized STIHL servicing dealer using original STIHL replacement parts.
... small off -road equipment engine at an authorized dealer), parts and labor. MS 311, MS 391 53 Model Serial number Guide bar part number Chain part number See "Specifications" in materials and workmanship which cause it to fail to the ultimate purchaser. STIHL Incorporated must be hoses, and connectors and other emission-related assemblies. English... first two years of engine use from defects in this unit should carry out only the maintenance operations described in some cases, by an authorized STIHL servicing dealer using original STIHL replacement parts.
User Manual
Page 2
... 65 44 11.3 Oil Pump 66 46 11.4 Valve 67 46 48 5.1 Checking Operation 20 8. KG, 2009 1 Introduction and 6. Chain Brake 8 7.1 Ignition Timing 7.2 Preseparator 7.3 Ignition Module 9 7.4 Testing the 10 Ignition Module 11 7.5 Spark Plug Boot / 12 Ignition... 8.2 Fan housing 51 5.5 Pins 25 8.2.1 Segment 51 5.6 Chain Tensioner 25 8.3 Pawls 51 5.7 Bar Mounting Studs 26 8.4 Rope Rotor 52 8.5 Starter Rope / Grip 53 8.6 Tensioning the Rewind Spring 54 8.7 Replacing the Rewind Spring 55 RA_542_00_01_01 MS 311, MS 391 q © ANDREAS STIHL AG & Co.
... 65 44 11.3 Oil Pump 66 46 11.4 Valve 67 46 48 5.1 Checking Operation 20 8. KG, 2009 1 Introduction and 6. Chain Brake 8 7.1 Ignition Timing 7.2 Preseparator 7.3 Ignition Module 9 7.4 Testing the 10 Ignition Module 11 7.5 Spark Plug Boot / 12 Ignition... 8.2 Fan housing 51 5.5 Pins 25 8.2.1 Segment 51 5.6 Chain Tensioner 25 8.3 Pawls 51 5.7 Bar Mounting Studs 26 8.4 Rope Rotor 52 8.5 Starter Rope / Grip 53 8.6 Tensioning the Rewind Spring 54 8.7 Replacing the Rewind Spring 55 RA_542_00_01_01 MS 311, MS 391 q © ANDREAS STIHL AG & Co.
User Manual
Page 5
...and countryspecific safety regulations as well as necessary. Fuel system - do not use original STIHL replacement parts. Storing and disposing of oils and fuels Collect fuel or lubricating oil in ...damage before carrying out repairs or mounting the machine to the hose barbs, b 14. 4 MS 311, MS 391 Always install new hoses - Always use sharp-edged pliers, screwdrivers, etc. Gasoline is...push on small parts. Always wear suitable protective gloves for servicing Remove the chain sprocket cover, saw chain and guide bar before re-installing - Improper handling may appear alone on...
...and countryspecific safety regulations as well as necessary. Fuel system - do not use original STIHL replacement parts. Storing and disposing of oils and fuels Collect fuel or lubricating oil in ...damage before carrying out repairs or mounting the machine to the hose barbs, b 14. 4 MS 311, MS 391 Always install new hoses - Always use sharp-edged pliers, screwdrivers, etc. Gasoline is...push on small parts. Always wear suitable protective gloves for servicing Remove the chain sprocket cover, saw chain and guide bar before re-installing - Improper handling may appear alone on...
User Manual
Page 9
... new clutch drum Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install 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...
... new clutch drum Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install 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...