Product Instruction Manual
Page 3
...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. Warning! As a result, engineering changes and...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.
...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. Warning! As a result, engineering changes and...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.
Product Instruction Manual
Page 4
... operation of your machine differ from time to an illustration may contain paragraphs that are generally observed when working with the symbols and signal words described below: Danger! Warning! Indicates an imminent risk of Federal Regulations 1910.266. 2 MS 311, MS ...391 Reactive forces, including kickback, can be covered in the illustration. All safety precautions that require your STIHL dealer show you read, fully understand and observe the following safety precautions and warnings. N Lever (2) ... Symbols in this manual. Example: N Loosen...
... operation of your machine differ from time to an illustration may contain paragraphs that are generally observed when working with the symbols and signal words described below: Danger! Warning! Indicates an imminent risk of Federal Regulations 1910.266. 2 MS 311, MS ...391 Reactive forces, including kickback, can be covered in the illustration. All safety precautions that require your STIHL dealer show you read, fully understand and observe the following safety precautions and warnings. N Lever (2) ... Symbols in this manual. Example: N Loosen...
Product Instruction Manual
Page 5
... transport, as well as high vibration levels and long periods of these safety precautions and warnings apply to reduce the transmission of all STIHL chain saws. Different models may be in good physical condition and mental health and not under the influence of any substance (drugs,... operating this machine. Do not use of your model. In order to use of whitefinger disease and carpal tunnel syndrome, please note the following: - Keep the MS 311, MS 391 3 Minors should not be aggravated by the machine to property, never let your power tool without the instruction manual....
... transport, as well as high vibration levels and long periods of these safety precautions and warnings apply to reduce the transmission of all STIHL chain saws. Different models may be in good physical condition and mental health and not under the influence of any substance (drugs,... operating this machine. Do not use of your model. In order to use of whitefinger disease and carpal tunnel syndrome, please note the following: - Keep the MS 311, MS 391 3 Minors should not be aggravated by the machine to property, never let your power tool without the instruction manual....
Product Instruction Manual
Page 7
...fueling and move at a 90° angle. MS 311, MS 391 5 To reduce the risk of your body and the cutting attachment behind you. Gasoline vapor pressure may escape from your instruction manual). Different models may be equipped with this STIHL cap, raise the grip on the fuel tank ...weather conditions and the tank venting system. Gasoline is upright at least 10 feet (3 m) from saw chain moving. Warning! Do not continue operating this happens, change your power tool in a horizontal position. It may be carried only in well-ventilated areas, outdoors. a quarter turn...
...fueling and move at a 90° angle. MS 311, MS 391 5 To reduce the risk of your body and the cutting attachment behind you. Gasoline vapor pressure may escape from your instruction manual). Different models may be equipped with this STIHL cap, raise the grip on the fuel tank ...weather conditions and the tank venting system. Gasoline is upright at least 10 feet (3 m) from saw chain moving. Warning! Do not continue operating this happens, change your power tool in a horizontal position. It may be carried only in well-ventilated areas, outdoors. a quarter turn...
Product Instruction Manual
Page 8
... position. Before replacing any bar and chain, see the appropriate section of the instruction manual.) Warning! Never start the engine at all times; Warning! STIHL Oilomatic chain, guide bar and sprocket must match each other similar tool can cause an...MS 311, MS 391 Warning! Check that could ignite combustible fumes and cause a fire. Keep the handles clean and dry at least 10 feet (3 meters) from the fueling spot, outdoors only. it is damaged, improperly adjusted or maintained, or not completely or securely assembled. Start and operate your instruction manual...
... position. Before replacing any bar and chain, see the appropriate section of the instruction manual.) Warning! Never start the engine at all times; Warning! STIHL Oilomatic chain, guide bar and sprocket must match each other similar tool can cause an...MS 311, MS 391 Warning! Check that could ignite combustible fumes and cause a fire. Keep the handles clean and dry at least 10 feet (3 meters) from the fueling spot, outdoors only. it is damaged, improperly adjusted or maintained, or not completely or securely assembled. Start and operate your instruction manual...
Product Instruction Manual
Page 9
... the chain brake before starting throttle lock and allow the engine to settle down to start . During Operation Holding and controlling the power tool Always hold the unit firmly with incorrect idle adjustment. To reduce the...kickback to rewind it on reactive forces). When you cannot set the correct idle speed, have your STIHL dealer check your arm on the ground. Keep your power tool and make proper adjustments and repairs...guide bar and chain are clear of your instruction manual. MS 311, MS 391 7 If you pull the starter grip, do not use your left hand and press down ....
... the chain brake before starting throttle lock and allow the engine to settle down to start . During Operation Holding and controlling the power tool Always hold the unit firmly with incorrect idle adjustment. To reduce the...kickback to rewind it on reactive forces). When you cannot set the correct idle speed, have your STIHL dealer check your arm on the ground. Keep your power tool and make proper adjustments and repairs...guide bar and chain are clear of your instruction manual. MS 311, MS 391 7 If you pull the starter grip, do not use your left hand and press down ....
Product Instruction Manual
Page 14
... angle when equipped with the standard for use on your STIHL chain saw. 12 MS 311, MS 391 must, in real life cutting situations. Compliance with a displacement of injury in ...the saw to actual kickback bar rotation angles that in the occurrence and force of the instruction manual or - Do not use of ANSI standard B 175.1-2000, sets certain performance and design... on your local STIHL servicing dealer. STIHL recommends the use the saw kickback standard § 5.11 of reduced kickback bars and low kickback chains. In order for the operator to reduce the ...
... angle when equipped with the standard for use on your STIHL chain saw. 12 MS 311, MS 391 must, in real life cutting situations. Compliance with a displacement of injury in ...the saw to actual kickback bar rotation angles that in the occurrence and force of the instruction manual or - Do not use of ANSI standard B 175.1-2000, sets certain performance and design... on your local STIHL servicing dealer. STIHL recommends the use the saw kickback standard § 5.11 of reduced kickback bars and low kickback chains. In order for the operator to reduce the ...
Product Instruction Manual
Page 15
...your chain brake as described in certain kickback situations. No Quickstop or other parts of your body. The matching of your instruction manual. If the kickback forces are sufficiently high, the hand guard is pinched or otherwise caught in the cut. These devices are ...of ANSI B 175.1-2000 MS 311, MS 391 13 Never run the chain saw equipped with the computed kickback angle requirements of the motor housing, clutch and oiler component and may rotate around the front handle and makes a sufficiently forceful contact with the operator. STIHL has developed a color code...
...your chain brake as described in certain kickback situations. No Quickstop or other parts of your body. The matching of your instruction manual. If the kickback forces are sufficiently high, the hand guard is pinched or otherwise caught in the cut. These devices are ...of ANSI B 175.1-2000 MS 311, MS 391 13 Never run the chain saw equipped with the computed kickback angle requirements of the motor housing, clutch and oiler component and may rotate around the front handle and makes a sufficiently forceful contact with the operator. STIHL has developed a color code...
Product Instruction Manual
Page 23
... the operator of a sawhorse. Use of the log. shaped supports on the uphill side of non-STIHL parts may deny coverage. 001BA151 KN Warning! 2 Use only identical STIHL replacement ... not roll downhill. Warning! Strictly follow the maintenance and 2 repair instructions in 1 this manual. 001BA152 KN When cutting small logs, place log through "V" - Never permit another person to... remove it from the log. MS 311, MS 391 21 English maintained properly or if nonapproved replacement parts were 1 used to hold the log with your STIHL servicing dealer only. Never hold ...
... the operator of a sawhorse. Use of the log. shaped supports on the uphill side of non-STIHL parts may deny coverage. 001BA151 KN Warning! 2 Use only identical STIHL replacement ... not roll downhill. Warning! Strictly follow the maintenance and 2 repair instructions in 1 this manual. 001BA152 KN When cutting small logs, place log through "V" - Never permit another person to... remove it from the log. MS 311, MS 391 21 English maintained properly or if nonapproved replacement parts were 1 used to hold the log with your STIHL servicing dealer only. Never hold ...
Product Instruction Manual
Page 24
... the risk of the proper size. (Note: If terminal has detachable SAE adapter nut, it inoperable. Warning! If your STIHL chain saw in hot or dry weather. For the proper and effective operation of the chain brake, the brake band and clutch drum must be kept free of the chain brake and... the specified spark plug and make sure it and the ignition lead are always clean and in the instruction manual). 22 MS 311, MS 391 English Warning! Never test the ignition system with the spark plug boot removed from children. Remember that could ignite combustible fumes and cause a fire. ...
... the risk of the proper size. (Note: If terminal has detachable SAE adapter nut, it inoperable. Warning! If your STIHL chain saw in hot or dry weather. For the proper and effective operation of the chain brake, the brake band and clutch drum must be kept free of the chain brake and... the specified spark plug and make sure it and the ignition lead are always clean and in the instruction manual). 22 MS 311, MS 391 English Warning! Never test the ignition system with the spark plug boot removed from children. Remember that could ignite combustible fumes and cause a fire. ...
Product Instruction Manual
Page 53
additional manual oil flow control Oil tank capacity: 11.8 oz (0.350 l) Weight English dry, without bar and chain MS 311: 14.1 lbs. (6.4 kg) MS 391: 14.1 lbs. (6.4 kg) Cutting attachment Recommended cutting attachments in compliance with green label) Rapid Micro Comfort 3 (33 RMC3) Rapid ...Pitch: 3/8" (9.32 mm) Drive link gauge: 0.050 in. (1.3 mm) or 0.063 in. (1.6 mm) MS 311, MS 391 51 or 11-tooth Saw chains 3/8" STIHL reduced kickback saw chains (with Sec. 5.11 of operating hours for which the engine has been shown to ISO 7293: 4.4 hp (3.3 kW) at 9500 rpm Idle speed...
additional manual oil flow control Oil tank capacity: 11.8 oz (0.350 l) Weight English dry, without bar and chain MS 311: 14.1 lbs. (6.4 kg) MS 391: 14.1 lbs. (6.4 kg) Cutting attachment Recommended cutting attachments in compliance with green label) Rapid Micro Comfort 3 (33 RMC3) Rapid ...Pitch: 3/8" (9.32 mm) Drive link gauge: 0.050 in. (1.3 mm) or 0.063 in. (1.6 mm) MS 311, MS 391 51 or 11-tooth Saw chains 3/8" STIHL reduced kickback saw chains (with Sec. 5.11 of operating hours for which the engine has been shown to ISO 7293: 4.4 hp (3.3 kW) at 9500 rpm Idle speed...
Product Instruction Manual
Page 55
...only the maintenance operations described in the spaces provided. STIHL Incorporated must be performed only by an authorized STIHL servicing dealer using original STIHL replacement parts. Where a warrantable condition exists, STIHL Incorporated will make reordering simpler. The guide bar and saw chain in this manual for small non... has been performed by authorized STIHL service shops. Also included may appear alone on your small off -road engine for the period of time listed below provided there has been no cost to normal wear and tear. MS 311, MS 391 53 Other repair work...
...only the maintenance operations described in the spaces provided. STIHL Incorporated must be performed only by an authorized STIHL servicing dealer using original STIHL replacement parts. Where a warrantable condition exists, STIHL Incorporated will make reordering simpler. The guide bar and saw chain in this manual for small non... has been performed by authorized STIHL service shops. Also included may appear alone on your small off -road engine for the period of time listed below provided there has been no cost to normal wear and tear. MS 311, MS 391 53 Other repair work...
User Manual
Page 4
... considerably easier if the machine is already fitted. MS 311, MS 391 3 The special tools mentioned in the descriptions are listed in the chapter on the machine may damage housings when the machine is not shown in the "STIHL Special Tools" manual. chapter 4.2 in the illustration above operation is issued. The above the text - Refer to...
... considerably easier if the machine is already fitted. MS 311, MS 391 3 The special tools mentioned in the descriptions are listed in the chapter on the machine may damage housings when the machine is not shown in the "STIHL Special Tools" manual. chapter 4.2 in the illustration above operation is issued. The above the text - Refer to...
User Manual
Page 5
...-installing - Spilled fuel must be wiped away immediately. Always perform leakage test after removal. Preparations for operations in position - Improper handling may result in this service manual. Check disassembled parts for assembly or disassembly. replace as the safety precautions and warnings in accordance with... oil in a clean container and dispose of STIHL press fluid, b 14. hose barb connectors Pull off or push on small parts. Do not re-use fuel hoses after working on to the hose barbs, b 14. 4 MS 311, MS 391 They can be performed outdoors only. The...
...-installing - Spilled fuel must be wiped away immediately. Always perform leakage test after removal. Preparations for operations in position - Improper handling may result in this service manual. Check disassembled parts for assembly or disassembly. replace as the safety precautions and warnings in accordance with... oil in a clean container and dispose of STIHL press fluid, b 14. hose barb connectors Pull off or push on small parts. Do not re-use fuel hoses after working on to the hose barbs, b 14. 4 MS 311, MS 391 They can be performed outdoors only. The...
User Manual
Page 6
...chain: Idle speed: Clutch: Clutch engages at: Engine housing leakage test at gauge pressure: under vacuum: 2.2 Fuel System 2.3 Ignition System 2.4 Chain Lubrication MS 311, MS 391 MS 311 59 cm3 47 mm 34 mm 3 kW (4 bhp) at 9,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm 0.5 ... 0.5 bar MS 391 64.1 cm3 49 mm 34 mm 3.2 kW (4.4 bhp) at 9,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm Carburetor leakage test at gauge pressure: Operation of tank vent at gauge pressure: Fuel: 0.8 bar 0.5 bar as specified in instruction manual Air gap between...
...chain: Idle speed: Clutch: Clutch engages at: Engine housing leakage test at gauge pressure: under vacuum: 2.2 Fuel System 2.3 Ignition System 2.4 Chain Lubrication MS 311, MS 391 MS 311 59 cm3 47 mm 34 mm 3 kW (4 bhp) at 9,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm 0.5 ... 0.5 bar MS 391 64.1 cm3 49 mm 34 mm 3.2 kW (4.4 bhp) at 9,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm Carburetor leakage test at gauge pressure: Operation of tank vent at gauge pressure: Fuel: 0.8 bar 0.5 bar as specified in instruction manual Air gap between...
User Manual
Page 21
...machine. Remove the clutch drum, b 4.1 - The brake band is one of the brake band. 20 MS 311, MS 391 With the chain brake activated (locked), open the throttle wide and activate the brake manually - With the chain brake released, open the 1 1 throttle wide for a brief period (max. 3... and the saw chain (less than a second) is in terms of friction, which prolongs the braking time. If the chain brake does not operate properly, refer to a complete standstill. - Troubleshooting, b 3.2 1 4903RA016 TG Contamination (with chain oil, chips, fine particles of abrasion, etc...
...machine. Remove the clutch drum, b 4.1 - The brake band is one of the brake band. 20 MS 311, MS 391 With the chain brake activated (locked), open the throttle wide and activate the brake manually - With the chain brake released, open the 1 1 throttle wide for a brief period (max. 3... and the saw chain (less than a second) is in terms of friction, which prolongs the braking time. If the chain brake does not operate properly, refer to a complete standstill. - Troubleshooting, b 3.2 1 4903RA016 TG Contamination (with chain oil, chips, fine particles of abrasion, etc...