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 to operate your chain 55...Adjusting the Carburetor 37 Spark Arresting Screen in this Manual 2 Safety Precautions and Working Techniques 2 Cutting Attachment 23 Mounting the Bar and Chain 23 Tensioning the Chain 24 Checking Chain Tension 24 Fuel 25 Fueling 25 Chain Lubricant 27 Filling Chain Oil...
...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 operate your chain 55...Adjusting the Carburetor 37 Spark Arresting Screen in this Manual 2 Safety Precautions and Working Techniques 2 Cutting Attachment 23 Mounting the Bar and Chain 23 Tensioning the Chain 24 Checking Chain Tension 24 Fuel 25 Fueling 25 Chain Lubricant 27 Filling Chain Oil...
Product Instruction Manual
Page 8
... follow the procedure described in the chapter "Mounting the Bar and Chain" of injury. 6 MS 311, MS 391 If the chain becomes loose while cutting, shut off ). Never try to reduce the risk... proper condition and operation. (See the maintenance chart near the end of moisture, pitch, oil, fuel mix, grease or resin in order for you must move freely and always spring ...STIHL combination wrench or other in tightening slotted fuel filler caps. a loose boot may cause arcing that the spark plug boot is damaged, improperly adjusted or maintained, or not completely or securely assembled. STIHL...
... follow the procedure described in the chapter "Mounting the Bar and Chain" of injury. 6 MS 311, MS 391 If the chain becomes loose while cutting, shut off ). Never try to reduce the risk... proper condition and operation. (See the maintenance chart near the end of moisture, pitch, oil, fuel mix, grease or resin in order for you must move freely and always spring ...STIHL combination wrench or other in tightening slotted fuel filler caps. a loose boot may cause arcing that the spark plug boot is damaged, improperly adjusted or maintained, or not completely or securely assembled. STIHL...
Product Instruction Manual
Page 30
...hand - Every new chain has to 3 minutes. After breaking in for about 2 to be broken in the chain, check chain tension and adjust if necessary - when starting cutting work . Always disengage chain brake before accelerating engine and before starting work . High revs with chain brake 143BA024 KN...behind the hand guard, e.g. at idling speed The chain is stopped and locked when the hand guard is activated by the inertia of oil. during a 28 MS 311, MS 391 N Pull the hand guard back toward the bar nose - even if your saw chain must always throw off a small amount ...
...hand - Every new chain has to 3 minutes. After breaking in for about 2 to be broken in the chain, check chain tension and adjust if necessary - when starting cutting work . Always disengage chain brake before accelerating engine and before starting work . High revs with chain brake 143BA024 KN...behind the hand guard, e.g. at idling speed The chain is stopped and locked when the hand guard is activated by the inertia of oil. during a 28 MS 311, MS 391 N Pull the hand guard back toward the bar nose - even if your saw chain must always throw off a small amount ...
Product Instruction Manual
Page 37
..., especially at the nose and underside of wood and cutting techniques. 1 Use the adjusting screw (1) (on the bar rails. MS 311, MS 391 35 N Regularly clean the oil inlet hole (1), the oilway (2) and the bar groove (3). Turn reduce oil feed - N turn the adjusting screw clockwise. Different quantities of the groove - the cutters and tie straps will otherwise...
..., especially at the nose and underside of wood and cutting techniques. 1 Use the adjusting screw (1) (on the bar rails. MS 311, MS 391 35 N Regularly clean the oil inlet hole (1), the oilway (2) and the bar groove (3). Turn reduce oil feed - N turn the adjusting screw clockwise. Different quantities of the groove - the cutters and tie straps will otherwise...
Product Instruction Manual
Page 51
... 1 6 11 7 12 8 10 9 13 16 17 15 18 20 22 19 23 21 14 24 English 1 Shroud Lock 2 Carburetor Adjusting Screws 3 Spark Plug Boot 4 Shutter (Summer and Winter Operation) 5 Decompression Valve (Automatically Resetting) 6 Chain Brake 7 Chain Sprocket 8 Chain ...Sprocket Cover 9 Chain Catcher 10 Side Chain Tensioner 11 Bumper Spike 12 Guide Bar 13 Oilomatic Saw Chain 14 Oil Filler Cap 15 Muffler (with Spark Arresting Screen, not Fitted on all Markets) 16 Front Hand Guard 17 Front Handle... 23 Rear Handle 24 Rear Hand Guard # Serial Number 4903BA003 KN MS 311, MS 391 49
... 1 6 11 7 12 8 10 9 13 16 17 15 18 20 22 19 23 21 14 24 English 1 Shroud Lock 2 Carburetor Adjusting Screws 3 Spark Plug Boot 4 Shutter (Summer and Winter Operation) 5 Decompression Valve (Automatically Resetting) 6 Chain Brake 7 Chain Sprocket 8 Chain ...Sprocket Cover 9 Chain Catcher 10 Side Chain Tensioner 11 Bumper Spike 12 Guide Bar 13 Oilomatic Saw Chain 14 Oil Filler Cap 15 Muffler (with Spark Arresting Screen, not Fitted on all Markets) 16 Front Hand Guard 17 Front Handle... 23 Rear Handle 24 Rear Hand Guard # Serial Number 4903BA003 KN MS 311, MS 391 49
Product Instruction Manual
Page 52
... sprocket. 9 Chain Catcher Helps to reduce the risk of cutters, tie straps and drive links. 14 Oil Filler Cap For closing the oil tank. 15 Muffler (with the ignition lead. 4 Shutter (Summer and Winter Operation) With summer and ...Handle (Handlebar) Handlebar for the left hand from operator. English Definitions 1 Shroud Lock Lock for the shroud. 2 Carburetor Adjusting Screws For tuning the carburetor. 3 Spark Plug Boot Connects the spark plug with Spark Arresting Screen, not Fitted on ... when activated. 6 Chain Brake A device to the operator's hands. (not illustrated) 50 MS 311, MS 391
... sprocket. 9 Chain Catcher Helps to reduce the risk of cutters, tie straps and drive links. 14 Oil Filler Cap For closing the oil tank. 15 Muffler (with the ignition lead. 4 Shutter (Summer and Winter Operation) With summer and ...Handle (Handlebar) Handlebar for the left hand from operator. English Definitions 1 Shroud Lock Lock for the shroud. 2 Carburetor Adjusting Screws For tuning the carburetor. 3 Spark Plug Boot Connects the spark plug with Spark Arresting Screen, not Fitted on ... when activated. 6 Chain Brake A device to the operator's hands. (not illustrated) 50 MS 311, MS 391
Product Instruction Manual
Page 57
... fuel-oil MS 311, MS 391 55 Air Filter - Fuel Pump - Clamps - Deviations from this manual are based on the application of fuel and oil may require shorter maintenance intervals. Limitations This Emission Control Systems Warranty shall not cover any authorized STIHL servicing dealer and present the signed warranty card. damages to other services and adjustments necessary...
... fuel-oil MS 311, MS 391 55 Air Filter - Fuel Pump - Clamps - Deviations from this manual are based on the application of fuel and oil may require shorter maintenance intervals. Limitations This Emission Control Systems Warranty shall not cover any authorized STIHL servicing dealer and present the signed warranty card. damages to other services and adjustments necessary...
User Manual
Page 6
...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... gap: 0.20...0.30 mm NGK BPMR 7 A BOSCH WSR6F 0.5 mm Speed-controlled oil pump with reciprocating piston and manual flow control Oil delivery rate: Ematic oil pump 11.5 (+2.5) cm3/min at 10,000 rpm Oil delivery rate: Adjustable oil pump 6.0 (+/-2.0)...17.5 (+3.0 / -4.5) cm3/min at 10,000 rpm 5 2.
...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... gap: 0.20...0.30 mm NGK BPMR 7 A BOSCH WSR6F 0.5 mm Speed-controlled oil pump with reciprocating piston and manual flow control Oil delivery rate: Ematic oil pump 11.5 (+2.5) cm3/min at 10,000 rpm Oil delivery rate: Adjustable oil pump 6.0 (+/-2.0)...17.5 (+3.0 / -4.5) cm3/min at 10,000 rpm 5 2.
User Manual
Page 11
... 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 . rectify other sources of faults before disassembling the oil pump. 3.3 Chain Lubrication In the event of trouble with adjustable oil pump) 10 MS 311, MS 391
... 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 . rectify other sources of faults before disassembling the oil pump. 3.3 Chain Lubrication In the event of trouble with adjustable oil pump) 10 MS 311, MS 391
User Manual
Page 13
...fit new spring if necessary Spark plug sooted, smeared with oil Clean the spark plug or replace if necessary. Clean the spark plug or replace if necessary. Engine housing damaged (cracks) Install new engine housing 12 MS 311, MS 391 If sooting keeps recurring, check air filter Ignition lead...the ignition system. too much oil Use correct mixture of fuel and oil Incorrect air gap between ignition Set air gap correctly module and flywheel Flywheel cracked or damaged or pole shoes have turned blue Install new flywheel Ignition timing out of adjustment, flywheel warped, machined key in...
...fit new spring if necessary Spark plug sooted, smeared with oil Clean the spark plug or replace if necessary. Clean the spark plug or replace if necessary. Engine housing damaged (cracks) Install new engine housing 12 MS 311, MS 391 If sooting keeps recurring, check air filter Ignition lead...the ignition system. too much oil Use correct mixture of fuel and oil Incorrect air gap between ignition Set air gap correctly module and flywheel Flywheel cracked or damaged or pole shoes have turned blue Install new flywheel Ignition timing out of adjustment, flywheel warped, machined key in...
User Manual
Page 29
...between the two screws. - Remove the carburetor, b 12.5 28 MS 311, MS 391 Such faults allow supplementary air to enter the engine and upset the fuel-air mixture. 6.2.1 Preparations 1 1 1 4903RA053 TG This makes adjustment of leaks. Moreover, the transition from idle speed to top dead center.... The engine can be checked thoroughly for leaks with the pump 0000 850 1300. 2 - 6.2 Leakage Test Defective oil seals and gaskets or cracks in castings are...
...between the two screws. - Remove the carburetor, b 12.5 28 MS 311, MS 391 Such faults allow supplementary air to enter the engine and upset the fuel-air mixture. 6.2.1 Preparations 1 1 1 4903RA053 TG This makes adjustment of leaks. Moreover, the transition from idle speed to top dead center.... The engine can be checked thoroughly for leaks with the pump 0000 850 1300. 2 - 6.2 Leakage Test Defective oil seals and gaskets or cracks in castings are...
User Manual
Page 68
...the valve in position. : Fit and tighten down the screws (2) firmly. - Use a 6 mm drift to the oil pump. - Reassemble all other parts in the housing and into the oil tank. 1 219RA479 TG 4903RA270 TG : Fit the cover washer (1) so that the word TOP (arrow) faces outwards. ... valve out of oil pump and readjust if necessary - Open the oil tank cap and drain the oil tank b 1. 4903RA184 TG - see instruction manual. 1 : Remove the old valve (1) from outside - MS 311, MS 391 67 4903RA186 TG 1 2 2 11.4 Valve Installing A valve is faulty. - Check adjustment of its seat ...
...the valve in position. : Fit and tighten down the screws (2) firmly. - Use a 6 mm drift to the oil pump. - Reassemble all other parts in the housing and into the oil tank. 1 219RA479 TG 4903RA270 TG : Fit the cover washer (1) so that the word TOP (arrow) faces outwards. ... valve out of oil pump and readjust if necessary - Open the oil tank cap and drain the oil tank b 1. 4903RA184 TG - see instruction manual. 1 : Remove the old valve (1) from outside - MS 311, MS 391 67 4903RA186 TG 1 2 2 11.4 Valve Installing A valve is faulty. - Check adjustment of its seat ...
User Manual
Page 89
... vent Adjusting air gap between the ignition module and flywheel Removing and installing piston pin Attaching springs Protecting the oil seal Installing oil seal Protecting the oil seal (clutch side) Spark plug 1) Removing flywheel Testing ignition system Testing ignition system 0.5 to 18 Nm 6 to 80 Nm Installing hookless snap rings in piston 88 MS 311, MS 391...
... vent Adjusting air gap between the ignition module and flywheel Removing and installing piston pin Attaching springs Protecting the oil seal Installing oil seal Protecting the oil seal (clutch side) Spark plug 1) Removing flywheel Testing ignition system Testing ignition system 0.5 to 18 Nm 6 to 80 Nm Installing hookless snap rings in piston 88 MS 311, MS 391...
User Manual
Page 90
... Add-on for screwdriver (adjusting carburetor) IS-P screws (4 mm) Detaching springs on clutch shoes Holding machines for releasing only. Description 20 Screwdriver - No. Remarks: 1) Use for repairs Removing oil seals Removing oil seal(s) Removing limiter caps Removing bar mounting studs Removing and installing decompression valve Removing pickup body Rem. MS 311, MS 391 89 Setting disk...
... Add-on for screwdriver (adjusting carburetor) IS-P screws (4 mm) Detaching springs on clutch shoes Holding machines for releasing only. Description 20 Screwdriver - No. Remarks: 1) Use for repairs Removing oil seals Removing oil seal(s) Removing limiter caps Removing bar mounting studs Removing and installing decompression valve Removing pickup body Rem. MS 311, MS 391 89 Setting disk...