STIHL MS 311, 391
Contents
1. em a 001BA203 KN STIHL filing gauge special accessory see table Sharpening tools a universal tool for checking sharpening and side plate angles depth gauge setting and tooth length as well as cleaning grooves and oil inlet holes Proper sharpening e Select sharpening tools in accordance with chain pitch Clamp guide bar if necessary e Block saw chain push the hand guard forward e To advance the saw chain pull the hand guard toward the handlebar The chain brake is disengaged With the Quickstop Super chain brake system additionally press the throttle trigger lockout Sharpen frequently removing little material two or three strokes of the file are usually sufficient for simple resharpening English 689BA018 KN x o Y SQ lt ao D e Guide the file horizontally at a right angle to the side surface ofthe guide bar in accordance with the specified angle according to the markings on the file holder rest the file holder on the tooth head and the depth gauge File only from the inside outward e The file only sharpens on the forward stroke lift the file on the backstroke e Do not file tie straps and drive links Rotate the file a little periodically in order to avoid uneven wear e To remove file burr use a piece of hardwood e Check angle with file gauge All cutters must be equally long 35 English With varying cutter le2. Never operate your unit with one hand English Begin cutting with the saw at full throttle and engage the spiked bumper firmly in the wood and then continue cutting Never work without the spiked bumper because the saw may pull you forwards and off balance Always hold the spiked bumper securely against the tree or limb Note when reaching the end of a cut that the saw is no longer supported in the kerf You have to take the full weight of the saw since it might otherwise go out of control Felling Do not attempt felling unless you have been trained in the necessary techniques To reduce the risk of accidents and injury do not attempt felling or limbing if you are not an experienced chain saw user Observe all country specific regulations on felling techniques Check that there are no other persons in the felling area other than helpers Make sure no one is endangered by the falling tree the noise of your engine may drown any warning calls lt a o o lt a x o o Maintain a distance of at least 2 1 2 tree lengths from the next felling site Determine direction of fall and escape paths Select gap in stand into which you want the tree to fall Pay special attention to the following points The natural lean of the tree Any unusually heavy limb structure damage The wind direction and speed do not fell in high winds Sloping ground Neighboring trees
3. Snow load Soundness of tree take special care if trunk is damaged or in case of deadwood dry decayed or rotted wood z x o y 3 lt ao 3 o A Direction of fall B Escape paths Establish paths of escape for everyone concerned opposite to direction of fall at about 45 Remove all obstacles from escape paths Place all tools and equipment a safe distance away from the tree but not on the escape paths Always keep to the side of the falling tree and only walk away along the preplanned escape path On steep slopes plan escape routes parallel to the slope When walking away along the escape path watch out for falling limbs and watch the top of the tree Preparing work area at base of tree First clear the tree base and work area from interfering limbs and brush to provide a secure footing Clean lower portion of tree base e g with an axe sand stones and other foreign objects will dull the saw chain TAR na ld le ES z g lt a 3 S Remove large buttress roots Make the vertical cut first then the horizontal but only if the wood is sound MS 311 MS 391 Felling notch z g an wo lt ao 3 o When making the felling notch make use of the gunning sight on the shroud and fan housing to check the planned direction of fall Position your saw so that the gunning sight points in exactly the direction you want
4. 1 consisting of file holder with round file taper square file and file gauge MS 311 MS 391 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 5605 007 1027 5605 007 1027 5605 007 1028 5605 007 1029 5605 007 1030 37 English Maintenance and Care The following intervals apply to normal operating conditions only If your daily work 5 ing time is longer or operating conditions are difficult very dusty work area resin T a rich wood tropical wood etc shorten the specified intervals accordingly If you only E use the saw occasionally extend the intervals accordingly x z gt Wie e E oga E jo Sloe Nag gt s 8 2 lt re El 5 z 5 gt 9 E gt D 2 2 D o 2 a hoj 2 a E Visual inspection condition leaks x x Complete machine Clean x Throttle trigger trigger interlock Master Check operation X X Control Check operation x x Chain brake Have checked by servicing dealer x Check Pickup body filter in fuel tank Clean replace filter element x Replace x x x Fuel tank Clean Chain oil tank Clean Chain lubrication Check Inspect also check sharpness Saw chain Check chain tension Sharpen x Check wear damage x Clean and turn over x Guide bar Deburr x Replace x x Chain sprocket Check x Clean x x Air filter Replace x Check x x Antivibration e
5. Inches mm 1 4 or 1 1 4 6 35 P PMor6 3 8P 9 32 325 or 2 0 325 8 25 3 8 or 3 3 8 9 32 404 or 4 0 404 10 26 Use only special saw chain files Other files are unsuitable in terms of shape and type of cutting The diameter of file to be used depends on the chain pitch see table Sharpening tools The angles of the cutter must be maintained during resharpening x a e lt ao Q A Sharpening angle B Side plate angle MS 311 MS 391 Chain Type Angle A B Rapid Micro RM 30 75 Rapid Super RS 30 60 Picco Micro PM 30 75 Rapid Micro X RMX rip 10 75 ping chain Picco Micro X PMX rip 10 75 ping chain Tooth shapes Micro semi chisel tooth Super chisel tooth When the specified files and or sharpening tools and the proper setting are used the specified values for angles A and B will be attained automatically The angles must be identical for all cutters in the saw chain Varying angles Rough uneven running of the saw chain increased wear even to the point of saw chain breakage zZ x Lo A o lt a D Because these requirements can be met only after sufficient constant practice e Use a file holder Always use a file holder special accessory see table Sharpening tools when sharpening saw chains by hand File holders have markings for the sharpening angle MS 311 MS 391 To check the angles 85 75 Yi U 80 Ne SZ o IS
6. accordance with local environmental requirements Fit new chain sprocket e Run the engine until the carburetor is dry this helps prevent the carburetor diaphragms sticking together Remove the saw chain and guide z bar clean them and spray with N corrosion inhibiting oil g Thoroughly clean the machine 5 3 pay special attention to the cylinder 3 Use a screwdriver to remove the E fins and air filter after use of two saw chains or clip 1 e Ifyou use a biological chain and bar earlier Remove the washer 2 eal val ER if the wear marks arrows are Remove rim sprocket 3 y fi in oi E ER 0 Fa an ee the Inspect transport profile on the e Store the machine in a dry high or Se Oe TE OT e ALLE clutch drum 4 if there are also locked location out of the reach of children and other unauthorized persons reduced use check gauge special accessory to test heavy signs of wear also replace the clutch drum Using two saw chains in alternation R lutch d hai helps preserve the chain sprocket s PS ee ee sprocket 5 including needle cage 6 from the crankshaft with QuickStop Super chain brake press throttle lock beforehand STIHL recommends use of original STIHL chain sprockets in order to ensure optimal functioning of the chain brake MS 311 MS 391 33 English Install spur chain sprocket rim sprocket Clean crankshaft stub and needle cage and lubricate with STIHL lubrican
7. lt Q oO o a x e Rectify the problems which have Loosen screws 1 caused fouling of the spark plug Remove the shroud 2 Possible causes are Too much oil in fuel mix Dirty air filter Unfavorable running conditions 30 4903BA007 KN 000BA039 KN 000BA045 KN If the spark plug comes with a detachable adapter nut 1 screw the adapter onto the thread and tighten it down firmly to reduce the risk of arcing and fire Install spark plug x S lt a 2 a e Screw in the spark plug and press on the spark plug boot e Refit the shroud and tighten the screws MS 311 MS 391 Replacing the Starter Rope and Rewind Spring Remove shroud Move the Master Control lever to the stop position 0 e Push the hand guard forwards the saw chain is blocked 4903BA002 KN e Loosen screws 1 Remove the shroud 2 Removing the fan housing BERGEN CE GG en E Oo Remove screws 1 e Push hand guard upward Pull the bottom of the fan housing away from the crankcase and remove downwards MS 311 MS 391 Replace torn starter rope 001BA096 KN Carefully press the spring clip 2 off of the axle with a screw driver or suitable pliers Carefully remove the rope rotor with washer 3 and pawls 4 The rewind spring can jump out risk of injury Lever the rope out of the starter handle with a screwdr
8. LA 0001BA008 KN Shut off the engine Check the air filter and clean or replace if necessary e Check the spark arresting screen country specific in the muffler and clean or replace if necessary MS 311 MS 391 e Turn the high speed screw H counterclockwise as far as stop no more than 3 4 turn e Turn the low speed screw L carefully clockwise as far as stop then turn it back 1 full turn Adjusting idle speed Engine stops while idling Open the low speed screw L one full turn e Turn the idle speed screw LA clockwise until the chain begins to run then back it off 1 1 2 turns Chain runs when engine is idling Open the low speed screw L one full turn e Turn the idle speed screw LA counterclockwise until the chain begins to run then turn it another 1 1 2 turns in the same direction If the chain continues moving when the engine is idling have your saw checked and repaired by your servicing dealer Erratic idling behavior poor acceleration even though low speed screw is open one turn e idle setting is too lean Turn the low speed screw L counterclockwise until the engine runs and accelerates smoothly It is usually necessary to change the setting of the idle speed screw LA after every correction to the low speed screw L MS 311 MS 391 Fine tuning for operation at high altitude A slight correction of the setting may be necessary if the engine doe
9. broken in for about 2 to 3 minutes After breaking in the chain check chain tension and adjust if necessary see Checking Chain Tension 19 English Chain Brake NO Locking the chain 143BA011 KN in an emergency when starting atidling speed The chain brake is activated by pushing the hand guard toward the bar nose with your left hand or by inertia in certain kickback situations The chain is stopped and locked 20 Releasing the chain brake z S a 2 lt ao 7 t e Pullthe hand guard back toward the front handle FS Always disengage chain brake before accelerating the engine except when checking its operation and before starting cutting work High revs with the chain brake engaged chain locked will quickly damage the powerhead and chain drive clutch chain brake The chain brake is also activated by the inertia of the front hand guard if the kickback force of the saw is high enough The hand guard is accelerated toward the bar nose even if your left hand is not behind the hand guard e g during felling cut The chain brake will operate only if the hand guard has not been modified in any way Check operation of the chain brake Before starting work Run engine at idle speed engage the chain brake push hand guard toward bar nose and open the throttle wide for no more than 3 seconds the chain must not rotate The hand guard must be free f
10. gasoline 16 FS A few tankfuls of leaded gasoline will greatly reduce the efficiency of the catalytic converter Engine Oil Use only quality two stroke engine oil We recommend STIHL two stroke engine oil since it is specially formulated for use in STIHL engines and guarantees a long engine life If STIHL two stroke engine oil is not available use only quality two stroke oil designed for use in air cooled engines Do not use oils designed for water cooled engines or engines with a separate lubricating system e g conventional four stroke engines Use only STIHL 50 1 two stroke engine oil for the fuel mix in models with a catalytic converter Mix Ratio STIHL 50 1 two stroke engine oil 50 parts gasoline to 1 part oil Examples Gasoline STIHL engine oil 50 1 Liters Liters ml 1 0 02 20 5 0 10 100 10 0 20 200 15 0 30 300 20 0 40 400 25 0 50 500 Fo Other brand name two stroke engine oils 25 parts gasoline to 1 part oil e Use a canister approved for storing fuel Pour oil into canister first then add gasoline and mix thoroughly Storing Fuel Store fuel only in approved safety type fuel canisters in a dry cool and safe location protected from light and the sun Fuel mix ages only mix sufficient fuel for a few weeks work Do not store fuel mix for longer than 3 months Exposure to light the sun low or high temperatures can quickly make the fuel mix unusable e Thor
11. hot muffler away from easily combustible materials e g wood chips bark dry grass fuel Mufflers with a catalytic converter can become particularly hot MS 311 MS 391 Your power tool produces toxic exhaust fumes as soon as the engine is running These fumes may be colorless and odorless and contain unburned hydrocarbons and benzol Never run the engine indoors or in poorly ventilated loca tions even if your model is equipped with a cata lytic converter To reduce the risk of serious or fatal injury from breathing toxic fumes ensure proper ventilation when working in trenches hollows or other confined locations To reduce the risk of accidents stop work immediately in the event of nausea headache visual disturbances e g reduced field of vision problems with hearing dizziness deterioration in ability to concentrate Apart from other possibilities these symptoms may be caused by an excessively high concentration of exhaust gases in the work area The dusts e g sawdust vapor and smoke produced during operation may be dangerous to health If dust levels are very high wear a suitable respirator Check the saw chain at regular short intervals during operation or immediately if there is a noticeable change in cutting behavior Shutoff the engine and wait until the chain comes to a complete stanstill Check condition Check sharpness English Do not touch the chain while the en
12. large Use a low kickback chain and a narrow radius guide bar Pull in A 001BA037 KN Pull in occurs when the chain on the bottom of the bar is suddenly pinched caught or encounters a foreign object in the wood The reaction of the chain pulls the saw forward always hold the spiked bumper securely against the tree or limb MS 311 MS 391 Pushback B zZ 8 S lt ao 3 S Pushback occurs when the chain on the top of the bar is suddenly pinched caught or encounters a foreign object in the wood The reaction of the chain drives the saw straight back toward the operator To avoid pushback Bealertto situations that may cause the top of the guide bar to be pinched Do not twist the guide bar in the cut Exercise extreme caution with leaners with trees that have fallen unfavorably between other trees and are under strain when working in blowdown areas Do not work with the chainsaw in such circumstances Use block and tackle cable winch or tractor Pull out exposed and cleared logs Select clear area for cutting Deadwood dry decayed or rotted wood represents a considerable risk that is difficult to assess Identifying the extent of the dangers is complicated if not impossible Use aids such as a cable winch or tractor in such cases MS 311 MS 391 When felling in the vicinity of roads railways power lines etc take extra precaution
13. lever was moved from the position starting acceleration to the stop position 0 afterwards simultaneously press the throttle trigger lockout and the throttle trigger If the engine does not start The Master Control lever was not returned from the position choke shutter closed to starting acceleration xl in time the engine may be flooded Move the Master Control lever to the stop position 0 Remove the spark plug see Spark plug Dry spark plug e Crank the engine several times with the starter to clear the combustion chamber e Replace the spark plug see Spark plug e Set the Master Control lever to starting acceleration x even if the engine is cold MS 311 MS 391 e Press the button on the decompression valve e Restart the engine MS 311 MS 391 Operating Instructions During the break in period A factory new machine should not be run at high revs full throttle off load for the first three tank fillings This avoids unnecessarily high loads during the break in period As all moving parts have to bed in during the break in period the frictional resistances in the shortblock are greater during this period The engine develops its maximum power after about 5 to 15 tank fillings During work fo Do not make the mixture leaner to achieve an apparent increase in power this could damage the engine see Adjusting the Carburetor FS Open the throttle only wh
14. not attempt to start the saw when the saw chain is in a cut Holding and Controlling the Power Tool Always hold your saw firmly with both hands Right hand on the rear handle even if you are left handed To ensure safe control wrap your fingers tightly around the front and rear handles During Operation Make sure you always have good balance and secure footing MS 311 MS 391 In the event of impending danger or in an emergency switch off the engine immediately by moving the Master Control lever stop switch to STOP or 0 Your power tool is designed to be operated by one person only Do not allow other persons in the work area Never leave a running machine unattended When the engine is running Note that the chain continues to rotate for a short period after you let go of the throttle trigger flywheel effect Take special care in slippery conditions damp snow ice on slopes uneven ground and freshly debarked logs Watch out for obstacles such as tree stumps roots and ditches which could cause you to trip or stumble Do not work alone keep within calling distance of others in case help is needed Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings shouts alarms etc is restricted To reduce the risk of accidents take a break in good time to avoid tiredness or exhaustion To reduce risk of fire keep hot exhaust gases and
15. the tree to fall There are several approved methods for making the felling notch observe country specific regulations on felling techniques MS 311 MS 391 001BA143 KN The felling notch C determines the direction of fall STIHL recommends the following method e Make the horizontal cut check the direction of fall with the gunning sight e Make angle cut at about 45 e Check the felling notch and correct it if necessary Important Felling notch at a right angle to the planned direction of fall As close to the ground as possible Cut to a depth of about 1 5 to 1 3 of the trunk diameter English Sapwood cuts z o wo lt a S o Sapwood cuts in long fibered softwood help prevent sapwood splintering when the tree falls Make cuts at both sides of the trunk at same height as bottom of felling notch to a depth of about 1 10 of trunk diameter On large diameter trees cut to no more than width of guide bar Do not make sapwood cuts if wood is diseased English Felling Small diameter trees Simple fan cut 001BA145 KN z z lt E Y z z a a 8 8 The hinge E helps control the falling Shout a warning before starting the trae e Apply the spiked bumper behind the felling cut Do not cut through the hinge you hinge pivot the saw around this e Make the felling cut D slightly could lose control of the direction
16. 91 For felling leaners For relieving cuts during bucking For DIY projects English 2 x D R zx ao a Use a low kickback chain and exercise particular caution Begin cut by applying the lower portion of the guide bar nose do not use upper portion because of risk of kickback Cut until depth of kerf is twice the width of the guide bar Swing saw slowly into plunge cutting position take care because of the risk of kickback or pushback Make the plunge cut very carefully Danger of pushback Heartwood cut zZ x o lt a 3 Ss If tree diameter is more than twice the length of the guide bar If a large portion of heartwood remains uncut on large diameter trees 11 English Ontrees that are difficult to fell oak beech to prevent heartwood splintering and maintain planned direction of fall On soft deciduous trees to relieve tension in lying log and prevent slivers in the center of the hinge being torn out of the log e Make the plunge cut in the center of the felling notch there is a danger of pushback at this point then swing the bar in the direction of the arrow Limbing Do not attempt limbing unless you have been trained in the necessary techniques To reduce the risk of accidents and injury do not attempt felling or limbing if you are not an experienced chain saw user Use a low kickback chain Work with the saw supported wherever p
17. STIHL STI H L MS 31 1 391 Instruction Manual Rs A y AA AR 868 1 3 Made in Germany 57 HL ze a cos gt E cS 2000 s Original Instruction Manual Printing inks contain vegetable oils paper can be recycled Printed on chlorine free paper ANDREAS STIHL AG amp Co KG 2010 0458 542 0121 B M1 7 G10 FST 0000001812_006_GB Contents Guide to Using this Manual Safety Precautions and Working Techniques Cutting Attachment Mounting the Bar and Chain Tensioning the Chain Checking Chain Tension Fuel Fueling Chain Lubricant Filling Chain Oil Tank Checking Chain Lubrication Chain Brake Winter Operation Starting Stopping the Engine Operating Instructions Oil Quantity Control Taking Care of the Guide Bar Air Filter System Cleaning the Air Filter Adjusting the Carburetor Spark Arresting Screen in Muffler Spark Plug Replacing the Starter Rope and Rewind Spring Storing the Machine Checking and Replacing the Chain Sprocket Maintaining and Sharpening the Saw Chain Maintenance and Care Minimize Wear and Avoid Damage STIHL MS 311 MS 391 14 14 15 15 16 17 18 19 19 20 21 22 25 26 26 27 27 28 29 30 31 33 33 34 38 40 Special Accessories Ordering Spare Parts Maintenance and Repairs EC Declaration of Conformity Quality Certification 41 42 43 44 44 45 English Dear Customer Thank you for choosing a quality engineered STIHL product Thi
18. alers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information When repairing the machine only use replacement parts which have been approved by STIHL for this power tool or are technically identical Only use high quality replacement parts in order to avoid the risk of accidents and damage to the machine STIHL recommends the use of original STIHL replacement parts Original STIHL parts can be identified by the STIHL part number the ST HL logo and the STIHL parts symbol amp the symbol may appear alone on small parts EC Declaration of Conformity ANDREAS STIHL AG amp Co KG Badstr 115 D 71336 Waiblingen hereby confirms that Model Chain saw Make STIHL Type MS 311 MS 391 Serial identification number 1140 Displacement MS 311 59 0 cm MS 391 64 1 cm conforms to the specifications of Directives 2006 42 EC 2004 108 EC and 2000 14 EC and has been developed and built in compliance with the following standards EN ISO 11681 1 EN 55012 EN 61000 6 1 The measured and guaranteed equivalent sound power level has been determined in accordance with Directive 2000 14 EC Annex V and standard ISO 9207 Measured sound power level MS 311 117 dB A MS 391 117 dB A Guaranteed sound power level MS 311 119 dB A MS 391 119 dB A The EC type approval test was carried out atthe MS 311 MS 391 DPLF Deutsche Pr f und Z
19. annot be moved or removed then it is closed properly If the cap can be moved or removed The base of the cap is tilted in relation to the upper part 18 001BA227 KN Left Base of cap tilted Right Base of cap correctly positioned x o N lt ao f 5 e Fitcap and twist it counterclockwise until it engages in the seat of the filling port e Continue to twist the cap counterclockwise approx 1 4 turn this will twist the base of the cap into the correct position Twist the cap clockwise and close it see the section Closing and Checking the lock Chain Lubricant For automatic and reliable lubrication of the chain and guide bar use only an environmentally compatible quality chain and bar lubricant Rapidly biodegradable STIHL Bioplus is recommended FS Biological chain oil must be resistant to aging e g STIHL Bioplus since it will otherwise quickly turn to resin This results in hard deposits that are difficult to remove especially in the area of the chain drive clutch and chain It may even cause the oil pump to seize The service life of the chain and guide bar depends on the quality of the lubricant Itis therefore essential to use only a specially formulated chain lubricant Do not use waste oil Renewed contact with waste oil can cause skin cancer Moreover waste oil is environmentally harmful FS Waste oil does not have the necessary lubricat
20. ards the operator Kickback occurs e Q Gad 2 o D gt lt a S o when the upper quadrant of the bar nose unintentionally contacts wood or another solid object e g when another limb is touched accidentally during limbing when the chain at the nose of the guide bar is pinched in the cut Quickstop chain brake This device reduces the risk of injury in certain situations it cannot prevent kickback If activated the brake stops the saw chain within a fraction of a second for a description of this device refer to chapter on Chain Brake in this manual To reduce the risk of kickback Work cautiously and avoid situations which could cause kickback Hold the saw firmly with both hands and maintain a secure grip Always cut at full throttle Beaware of the location of the guide bar nose at all times Do not cut with the bar nose Take special care with small tough limbs they may catch the chain Never cut several limbs at once Do not overreach Never cut above shoulder height Use extreme caution when re entering a previous cut Do not attempt plunge cuts if you are not experience in this cutting technique Be alert for shifting of the log or other forces that may cause the cut to close and pinch the chain Always cut with a correctly sharpened properly tensioned chain the depth gauge setting must not be too
21. ckout 2 and throttle trigger 3 set master control lever 4 23 English Position choke shutter closed if engine is cold even if the engine has stalled during opening of throttle after starting Position starting acceleration if engine is warm once the engine has been running for approx one minute e Hold and start the chain saw When the engine has turned over for the first time z a A S lt co 2 t Move the Master Control lever 1 to the position starting acceleration e Press the button on the decompression valve Hold and start the chain saw 24 Once the engine is running 0001BA023 KN e Press the throttle trigger lockout and blip the throttle trigger 2 the Master Control lever 1 jumps to the operating position I and the engine begins to idle z x x ao 3 e Pull the hand guard toward the handlebar The chain brake is released the chain saw is ready for use Fo Open the throttle only when the chain brake is off Increased engine speeds with the chain brake on saw chain is stationary will quickly damage the clutch and chain brake At very low outside temperatures e let the engine warm up briefly with the throttle slightly open e if necessary configure for winter operation see Winter Operation Switch off engine e Move the Master Control lever to the stop position 0 If the Master Control
22. e tensioner slide 2 butts against the left end of the housing slot Disengaging the chain brake e Pull the hand guarad towards the front handle until there is an audible click the chain brake is disengaged Fitting the chain Zz x m o o lt ch a x Wear work gloves to protect your hands from the sharp cutters e Fit the chain start at the bar nose MS 311 MS 391 Fit the guide bar over the studs 1 the cutting edges on the top of the bar must point to the right Engage the peg of the tensioner slide in the locating hole 2 place the chain over sprocket 3 at the same time Turn the tensioning screw 4 clockwise until there is very little chain sag on the underside of the bar and the drive link tangs are engaged in the bar groove Refit the sprocket cover and screw on the nuts only fingertight Go to chapter on Tensioning the Saw Chain MS 311 MS 391 Tensioning the Chain Zz x x N o lt a C5 a Retensioning during cutting work Shut off the engine Loosen the nuts Hold the bar nose up Use a screwdriver to turn the tensioning screw 1 clockwise until the chain fits snugly against the underside of the bar While still holding the bar nose up tighten down the nuts firmly Go to Checking Chain Tension A new chain has to be retensioned more often than one that has been in use for some time Check chain tension frequently s
23. ee chapter on Operating Instructions English Checking Chain Tension 143BA007 KN e Shut off the engine Wear work gloves to protect your hands e The chain must fit snugly against the underside of the bar and it must still be possible to pull the chain along the bar by hand e f necessary retension the chain A new chain has to be retensioned more often than one that has been in use for some time e Check chain tension frequently see chapter on Operating Instructions 15 English Fuel Your engine requires a mixture of gasoline and engine oil For health reasons avoid direct skin contact with gasoline and avoid inhaling gasoline vapor STIHL MotoMix STIHL recommends the use of STIHL MotoMix This ready to use fuel mix contains no benzol or lead has a high octane rating and ensures that you always use the right mix ratio STIHL MotoMix is specially formulated for use in STIHL engines and guarantees a long engine life MotoMix is not available in all markets Mixing Fuel Fo Unsuitable fuels or lubricants or mix ratios other than those specified may result in serious damage to the engine Poor quality gasoline or engine oil may damage the engine sealing rings hoses and the fuel tank Gasoline Use only high quality brand name gasoline with a minimum octane rating of 90 leaded or unleaded If your machine is equipped with a catalytic converter you must use unleaded
24. en the chain brake is off Running the engine at high revs with the chain brake engaged chain locked will quickly damage the shortblock and chain drive clutch chain brake Check chain tension frequently A new saw chain must be retensioned more frequently than one that has been in use already for an extended period English Chain cold Tension is correct when the chain fits snugly against the underside of the bar but can still be pulled along the bar by hand Retension if necessary see Tensioning the Saw Chain Chain at operating temperature The chain stretches and begins to sag The drive links must not come out of the bar groove on the underside of the bar the chain may otherwise jump off the bar Retension the chain see Tensioning the Saw Chain Fo The chain contracts as it cools down If it is not slackened off it can damage the crankshaft and bearings After a long period of full throttle operation After a long period of full throttle operation allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air This protects engine mounted components ignition carburetor from thermal overload After finishing work e Slacken off the chain if you have retensioned it at operating temperature during work FS Always slacken off the chain again after finishing work The chain contracts as it cools down If it is not slackened of
25. eral factors The period of usage is prolonged by Hand protection wearing warm gloves Work breaks The period of usage is shortened by Any personal tendency to suffer from poor circulation symptoms frequently cold fingers tingling sensations Low outside temperatures The force with which the handles are held a tight grip restricts circulation Continual and regular users should monitor closely the condition of their hands and fingers If any of the above symptoms appear e g tingling sensation in fingers seek medical advice Maintenance and Repairs Service the machine regularly Do not attempt any maintenance or repair work not described in the instruction manual Have all other work performed by a servicing dealer MS 311 MS 391 STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information Only use high quality replacement parts in order to avoid the risk of accidents and damage to the machine If you have any questions in this respect consult a servicing dealer STIHL recommends the use of genuine STIHL replacement parts They are specifically designed to match your model and meet your performance requirements To reduce the risk of injury always shut off the engine before carry
26. eration 39 English Minimize Wear and Avoid Damage Observing the instructions in this manual helps reduce the risk of unnecessary wear and damage to the power tool The power tool must be operated maintained and stored with the due care and attention described in this owner s manual The user is responsible for all damage caused by non observance of the safety precautions operating and maintenance instructions in this manual This includes in particular Alterations or modifications to the product not approved by STIHL Using tools or accessories which are neither approved or suitable for the product or are of a poor quality Using the product for purposes for which it was not designed Using the product for sports or competitive events Consequential damage caused by continuing to use the product with defective components Maintenance Work All the operations described in the Maintenance Chart must be performed on a regular basis If these maintenance operations cannot be performed by the owner they should be performed by a servicing dealer STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL 40 servicing dealer STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information If these maintenance operations are not carried out as specified the user assu
27. ered in this manual Safety Precautions and Working Techniques Because a chain saw is a high speed wood cutting tool with very sharp cut ters some special safety precautions must be observed in addition to those that generally apply when working with an axe or hand saw It is important you read and understand the instruction manual before using your power tool for the first time and keep the manual in a safe place for future refer ence Non observance of the safety precautions may result in serious or even fatal injury Observe all applicable local safety regulations standards and ordinances If you have not used this type of power tool before Have your dealer or other experienced user show you how to operate your power tool or attend a special course in its operation Minors should never be allowed to use a power tool Keep bystanders especially children and animals away from the work area When the power tool is not in use shut it off so that it does not endanger others Secure it against unauthorized use The user is responsible for avoiding injury to third parties or damage to their property MS 311 MS 391 Do not lend or rent your power tool without the instruction manual Be sure that anyone using it understands the information contained in this manual The use of noise emitting power tools may be restricted to certain times by national or local regulations To operate the power tool y
28. erformance requirements Never attempt to modify your power tool in any way since this may increase the risk of personal injury STIHL excludes all liability for personal injury and damage to property caused while using unauthorized attachments Do not use a pressure washer to clean the unit The solid jet of water may damage parts of the unit Clothing and Equipment Wear proper protective clothing and equipment Clothing must be sturdy but allow complete free dom of movement Wear snug fitting clothing with cut retardant inserts an overall and jacket combination do not wear a work coat Avoid clothing that could get caught on branches or brush or moving parts of the machine Do not wear a scarf necktie or jewelry Tie up and confine long hair e g with a hair net cap hard hat etc English Wear steel toed safety boots with cut retardant inserts and non slip soles K Wear a safety hard hat where there is a danger of head injuries from fall ing objects arp U Wear safety glasses or a face shield and hearing protection e g earplugs or ear muffs Wear heavy duty gloves STIHL offers a comprehensive range of personal protective clothing and equipment Transporting the Chain Saw Always engage the chain brake and fit the chain guard scabbard before carrying the saw short distances Also stop the engine before carrying the saw longer distances more than about 50 m Alwa
29. ertifizierungsstelle f r Land und Forsttechnik NB 0363 Max Eyth Weg 1 D 64823 Gro Umstadt Certification No MS 311 K EG 2009 5202 MS 391 K EG 2009 5143 The technical documentation has been retained by ANDREAS STIHL AG amp Co KG Produktzulassung The year of construction and the serial number are shown on the machine Waiblingen 17 06 2010 ANDREAS STIHL AG amp Co KG PP wtf Head of Product Group Management Elsner MS 311 MS 391 Quality Certification DIN ISO 9001 ns 39 wo N o lt a o o o All STIHL products comply with the highest quality standards An independent organization has certified that all products manufactured by STIHL meet the strict requirements of the ISO 9001 standard for quality management systems in terms of product development materials purchasing production assembly documentation and customer service English 45 0458 542 0121 B englisch 0458 542 0121 B
30. f it can damage the crankshaft and bearings 25 English Short term storage Wait for engine to cool down Keep the machine with a full tank of fuel in a dry place well away from sources of ignition until you need it again Long term storage See Storing the machine 26 Oil Quantity Control Adjustable flow oil pump is a special option Different quantities of oil are required for different bar lengths types of wood and cutting techniques 2 x wo lt ao 3 o Use the adjusting screw 1 on underside of machine to vary the oil feed rate as required Ematic position E medium oil flow rate e turn the adjusting screw to E Ematic position To increase oil feed e turn the adjusting screw clockwise Turn reduce oil feed e turn the adjusting screw counterclockwise FS The chain must always be wetted with a film of lubricant Taking Care of the Guide Bar 143BA026 KN e Turn the bar over every time you sharpen the chain and every time you replace the chain this helps avoid one sided wear especially at the nose and underside of the bar Regularly clean the oil inlet hole 1 the oilway 2 and the bar groove 3 e Measure the groove depth with the scale on the filing gauge special accessory in the area used most for cutting Chain type Pitch Minimum groove depth Picco 3 8 P 5 0 mm Rapid 1 4 4 0 mm Rapid 3 8 0 325 6 0 mm Rap
31. gine is running If the chain becomes jammed by an obstruction switch off the engine immediately before attempting to remove the obstruction To reduce the risk of injury shut off the engine before changing the saw chain To reduce the risk of fire do not smoke while operating or standing near your power tool Note that combustible fuel vapor may escape from the fuel system If your power tool is subjected to unusually high loads for which it was not designed e g heavy impact or a fall always check that it is in good condition before continuing work see also Before Starting Check the fuel system in particular for leaks and make sure the safety devices are working properly Do not continue operating your power tool if itis damaged In case of doubt have the machine checked by your servicing dealer Make sure the idle speed setting is correct The chain must not run when the engine is idling with the throttle trigger released Check and correct the idle speed setting at regular intervals If the saw chain still moves have your dealer check your machine and make proper adjustments or repairs Reactive Forces The most common reactive forces that occur during cutting are kickback pushback and pull in English Dangers of kickback Kickback can result in serious or fatal injury EA amp o a 2 lt a 3 Ss Kickback occurs when the saw is suddenly thrown up and back in an uncontrolled arc tow
32. id 0 404 7 0 mm MS 311 MS 391 If groove depth is less than specified e Replace the guide bar The drive link tangs will otherwise scrape along the bottom of the groove the cutters and tie straps will not ride on the bar rails MS 311 MS 391 Air Filter System The air filter system can be adapted to different operating conditions by the insertion of different air filters Retrofitting is simple Depending on equipment version the machine is equipped with a fleece filter a fleece filter with a felt prefilter or a fabric filter Fleece filter For normal or dry applications Fleece filter with felt prefilter For very dusty operating environments Fabric filter For extreme winter conditions e g powdered or drifting snow or frost formation English Cleaning the Air Filter If there is a noticeable loss of engine power Remove shroud Move the Master Control Lever to the stop position 0 e Push the front hand guard forwards the saw chain is blocked x oa S lt co co a Loosen screws 1 Remove the shroud 2 Remove air filter e Clean away loose dirt from around the filter FS Do not use tools to remove and install the air filter the air filter could be damaged in the process 27 English 4903BA006 KN e Push the clip 1 up and to the rear and tilt the air filter toward the rear handle and remove it e Always replace a damaged filte
33. ing out any maintenance or repairs or cleaning the machine Exception Carburetor and idle speed adjustments Do not turn the engine over on the starter with the spark plug boot or spark plug removed unless the slide control stop switch is on STOP or 0 since there is otherwise a risk of fire from uncontained sparking To reduce the risk of fire do not service or store your machine near open flames Check the fuel filler cap for leaks at regular intervals Use only a spark plug of the type approved by STIHL and make sure it is in good condition see Specifications Inspect the ignition lead insulation in good condition secure connection Check the condition of the muffler English To reduce the risk of fire and damage to hearing do not operate your machine if the muffler is damaged or missing Do not touch a hot muffler since burn injury will result Vibration behavior is influenced by the condition of the AV elements check the AV elements at regular intervals Check the chain catcher and replace it if damaged Stopping the Engine before checking chain tension before retensioning the chain before replacing the chain before rectifying problems Observe sharpening instructions keep the chain and guide bar in good condition at all times for safe and correct handling of the saw The chain must be properly sharpened tensioned and well lubricated Always change
34. ing properties and is unsuitable for chain lubrication MS 311 MS 391 If the oil level in the tank does not go down the reason may be a fault in the oil supply system Check chain lubrication clean the oilways contact your dealer for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively Preparations Filling Chain Oil Tank by an authorized STIHL servicing dealer z S 10 lt a S S Thoroughly clean the oil filler cap and the area around itto ensure that no dirt falls into the tank e Position the machine so that the filler cap is facing up Open the filler cap Fill up with chain oil e Refill the chain oil tank every time you refuel Take care not to spill chain oil while refilling and do not overfill the tank STIHL recommends you use the STIHL filler nozzle for chain oil special accessory e Close the filler cap There must still be a small amount of oil in the oil tank when the fuel tank is empty MS 311 MS 391 English Checking Chain Lubrication Zz x x A S lt 0 oo The saw chain must always throw off a small amount of oil Fo Never operate your saw without chain lubrication If the chain runs dry the whole cutting attachment will be irretrievably damaged within a very short time Always check chain lubrication and the oil level in the tank before starting work Every new chain has to be
35. ion STIL ca ESTA 4 001BA207 KN e Push the scabbard extension locking tabs 1 first onto the scabbard until the required length is obtained Other special accessories File holder with round file Filing gauge Reference gauges English STIHL lubricating grease STIHL filler nozzle for fuel helps avoid spills and overfilling during refueling STIHL filler nozzle for chain oil helps avoid spills and overfilling Contact your STIHL dealer for more information on these and other special accessories 43 English Ordering Spare Parts Please enter your saw model serial number as well as the part numbers of the guide bar and saw chain in the spaces provided This will make re ordering simpler The guide bar and saw chain are subject to normal wear and tear When purchasing these parts always quote the saw model the part numbers and names of the parts Model Serial number Guide bar part number Chain part number 44 Maintenance and Repairs Users of this machine may only carry out the maintenance and service work described in this user manual All other repairs must be carried out by a servicing dealer STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer STIHL de
36. iver Remove the remainder of the rope from the rotor and starter handle z g 2 lt a o u Thread the new starter rope through the starter handle and secure it by making a special knot Pull the knot into the starter handle English e Thread the rope from above through the rope guide bush 5 and rope rotor 6 and secure with a simple knot Coat the bearing bore in the rope rotor with non resinous oil Slip the rope rotor onto the starter post 7 turn it back and forth a little until the anchor loop of the rewind spring engages 31 English 001BA096 KN e Refit the pawls 4 in the rotor and slip the washer 3 over the starter post e Press the spring clip 2 on to the starter post and over the pegs of the pawl with a screwdriver or suitable pliers the spring clip must point in the clockwise direction as in the picture Tension the rewind spring 213BA021 KN e Make a loop in the unwound starter rope and use itto turn the rope rotor six full revolutions in the direction of the arrow e Hold the rope rotor tight pull out the twisted rope and untangle it Release the rope rotor Slowly let go of rope so that it winds onto the rotor 32 The starter grip must be drawn firmly into the rope guide bush If it tips sideways increase the spring tension by another turn It must be possible to turn the rope rotor on another half turn
37. lements Have replaced by dealer X 38 MS 311 MS 391 English The following intervals apply to normal operating conditions only If your daily work gt ing time is longer or operating conditions are difficult very dusty work area resin T ES rich wood tropical wood etc shorten the specified intervals accordingly If you only Q use the saw occasionally extend the intervals accordingly x ES pd fe 5 k 3 8 p 5 5 o T E E 3 ke D Q o gt N D O D o 3 gt 5 E 3 is a o o El 1 5 2 fe L 2 5 E o Cooling inlets Clean X Air inlet on fan housing Clean X X Cylinder fins Clean X Preseparator port and carburetor body Clean x Carb preheat shutter and preheating port Clean winter operation only x Check idle adjustment chain must not rotate A x Carburetor Readjust idle x Readjust electrode gap x Spark plug Replace after every 100 operating hours All accessible screws and nuts not adjust Retighten X ing screws Check x Spark arresting screent in muffler Clean or replace X Check x Chain catcher Replace x Safety labels Replace Doa see chapter on Chain Brake 3 gt not in all versions market specific MS 311 MS 391 STIHL recommends a STIHL servicing dealer Firmly tighten down the cylinder base screws of chain saws 3 4 kW or more after 10 to 20 hours of op
38. mes responsibility for any damage that may occur Among other parts this includes Damage to the engine due to neglect or deficient maintenance e g air and fuel filters incorrect carburetor adjustment or inadequate cleaning of cooling air inlets intake ports cylinder fins Corrosion and other consequential damage resulting from improper storage Damage to the machine resulting from the use of poor quality replacement parts Parts Subject to Wear and Tear Some parts of the power tool are subject to normal wear and tear even during regular operation in accordance with instructions and depending on the type and duration of use have to be replaced in good time Among other parts this includes Saw chain guide bar Drive components clutch clutch drum chain sprocket Filters air oil fuel Starter mechanism Spark plug Components of antivibration system MS 311 MS 391 English Main Parts Shroud catch Carburetor adjusting screws Spark plug boot Slide summer operation and winter operation Decompression valve Chain brake Chain sprocket Chain sprocket cover Chain catcher Side access chain tensioner Bumper spike Guide bar Oilomatic saw chain Oil filler cap Muffler Front hand guard Front handle handlebar Starter grip Fuel tank twist lock Master Control lever Throttle trigger Throttle trigger interlock Rear handle Rear hand guard Serial numbe
39. ngths the cutter heights also vary and cause rough running of the saw chain and chain breakage e All cutters must be filed down equal to the length of the shortest cutter ideally one should have this done in the workshop using an electric sharpener Depth gauge setting x o A o L ao a E The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness a Required distance between depth gauge and cutting edge When cutting softwood outside of the frost season the distance can be increased by up to 0 2 mm 0 008 Chain pitch Depth gauge Distance a Inches mm mm Inches 1 4 6 35 0 65 0 026 3 8 P 9 32 0 65 0 026 0 325 8 25 0 65 0 026 3 8 9 32 0 65 0 026 0 404 10 26 0 80 0 031 36 Lowering the depth gauges The depth gauge setting is lowered when the cutter is sharpened Check the depth gauge setting after each sharpening 689BA047 KN e Lay the appropriate file gauge for the chain pitch 1 on the saw chain and press it against the cutter to be checked if the depth gauge protrudes past the file gauge the depth gauge must be reworked z x Q e lt ao Q e Rework the depth gauge so that it is flush with the file gauge 689BA044 KN e Afterwards dress the leading edge of the depth gauge parallel to the service mark see arrow when doing this be careful n
40. of point only as far as the hinge The higher than bottom of the felling notch Cut horizontally Leave approx 1 10 of the tree diameter uncut between the felling cut and the felling notch This is the hinge Drive wedges into the felling cut in good time Use only wooden aluminum or plastic wedges Never steel which can damage the chain and cause kickback 10 fall this could result in an accident Leave a broader hinge on rotten trees Shout a second warning immediately before the tree falls spiked bumper rolls against the trunk MS 311 MS 391 Large diameter trees Sectioning method 001BA148 KN If the diameter of the tree is greater than the length of the guide bar use the sectioning method 1 First cut Nose of guide bar should enter wood just behind the hinge hold the saw horizontally and swing it as far as possible using the bumper spike as a pivot avoid repositioning the saw more than necessary zZ x x lt ao Q o When repositioning the saw for the next cut keep the guide bar fully engaged in the kerf to keep the felling cut straight apply the spiked bumper again and so on Insert a wedge 3 in the cut Last cut Apply the spiked bumper as for the simple fan cut do not cut through the hinge Special cutting techniques Plunge cuts and heartwood cuts require special training and experience Plunge cutting MS 311 MS 3
41. ossible Do not stand on the log while limbing it Do not cut with the bar nose Watch for limbs which are under tension Never cut several limbs at once 12 When cutting small logs Use a sturdy and stable support sawhorse Never hold the log with your leg or foot Never allow another person to hold the log or help in any other way Lying or standing logs under tension Always make cuts in the correct sequence first at the compression side 1 then at the tension side 2 the saw may otherwise pinch or kick back risk of injury 001BA151 KN z S N LO lt ra 3 o e Make relieving cut at the compression side 1 e Make bucking cut at the tension side 2 Be wary of pushback when making bucking cut from the bottom upwards underbuck Fo Do nat cut a lying log at a point where it is touching the ground because the saw chain will otherwise be damaged Ripping cut zZ x D x ao a Cutting technique in which the bumper spike is not used risk of pull in start the cut with the guide bar at the shallowest possible angle take extra care since there is an increased danger of kickback MS 311 MS 391 Vibrations Prolonged use of the power tool may result in vibration induced circulation problems in the hands whitefinger disease No general recommendation can be given for the length of usage because it depends on sev
42. ot to further lower the highest point of the depth gauge Depth gauges that are too low increase the kickback tendency of the chain saw zZ x a Pe e lt oO a e Lay the file gauge on the saw chain the highest point of the depth gauge must be flush with the file gauge RSC3 RMC3 PMC3 PMMC3 The upper part of the humped drive link with service mark is lowered at the same time as the depth gauge of the cutter The rest of the humped drive link must not be filed otherwise this could increase the tendency of the chain saw to kick back MS 311 MS 391 e After sharpening clean the saw chain thoroughly removing any filings or grinding dust lubricate the saw chain thoroughly e Inthe event of extended periods of disuse store saw chains in cleaned and oiled condition English Sharpening tools special accessories Round file Y mm Inches Round file Part number File holder Part number File gauge Part number Taper square file Part number Sharpening set Part number Chain pitch Inches mm 1 4 6 35 3 8 P 9 32 0 325 8 25 3 8 9 32 0 404 10 26 4 0 4 0 4 8 5 2 5 5 5 32 5 32 3 16 13 64 7 32 5605 772 4006 5605 772 4006 5605 772 4806 5605 772 5206 5605 772 5506 5605 750 4327 5605 750 4327 5605 750 4328 5605 750 4329 5605 750 4330 1110 893 4000 1110 893 4000 1110 893 4000 1110 893 4000 1106 893 4000
43. ou must be rested in good physical condition and mental health If you have any condition that might be aggravated by strenuous work check with your doctor before operating a power tool Persons with pacemakers only The ignition system of your power tool produces an electromagnetic field of a very low intensity This field may interfere with some pacemakers To reduce health risks STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer before operating this tool Do not operate the power tool if you are under the influence of any substance drugs alcohol which might impair vision dexterity or judgment To reduce the risk of accidents or injury put off the work in poor weather conditions rain snow ice wind Use your saw for cutting wood or wooden objects only Do not use your power tool for any other purpose since this may result in accidents Only use tools guide bars chains chain sprockets and accessories that are explicitly approved for this power tool model by STIHL or are technically identical If you have any questions in this respect consult a servicing dealer MS 311 MS 391 Use only high quality parts and accessories in order to avoid the risk of accidents and damage to the machine STIHL recommends the use of STIHL original tools guide bars chains chain sprockets and accessories They are specifically designed to match your model and meet your p
44. oughly shake the mixture in the canister before fueling your machine Pressure may build up in the canister open it carefully e Clean the fuel tank and canister from time to time Dispose of remaining fuel and cleaning fluid properly in accordance with local regulations and environmental requirements MS 311 MS 391 English Closing Fueling mi Fuel filler cap 001BA219 KN e Turn the cap counterclockwise approx 1 4 turn 001BA220 KN Clip is in an upright position Fit the cap position marks on the cap and the filling port must line up Push the cap down as far as it will go 3 E e Before fueling clean the cap and E the area around it to ensure that no dirt falls into the fuel tank e Remove fuel filler cap e Always position the machine so that Refueling the cap is facing upwards 001BA221 KN Opening Take care not to spill fuel while fueling A and do not overfill the tank e Hold the cap down and twist it STIHL recommends use of the STIHL clockwise until it engages filling system for fuel special accessory e Refueling 001BA218 KN 2 x A A N lt a z Swing the clip into an upright position e Fold down the clip as far as it will go MS 311 MS 391 17 English Checking the lock 4 The lug on the clip must engage entirely in the recess arrow zZ x o A N lt ao 3 iS e Grip the cap if the cap c
45. r A El O 4903BA003 KN MS 311 MS 391 41 English Specifications Engine STIHL single cylinder two stroke engine MS 311 Displacement 59 0 cm Bore 47 mm Stroke 34 mm Engine power to 3 1 kW 4 2 HP ISO 7293 at 9500 rpm Idle speed 2800 rpm Maximum permissible speed with bar and chain 13000 rpm MS 391 Displacement 64 1 cm Bore 49 mm Stroke 34 mm Engine power to 3 3 kW 4 5 HP ISO 7293 at 9500 rpm Idle speed 2800 rpm Maximum permissible speed with bar and chain 13000 rpm Ignition system Electronic magneto ignition Spark plug Bosch WSR 6 F suppressed NGK BPMR 7A Electrode gap 0 5 mm 42 Fuel system All position diaphragm carburetor with integral fuel pump Fuel tank capacity 0 60 Chain lubrication Fully automatic speed controlled oil pump with reciprocating piston additional manual oil flow control Oil tank capacity 0 350 Weight dry without bar and chain MS 311 6 4 kg MS 391 6 4 kg Cutting attachment Rollomatic E guide bars Bar lengths 37 40 45 cm Pitch 3 8 9 32 mm Groove width 1 6 mm Sprocket nose 10 tooth Saw chains 3 8 Rapid Micro Comfort 36 RMC Rapid Super Comfort 36 RSC Rapid Super Comfort 3 36 RSC3 Pitch 3 8 9 32 mm Drive link gauge 1 6 mm Chain sprockets 7 tooth for 3 8 rim sprocket Sound and vibration levels The idle full throttle and nominal maximum speed are gi
46. r For versions with fleece filter with felt prefilter z x a 2 lt ao 3 5 e Separate felt filter 1 from fleece filter 2 clean see Cleaning the air filter Cleaning the air filter e Knock out the filter or blow it clear with compressed air from the inside outwards In case of stubborn dirt e Wash the filter in STIHL special purpose cleaner special accessories or a clean non flammable cleaning liquid e g warm soapy water and dry it 28 FS Do nat clean fleece filters with a brush The felt prefilter protects the fleece filter and increases its service life Thus it should be replaced at shorter intervals than the fleece filter Installing the air filter mO PEN R 1 2131 mer Nz Q pS aa oy s e Insert the lugs 1 into the recesses 2 e Tilt the air filter toward the filter housing and close the clip e Refit the shroud and tighten the screws Adjusting the Carburetor General Information The carburetor comes from the factory with a standard setting This setting provides an optimum fuel air mixture under most operating conditions With this carburetor it is only possible to correct the adjusting screws within fine limits FS If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating Standard setting wy
47. rom dirt and move freely Chain brake maintenance The chain brake is subject to normal wear It is necessary to have it serviced and maintained regularly by trained personnel STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer Maintain the following servicing intervals Full time usage every 3 months Part time usage every 6 months Occasional usage every 12 months MS 311 MS 391 Winter Operation Remove shroud Move the Master Control lever to the stop position 0 e Push the hand guard forwards the saw chain is blocked 4903BA002 KN e Loosen screws 1 Remove the shroud 2 Pre heat carburetor At temperatures below 10 C 0001BA002 KN e Pull the slide 1 out of the position summer operation MS 311 MS 391 0001BA003 KN e Place the slide in the position winter operation facing upwards e Refit the shroud and tighten the screws Heated air is now drawn in from around the cylinder and circulates around the carburetor this helps prevent carburetor icing At temperatures above 20 C e Ensure that the slide is set back to position summer operation without fail otherwise the engine may malfunction due to overheating At temperatures below 10 C Under extreme winter conditions temperatures below 10 C powdered or drifting snow i
48. s If necessary inform the police utility company or railway authority Cutting Do not operate your saw with the starting throttle lock engaged Engine speed cannot be controlled with the throttle trigger in this position Work calmly and carefully in daylight conditions and only when visibility is good Ensure you do not endanger others stay alert at all times Use the shortest possible guide bar The chain guide bar and chain sprocket must match each other and your saw zZ S a co a lt ra 3 o Position the saw so that your body is clear of the cutting attachment Always pull the saw out of the cut with the chain running Use your chain saw for cutting only It is not designed for prying or shoveling away limbs roots or other objects Do not underbuck freely hanging limbs English To reduce the risk of injury take special care when cutting shattered wood because of the risk of injury from slivers being caught and thrown in your direction Make sure your saw does not touch any foreign materials Stones nails etc may be flung off damage the saw chain or cause the saw to kick back unexpectedly z S a ise So lt a 3 o If on a slope stand on the uphill side of the log Watch out for rolling logs When working at heights Always use a lift bucket Never work on a ladder or in a tree Never work on an insecure support Do not work above shoulder height
49. s machine has been built using modern production techniques and comprehensive quality assurance Every effort has been made to ensure your satisfaction and troublefree use of the machine Please contact your dealer or our sales company if you have any queries concerning your machine Your ha Cue Ln Hans Peter Stihl CE English Guide to Using this Manual Pictograms Pictograms that appear on the machine are explained in this Instruction Manual Depending on the machine and equipment version the following pictograms may appear on the machine Fuel tank fuel mixture of me gasoline and engine oil Tank for chain oil chain oil Engage and release m chain brake Coasting brake Direction of chain travel Ematic chain oil flow adjustment Tension saw chain Intake air baffle winter operation N Intake air baffle summer operation dd y A y Actuate manual fuel pump Symbols in text Handle heating Actuate decompression valve Warning where there is a risk of an accident or personal injury or serious damage to property FS Caution where there is a risk of damaging the machine or its individual components Engineering improvements STIHL s philosophy is to continually improve all of its products For this reason we may modify the design engineering and appearance of our products periodically Therefore some changes modifications and improvements may not be cov
50. s not run satisfactorily e Turn high speed screw H clockwise leaner no further than stop FS If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating English Spark Arresting Screen in Muffler In some countries the muffler is equipped with a spark arresting screen e Ifthe engine is down on power check the spark arresting screen in the muffler e Wait for the muffler to cool down 0001BA009 KN Take out the screw 1 Pull out the spark arresting screen 2 e Clean the spark arresting screen If the screen is damaged or heavily carbonized fit a new one Refit the spark arresting screen Insert the screw and tighten it down 29 English Spark Plug e Ifthe engine is down on power difficult to start or runs poorly at idle speed first check the spark plug e Fit anew spark plug after about 100 operating hours or sooner if the electrodes are badly eroded Install only suppressed spark plugs of the type approved by STIHL see Unscrew spark plug Specifications e Pull off the spark plug boot Checking the spark plug Remove the spark plug Move the Master Control lever to the stop position 0 e Push the hand guard forwards the saw chain is blocked A e Clean dirty spark plug Check electrode gap A and readjust if necessary see Specifications E x a S
51. st the ground thumb wrapped around the handlebar e Place your right foot through the rear handle MS 311 MS 391 Between the knees or thighs Zz x 2 ao Q o e clamp the rear handle between the knees or thighs e grip the handlebar firmly with the left hand thumb wrapped around the handlebar MS 311 MS 391 Starting zZ x o ic lt a Q o e with the right hand pull the starter grip slowly until you feel it engage and then give it a brisk strong pull simultaneously press down on the handlebar do not pull the starter rope out all the way risk of breakage Do not let the starter grip snap back guide it slowly back into the housing so that it can rewind properly With a new engine or after a long period of disuse with machines without an additional manual fuel pump it may be necessary to pull the starter rope several times to prime the fuel line Starting the chain saw There must not be anyone within the swivel range of the chain saw English 0001BA020 KN e Press the button the decompression valve will be opened The decompression valve is closed automatically when the engine starts for the first time For this reason press the button again before each additional starting procedure HA N i 0001BA021 KN e Push the hand guard 1 forwards the saw chain is blocked e Simultaneously press the throttle trigger lo
52. t special accessory Slide needle cage onto the crankshaft stub e After refitting turn the clutch drum and or spur chain sprocket approx 1 full turn so that the carrier for the oil pump drive engages e Refit the rim sprocket cavities toward the outside e Refit washer and E clip on the crankshaft 34 Maintaining and Sharpening the Saw Chain Sawing effortlessly with a properly sharpened saw chain A properly sharpened saw chain cuts through wood effortlessly even with very little pushing Never use a dull or damaged saw chain this leads to increased physical strain increased vibration load unsatisfactory cutting results and increased wear e Clean the saw chain e Check the saw chain for cracks and damaged rivets e Replace damaged or worn chain components and adapt these parts to the remaining parts in terms of shape and level of wear rework accordingly Carbide tipped Duro saw chains are especially wear resistant For an optimal sharpening result STIHL recommends STIHL servicing dealers Compliance with the angles and dimensions listed below is absolutely necessary An improperly sharpened saw chain especially depth gauges that are too low can lead to increased kickback tendency of the chain saw risk of injury zZ x N A Q ao o e The chain pitch marking a is embossed in the area of the depth gauge of each cutter Marking a Chain pitch
53. t is recommended to use the cover plate mounting kit special accessory In case of erratic idling behavior or poor acceleration e Turn the low speed screw L 1 4 turn counterclockwise English Whenever the low speed screw L has been adjusted it is usually also necessary to adjust the idle speed adjusting screw LA see Setting the carburetor e if the chain saw is extremely cold frost formation after starting bring the engine up to operating temperature at increased idle speed disengage chain brake Cover plate The cover plate special accessory keeps out powdered or drifting snow When the cover plate is used the slide must be in the winter position If engine trouble occurs first check whether use of the cover plate is necessary Attach cover plate zZ x 3 lt 0 o e o e Insert cover plate 1 with both tabs arrows and fasten with the screws 2 21 English Starting Stopping the Engine Positions of the Master Control lever z S o lt ao gt o Stop 0 engine off ignition is switched off Operating position I engine is running or can start Warm start this position is for starting the warm engine the Master Control lever returns to the operating position when the throttle trigger is squeezed Cold start this position is for starting the cold engine 22 Adjust Master Control lever To adjust the Master Con
54. the chain guide bar and sprocket in good time Check condition of clutch drum periodically Store fuel and chain lubricant in properly labelled safety type canisters only When handling gasoline avoid direct contact with the skin and avoid inhaling fuel vapour health risk To reduce the risk of injury shut off the engine immediately if the chain brake malfunctions contact your servicing dealer do not use your power tool until the problem has been rectified see Chain Brake 13 English Cutting Attachment STIHL is the only manufacturer in the industry to produce its own chain saws guide bars saw chains and chain sprockets A cutting attachment consists of the saw chain guide bar and chain sprocket The cutting attachment that comes standard is designed to exactly match the chain saw z gt lt a 3 o The pitch t of the saw chain 1 chain sprocket and the nose sprocket of the Rollomatic guide bar must match The drive link gauge 2 of the saw chain 1 must match the groove width of the guide bar 3 If non matching components are used the cutting attachment may be damaged beyond repair after a short period of operation 14 Mounting the Bar and Chain Removing the chain sprocket cover 143BA034 KN e Unscrew the nuts and take off the chain sprocket cover z x 12 lt a gt Ss e Turn the screw 1 counterclockwise until th
55. trol lever from the operating position I to cold start press and hold down the throttle trigger lockout and throttle trigger simultaneously set Master Control lever To set the Master Control lever to warm start first set it to cold start then push the Master Control lever into the warm start Jx position Switching to the warm start position is only possible from the cold start position Simultaneously pressing the throttle trigger lockout and blipping the throttle trigger causes the Master Control lever to jump from the warm start x position to the operating position I To switch off the engine set the Master Control lever to Stop 0 Position choke shutter closed if engine is cold ifthe engine stalls during opening of throttle after starting ifthe fuel tank has run empty engine stalled out Position starting acceleration if engine is warm once the engine has been running for approx one minute when the engine has turned over for the first time after ventilation of the combustion chamber if the engine was flooded Holding the chain saw There are two ways to hold the chain saw during starting On the ground 0001BA017 KN e Place the chain saw securely on the ground assume a steady stance the saw chain must not touch any objects and also must not touch the ground e With the left hand on handlebar press the chain saw firmly again
56. ual Check operation of chain brake front hand guard Correctly mounted guide bar Correctly tensioned chain Smooth action of throttle trigger and throttle trigger interlock throttle trigger must return automatically to idle position Master Control lever stop switch must move easily to STOP or 0 Check that the spark plug boot is secure a loose boot may cause arcing that could ignite combustible fumes and cause a fire Never attempt to modify the controls or the safety devices in any way Keep the handles dry and clean free from oil and pitch for safe control of the chain saw To reduce the risk of personal injury do not operate your saw if it is damaged or not properly assembled Starting the engine Start the engine at least 3 meters from the fueling spot outdoors only Place the unit on firm ground in an open area Make sure you have good balance and secure footing Hold the unit securely The cutting attachment must be clear of the ground and all other obstructions because it may begin to run when the engine starts Your chain saw is designed to be operated by one person only Do not allow other persons in the work area even when starting To reduce risk of chain rotation and personal injury lock the chain with the chain brake before starting Do not drop start your machine the correct starting procedure is described in the instruction manual Do
57. ven equal consideration when calculating sound and vibration levels For further details concerning compliance with the employers Directive on vibration 2002 44 EC see www stihl com vib Sound pressure level Lyeg to ISO 22868 MS 311 MS 391 105 dB A 105 dB A Sound power level Lweq to ISO 22868 MS 311 MS 391 115 dB A 115 dB A Vibration level apy eq to ISO 22867 Handle Handle left right MS 311 40m s 4 0 m s MS 391 40m s 4 0 m s The K factor in accordance with Directive 2006 42 EC is 2 5 dB A for the sound pressure level and sound power level the K factor in accordance with Directive 2006 42 EC is 2 0 m s for the vibration measurement MS 311 MS 391 REACH REACH is an EC regulation and stands for the Registration Evaluation Authorisation and Restriction of Chemical substances For information on compliance with the REACH regulation EC No 1907 2006 see www stihl com reach MS 311 MS 391 Special Accessories Chain scabbard If you use guide bars of different lengths on the saw the length of the chain scabbard must be matched to the guide bar to help reduce the risk of injury If the chain scabbard does not cover the full length of the guide bar a suitable chain scabbard or a scabbard extension is necessary Depending on the model the scabbard extension either comes standard with the saw or is available as a special accessory Fitting the chain scabbard extens
58. when the rope has been drawn out completely If not the spring has been tensioned too tightly and may break Remove one turn of the rope from the rotor e Install the fan housing e Refit the shroud and tighten the screws Replacing broken rewind spring Remove the rope rotor as described for Replace torn starter rope The broken pieces of spring may still be under tension and can spring apart unexpectedly on removal from the fan housing risk of injury Wear face shield and protective gloves e Carefully pry out the broken pieces of spring with a screwdriver e Apply a few drops of non resinous oil to the new replacement spring 213BA022 KN Position the replacement spring with frame in the fan housing the anchor loop arrow must be located over the retaining lug in the fan housing Apply suitable tools screwdriver punch etc to the recesses and push the spring into its seat in the fan housing the spring slides out of the frame Refit the rope rotor tension the rewind spring Install the fan housing Refit the shroud and tighten the screws MS 311 MS 391 Storing the Machine Checking and Replacing the Chain Sprocket English For periods of 3 months or longer Remove chain sprocket cover saw e Drain and clean the fuel tank in a chall and guide bar well ventilated area e Release chain brake pull hand e Dispose of fuel properly in guard against the front handle
59. ys carry the saw by the front handle handlebar with the hot muffler away from your body the guide bar must point to the rear To avoid serious burn injuries avoid touching hot parts of the machine especially the surface of the muffler Transporting in a vehicle Properly secure your power tool to prevent turnover fuel spillage and damage English Fueling Gasoline is an extremely flammable fuel Keep clear of naked flames Do not spill any fuel do not smoke Always shut off the engine before refueling Do not fuel a hot engine fuel may spill and cause a fire Open the fuel cap carefully to allow any pressure build up in the tank to release slowly and avoid fuel spillage Fuel your power tool only in well ventilated areas If you spill fuel wipe the machine immediately if fuel gets on your clothing change immediately Your power tool comes standard with either a screw type or bayonet type fuel cap After fueling tighten Es down the screw type fuel cap as securely as possible S This reduces the risk of unit vibrations causing the fuel cap to loosen or come off and spill quantities of fuel Insert the fuel cap with hinged grip bayonet type cap correctly in the opening turn it clockwise as far as stop and fold the grip down Before starting Check that your power tool is properly assembled and in good condition refer to appropriate chapters in the instruction man
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