Instruction Manual FS40
Contents
1. N IDT Nylon line achieves a soft cut for edging and trimming around fence posts trees etc less risk of damaging tree bark warnine To reduce the risk of injury never use steel wire in place of the nylon cutting line STIHL FixCut Check the wear limit marks e Ifthe raised moldings 1 on the base of the attachment are worn as shown in the illustration above right do not continue using the mowing head Install a new one There is otherwise a risk of injury from thrown parts of the head STIHL PolyCut 6 3 Mowing Head with Polymer Blades For mowing unobstructed edges of meadows without posts fences trees or similar obstacles It is important to follow the maintenance instructions for the Polycut mowing head Check the wear limit marks Wear limit marks are integrated in the base of the PolyCut Do not continue using the PolyCut 6 3 if one of the circular holes 1 arrow becomes visible or if the projecting rim 2 arrow has worn away Install a new mowing head AA anne If the wear limit marks are ignored there is a risk of the cutting tool shattering and flying parts injuring the operator or bystanders To reduce the risk of accidents from shattered blades avoid contact with stones metal and similar solid objects Check PolyCut blades for cracks at regular intervals If a crack is found in one of the blades always replace all the blades FS 40 FS 40 C FS 50 F2. STIHL AutoCut 5 2 lt g 52 is 10 3 e e lt lt a a N g ise e A zZ x x wo o lt ea N a N Screw the mowing head counterclockwise on to the shaft 1 Slip the mowing head 2 over the shaft 5 and engage hex recess 7 as far as stop id ne 1 inthemawing on the external hexagon 6 Block the shaft e Wind the mowing line 3 on to the Fit the cap 8 on the mowing head screw it clockwise on to the shaft Tighten down the mowing head spool 4 firmi as far as stop and tighten it down y e Thread the nylon line through the firmly sleeves and fitthe spool in the head lonas Remove the tool used to block the shaft The individual steps are described in the instruction sheet supplied Removing the Mowing Head e Block the shaft e Unscrew the mowing head clockwise Fitting Mowing Head without Screw Mounting Keep the instruction leaflet for the mowing head in a safe place 12 FS 40 FS 40 C FS 50 FS 50 C STIHL AutoCut C 5 2 FA g 2 lt a amp Slip the mowing head 2 on to the shaft as AutoCut 5 2 Turn the spool 9 clockwise until the two arrow heads line up secure the spool in this position Insert the cap 8 in the spool press it down as far as stop and turn it clockwise at the same time Turn the cap until you feel resistance and then tighten it down firmly by hand FS 40 FS 40 C FS 50 FS 50 C STIHL PolyC
3. FS 40 FS 40 C FS 50 FS 50 C As soon as the engine runs e Press down the throttle trigger lockout and open the throttle the choke knob moves to the run position I After a cold start warm up the engine by opening the throttle several times warnine Make sure the carburetor is correctly adjusted The cutting attachment must not rotate when the engine is idling The machine is now ready for operation Shut off the engine Move the stop switch in the direction of 0 the engine stops release the stop switch it springs back to the run position Other Hints on Starting Engine stalls in cold start position or under acceleration e Move the choke knob to X and continue cranking until the engine runs English Engine does not start in warm start position e Move the choke knob to and continue cranking until the engine runs If the engine does not start Check that all settings are correct Check that there is fuel in the tank and refuel if necessary Check that the spark plug boot is properly connected e Repeat the starting procedure Fuel tank run until completely dry e After refueling press the manual fuel pump bulb at least five times even if the bulb is filled with fuel Set the choke knob to suit the engine temperature Start the engine 19 English Operating Instructions During break in period Cleaning the Air Filter If there is a noticeable lo
4. emergency switch off the engine immediately move the stop switch in the direction of 0 lt q 15m 50ft 2 A The cutting attachment may catch and fling objects a great distance and cause injury therefore do not allow any other persons within a radius of 15 meters of your own position To reduce the risk of damage to property also maintain this distance from other objects vehicles windows Even maintaining a distance of 15 meters or more cannot exclude the potential danger The correct engine idle speed is important to ensure that the cutting attachment stops rotating when you let go of the throttle trigger English Check and correct the idle speed setting regularly If the cutting attachment continues to rotate when the engine is idling have the machine checked by your servicing dealer STIHL recommends a STIHL servicing dealer Take special care in slippery conditions ice wet ground snow on slopes or uneven ground Watch out for obstacles Roots tree stumps or holes which could cause you to trip or stumble Make sure you always have good balance and secure footing Always stand on the ground while working never on a ladder work platform or any other insecure support 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 tirednes
5. man ual before first use and keep it in a safe place for future reference Non observance of the instruction manual 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 unit 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 FS 40 FS 40 C FS 50 FS 50 C Do not lend or rent your power tool without the instruction manual Be sure than anyone using your power tool 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 you 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
6. 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 FS 40 FS 40 C FS 50 FS 50 C Your power tool is a one person unit To reduce the risk of injury from thrown objects do not allow other persons within a radius of 15 meters of your own position even when starting JA Do nat drop start the power tool start the engine as described in the instruction manual To reduce the risk of injury avoid contact with the cutting attachment Note that the cutting attachment continues to run for a short period after you let go of the throttle trigger flywheel effect Check idle speed setting The cutting attachment must not rotate when the engine is idling with the throttle trigger released To reduce the risk of fire keep hot exhaust gases and hot muffler away from easily combustible materials e g wood chips bark dry grass fuel Holding and Controlling the Unit Always hold the power tool firmly with both hands on the handles Make sure you always have good balance and secure footing FS 40 FS 40 C FS 50 FS 50 C 546BA002 KN Left hand on loop handle right hand on control handle even if you are left handed During Operation In the event of impending danger or in an
7. the tank e Position the machine so that the filler cap is facing up A number of different filler caps are installed as standard at the factory z x y lt ao A gt Cliplock filler cap bayonet type 15 English 002BA419 KN 001BA224 KN 001BA221 KN Threaded filler cap Remove the cap e While holding the cap depressed turn it clockwise until it engages in Opening tank cap with hinged grip Filling up with fuel position Take care not to spill fuel while fueling and do not overfill the tank STIHL recommends you use the STIHL filler nozzle for fuel special accessory e Filling up with fuel Closing tank cap with hinged grip e Swing the grip to the upright position 001BA222 KN 001BA218 KN e Foldthe grip flush with the top of the cap Checking security of cap FA x o A N lt a o 3S 2 x D N lt a Q So Grip must be vertical e Fit the cap in the opening the 4 2 e Rotate the cap about 1 4 turn marks on the cap and filler neck 3 counterclockwise must line up The lug on the grip must fully e Press the cap down as far as stop engage the recess arrow 16 FS 40 FS 40 C FS 50 FS 50 C 001BA225 KN e Grip the cap it is properly locked if it cannot be turned or removed If the cap can be turned or removed Bottom of cap is twisted in relation to top A x N N N lt a o Left Bottom of cap twisted Right B
8. 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 unit checked by your servicing dealer Do not operate your power tool with the choke lever in the warm start position the engine speed cannot be controlled in this position To reduce the risk of injury from thrown objects never operate the power tool without the proper deflec tor for the type of cutting attachment being used Inspect the work area Stones pieces of metal or other solid objects may be thrown more than 15 meters and cause per sonal injury or damage the cutting attachment gt and property e g parked 4 vehicles windows AN Special care must be taken when working in difficult over grown terrain When cutting high scrub under bushes and hedges Keep cutting attachment at a minimum height of 15 cm to avoid harming small animals Always shut off the engine before leaving the unit unattended Check the cutting attachment at regular short intervals during operation or immediately if there is a noticeable change in cutting behavior Turn off the engine Hold the unit firmly and wait for the cutting attac
9. 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 several 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 FS 40 FS 40 C FS 50 FS 50 C 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 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 u
10. x Complete machine Clean x Control handle Check operation x x Clean x x Air filter Replace x Check x Manual fuel pump if fitted Have repaired by servicing dealer x Check x Pickup body in fuel tank Replace x x Fuel tank Clean x x Check idle adjustment the cutting x x Carburetor attachment must not rotate Readjust idle x Readjust electrode gap x Spark plug Replace after every 100 operating hours Visual inspection x Cooling inlets Clean x All accessible screws and nuts not adjust Retighten x ing screws Visual inspection x x Cutting attachment Replace x Check tightness x x Safety labels Replace x 1 STIHL recommends an authorized STIHL servicing dealer 28 FS 40 FS 40 C FS 50 FS 50 C 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 th
11. 681BA024 KN Hold the mowing head steady Rotate the spool counterclockwise until the shortest line is about 10 cm 4 in If necessary cut the longer line toa length of about 10 cm 4 in The mowing head is now full English STIHL AutoCut 5 2 Removing remaining nylon line z S S 2 lt a e Open the mowing head hold it steady with one hand and turn the cap 1 counterclockwise e Disengage the spool 2 take it out of the mowing head and remove the remaining line Winding line onto spool A prewound spool special accessory may be used as an alternative to the following procedure 25 English 681BA009 KN 681BA010 KN 681BA011 KN e Use green coded nylon line with a e Straighten out the nylon lines and e Thread the ends of the lines 6 diameter of 2 0 mm 0 08 in wind them tightly on to the spool through the sleeves 7 and push one nylon line in each chamber the spool 2 into the head so that it e Cut two 3 m 9ft 9in lengths of me snaps into position nylon line from the reel special e Engage the ends of the lines in the accessory notches 2 The nylon lines must disengage from the a F notches 5 as the spool is pushed into e Insert the ends of each line 3 in the Assembling the mowing head position holes 4 in the spool e Pull out the ends of the lines as far e Bend the ends of the lines over the ka edge of the holes
12. IHL AG amp Co KG Badstr 115 D 71336 Waiblingen confirms that the product described below Trimmer STIHL FS 40 FS 40C FS 40 C E FS 50 FS 50 L FS 50C FS 50 C E FS 50 C E L 4144 27 2 cm conforms to the provisions of Directives 2006 42 EC 2004 108 EC and 2000 14 EC and has been developed and manufactured in compliance with the following standards in the versions valid at the time of production EN ISO 11806 1 EN 61000 6 1 EN 55012 The measured and guaranteed sound power levels were determined according to Directive 2000 14 EC Annex V using the ISO 10884 standard Measured sound power level 107 dB A 108 dB A Category Make Model Serial identification Displacement all FS 40 all FS 50 FS 40 FS 40 C FS 50 FS 50 C Guaranteed sound power level all FS 40 109 dB A all FS 50 110 dB A Technical documents deposited at ANDREAS STIHL AG amp Co KG Produktzulassung Product Licensing The year of manufacture and serial number are applied to the product Done at Waiblingen 15 08 2014 ANDREAS STIHL AG amp Co KG ER m S Thomas Elsner Director Group Product Management CE FS 40 FS 40 C FS 50 FS 50 C English 33 0458 546 0121 D englisch 0458 546 0121 D
13. S 50 C English Approved Combinations of Cutting Attachment Deflector Handle and Harness Cutting Attachment Deflector Handle Shoulder Strap Harness Approved Combinations Deflector Select correct combination from the 5 Deflector with blade for mowing table according to the cutting heads attachment you intend to use Handle warnine For safety reasons no other 6 Loop handle combinations are permitted risk of accidents Shoulder Strap Cutting Attachments 7 Shoulder strap may be used Mowing heads 1 STIHL AutoCut C 5 2 2 STIHL AutoCut 5 2 3 STIHL FixCut 5 2 4 STIHL PolyCut 6 3 FS 40 FS 40 C FS 50 FS 50 C 9 English Mounting the Loop Handle Mounting the Deflector Your new power tool comes with the loop handle mounted on the drive tube 5 but it must be turned and lined up to suit your requirements 546BA004 KN Adjusting the loop handle The loop handle can be adjusted to suit the height and reach of the operator and the application by changing distance A Recommended distance A about 15 cm 232BA066 KN Slide the handle to the required position 546BA003 KN e Tighten down the screw or star knob so that the handle cannot be rotated zZ x ite 2 lt a D Versions with screw FS 40 on the drive tube e Use a screwdriver or the e Push the deflector 1 over the combination wrench to loosen the clamp 2 as far as stop scr
14. STIHL STIHL FS 40 50 parte enine Original Instruction Manual Printed on chlorine free paper ANDREAS STIHL AG amp Co KG 2015 0458 546 0121 D VA3 A15 0000001049_019_GB Printing inks contain vegetable oils paper can be recycled Contents Guide to Using this Manual Safety Precautions and Working Techniques Approved Combinations of Cutting Attachment Deflector Handle and Harness Mounting the Loop Handle Mounting the Deflector Mounting the Cutting Attachment Fuel Fueling Starting Stopping the Engine Operating Instructions Cleaning the Air Filter Adjusting the Carburetor Spark Plug Engine Running Behavior Rewind Starter Storing the Machine Maintaining the Mowing Head Maintenance and Care Minimize Wear and Avoid Damage Main Parts Specifications Maintenance and Repairs Disposal EC Declaration of Conformity STIHL FS 40 FS 40 C FS 50 FS 50 C 10 10 11 14 15 18 20 20 21 21 22 22 23 23 28 29 30 31 32 32 32 English Dear Customer Thank you for choosing a quality engineered STIHL product It 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 product Please contact your dealer or our sales company if you have any queries concerning this product Your a Dr Nikolas Stihl This instruction manual is protected by copyright All right
15. d Replacing nylon line STIHL FixCut A warnine To reduce the risk of injury always shut off the engine before refilling the mowing head e Fit nylon line in mowing head as described in the instructions supplied STIHL AutoCut C 5 2 Disassembling the mowing head and removing remaining nylon line In normal operation the supply of nylon line in the head is used up almost completely 24 f z amp a a lt a Hold the mowing head steady and rotate the cap 1 counterclockwise until it can be removed Pull the spool 2 out of the mowing head 3 and remove the remaining line Assembling the mowing head ES Y z o 681BA022 KN e Fit the empty spool in the mowing head If the spring 4 has popped out e push it into the spool 2 until it engages in position with an audible click e Mount the mowing head see Mounting the Mowing Head FS 40 FS 40 C FS 50 FS 50 C Winding line onto spool z g 2 a S lt a amp Use green coded nylon line with a diameter of 2 0 mm 0 08 in Cut two 2 m 6ft 6in lengths of nylon line from the reel special accessory Rotate the spool 2 counterclockwise until the two arrow points are in alignment Push the straight end of each line through one sleeve 5 in the mowing head 3 until you feel a noticeable resistance and then continue pushing as far as stop FS 40 FS 40 C FS 50 FS 50 C
16. e 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 FS 40 FS 40 C FS 50 FS 50 C English servicing dealer STIHL dealers are Rewind starter regularly given the opportunity to attend training courses and are supplied with the necessary technical information Spark plug If these maintenance operations are not carried out as specified the user assumes 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 b
17. e replaced in good time Among other parts this includes Cutting attachments all types Mounting hardware for cutting attachments rider plate nut etc Deflectors for cutting attachments Clutch Filters air fuel 29 English Main Parts Loop handle Carrying ring Stop switch Throttle trigger lockout Throttle trigger Carburetor adjusting screws Choke lever Air filter cover 9 Spark plug boot 10 Machine support 11 Manual fuel pump 12 Tank cap 13 Tank 14 Starter grip 15 Muffler 16 Mowing head 17 Line limiting blade 18 Deflector 19 Drive tube Serial number ONOahWDND 546BA015 KN 30 FS 40 FS 40 C FS 50 FS 50 C Specifications Engine Single cylinder two stroke engine FS 40 FS 40 C Displacement 27 2 cc Bore 34 mm Stroke 30 mm Engine power to 0 7 kW 1 bhp ISO 8893 at 8 500 rpm Idle speed 2 800 rpm Cut off speed rated 10 000 rpm Max output shaft speed cutting attachment 10 600 rpm FS 50 FS 50 C Displacement 27 2 cc Bore 34 mm Stroke 30 mm Engine power to 0 8 kW 1 1 bhp ISO 8893 at 8 500 rpm Idle speed 2 800 rpm Cut off speed rated 10 000 rpm Max output shaft speed cutting attachment 10 600 rpm Ignition System Electronic magneto ignition Spark plug resistor type Electrode gap NGK CMR 6 H 0 5 mm FS 40 FS 40 C FS 50 FS 50 C Fuel System All position diaphragm carbur
18. etor with integral fuel pump Fuel tank capacity 340 cc 0 34 Weight Dry without cutting attachment and deflector FS 40 4 4 kg FS 40 C with ErgoStart 4 5 kg FS 50 4 4 kg FS 50 with long shaft 4 5 kg FS 50 C with ErgoStart 4 5 kg FS 50 C with ErgoStart and long shaft 4 6 kg Dimensions without cutting attachment FS 40 1450 mm FS 40 C with ErgoStart 1450 mm FS 50 1450 mm FS 50 with long shaft 1650 mm FS 50 C with ErgoStart 1450 mm FS 50 C with ErgoStart and long shaft 1650 mm Noise and Vibration Data Noise and vibration data measurements include idling and rated maximum speed with the same duration of exposure For further details on compliance with Vibration Directive 2002 44 EC see www stihl com vib English Sound pressure level L to ISO 22868 FS 40 FS 40 C FS 50 FS 50 C 94 dB A 93 dB A Sound power level Ly to ISO 22868 FS 40 FS 40 C FS 50 FS 50 C 107 dB A 108 dB A Vibration measurement any eq to ISO 22867 Handle Handle left right FS 40 FS 40 C 7 0 m s 6 4 m s FS 50 FS 50 C 6 0 m s 5 7 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 REACH REACH is an EC regulation and stands for the Registration Evaluation Authorisation and Restriction of Chemical substances For
19. ew 1 on the handle e Insert the nut 3 in the hex recess in Versions with star knob FS 50 nn ne RS SSR moles e Loosen the star knob 2 on the e Insert the screw 4 with washer and handle tighten it down firmly All versions z x x 2 lt a it o e Turn the handle to the vertical position 10 FS 40 FS 40 C FS 50 FS 50 C English 3 p Thrust plat Block the shaft Mounting the Cutting AA ooo ran Attachment Placing power tool on the ground 546BA016 KN e Switch offthe engine 546BA017 KN Y Lay your trimmer on its back with the loop handle and shroud pointing 8 down and the output shaft facing up a The thrust plate is shipped with the e To block the shaft insert a suitable PolyCut 6 3 and FixCut 5 2 It is only tool 5 through the holes 6 in the required for these mowing heads deflector and thrust plate turn the thrust plate back and forth if STIHL AutoCut 5 2 mowing head necessary STIHL AutoCut C 5 2 mowing head e Pull the thrust plate 1 if fitted off Fitting Mowing Head with Screw the shaft 2 Mounting STIHL PolyCut 6 3 mowing head STIHL FixCut 5 2 mowing head Keep the instruction leaflet for the e Slip the thrust plate 1 over the mowing head in a safe place shaft 2 and engage the hex recess 3 on the external hexagon 4 FS 40 FS 40 C FS 50 FS 50 C 11 English
20. g must be sturdy but allow complete free dom of movement Wear snug fitting clothing an overall and jacket combi nation 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 Wear sturdy shoes with non slip soles English warnine To reduce the risk of eye injuries wear snug fitting OO safety glasses in accord ance with European best Standard EN 166 Make sure the safety glasses are a good fit Wear a face shield and make sure it is a good fit A face shield alone does not provide adequate eye protection Wear hearing protection e g earplugs or ear muffs Wear robust work gloves made of durable material e g leather STIHL offers a comprehensive range of personal protective clothing and equipment Transporting the Power Tool z 3 2 a oO wo Always turn off the engine Carry the unit properly balanced by the drive tube or loop handle English In vehicles Properly secure your power tool to prevent turnover fuel spillage and damage 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 t
21. he mowing head for signs of wear before replacing the nylon line Awarnine If there are signs of serious wear replace the complete mowing head The nylon mowing line is referred to as nylon line or line in the following The mowing head is supplied with illustrated instructions for replacing the nylon line Keep the instructions for the mowing head in a safe place e f necessary remove the mowing head English Adjusting nylon line STIHL AutoCut 1 im ML MA Me N y Y My _ 232BA007 KN e Hold the rotating mowing head above the ground tap it on the ground once about 3 cm 1 2 in of fresh line is advanced e The blade 1 on the deflector 2 trims surplus line to the correct length avoid tapping the mowing head more than once at a time Line feed operates only if both lines still have a minimum length of 2 5 cm 1 in If the line is shorter than 2 5 cm 1 in warnine To reduce the risk of injury always shut off the engine before adjusting the mowing line by hand 23 English Turn the machine over Press down the cap on the spool as far as stop e Pull the ends of the lines out of the spool If the spool is empty refill with nylon line All other mowing heads Refer to the instructions supplied with the mowing head A warnine To reduce the risk of injury always shut off the engine before adjusting the mowing line by han
22. hment to come to a standstill Check condition and tightness look for cracks Replace damaged cutting attachments immediately even if they have only superficial cracks Clean grass and plant residue off the cutting attachment mounting at regular intervals remove any build up of material from the cutting attachment and deflector To reduce the risk of injury shut off the engine before replacing the cutting attachment Do not continue using or attempt to repair damaged or cracked cutting attachments by welding straightening or modifying the shape out of balance This may cause parts of the cutting attachment to come off and hit the operator or bystanders at high speed and result in serious or fatal injuries When using mowing heads Use only the deflector with properly mounted line limiting blade to ensure the mowing lines are automatically trimmed to the approved length FS 40 FS 40 C FS 50 FS 50 C To reduce the risk of injury always turn off the engine before adjusting the nylon line of manually adjustable mowing heads Using the unit with over long nylon cutting lines reduces the engine s operating speed The clutch then slips continuously and this causes overheating and damage to important components e g clutch polymer housing components and this can increase the risk of injury from the cutting attachment rotating while the engine is idling Vibrations Prolonged use of the power
23. information on compliance with the REACH regulation EC No 1907 2006 see www stihl com reach 31 English 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 dealers 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 STIHL logo and the STIHL parts symbol 57 the symbol may appear alone on small parts 32 Disposal Observe all country specific waste disposal rules and regulations A x o N S lt a 3S STIHL products must not be thrown in the garbage can Take the product accessories and packaging to an approved disposal site for environment friendly recycling Contact your STIHL servicing dealer for the latest information on waste disposal EC Declaration of Conformity ANDREAS ST
24. lugs of the type approved by STIHL see Specifications Removing the Spark Plug e Shut off the engine g y lt ao N 3 e Remove the spark plug boot 1 e Unscrew the spark plug 2 English Checking the spark plug A 000BA039 KN A e Clean dirty spark plug e Check electrode gap A and readjust if necessary see Specifications e Rectify the problems which have caused fouling of the spark plug Possible causes are Too much oil in fuel mix Dirty air filter Unfavorable running conditions x te t lt faa S Awarnine 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 21 English Installing the Spark Plug Screw the spark plug into the cylinder e Press the boot firmly onto the spark plug 22 Engine Running Behavior If engine running behavior is unsatisfactory even though the air filter is clean and the carburetor is properly adjusted the cause may be the muffler Have the muffler checked for contamination carbonization by your servicing dealer STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer Rewind Starter To help prolong the wear life of the starter rope observe the following points e Pull the starter rope onl
25. ne oils are not available in all markets 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 FS 40 FS 40 C FS 50 FS 50 C 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 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 nat store fuel mix for longer than 30 days Exposure to light the sun low or high temperatures can quickly make the fuel mix unusable STIHL MotoMix may be stored for up to 2 years without any problems e Thoroughly shake the mixture in the canister before fueling your machine warnine Pressure may build up in the canister open it carefully e Clean the fuel tank and canister from time to time FS 40 FS 40 C FS 50 FS 50 C Dispose of remaining fuel and cleaning fluid properly in accordance with local regulations and environmental requirements English Fueling Preparations o e Before fueling clean the filler cap and the area around it to ensure that no dirt falls into
26. o 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 N down the screw type fuel Oy cap as securely as a possible n After fueling insert the fuel cap with hinged grip bayonet type cap cor rectly in the opening turn it clockwise as far as stop and fold the grip down This reduces the risk of unit vibrations causing the fuel cap to loosen or come off and spill quantities of fuel To reduce the risk of serious or fatal burn injuries check for fuel leakage If fuel leakage is found do not start or run the engine until leak is fixed Before Starting Check that your power tool is properly assembled and in good condition refer to appropriate chapters in the instruction manual Check the fuel system for leaks paying special attention to visible parts such as the tank cap hose connections and the manual fuel pump on machines so equipped If there are any leaks or damage do not start the engine risk of fire Have your machine repaired by a servicing dealer before using it again Use only an approved combination of cutting attachment deflector handle and harness All parts must be assembled properl
27. ontact 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 uses STIHL HP Ultra two stroke engine oil for an extra long engine life MotoMix is not available in all markets Mixing Fuel E notice 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 gasoline Elion A few tankfuls of leaded gasoline will greatly reduce the efficiency of the catalytic converter Gasoline with an ethanol content of more than 10 can cause running problems in engines with a manually adjustable carburetor and should not be used in such engines Engines equipped with M Tronic deliver full power when run on gasoline with an ethanol content of up to 25 E25 Engine oil Use only high quality two stroke engine oil preferably STIHL HP HP Super or HP Ultra which are specially formulated for use in STIHL engines HP Ultra guarantees high performance and a long engine life These engi
28. ottom of cap correctly positioned FS 40 FS 40 C FS 50 FS 50 C 001BA226 KN Place the cap on the opening and rotate it counterclockwise until it engages the filler neck e Continue rotating the cap counterclockwise about a quarter turn this causes the bottom of the cap to be turned to the correct position e Turn and lock the cap clockwise see sections on Closing and Checking security of cap Opening screw type tank cap 2 x El lt a A e o e Turn the cap counterclockwise until it can be removed from the tank opening Remove the cap English Filling up with fuel Take care not to spill fuel while fueling and do not overfill the tank STIHL recommends you use the STIHL filler nozzle special accessory Closing screw type tank cap e Place the cap in the opening Turn the cap clockwise as far as stop and tighten it down as firmly as possible by hand 17 English Starting Stopping the Engine Controls Version with Loop Handle 546BA007 KN 1 Throttle trigger lockout 2 Throttle trigger 3 Stop switch with Run and 0 Stop positions Function of stop switch and ignition system The stop switch is normally in the Run position i e when it is not depressed The ignition is switched on the engine is ready to start If the stop switch is moved to the 0 position the ignition is switched off The ignition is switched on again automatically afte
29. pacemakers STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer to reduce any health risk Do not operate the power tool if you are under the influence of any substance drugs alcohol which might impair vision dexterity or judgment Depending on the cutting attachment fitted use your trimmer only for cutting grass wild growth and similar materials It must not be used for any other purpose because of the increased risk of accidents and damage to the machine Never attempt to modify your power tool in any way since this may result in accidents or damage to the machine Only use cutting attachments 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 FS 40 FS 40 C FS 50 FS 50 C servicing dealer Use only high quality cutting attachments and accessories in order to avoid the risk of accidents and damage to the machine STIHL recommends the use of genuine STIHL cutting attachments and accessories They are specifically designed to match the product and meet your performance requirements The deflector on this power tool cannot protect the operator from all objects thrown by the cutting attachment stones glass wire etc Such objects may ricochet and then hit the operator Clothing and Equipment Wear proper protective clothing and equipment Clothin
30. r the engine stops 18 Starting the Engine e Press the manual fuel pump bulb 4 at least five times even if the bulb is filled with fuel Cold engine cold start 547BA016 KN _ 7 Press in the choke lever 5 and turn itto atthe same time Warm engine warm start zZ x N o lt a D e Press in the choke lever 5 and turn it to at the same time Also use this setting if the engine has been running but is still cold Cranking e Place the unit on the ground It must rest securely on the engine support and the deflector Check that the cutting attachment is not touching the ground or any other obstacles Make sure you have a safe and secure footing Hold the unit firmly on the ground with your left hand and press down do not touch the throttle trigger or lockout lever B norice Do not stand or kneel on the drive tube FS 40 FS 40 C FS 50 FS 50 C z o N S 2 a 3 e Hold the starter grip with your right hand Version without ErgoStart e Pull the starter grip slowly until you feel it engage and then give it a brisk strong pull Version with ErgoStart e Pull the starter grip steadily Elone Do not pull out the starter rope all the way it might otherwise break e Donotlet the starter grip snap back Guide it slowly back into the housing so that the starter rope can rewind properly Continue cranking until engine runs
31. s or exhaustion Work calmly and carefully in daylight conditions and only when visibility is good Stay alert so as not to endanger others English 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 Operate your power tool so that it produces a minimum of noise and emissions do not run the engine unnecessarily accelerate the engine only when working 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 The dusts vapor and smoke produced during operation may be dangerous to health If the work area is very dusty or smoky wear a respirator If your power
32. s reserved especially the rights to reproduce translate and process with electronic systems English Guide to Using this Manual Pictograms The meanings of the pictograms attached to the machine are explained in this manual Depending on the model concerned the following pictograms may be attached to your machine mi y Operate decompression valve Aw Fuel tank fuel mixture of gasoline and engine oil Manual fuel pump Operate manual fuel pump Tube of grease Intake air Summer operation Intake air Winter operation Handle heating P N a N Pictograms All the pictograms attached to the machine are shown and explained in this manual Symbols in text Awaenine Warning where there is a risk of an accident or personal injury or serious damage to property El notice 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 covered in this manual Safety Precautions and Working Techniques Some special safety pre cautions have to be observed when working with this power tool because of the very high speed of the cutting attachment It is important that you read the instruction
33. se of genuine STIHL replacement parts These parts are specifically designed to match your machine model and meet your performance requirements To reduce the risk of injury from unintentional engine startup always shut off the engine and disconnect the spark plug boot before performing any repairs maintenance or cleaning work Exception Carburetor and idle speed adjustments English Do not turn the engine over on the starter with the spark plug boot or spark plug removed 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 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 Symbols on Deflectors z x Q lt a a oO o An arrow on the deflector inside and outside shows the correct direction of rotation of the cutting attachments English Mowing Head with Nylon Lines AEM O boca E pr A EE LE TN UU HAN nl 100000 IIA pl NA A cll UNUUNU ALU N IAE Cb Cd nn MULLIN
34. ss of engine power A factory new machine should not be run at high revs full throttle off load for the first three tank fillings This avoids unnecessary 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 engine are greater during this period The engine develops its maximum power after about 5 to 15 tank fillings During Operation After a long period of full throttle operation allow the engine to run for a short while at idle speed so that engine o heat can be dissipated by the flow of cooling air This protects engine e mounted components ignition carburetor from thermal overload After Finishing Work Storing for a short period Wait for the engine to cool down Empty the fuel tank and keep the machine in a dry place well away from sources of ignition until you need it again For longer out of service periods see Storing the Machine 20 z x y A gt lt ao 3 Move the choke lever 1 to Turn the screw 2 in the filter cover 3 counterclockwise until the cover is loose Ease the filter cover 3 over the choke lever and lift it away Clean away loose dirt from around the filter zZ x 5 oN 2 lt a D Reach into the recess 4 in the filter housing and take out the felt filter 5 e Fita new felt filter element 5 As a temporary measure you can knock it out on
35. the palm of your hand or blow it out with compressed air Do not wash once Replace damaged parts e Fit the felt filter 5 in the filter housing make sure it is properly seated the arrow points to the recess e Move the choke lever 1 to Z e Fit the filter cover in position making sure the screw is square Tighten down the screw FS 40 FS 40 C FS 50 FS 50 C Adjusting the Carburetor z x S 3 lt ra ite S The carburetor has been set at the factory to provide an optimum fuel air mixture under most operating conditions Adjusting Idle Speed Engine stops while idling e Warm up the engine for about 3 minutes e Turn the idle speed screw LA slowly clockwise until the engine runs smoothly the cutting attachment must not run Cutting attachment runs when engine is idling e Turn the idle speed screw LA counterclockwise until the cutting attachment stops moving and then rotate the screw another 1 2 to 3 4 turn in the same direction warnine If the cutting attachment continues to run when the engine is idling have your machine checked and repaired by your servicing dealer FS 40 FS 40 C FS 50 FS 50 C Spark Plug e Ifthe engine is down on power difficult to start or runs poorly at idle speed first check the spark plug e Fita new spark plug after about 100 operating hours or sooner if the electrodes are badly eroded Install only suppressed spark p
36. to form a hook ES NOTICE as stop Check that the spring is installed see Mount the mowing head on the Mounting the Mowing Head machine Replacing Cutting Blades STIHL PolyCut Always check the mowing head for signs of wear before installing new cutting blades 26 FS 40 FS 40 C FS 50 FS 50 C Aiwannnc If there are signs of serious wear replace the complete mowing head The thermoplastic cutting blades are referred to as blades in the following The mowing head is supplied with illustrated instructions for replacing the blades Keep the instructions for the mowing head in a safe place A warnine To reduce the risk of injury always shut off the engine before installing the blades Remove the mowing head e Replace blades as shown in the illustrated instructions e Mount the mowing head on the machine FS 40 FS 40 C FS 50 FS 50 C English 27 English Maintenance and Care The following intervals apply to normal operating conditions only If your daily work ing time is longer or operating conditions are difficult very dusty work area etc T a shorten the specified intervals accordingly 3 3 E x 2 o 10 S 2 a E E 2 ke E 2 O E A o D g gt 3 2 g T z x gt 3 g o E 2 g e Y a D 5 a E d ES ES Visual inspection condition leaks x
37. ut 6 3 106 681BA019 KN Fit the thrust plate on the shaft Insert the nut 10 in the mowing head Screw the mowing head 11 clockwise on to the shaft 5 as far as stop Block the shaft Tighten down the mowing head firmly Amaro If the mounting nut has become too loose fit a new one E orice Remove the tool used to block the shaft English STIHL FixCut 5 2 232BA074 KN Slip the thrust plate 2 over the shaft e Place the mowing head on the thrust plate 2 Awarnine Collar see arrows must engage the mowing head s mounting hole e Push the thrust washer 3 over the shaft 1 so it is seated on the base e Block the shaft e Use the combination wrench 5 special accessory to screw the mounting nut 4 on to the output shaft and tighten it down firmly A warnine If the mounting nut has become too loose fit a new one 13 English Blvorice Remove the tool used to block the shaft Remove the mowing head STIHL AutoCut e Hold the mowing head steady e Unscrew the cap counterclockwise STIHL PolyCut e Block the shaft e Unscrew the mowing head counterclockwise STIHL FixCut e Block the shaft e Use the combination wrench special accessory to loosen and unscrew the mounting nut counterclockwise from the output shaft 14 Fuel Your engine requires a mixture of gasoline and engine oil Amaro For health reasons avoid direct skin c
38. y and securely To reduce the risk of injury never use metal cutting attachments The stop switch must move easily to 0 Check smooth action of choke knob throttle trigger lockout and throttle trigger the throttle trigger must return automatically to the idle position The choke lever must spring back from the and Z positions to the run position I when the throttle trigger lockout and throttle trigger are squeezed Check that the spark plug boot is secure a loose boot may cause arcing that could ignite combustible fumes and cause a fire Check cutting attachment for correct and secure assembly and good condition Check protective devices e g deflector for cutting attachment for damage or wear Always replace damaged parts Never operate the unit with a damaged deflector Never attempt to modify the controls or safety devices in any way Keep the handles dry and clean free from oil and dirt for safe control of the power tool Adjust the harness and handle s to suit your height and reach To reduce the risk of accidents do not operate your power tool if it is damaged or not properly assembled If you use a shoulder strap or full harness Practice removing and putting down the power tool as you would in an emergency To avoid damage do not throw the machine to the ground when practicing Starting the Engine Start the engine at least 3 meters from the fueling
39. y in the direction specified e Donot pull the rope over the edge of the guide bushing e Do not pull out the rope more than specified e Donot allow the starter grip to snap back guide it back into the housing slowly see chapter on Starting Stopping the Engine Have a damaged starter rope replaced by your dealer before it breaks completely STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer FS 40 FS 40 C FS 50 FS 50 C Storing the Machine For periods of about 3 months or longer e Drain and clean the fuel tank in a well ventilated area e Dispose of fuel properly in accordance with local environmental requirements e Run the engine until the carburetor is dry this helps prevent the carburetor diaphragms sticking together e Remove clean and inspect the cutting attachment Coat metal cutting attachments with corrosion inhibitor e Thoroughly clean the machine pay special attention to the cylinder fins and air filter Store the machine in a dry and secure location out of the reach of children and other unauthorized persons FS 40 FS 40 C FS 50 FS 50 C Maintaining the Mowing Head Placing power tool on the ground 546BA016 KN Switch off the engine e Lay your trimmer on its back with the loop handle and shroud pointing down and the output shaft facing up Replacing nylon line Always check t
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