STIHL FS 40, 50 Instruction Manual
English © ANDREAS STIHL AG & Co. KG, 2020 0458-546-0121-D. VA6.G20. 0000001049_030_GB Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
English Guide to Using this Manual Symbols in text WARNING 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. Fuel tank; fuel mixture of gasoline and engine oil Operate decompression valve Manual fuel pump Operate manual fuel pump Warning where there is a risk of an accident or personal injury or serious damage to property.
English 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 pacemakers.
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. Before Starting – Check that your power tool is properly assembled and in good condition – refer to appropriate chapters in the instruction manual. Check protective devices (e.g. deflector for cutting attachment) for damage or wear. Always replace damaged parts.
English 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).
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 locations, even if your model is equipped with a catalytic 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.
English 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.
English STIHL PolyCut 6-3 Mowing Head with Polymer Blades Mowing Head with Nylon Lines WARNING Nylon line achieves a soft cut for edging and trimming around fence posts, trees, etc. – less risk of damaging tree bark. WARNING To reduce the risk of injury, never use steel wire in place of the nylon cutting line. 2 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.
English Approved Combinations of Cutting Attachment, Deflector, Handle and Harness hn ur /L E IN 1 4 Deflector 2 3 Handle Harness 7 8 6 0000-GXX-0401-A3 E IN /L ur hn Sc Sc 1 2 Cutting Attachment 5 Approved Combinations Deflector Select correct combination from the table according to the cutting attachment you intend to use. 6 Deflector with blade, for mowing heads Handle WARNING For safety reasons no other combinations are permitted – risk of accidents.
English Mounting the Loop Handle Mounting the Deflector A 232BA066 KN 1 The loop handle can be adjusted to suit the height and reach of the operator and the application by changing distance (A). 1 2 546BA003 KN Recommended distance (A): about 15 cm Versions with screw (FS 40) N Use a screwdriver or the combination wrench to loosen the screw (1) on the handle. N Slide the handle to the required position.
English Thrust Plate Mounting the Cutting Attachment Blocking the Shaft 1 Placing power tool on the ground 6 3 546BA016 KN 2 N Lay your trimmer on its back with the loop handle and shroud pointing down and the output shaft facing up. 6 The thrust plate (1) is shipped with the DuroCut 5-2 and PolyCut 6-3. It is only required for these mowing heads. STIHL AutoCut 5-2 mowing head, STIHL AutoCut C 5-2 mowing head N Pull the thrust plate (1), if fitted, off the shaft (2).
English Fitting Mowing Head without Screw Mounting 8 Keep the instruction leaflet for the mowing head in a safe place. 2 STIHL AutoCut 5-2 1 7 5 Fit the thrust plate N Turn the mowing head anticlockwise on the shaft (1) as far as it will go N Retain the shaft N Tighten the mowing head NOTICE Remove the tool that was used to block the shaft.
English STIHL PolyCut 6-3 STIHL AutoCut C 5-2 Remove the mowing head. STIHL AutoCut 10 8 2 E IN r/L nu ch S E IN r/L nu 1 Slip the mowing head (2) on to the shaft – as AutoCut 5-2. N Turn the spool (9) clockwise until the two arrow heads line up – secure the spool in this position. N N 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.
English Fuel Your engine requires a mixture of gasoline and engine oil. WARNING 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 uses STIHL HP Ultra two-stroke engine oil for an extra long engine life. MotoMix is not available in all markets.
English Filling up with fuel Fueling Starting / Stopping the Engine Take care not to spill fuel while fueling and do not overfill the tank. STIHL recommends you use the STIHL filler nozzle (special accessory). Preparations Controls Version with loop handle Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank. N Position the machine so that the filler cap is facing up.
English Also use this setting if the engine has been running but is still cold. Starting the Engine Cranking Press the manual fuel pump bulb (4) at least five times – even if the bulb is filled with fuel. N 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. N Make sure you have a safe and secure footing.
English Engine does not start in warm start position < As soon as the engine runs N Move the choke knob to g and continue cranking until the engine runs. 547BA021 KN If the engine does not start N Press down the throttle trigger lockout and open the throttle – the choke lever moves to the run position F. After a cold start, warm up the engine by opening the throttle several times. N Check that all settings are correct. N Check that there is fuel in the tank and refuel if necessary.
English Cleaning the Air Filter 3 N Reach into the recess (4) in the filter housing and take out the felt filter (5). N Fit a new felt filter element (5). As a temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not wash. 547BA022 KN 2 N Move the choke lever (1) to <. N Turn the screw (2) in the filter cover (3) counterclockwise until the cover is loose. N Ease the filter cover (3) over the choke lever and lift it away.
English Checking the Spark Plug N If the engine is down on power, difficult to start or runs poorly at idle speed, first check the spark plug. N Fit a new 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 "Specifications". Removing the Spark Plug N Shut off the engine. 547BA041 KN 2 N Unscrew the spark plug (2). Installing the Spark Plug A N Clean dirty spark plug.
English Storing the Machine 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. For periods of about 3 months or longer N Drain and clean the fuel tank in a well ventilated area. Have the muffler checked for contamination (carbonization) by your servicing dealer. N Dispose of fuel properly in accordance with local environmental requirements.
English Adjusting Nylon Line N Turn the machine over. N Press down the cap on the spool as far as stop. N Pull the ends of the lines out of the spool. STIHL AutoCut 1 If the spool is empty, refill with nylon line. 2 All other mowing heads Refer to the leaflet supplied with the mowing head. r nu ch S IN /L WARNING E 1 2 232BA007 KN N 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.
English Winding line onto spool S E IN r/L nu ch 2 Assembling the mowing head 3 IN r/L nu ch E Schnur/LINE 1 1 Schnur/LINE 2 2 S 4 2 3 IN /L r nu ch S 681BA022 KN 681BA023 KN 1 N Fit the empty spool in the mowing head. If the spring (4) has popped out: N N 22 push it into the spool (2) until it engages in position with an audible click. N Use green-coded nylon line with a diameter of 2 mm (0.08 in). N Cut two 2 m (6ft 6in) lengths of nylon line from the reel (special accessory).
English STIHL AutoCut 5-2 3 Removing remaining nylon line 4 3 5 1 5 681BA008 KN N N Open the mowing head – hold it steady with one hand and turn the cap (1) counterclockwise. Disengage the spool (2), take it out of the mowing head and remove the remaining line. Winding line onto spool 681BA010 KN 681BA009 KN 2 N Use green-coded nylon line with a diameter of 2.0 mm (0.08 in). N N Cut two 3 m (9ft 9in) lengths of nylon line from the reel (special accessory).
English WARNING If there are signs of serious wear, replace the complete mowing head. 2 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. 6 7 6 N 681BA011 KN WARNING Thread the ends of the lines (6) through the sleeves (7) and push the spool (2) into the head so that it snaps into position.
English Complete machine Control handle Air filter Manual fuel pump (if fitted) Pickup body (filter) in fuel tank Visual inspection (condition, leaks) X Clean Check operation X X X Replace X X Check X Replace Clean Carburetor Check idle adjustment – the cutting attachment must not rotate X X Have repaired by servicing dealer1) Fuel tank X X X X Cooling air inlet X X Readjust electrode gap X Replace after every 100 operating hours Visual inspection X Clean X All accessible scr
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. servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information. Alterations or modifications to the product not approved by STIHL.
English Main Parts 9 1 2 6 3 4 8 7 5 # 18 17 Loop handle Carrying ring Stop switch Throttle trigger lockout Throttle trigger Carburetor adjusting screws Choke lever Air filter cover Spark plug boot Machine support Manual fuel pump Fuel cap Tank Starter grip Muffler Mowing head Blade (for mowing line) Deflector Shaft Serial number 546BA015 KN 15 16 FS 40, FS 40 C, FS 50, FS 50 C 10 19 11 14 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 # 27
English All position diaphragm carburetor with integral fuel pump Engine Fuel tank capacity: Single cylinder two-stroke engine FS 40, FS 40 C Displacement: Bore: Stroke: Engine power to ISO 8893 Idle speed: Cut-off speed (rated): Max. output shaft speed (cutting attachment): 27.2 cc 34 mm 30 mm 0.7 kW (1 bhp) at 8,500 rpm 2,800 rpm 10,000 rpm 10,600 rpm 27.2 cc 34 mm 30 mm 0.8 kW (1.
English The applicable exhaust emission requirements are fulfilled by the intended usage and maintenance described in this instruction manual. The type approval expires if the engine is modified in any way. 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.
English EC Declaration of Conformity ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen Germany declares under our sole responsibility that Designation: Make: Series: Serial identification number: Displacement: Trimmer STIHL FS 40 FS 40 C FS 40 C-E FS 50 FS 50-L FS 50 C FS 50 C-E FS 50 C-E L 4144 27.
English FS 40, FS 40 C, FS 50, FS 50 C 31
English 32 FS 40, FS 40 C, FS 50, FS 50 C
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