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STIHL Fs 40 C Owners Manual

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    STIHL FS 40, 50
    Read Instruction Manual thoroughly 
    before use and follow all safety 
    precautions – improper use can 
    cause serious or fatal injury.
    Antes de usar la máquina lea y siga 
    todas las precauciones de 
    seguridad dadas en el manual de 
    instrucciones – el uso incorrecto 
    puede causar lesiones graves o 
    							Instruction Manual
    1 - 43
    Manual de instrucciones
    44 - 91 
    							Original Instruction Manual Printed on chlorine-free paper
    Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2017
    0458-546-8621-D. VA3.A17. 
    FS 40, FS 40 C, FS 50, FS 50 C
    {This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process 
    with electronic systems.
    Allow only persons who fully understand 
    this manual to operate your trimmer.
    To receive maximum performance and 
    satisfaction from your STIHL trimmer, it 
    is important that you read, understand 
    and follow the safety precautions and 
    the operating and maintenance 
    instructions in chapter "Safety 
    Precautions and Working Techniques" 
    before using your trimmer. For further 
    information you can go to 
    Contact your STIHL dealer or the STIHL 
    distributor for your area if you do not 
    understand any of the instructions in this 
    Because a trimmer is a high-speed 
    cutting tool some special safety 
    precautions must be observed to reduce 
    the risk of personal injury. Careless or 
    improper use may cause serious or even 
    fatal injury.
    Make sure your unit is equipped with the 
    proper deflector, handle and harness for 
    the type of cutting attachment being 
    used. Always wear proper eye 
    protection. Guide to Using this Manual 2
    Safety Precautions and Working 
    Techniques 3
    Approved Combinations of Cutting 
    Attachment, Deflector, Handle and 
    Harness 14
    Mounting the Loop Handle 15
    Mounting the Deflector 15
    Mounting the Cutting Attachment 16
    Fuel 19
    Fueling 20
    Starting / Stopping the Engine 22
    Operating Instructions 24
    Cleaning the Air Filter 25
    Engine Management 25
    Adjusting the Carburetor 26
    Spark Plug 26
    Engine Running Behavior 27
    Storing the Machine 27
    Maintaining the Mowing Head 28
    Inspections and Maintenance by 
    Dealer 32
    Maintenance and Care 33
    Main Parts 35
    Specifications 36
    Maintenance and Repairs 37
    Disposal 38
    Limited Warranty 38
    STIHL Incorporated Federal 
    Emission Control Warranty 
    Statement 38STIHL Incorporated California 
    Exhaust and Evaporative 
    Emissions Control Warranty 
    Statement 40
    Trademarks 42 
    							FS 40, FS 40 C, FS 50, FS 50 C
    The meanings of the pictograms 
    attached to or embossed on the 
    machine are explained in this manual.
    Depending on the model concerned, the 
    following pictograms may be on your 
    Symbols in Text
    Many operating and safety instructions 
    are supported by illustrations.
    The individual steps or procedures 
    described in the manual may be marked 
    in different ways:
    NA bullet marks a step or procedure.
    A description of a step or procedure that 
    refers directly to an illustration may 
    contain item numbers that appear in the 
    illustration. Example:
    NLoosen the screw (1).
    NLever (2) ...
    In addition to the operating instructions, 
    this manual may contain paragraphs 
    that require your special attention. Such 
    paragraphs are marked with the 
    symbols and signal words described 
    Indicates a hazardous situation that, if 
    not avoided, will result in death or 
    serious injury.
    Indicates a hazardous situation that, if 
    not avoided, could result in death or 
    serious injury.
    Indicates a risk of property damage, 
    including damage to the machine or its 
    individual components.
    Engineering Improvements
    STIHL’s philosophy is to continually 
    improve all of its products. As a result, 
    engineering changes and improvements 
    are made from time to time. Therefore, 
    some changes, modifications and 
    improvements may not be covered in 
    this manual. If the operating 
    characteristics or the appearance of 
    your machine differs from those 
    described in this manual, please contact 
    your STIHL dealer or the STIHL 
    distributor for your area for assistance.Guide to Using this Manual
    Fuel tank for gasoline 
    and engine oil mixture
    Press to operate decom-
    pression valve
    Manual fuel pump
    Press to operate manual 
    fuel pump
    Filler hole for gear 
    Air intake summer mode
    Air intake winter mode
    Handle heating 
    							FS 40, FS 40 C, FS 50, FS 50 C
    3 The terminology utilized in this manual 
    when referring to the power tool reflects 
    the type of cutting attachments that may 
    be mounted on it. The term "trimmer" is 
    used to designate an FS unit that is 
    equipped with a nylon line head or a 
    head with flexible plastic blades (i.e., the 
    PolyCut head).
    As more fully explained later in these 
    Safety Precautions, to reduce the risk of 
    personal injury, make sure your unit is 
    equipped with the proper handle, 
    harness and deflector for the type of 
    cutting attachment you are using. Use 
    only cutting attachments that are 
    specifically authorized by STIHL for use 
    on your FS model. To reduce the risk of 
    severe or fatal injury from blade contact 
    and / or loss of control, never attempt to 
    use a metal blade on this trimmer.Have your STIHL dealer show you how 
    to operate your power tool. Observe all 
    applicable local safety regulations, 
    standards and ordinances.
    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 this machine may be 
    hazardous. If the rotating line or blade 
    comes in contact with your body, it will 
    cut you. When it comes in contact with 
    solid foreign objects such as rocks or 
    bits of metal, it may fling them directly or 
    by ricochet in the direction of bystanders 
    or the operator. Striking such objects 
    could damage the cutting attachment. 
    Thrown objects, including broken heads 
    or blades, may result in serious or fatal 
    injury to the operator or bystanders.
    Use your trimmer equipped with the 
    appropriate cutting attachment only for 
    cutting grass and similar material.
    Do not use it for other purposes, since 
    misuse may result in personal injury or 
    property damage, including damage to 
    the machine.
    Minors should never be allowed to use 
    this power tool. Bystanders, especially 
    children, and animals should not be 
    allowed in the area where it is in use.
    To reduce the risk of injury to bystanders 
    and damage to property, never let your 
    power tool run unattended. When it is 
    not in use (e.g. during a work break), 
    shut it off and make sure that 
    unauthorized persons do not use it.
    Most of these safety precautions and 
    warnings apply to the use of all STIHL 
    trimmers. Different models may have 
    different parts and controls. See the 
    appropriate section of your instruction 
    manual for a description of the controls 
    and the function of the parts of your 
    Safe use of a trimmer involves
    1.the operator
    2.the power tool
    3.the use of the power tool.
    Physical Condition
    You must be in good physical condition 
    and mental health and not under the 
    influence of any substance (drugs, 
    alcohol, etc.) which might impair vision, 
    dexterity or judgment. Do not operate 
    this machine when you are fatigued.
    Be alert – if you get tired, take a break. 
    Tiredness may result in loss of control. 
    Working with any power tool can be 
    strenuous. If you have any condition that 
    might be aggravated by strenuous work, 
    check with your doctor before operating 
    this machine.
    Safety Precautions and 
    Working Techniques
    Because a trimmer is a 
    high-speed, fast-cutting 
    power tool, special safety 
    precautions must be 
    observed to reduce the 
    risk of personal injury.
    It is important that you 
    read, fully understand 
    and observe the following 
    safety precautions and 
    warnings. Read the 
    instruction manual and 
    the safety precautions 
    periodically. Careless or 
    improper use may cause 
    serious or fatal injury. 
    							FS 40, FS 40 C, FS 50, FS 50 C
    Prolonged use of a power tool (or other 
    machines) exposing the operator to 
    vibrations may produce whitefinger 
    disease (Raynaud's phenomenon) or 
    carpal tunnel syndrome.
    These conditions reduce the hand's 
    ability to feel and regulate temperature, 
    produce numbness and burning 
    sensations and may cause nerve and 
    circulation damage and tissue necrosis.
    All factors which contribute to 
    whitefinger disease are not known, but 
    cold weather, smoking and diseases or 
    physical conditions that affect blood 
    vessels and blood transport, as well as 
    high vibration levels and long periods of 
    exposure to vibration are mentioned as 
    factors in the development of whitefinger 
    disease. In order to reduce the risk of 
    whitefinger disease and carpal tunnel 
    syndrome, please note the following:
    –Most STIHL power tools are 
    available with an anti-vibration 
    ("AV") system designed to reduce 
    the transmission of vibrations 
    created by the machine to the 
    operator's hands. An AV system is 
    recommended for those persons 
    using power tools on a regular or 
    sustained basis.
    –Wear gloves and keep your hands 
    warm.–Keep the AV system well 
    maintained. A power tool with loose 
    components or with damaged or 
    worn AV buffers will tend to have 
    higher vibration levels.
    –Maintain a firm grip at all times, but 
    do not squeeze the handles with 
    constant, excessive pressure. Take 
    frequent breaks.
    All the above-mentioned precautions do 
    not guarantee that you will not sustain 
    whitefinger disease or carpal tunnel 
    syndrome. Therefore, continual and 
    regular users should closely monitor the 
    condition of their hands and fingers. If 
    any of the above symptoms appear, 
    seek medical advice immediately.
    The ignition system of the STIHL unit 
    produces an electromagnetic field of a 
    very low intensity. This field may 
    interfere with some pacemakers. To 
    reduce the risk of serious or fatal injury, 
    persons with a pacemaker should 
    consult their physician and the 
    pacemaker manufacturer before 
    operating this tool.
    Proper Clothing
    To reduce the risk of injury, the operator 
    should wear proper protective apparel.
    The deflector provided with your power 
    tool will not protect the operator from all 
    foreign objects (gravel, glass, wire, etc.) thrown back by the rotating cutting 
    attachment. Thrown objects may also 
    ricochet and strike the operator.
    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 
    injury to your eyes never 
    operate your power tool 
    unless wearing goggles 
    or properly fitted protec-
    tive glasses with 
    adequate top and side 
    protection complying with 
    ANSI Z87 "+" (or your 
    applicable national stand-
    ard). To reduce the risk of 
    injury to your face STIHL 
    recommends that you 
    also wear a face shield or 
    face screen over your 
    goggles or protective 
    Power tool noise may 
    damage your hearing. 
    Wear sound barriers (ear 
    plugs or ear mufflers) to 
    protect your hearing. 
    Continual and regular 
    users should have their 
    hearing checked 
    							FS 40, FS 40 C, FS 50, FS 50 C
    5 Avoid loose-fitting jackets, scarfs, 
    neckties, jewelry, flared or cuffed pants, 
    unconfined long hair or anything that 
    could become caught on branches, 
    brush or the moving parts of the unit. 
    Secure hair so it is above shoulder level.
    For illustrations and definitions of the 
    power tool parts see the chapter on 
    "Main Parts."
    Never modify this power tool in any way. 
    Only attachments supplied by STIHL 
    and expressly approved by STIHL for use with the specific STIHL model are 
    authorized. Although certain 
    unauthorized attachments are useable 
    with STIHL power tools, their use may, 
    in fact, be extremely dangerous. For the 
    cutting attachments authorized by 
    STIHL for your unit, see the chapter 
    "Approved Combinations of Cutting 
    Attachment, Deflector, Handle and 
    Harness" in the instruction manual or the 
    STIHL "Cutting Attachments, Parts & 
    Accessories" catalog.
    If this 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. Check in particular that 
    the fuel system is tight (no leaks) and 
    that the controls and safety devices are 
    working properly. Do not continue 
    operating this machine if it is damaged. 
    In case of doubt, have it checked by your 
    STIHL servicing dealer.
    Transporting the Power Tool
    To reduce the risk of injury from loss of 
    control and blade or line contact, never 
    carry or transport your power tool with 
    the cutting attachment moving.It may be carried only in a horizontal 
    position. Grip the shaft in a manner that 
    the machine is balanced horizontally. 
    Keep the hot muffler away from your 
    body and the cutting attachment behind 
    Always shut off the engine and make 
    sure the cutting attachment has stopped 
    before putting a trimmer down. When 
    transporting it in a vehicle, properly 
    secure it to prevent turnover, fuel 
    spillage and damage to the unit.
    Your STIHL power tool uses an oil- 
    gasoline mixture for fuel (see the 
    chapter on "Fuel" of your instruction 
    manual). Always wear heavy duty 
    work gloves (e.g. made of 
    leather or other wear 
    resistant material) when 
    handling the machine, 
    blade and the cutting 
    attachment. Heavy-duty, 
    nonslip gloves improve 
    your grip and help to pro-
    tect your hands.
    Clothing must be sturdy 
    and snug-fitting, but allow 
    complete freedom of 
    movement. Wear long 
    pants made of heavy 
    material to help protect 
    your legs. Do not wear 
    shorts, sandals or go 
    Good footing is very 
    important. Wear sturdy 
    boots with nonslip soles. 
    Steel-toed safety boots 
    are recommended.
    389BA019 KN 
    							FS 40, FS 40 C, FS 50, FS 50 C
    Fueling Instructions
    To reduce the risk of serious injury from 
    burns, never attempt to refuel the unit 
    until it has been completely removed 
    from the operator.
    Fuel your power tool in well-ventilated 
    areas, outdoors. Always shut off the 
    engine and allow it to cool before 
    refueling. Gasoline vapor pressure may 
    build up inside the fuel tank depending 
    on the fuel used, the weather conditions 
    and the tank venting system.
    In order to reduce the risk of burns and 
    other personal injury from escaping gas 
    vapor and fumes, remove the fuel filler 
    cap on your power tool carefully so as to 
    allow any pressure build-up in the tank 
    to release slowly. Never remove the fuel 
    filler cap while the engine is running.Select bare ground for fueling and move 
    at least 10 feet (3 m) from the fueling 
    spot before starting the engine. Wipe off 
    any spilled fuel before starting your 
    Different models may be equipped with 
    different fuel caps.
    In order to reduce the risk of fuel spillage 
    and fire from an improperly tightened 
    fuel cap, correctly position and tighten 
    the fuel cap in the fuel tank opening.
    Toolless cap with grip
    To do this with this STIHL cap, raise the 
    grip on the top of the cap until it is upright 
    at a 90° angle. Insert the cap in the fuel tank opening with the raised positioning 
    marks on the grip of the cap and on the 
    fuel tank opening lining up. Using the 
    grip, press the cap down firmly while 
    turning it clockwise as far as it will go 
    (approx. 1/4 turn).
    Misaligned, damaged or broken cap
    NIf the cap does not drop fully into the 
    opening when the positioning marks 
    line up and/or if the cap does not 
    tighten properly when twisted, the 
    base of the cap may be prematurely 
    rotated (in relation to the top) to the 
    closed position. Such misalignment 
    can result from handling, cleaning 
    or an improper attempt at 
    tightening. Gasoline is an extremely 
    flammable fuel. If spilled 
    and ignited by a spark or 
    other ignition source, it 
    can cause fire and seri-
    ous burn injury or 
    property damage. Use 
    extreme caution when 
    handling gasoline or fuel 
    mix. Do not smoke or 
    bring any fire or flame 
    near the fuel or the power 
    tool. Note that combus-
    tible fuel vapor may 
    escape from the fuel 
    Check for fuel leakage 
    while refueling and during 
    operation. If fuel leakage 
    is found, do not start or 
    run the engine until the 
    leak is fixed and any 
    spilled fuel has been 
    wiped away. Take care 
    not to get fuel on your 
    clothing. If this happens, 
    change your clothing 
    001BA220 KN
    pletely flush with the cap 
    and the detent on the grip 
    does not fit in the corre-
    sponding recess in the 
    filler opening, or if the cap 
    is loose in the filler open-
    ing, the cap is not 
    properly seated and tight-
    ened and you must 
    repeat the above steps. 
    							FS 40, FS 40 C, FS 50, FS 50 C
    7 NTo return the cap to the open 
    position for installation, turn the cap 
    (with the grip up) until it drops fully 
    into the tank opening. Next, twist the 
    cap counterclockwise as far as it will 
    go (approx. 1/4 turn) – this will twist 
    the base of the cap into the correct 
    position. Then, twist the cap 
    clockwise, closing it normally.
    NIf your cap still does not tighten 
    properly, it may be damaged or 
    broken; immediately stop use of the 
    unit and take it to your authorized 
    STIHL dealer for repair.Screw Cap
    See also the "Fueling" chapter in your 
    Instruction Manual for additional 
    Before Starting
    Always check your power tool for proper 
    condition and operation before starting, 
    particularly the throttle trigger, throttle 
    trigger lockout, stop switch, cutting 
    attachment, deflector and harness. The 
    throttle trigger must move freely and 
    always spring back to the idle position. 
    Never attempt to modify the controls or 
    safety devices. Never use a power tool 
    that is damaged or not properly 
    Check fuel system for leaks, especially 
    the visible parts, e.g., filler cap, hose 
    connections, manual fuel pump (only for 
    power tools equipped with a manual fuel 
    pump). Do not start the engine if there 
    are leaks or damage – risk of fire! Have 
    the machine repaired by a servicing 
    dealer before using it.
    Do not attach any cutting attachment to 
    a unit without proper installation of all 
    required parts. Failure to use the proper 
    parts may cause the blade or head to fly 
    off and seriously injure the operator or 
    The cutting attachment must be properly 
    tightened and in safe operating 
    condition. Inspect for loose parts (nuts, 
    screws, etc.) Replace damaged heads 
    before using the power tool.
    Keep the handles clean and dry at all 
    times; it is particularly important to keep 
    them free of moisture, pitch, oil, fuel mix, 
    grease or resin in order for you to 
    maintain a firm grip and properly control 
    your power tool.
    Check that the spark plug boot is 
    securely mounted on the spark plug – a 
    loose boot may cause arcing that could 
    ignite combustible fumes and cause a 
    fire. Left: Base of cap in closed posi-
    tion (with open space)
    Right: Base of cap correctly posi-
    tioned for installation
    001BA227 KN
    001BA226 KN
    ties of fuel. In order to 
    reduce the risk of fuel 
    spillage and fire, tighten 
    the fuel filler cap by hand 
    as securely as possible. 
    							FS 40, FS 40 C, FS 50, FS 50 C
    Keep the deflector (and the attached 
    skirt where appropriate) adjusted 
    properly at all times (see chapters on 
    "Mounting the Deflector" and "Mounting 
    the Cutting Attachment" of your 
    instruction manual).
    Arrows on the deflector (as seen from 
    the underside of the deflector) show the 
    correct direction of rotation of the cutting 
    attachment (counterclockwise). When viewed from above, however, the cutting 
    attachment rotates clockwise (see arrow 
    embossed on top of deflector).
    Adjust the hand grip and harness (if you 
    are wearing one) to suit your size before 
    starting work. The machine should be 
    properly balanced as specified in your 
    instruction manual for proper control and 
    less fatigue in operation. To be better 
    prepared in case of an emergency, 
    practise releasing the unit from the 
    harness as quickly as possible.
    Start the engine at least 10 feet (3 m) 
    from the fueling spot, outdoors only.
    For specific starting instructions, see the 
    appropriate section of your manual. 
    Place the power tool on firm ground or 
    other solid surface in an open area. 
    Maintain good balance and secure 
    To reduce the risk of injury from blade or 
    line contact, be absolutely sure that the 
    cutting attachment is clear of you and all 
    other obstructions and objects, including 
    the ground, because when the engine 
    starts at starting-throttle, engine speed 
    will be fast enough for the clutch to 
    engage and move the cutting 
    Once the engine has started, 
    immediately blip the throttle trigger, 
    which should release the starting throttle 
    and allow the engine to slow down to 
    idle.With the engine running only at idle, 
    attach the power tool to the spring hook 
    of your harness (see appropriate 
    chapter of this manual).
    Your power tool is a one-person 
    machine. Do not allow other persons in 
    the general work area, even when 
    To reduce the risk of injury from loss of 
    control, do not attempt to "drop start" 
    your power tool.
    When you pull the starter grip, do not 
    wrap the starter rope around your hand. 
    Do not let the grip snap back, but guide 
    the starter rope to rewind it properly. 
    Failure to follow this procedure may 
    result in injury to your hand or fingers 
    and may damage the starter 
    Important Adjustments
    To reduce the risk of personal injury 
    from loss of control or contact with the 
    running cutting attachment, do not use 
    your unit with incorrect idle adjustment. 
    At correct idle speed, the cutting 
    attachment should not move. For 
    directions on how to adjust idle speed, 
    see the appropriate section of your 
    instruction manual. To reduce the risk 
    of personal injury 
    to the operator 
    from blade or line 
    contact and 
    thrown objects, 
    make sure your 
    unit is equipped 
    with the proper 
    deflector, handle 
    and harness for 
    the type of cutting 
    attachment being 
    used (see chart in 
    the chapter on 
    "Approved Combi-
    nations of Cutting 
    Deflector, Handle 
    and Harness"). 
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