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STIHL Fs 50 C Manual

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    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    9 Important Adjustments
    If you cannot set the correct idle speed, 
    have your STIHL dealer check your 
    power tool and make proper 
    adjustments and repairs.During Operation
    Holding and Controlling the Power Tool
    Always hold the unit firmly with both 
    hands on the handles while you are 
    working. Wrap your fingers and thumbs 
    around the handles, keeping the 
    handles cradled between your thumb 
    and forefinger. Keep your hands in this 
    position to have your power tool under 
    control at all times. Make sure your 
    trimmer handles and grips are in good 
    condition and free of moisture, pitch, oil, 
    fuel mix or grease.
    Working Conditions
    Operate and start your power tool only 
    outdoors in a well ventilated area. 
    Operate it under good visibility and 
    daylight conditions only. Work carefully. Warning!
    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 
    mechanism.
    Warning!
    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 attach-
    ment should not move. For directions on 
    how to adjust idle speed, see the appro-
    priate section of your instruction 
    manual.
    Warning!
    This unit is equipped with an ignition 
    system that is normally in operational 
    readiness. After the setting lever is used 
    to stop the engine, it automatically 
    springs back to the "on" position. If the 
    engine is warm, it may be possible to 
    start it by simply pulling the starter rope, 
    with no further adjustments. To reduce 
    the risk of injury, be particularly alert to 
    keep children away from the unit.
    Warning!
    To reduce the risk of injury from loss of 
    control, never work on a ladder or on 
    any other insecure support. Never hold 
    the cutting attachment above waist 
    height.
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    ment with your hand or any other part of 
    your body.
    Warning!
    Do not overreach. Keep proper footing 
    and balance at all times. Special care 
    must be taken in slippery conditions 
    (wet ground, snow) and in difficult, over-
    grown terrain. Watch for hidden 
    obstacles such as tree stumps, roots 
    and ditches to avoid stumbling. For bet-
    ter footing, clear away scrub and 
    cuttings. Be extremely cautious when 
    working on slopes or uneven ground. 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    10Operating Instructions
    In the event of an emergency, switch off 
    the engine immediately – move the slide 
    control / momentary stop switch to 0 or 
    STOP.To reduce the risk of eye and other injury 
    always wear proper eye protection (see 
    the chapter on "Proper Clothing") and 
    ensure that bystanders are at least 
    50 feet (15 m) away. To reduce the risk 
    of damage to property, also maintain this 
    distance from such objects as vehicles 
    or windows. Any coworkers who must be 
    in the restricted area should also wear 
    goggles or protective glasses. Stop the 
    engine immediately if you are 
    approached. Warning!
    As soon as the engine is 
    running, this product 
    generates toxic exhaust 
    fumes containing chemi-
    cals, such as unburned 
    hydrocarbons (including 
    benzene) and carbon monoxide, that 
    are known to cause respiratory prob-
    lems, cancer, birth defects, or other 
    reproductive harm. Some of the gases 
    (e.g. carbon monoxide) may be color-
    less and odorless. To reduce the risk of 
    serious or fatal injury/illness from inhal-
    ing toxic fumes, never run the machine 
    indoors or in poorly ventilated locations.
    Warning!
    If the vegetation being cut or the sur-
    rounding ground is coated with a 
    chemical substance (such as an active 
    pesticide or herbicide), read and follow 
    the instructions and warnings that 
    accompanied the substance at issue.
    Warning!
    Inhalation of certain dusts, especially 
    organic dusts such as mold or pollen, 
    can cause susceptible persons to have 
    an allergic or asthmatic reaction. Sub-
    stantial or repeated inhalation of dust 
    and other airborne contaminants, in par-
    ticular those with a smaller particle size, 
    may cause respiratory or other ill-
    nesses. Control dust at the source 
    where possible. Use good work prac-
    tices, such as operating the unit so that 
    the wind or operating process directs 
    any dust raised by the power tool away 
    from the operator. Follow the recom-
    mendations of EPA/OSHA/NIOSH and 
    occupational and trade associations 
    with respect to dust ("particulate mat-
    ter"). When the inhalation of dust cannot 
    be substantially controlled, i.e., kept at 
    or near the ambient (background) level, 
    the operator and any bystanders should 
    wear a respirator approved by 
    NIOSH/MSHA for the type of dust 
    encountered.
    Warning!
    Do not operate your power tool using 
    the starting throttle lock, as you do not 
    have control of the engine speed.Warning!
    The rotating cutting attachment may 
    fling foreign objects directly or by rico-
    chet a great distance.
    Warning!
    Before you start work, 
    examine the area for 
    stones, glass, fence wire, 
    metal, trash or other solid 
    objects. The cutting 
    attachment could throw 
    objects of this kind.
    15m (50ft) 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    11 Your muffler is furnished with a spark 
    arresting screen designed to reduce the 
    risk of fire from the emission of hot 
    particles. Never operate your unit with a 
    missing or damaged spark arresting 
    screen. If your gas/oil mix ratio is correct  Warning!
    This trimmer is normally to be used at 
    ground level with the cutting attachment 
    parallel to the ground. Use of a trimmer 
    above ground level or with the cutting 
    attachment perpendicular to the ground 
    may increase the risk of injury, since the 
    cutting attachment is more fully exposed 
    and the power tool may be more difficult 
    to control.
    Warning!
    During cutting, check the tightness and 
    the condition of the cutting attachment 
    at regular short intervals with the engine 
    and attachment stopped. If the behavior 
    of the attachment changes during use, 
    stop the engine immediately, wait until 
    the cutting attachment stops, and check 
    the nut securing the attachment for 
    tightness and the head for cracks, wear 
    and damage.
    Warning!
    A loose head may vibrate, crack, break 
    or come off the trimmer, which may 
    result in serious or fatal injury. Make 
    sure that the cutting attachment is prop-
    erly tightened. Use the wrench supplied 
    or one of sufficient length to obtain the 
    proper torque. If the head loosens after 
    being properly tightened, stop work 
    immediately. The retaining nut may be 
    worn or damaged and should be 
    replaced. If the blade or head continues 
    to loosen, see your STIHL dealer. Never 
    use a trimmer with a loose cutting 
    attachment.
    Warning!
    Replace a cracked, damaged or worn-
    out head or a cracked, bent, warped, 
    damaged, dull or worn out blade imme-
    diately, even if damage is limited to 
    superficial cracks. Such attachments 
    may shatter at high speed and cause 
    serious or fatal injury.
    Warning!
    If the head, blade or deflector becomes 
    clogged or stuck, always shut off the 
    engine and make sure the cutting 
    attachment has stopped before clean-
    ing. Grass, weeds, etc. should be 
    cleaned off the blade or from around the 
    head at regular intervals.
    Warning!
    To reduce the risk of unintentional rota-
    tion of the cutting attachment and injury, 
    always shut off the engine and remove 
    the spark plug boot before replacing the 
    cutting attachment. To reduce the risk of 
    injury, always shut off the engine before 
    adjusting the length of the nylon line on 
    manually adjustable mowing heads.
    Warning!
    The gearbox becomes hot during oper-
    ation. To reduce the risk of burn injury, 
    do not touch the gear housing when it is 
    hot.Warning!
    Never modify your muffler. Any modifi-
    cation could cause an increase in heat 
    radiation, sparks or sound level, thereby 
    increasing the risk of fire, burn injury or 
    hearing loss. You may also permanently 
    damage the engine. Have your muffler 
    serviced and repaired by your STIHL 
    servicing dealer only.
    Warning!
    The muffler and other parts of the 
    engine (e.g. fins of the cylinder, spark 
    plug) become hot during operation and 
    remain hot for a while after stopping the 
    engine. To reduce risk of burns, do not 
    touch the muffler and other parts while 
    they are hot. Keep the area around the 
    muffler clean. Remove excess lubricant 
    and all debris such as pine needles, 
    branches or leaves. Let the engine cool 
    down sitting on concrete, metal, bare 
    ground or solid wood (away from any 
    combustible substances.
    Warning!
    An improperly mounted or damaged cyl-
    inder housing or a damaged/deformed 
    muffler shell may interfere with the cool-
    ing process of the muffler. To reduce the 
    risk of fire or burn injury, do not continue 
    work with a damaged or improperly 
    mounted cylinder housing or a dam-
    aged/deformed muffler shell. 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    12 (i.e., not too rich), this screen will 
    normally stay clean as a result of the 
    heat from the muffler and need no 
    service or maintenance. If you 
    experience loss of performance and you 
    suspect a clogged screen, have your 
    muffler maintained by a STIHL servicing 
    dealer. Some state or federal laws or 
    regulations may require a properly 
    maintained spark arrestor for certain 
    uses. See the "Maintenance, Repair and 
    Storing" section of these Safety 
    Precautions. Remember that the risk of 
    a brush or forest fire is greater in hot or 
    dry conditions.
    USING THE CUTTING ATTACHMENT
    For an illustration of the various cutting 
    attachments and instructions on proper 
    mounting see the chapter on "Mounting 
    the Cutting Attachment" in your 
    instruction manual.Using the Mowing Heads
    Do not use with mowing line longer than 
    the intended length. With a properly 
    mounted deflector, the built-in line-
    limiting blade will automatically adjust 
    the line to its proper length.
    Using the unit with an overly long nylon 
    cutting line increases the load on the 
    engine and reduces its operating speed. 
    This causes the clutch to slip 
    continuously and results in overheating 
    and damage to important components 
    (e.g. clutch, polymer housing 
    components). Such damage could, 
    among other things, cause the cutting 
    attachment to rotate at idle.
    Mowing heads are to be used only on 
    trimmers equipped with a line-limiting 
    blade in the deflector in order to keep the 
    line at the proper length (see "Main 
    Parts" chapter in your instruction 
    manual).If the lawn edges are planted with trees 
    or bordered by a fence etc., it is best to 
    use a nylon line head. It achieves a 
    "softer" cut with less risk of damaging 
    tree bark etc. than polymer blades.
    However, the polymer-bladed STIHL 
    PolyCut produces a better cut if there 
    are no plants along the edge of the lawn. 
    Sharpening is not necessary, and worn 
    polymer blades are easily replaced.
    STIHL AutoCut mowing head
    Nylon cutting cord advances 
    automatically when tapped against the 
    ground (TapAction).
    STIHL PolyCut mowing head
    Uses nonrigid, pivoting polymer blades. Warning!
    S o m e  S T I H L  p o w e r  t o o l s  
    are equipped with a cata-
    lytic converter, which is 
    designed to reduce the 
    exhaust emissions of the 
    engine by a chemical 
    process in the muffler. Due to this proc-
    ess, the muffler does not cool down as 
    rapidly as conventional mufflers when 
    the engine returns to idle or is shut off. 
    To reduce the risk of fire and burn inju-
    ries when using a catalytic converter, 
    always set your power tool down in the 
    upright position and never locate it 
    where the muffler is near dry brush, 
    grass, wood chips or other combustible 
    materials while it is still hot.
          
            
              
                
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    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    13 Do not continue using the PolyCut 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.
    STIHL FixCut mowing head
    Uses pre-cut lengths of nylon line.
    Observe wear indicators.Do not continue using the mowing head 
    if the raised moldings (1) on the base 
    are missing or worn – see right 
    illustration above. The mowing head 
    may otherwise shatter and flying objects 
    could result in injury to the operator or 
    bystanders. Install a new mowing head.
    MAINTENANCE, REPAIR AND 
    STORING
    Maintenance, replacement, or repair of 
    the emission control devices and 
    systems may be performed by any 
    nonroad engine repair establishment or 
    individual. However, if you make a 
    warranty claim for a component which 
    has not been serviced or maintained 
    properly or if nonapproved replacement 
    parts were used, STIHL may deny 
    coverage.
    Strictly follow the maintenance and 
    repair instructions in the appropriate 
    sections of your instruction manual. Warning!
    If the wear limit marks are ignored, there 
    is a risk of the cutting attachment shat-
    tering 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 on one blade, always 
    replace all blades.
    1
    002BA073 KN
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    ual. Have such work performed by your 
    STIHL servicing dealer only.
    Warning!
    Use the specified spark plug, and make 
    sure it and the ignition lead are always 
    clean and in good condition. Always 
    press the spark plug boot snugly onto 
    the spark plug terminal of the proper 
    size. (Note: If the terminal has a detach-
    able SAE adapter nut, it must be 
    securely attached). A loose connection 
    between the spark plug and the ignition 
    wire connector in the boot may create 
    arcing that could ignite combustible 
    fumes and cause a fire.
    Warning!
    Never test the ignition system with the 
    spark plug boot removed from the spark 
    plug or with a removed spark plug, since 
    uncontained sparking may cause a fire. 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    14 In California, it is a violation of § 4442 or 
    § 4443 or the Public Resources Code to 
    use or operate gasoline-powered tools 
    on forest-covered, brush-covered or 
    grass-covered land unless the engine’s 
    exhaust system is equipped with a 
    complying spark arrester that is 
    maintained in effective working order. 
    The owner/operator of this product is 
    responsible for properly maintaining the 
    spark arrester. Other states or 
    governmental entities/agencies, such as 
    the U.S. Forest Service, may have 
    similar requirements. Contact your local 
    fire agency or forest service for the laws 
    or regulations relating to fire protection 
    requirements.
    Tighten all nuts, bolts and screws, 
    except the carburetor adjustment 
    screws, after each use.Do not clean your machine with a 
    pressure washer. The solid jet of water 
    may damage parts of the machine.
    Store the power tool in a dry and high or 
    locked location out of reach of children.
    Before storing for longer than a few 
    days, always empty the fuel tank. See 
    chapter "Storing the Machine" in the 
    instruction manual. Warning!
    Do not operate your power tool if the 
    muffler is damaged, missing or modi-
    fied. An improperly maintained muffler 
    will increase the risk of fire and hearing 
    loss. Your muffler is equipped with a 
    spark-arresting screen to reduce the 
    risk of fire; never operate your power 
    tool if the screen is missing, damaged or 
    clogged. Remember that the risk of a 
    brush or forest fire is greater in hot or dry 
    weather.
    Warning!
    Never repair damaged or broken heads. 
    This may cause parts of the cutting 
    attachment to come off and result in 
    serious or fatal injuries. 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    15
    Approved Combinations
    The complete combination includes:
    –Cutting attachment
    –Deflector
    –Handle
    –Shoulder strap (special accessory 
    only)
    Select correct combination from the 
    table according to the cutting 
    attachment you intend to use. Read the 
    table horizontally from left to right.
    Cutting Attachments
    Mowing heads
    1STIHL AutoCut C 5-2
    2STIHL AutoCut 5-2
    3STIHL PolyCut 6-3
    4STIHL FixCut 5-2Only mowing heads (1, 2, 3, 4) may be 
    used on trimmers with a curved drive 
    tube and loop handle.
    Deflector
    5Deflector with blade for mowing 
    heads only (see "Mounting the 
    Deflector").
    Handle
    6Loop handle
    Harness
    7Shoulder strap may be used
    Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
    Cutting Attachment Deflector Handle Harness
    546BA012 KN
    12
    67
    5
    Schnur/LINE  2Schnur/LINE  1
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    trol and contact with the cutting 
    attachment.
    Do not use rigid polymer blades, metal 
    cutting attachments or circular saw 
    blades on this unit.
    Only mowing heads may be used on 
    loop-handled trimmers with a curved 
    drive tube. 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    16 Your new power tool comes with the 
    loop handle mounted on the drive tube, 
    but it must be turned and lined up to suit 
    your requirements.
    Adjusting the loop handle
    Versions with screw (FS 40)
    NUse a screwdriver or the 
    combination wrench to loosen the 
    screw (1) on the handle.
    Versions with star knob (FS 50)
    NLoosen the star knob (2) on the 
    handle.
    All versions
    NTurn the handle to the vertical 
    position.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 6 in 
    (15 cm)
    NSlide the handle to the required 
    position.
    NTighten down the screw or star knob 
    so that the handle cannot be rotated 
    on the drive tube.
    NPush the deflector (1) over the 
    clamp (2) as far as stop.
    NInsert the nut (3) in the hex recess in 
    the deflector – make sure the holes 
    line up.
    NInsert the screw (4) with washer and 
    tighten it down firmly.
    Mounting the Loop Handle
    21
    546BA003 KN
    545BA004 KN
    546BA004 KN
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    2
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    546BA005 KN
    3 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    17
    Preparations
    NLay your trimmer on sits back with 
    the loop handle and shroud pointing 
    down and the output shaft facing up.
    Thrust Plate
    The thrust plate is shipped with the 
    PolyCut 6-3 and FixCut 5-2. It is only 
    required for these mowing heads.STIHL AutoCut 5-2 mowing head, 
    STIHL AutoCut C 5-2 mowing head
    NPull the thrust plate (1), if fitted, off 
    the shaft.
    STIHL PolyCut 6-3 mowing head, 
    STIHL FixCut 5-2 mowing head
    NSlip the thrust plate (1) over the 
    shaft (2) and engage hex recess (3) 
    on the external hexagon (4).
    Mounting the Mowing Head
    Keep the instruction sheet for the 
    mowing head in a safe place.STIHL AutoCut 5-2
    NFit the spring (1) in the mowing 
    head (2).
    NWind the mowing line  (3) on to the 
    spool (4).
    NThread the nylon line through the 
    sleeves and fit the spool in the head.
    The individual steps are described in the 
    instruction sheet supplied.
    Mounting the Cutting 
    Attachment
    546BA006 KN
    232BA033 KN
    1
    2 3
    4
    1
    232BA054 KN
    23 4
    3 
    						
    							FS 40, FS 40 C, FS 50, FS 50 C
    English
    18 NSlip the mowing head (2) over the 
    shaft (5) and engage hex recess (7) 
    on the external hexagon (6).
    NFit the cap (8) on the mowing head 
    – screw it clockwise on to the shaft 
    as far as stop and tighten it down 
    firmly.STIHL AutoCut C 5-2
    NSlip the mowing head (2) on to the 
    shaft – as AutoCut 5-2.
    NTurn the spool (9) clockwise until 
    the two arrow heads line up – 
    secure the spool in this position.
    NInsert the cap (8) in the spool, press 
    it down as far as stop and turn it 
    clockwise at the same time.
    NTurn the cap until you feel 
    resistance and then tighten it down 
    firmly by hand.STIHL PolyCut 6-3
    NFit the thrust plate on the shaft.
    NInsert the nut (10) in the mowing 
    head.
    NScrew the mowing head (11) 
    clockwise on to the shaft (5) as far 
    as stop.
    NBlock the shaft – see "Blocking the 
    Shaft".
    NTighten down the mowing head.
    Remove the locking pin.
    7
    5 2
    232BA053 KN
    68
    9
    681BA018 KN
    Schnur/LINE  2
    Schnur/LINE  128
    11
    5
    681BA019 KN
    10 
    						
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