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Stihl Fs 55 R Instruction Manual

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    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    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 
    Always hold the unit firmly with both 
    hands on the handles while you are 
    working. Wrap your fingers and thumbs 
    around the handles.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!
    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 
    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 
    Never attempt to operate 
    your power tool with one 
    hand. Loss of control of 
    the power tool resulting in 
    serious or fatal injury may 
    result. To reduce the risk 
    of cut injuries, keep hands and feet 
    away from the cutting attachment. 
    Never touch a moving cutting attach-
    ment with your hand or any other part of 
    your body.
    002BA055 KN
    002BA054 KN
    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.
    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 
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    10Operating Instructions
    In the event of an emergency, shut off 
    the engine immediately – move the slide 
    control / 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 gen-
    erates 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.
    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.
    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 associa-
    tions with respect to dust (particulate 
    matter). When the inhalation of dust 
    cannot be substantially controlled, i.e., 
    kept at or near the ambient (back-
    ground) level, the operator and any 
    bystanders should wear a respirator 
    approved by NIOSH / MSHA for the type 
    of dust encountered.
    Do not operate your power tool using 
    the starting throttle lock, as you do not 
    have control of the engine speed.Warning!
    The cutting attachment 
    continues to rotate for a 
    short period after the 
    throttle trigger is released 
    (flywheel effect).
    The rotating cutting attachment may 
    fling foreign objects directly or by rico-
    chet a great distance.
    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 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    11 Warning!
    This trimmer / brushcutter is normally to 
    be used at ground level with the cutting 
    attachment parallel to the ground. Use 
    of a trimmer / brushcutter above ground 
    level or with the cutting attachment per-
    pendicular 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 
    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 blade or head for 
    cracks, wear and damage.
    A loose blade or head may vibrate, 
    crack, break or come off the trimmer / 
    brushcutter, which may result in serious 
    or fatal injury. Make sure that the cutting 
    attachment is properly tightened. Use 
    the wrench supplied or one of sufficient 
    length to obtain the proper torque. If the 
    blade or head loosens after being prop-
    erly tightened, stop work immediately. 
    The retaining nut may be worn or dam-
    aged and should be replaced. If the 
    blade or head continues to loosen, see 
    your STIHL dealer. Never use a trimmer 
    / brushcutter with a loose cutting 
    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.
    When using rigid blades, avoid cutting 
    close to fences, sides of buildings, tree 
    trunks, stones or other such objects that 
    could cause the power tool to kick out or 
    could cause damage to the blade. 
    STIHL recommends use of the nylon 
    line heads for such jobs. In addition, be 
    alert to an increased possibility of rico-
    chets in such situations.
    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.
    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 
    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.
    To reduce the risk of fire and burn injury, 
    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 
    Never modify your muffler. The muffler 
    could be damaged and cause an 
    increase in heat radiation or sparks, 
    thereby increasing the risk of fire and 
    burn injury. You may also permanently 
    damage the engine. Have your muffler 
    serviced and repaired by your STIHL 
    servicing dealer only. 
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    12 Catalytic Converter
    Your catalytic converter is furnished with 
    screens designed to reduce the risk of 
    fire from the emission of hot particles. 
    Due to the heat from the catalytic 
    reaction, these screens will normally stay clean 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.
    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 
    trimmer / brushcutters 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. Warning!
    Some STIHL power tools 
    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, the following specific safety 
    precautions must be observed.
    Since a muffler with a catalytic converter 
    cools down less rapidly than conven-
    tional mufflers, 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.
    An improperly mounted or damaged cyl-
    inder housing or a damaged / deformed 
    muffler shell may interfere with the cool-
    ing process of the catalytic converter. 
    To reduce the risk of fire or burn injury, 
    do not continue work with a damaged or 
    improperly mounted cylinder housing or 
    a damaged / deformed muffler shell.      
    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 an FS model for which it is not 
    000BA015 KN 
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    13 STIHL SuperCut mowing head
    Fresh line is advanced automatically. 
    Frayed line is replaced by a simple 
    adjustment (see instruction sheet 
    supplied with mowing head).
    STIHL AutoCut mowing head
    Nylon cutting line advances 
    automatically when tapped against the 
    ground (TapAction).
    STIHL TrimCut mowing head 
    Frayed line is replaced by a simple 
    adjustment (see instruction sheet 
    supplied with mowing head).
    STIHL PolyCut mowing head
    Uses either nylon lines or nonrigid, 
    pivoting polymer blades.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.
    Risk of Kickout (Blade Thrust) with 
    All Rigid Cutting Blades
    This kickout (blade thrust) may cause 
    loss of control of the power tool and may 
    result in serious or fatal injury to the 
    operator or bystanders. To reduce the 
    risk of injury, extreme caution should be 
    used when cutting with the shaded area 
    of any rigid blade. Warning!
    To reduce the risk of serious injury, 
    never use wire or metal-reinforced line 
    or other material in place of the nylon 
    cutting lines. Pieces of wire could break 
    off and be thrown at high speed toward 
    the operator or bystanders.
    002BA177 KN
    Three rectangular wear limit marks are 
    applied to the base (periphery) of the 
    PolyCut. To reduce the risk of serious 
    injury from breakage of the head or 
    blades, the PolyCut must not be used 
    when it has worn as far as one of these 
    marks. It is important to follow the main-
    tenance instructions supplied with the 
    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.
    Kickout (blade thrust) is the sudden and 
    uncontrolled motion towards the opera-
    tors right or rear that can occur when 
    the shaded area (especially the darkly 
    shaded area) of a rotating blade comes 
    in contact with a solid rigid object like a 
    tree, rock, bush or wall. The rapid coun-
    terclockwise rotation of the blade may 
    be stopped or slowed, and the cutting 
    attachment may be thrown to the right or 
    to the rear.
    002BA135 KN 
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    14 Using the Grass Cutting Blade
    All kinds of grass and weeds can be 
    easily cut with the grass cutting blade. 
    The power tool is swept in an arc similar 
    to a scythe.
    The 4-tooth grass cutting blade is 
    intended to cut grass and weeds. It has 
    4 cutting knives with cutting edges on 
    both sides, i.e. front and rear. When the 
    cutting edges on one side become dull, 
    the blade can be turned over to utilize 
    the cutting edges on the other side.
    The 8-tooth grass cutting blade is 
    recommended for cutting fern or reed.Both types of grass cutting blade have to 
    be resharpened when all cutting edges 
    are dull.
    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.
    Wear gloves when handling or 
    performing maintenance on blades. Warning!
    To reduce the risk of serious or fatal 
    injury from blade breakage, never 
    attempt to use this blade to cut woody 
    000BA020 KNWarning!
    Use only identical STIHL replacement 
    parts for maintenance and repair. Use of 
    non-STIHL parts may cause serious or 
    fatal injury.
    Always stop the engine and make sure 
    that the cutting attachment is stopped 
    before doing any maintenance or repair 
    work or cleaning the power tool. Do not 
    attempt any maintenance or repair work 
    not described in your instruction man-
    ual. Have such work performed by your 
    STIHL servicing dealer only.
    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.
    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.
    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. If your muffler was equipped with a 
    spark-arresting screen to reduce the 
    risk of fire, never operate your power 
    tool if the screen is missing or damaged. 
    Remember that the risk of forest fires is 
    greater in hot or dry weather.
    Never repair damaged cutting attach-
    ments by welding, straightening or 
    modifying the shape. This may cause 
    parts of the cutting attachment to come 
    off and result in serious or fatal injuries. 
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    15 Keep blades sharp. 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. 
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    Approved Combinations
    Select correct combination from the 
    table according to the cutting 
    attachment you intend to use.Cutting attachments
    Mowing heads
    1STIHL SuperCut 20-2
    2STIHL AutoCut C 25--2
    3STIHL AutoCut 25-2
    4STIHL TrimCut 31-2
    5STIHL FixCut 25-2
    Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
    Cutting attachment Deflector Handle Harness
    681BA128 KN
    For safety reasons only the 
    cutting attachments, deflectors, 
    handles and shoulder straps 
    shown in each row of the table 
    may be used together. No other 
    combinations are permitted 
    because of the risk of accidents. 
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    17 6STIHL PolyCut 20-3
    Metal mowing attachments
    7Grass cutting blade 230-4
    8Grass cutting blade 230-8
    9Deflectoronly for mowing heads
    10Deflector with
    11Skirt and blade for all mowing heads 
    12Deflector without skirt and blade for 
    all metal mowing attachments
    13Loop handle
    14Loop handlewith
    15Barrier bar
    16Bike handle
    17Shoulder strap may be used
    18Shoulder strap must be used
    19Full harness may be used
    Among other parts, the complete unit in 
    –Cutting attachment
    –Harness (only with bike handle)
    Mounting the handlebar
    NPlace the clamp (1) and handle 
    support (2) against the drive 
    tube (3).
    NFit the handlebar (4) in the handle 
    support – the rubber handle (5) 
    must be on the left (viewed from the 
    NPlace the clamp (6) on the handle 
    NInsert the screws (7) through the 
    holes in the parts and screw them 
    into the clamp (6) as far as stop.
    Non-metal grass cutting blades 
    are not approved.Warning!
    Based on the cutting attachment being 
    Choose the proper deflector in order to 
    reduce the risk of injury from thrown 
    objects and contact with the cutting 
    Make sure your unit is equipped with the 
    proper handle and harness in order to 
    reduce the risk of injury from loss of con-
    trol and contact with the cutting 
    attachment: use grass cutting metal 
    blades on this unit only if equipped with 
    a bike handle or a loop handle with bar-
    rier bar.
    Do not use rigid plastic blades, brush 
    knifes or circular saw blades on this unit.
    Mounting the Bike Handle
    13 25
    233BA025 KN 
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    18 NMount the handlebar (4) on the 
    drive tube (3) about  6 in (15 cm) (A) 
    forward of the engine housing.
    NLine up the handlebar and tighten 
    down the screws firmly.
    Mounting the control handle
    NUse the combination wrench or 
    screwdriver to take out the screw (8) 
    – the nut (9) remains in the control 
    handle (10).
    NPush the control handle onto the 
    handlebar (4) until the holes (12) 
    line up – the throttle trigger (11) 
    must point towards the gearbox.
    NInsert the screw (8) and tighten it 
    down firmly.
    Fitting the throttle cableNPush the throttle cable (13) into the 
    retainer (14).
    233BA018 KN
    Do not kink the throttle cable or 
    lay it in tight radii – make sure the 
    throttle trigger moves freely.
    002BA357 KN
    1314 13
    233BA027 KN 
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