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Stihl Km 55 R Manual

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    STIHL KM 55 R
    Read and follow all safety 
    precautions in Instruction Manual – 
    improper use can cause serious or 
    fatal injury.
    Lea y siga todas las precauciones 
    de seguridad dadas en el manual 
    de instrucciones – el uso incorrecto 
    puede causar lesiones graves o 
    Instruction Manual
    Manual de instrucciones 
    							Instruction Manual
    1 - 29
    Manual de 
    31 - 63 
    							Original Instruction Manual Printed on chlorine-free paper
    Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2011
    0458-461-8621-A. M9.A11.PM. 
    KM 55 R, KM 55 RCEnglish
    Allow only persons who fully understand 
    the manuals of the KombiEngine and the 
    KombiTool to operate this power tool 
    To receive maximum performance and 
    satisfaction from your STIHL power tool, 
    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 power tool. 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 the 
    two manuals. KombiSystem 2
    Guide to Using this Manual 2
    Safety Precautions and Working 
    Techniques 3
    Approved KombiTools 10
    Mounting the Loop Handle 11
    Fuel 12
    Fueling 13
    Starting / Stopping the Engine 13
    Operating Instructions 15
    Cleaning the Air Filter 16
    Engine Management 16
    Adjusting the Carburetor 17
    Spark Plug 18
    Engine Running Behavior 19
    Rewind Starter 20
    Storing the Machine 20
    Inspections and Maintenance by 
    Dealer 20
    Maintenance and Care 21
    Main Parts 22
    Specifications 23
    Special Accessories 24
    Maintenance and Repairs 24
    STIHL Incorporated Federal 
    Emission Control Warranty 
    Statement 25
    STIHL Incorporated California 
    Exhaust and Evaporative 
    Emissions Control Warranty 
    Statement 27
    Trademarks 29Warning!
    Because this KombiEngine is the 
    engine for a high-speed power tool, 
    some special safety precautions must 
    be observed to reduce the risk of per-
    sonal injury. Careless or improper use 
    may cause serious or even fatal injury. 
    							KM 55 R, KM 55 RC English
    2 In the STIHL KombiSystem a number of 
    different KombiEngines and KombiTools 
    can be combined to produce a power 
    tool. In this instruction manual the 
    functional unit formed by the 
    KombiEngine and KombiTools is 
    referred to as the power tool.
    Therefore, the separate instruction 
    manuals for the KombiEngine and 
    KombiTool should be used together for 
    the power tool.
    Always read and and make sure you 
    understand both instruction manuals 
    before using your power tool for the first 
    time and keep them in a safe place for 
    future reference.
    All the pictograms attached to or 
    embossed on the machine are shown 
    and explained in this manual.
    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 
    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 differ from those 
    described in this manual, please contact 
    your STIHL dealer for assistance.
    002BA442 KN
    Guide to Using this Manual
    Indicates an imminent risk of severe or 
    fatal injury.
    Indicates a hazardous situation which, if 
    not avoided, could result in severe or 
    fatal injury.
    Indicates a risk of property damage, 
    including damage to the machine or its 
    individual components. 
    							KM 55 R, KM 55 RCEnglish
    3 Have your STIHL dealer show you how 
    to operate your power tool. Observe all 
    applicable local safety regulations, 
    standards and ordinances.
    Use your power tool only for the 
    applications described in the instruction 
    manual of the KombiTool you are using.Most of these safety precautions and 
    warnings apply to the use of all STIHL 
    power tools. Different models may have 
    different parts and controls. See the 
    appropriate section of your 
    KombiEngine and KombiTool instruction 
    manuals for a description of the controls 
    and the function of the parts of your 
    Do not clean your machine with a 
    pressure washer. The solid jet of water 
    may damage parts of the machine.
    Safe use of a KombiEngine 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.
    These conditions reduce the hands 
    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 Safety Precautions and 
    Working Techniques
    Because this KombiEn-
    gine is the engine for a 
    high-speed power tool, 
    special safety precau-
    tions must be observed to 
    reduce the risk of per-
    sonal injury.
    It is important that you 
    read, fully understand 
    and observe the following 
    safety precautions and 
    warnings. Read the 
    instruction manuals and 
    the safety precautions of 
    your KombiEngine and 
    KombiTool periodically. 
    Careless or improper use 
    may cause serious or 
    fatal injury.
    Do not lend or rent your power tool with-
    out the instruction manuals. Be sure that 
    anyone using it understands the infor-
    mation contained in these manuals.
    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 bystand-
    ers 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 unauthor-
    ized persons do not use it.
    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.
    Prolonged use of a power tool (or other 
    machines) exposing the operator to 
    vibrations may produce whitefinger dis-
    ease (Raynauds phenomenon) or 
    carpal tunnel syndrome. 
    							KM 55 R, KM 55 RC English
    4 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 
    operators hands. An AV system is 
    recommended for those persons 
    using power tools on a regular or 
    sustained basis.
    –Wear gloves – not while using 
    KombiTool BG-KM – and keep your 
    hands warm.
    –Keep the AV system well 
    maintained. A power tool with loose 
    components or with damaged or 
    worn AV elements 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.
    Proper Clothing
    Be particularly alert and cautious when 
    wearing hearing protection because 
    your ability to hear warnings (shouts, 
    alarms, etc.) is restricted.
    For further instructions on proper 
    clothing see the safety precautions in 
    the instruction manual of the KombiTool 
    you are using.
    For illustrations and definitions of the 
    power tool parts see the chapter on 
    Main Parts and Controls.
    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 Warning!
    The ignition system of the STIHL unit 
    produces an electromagnetic field of a 
    very low intensity. This field may inter-
    fere with some pacemakers. To reduce 
    the risk of serious or fatal injury, persons 
    with a pacemaker should consult their 
    physician and the pacemaker manufac-
    turer before operating this tool.
    To reduce the risk of injury, the operator 
    should wear proper protective apparel.
    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 regularly.
    Never modify this power tool in any way. 
    Only attachments supplied by STIHL or 
    expressly approved by STIHL for use 
    with the specific STIHL KombiEngine 
    model are authorized. Although certain 
    unauthorized attachments are useable 
    with STIHL power tools, their use may, 
    in fact, be extremely dangerous.
    Always switch off the engine and make 
    sure the working tool has stopped 
    before putting a power tool down. When 
    transporting your power tool in a vehi-
    cle, properly secure it to prevent 
    turnover, fuel spillage and damage to 
    the power tool. 
    							KM 55 R, KM 55 RCEnglish
    5 Fuel
    Your STIHL power tool uses an oil- 
    gasoline mixture for fuel (see the 
    chapter on Fuel of your instruction 
    Fueling Instructions
    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.
    Toolless cap with gripTo 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  Warning!
    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 
    combustible fuel vapor may escape 
    from the fuel system.
    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 refu-
    eling. Gasoline vapor pressure may 
    build up inside the fuel tank depending 
    on the fuel used, the weather conditions 
    and the tank venting system.
    Check for fuel leakage 
    while refueling and dur-
    ing 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 cloth-
    ing. If this happens, change your 
    clothing immediately.
    In order to reduce the risk of fuel spill-
    age and fire from an improperly 
    tightened fuel cap, correctly position 
    and tighten the fuel cap in the fuel tank 
    Fold the grip flush with 
    the top of the cap. Grip 
    the cap and check for 
    tightness. If the grip does 
    not lie completely flush 
    with the cap and the 
    detent on the grip does 
    not fit in the correspond-
    ing recess in the filler 
    opening, or if the cap is 
    loose in the filler opening, 
    the cap is not properly 
    seated and tightened and 
    you must repeat the 
    above steps.
    001BA220 KN 
    							KM 55 R, KM 55 RC English
    6can result from handling, cleaning 
    or an improper attempt at 
    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 StartingKeep 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.
    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 
    KombiEngine and KombiTool manuals. 
    Place the power tool on firm ground or 
    other solid surface in an open area. 
    Maintain good balance and secure 
    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. Left: Base of cap in closed posi-
    tion (with open space)
    Right: Base of cap correctly posi-
    tioned for installation
    001BA227 KN
    001BA226 KN
    Unit vibrations can cause 
    an improperly tightened 
    fuel filler cap to loosen or 
    come off and spill quanti-
    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.
    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 operate your power tool if it is 
    damaged, improperly adjusted or main-
    tained, or not completely or securely 
    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 
    To reduce the risk of injury from loss of 
    control, be absolutely sure that the 
    working tool 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 working tool. 
    							KM 55 R, KM 55 RCEnglish
    7 See also the safety precautions on 
    Starting in the instruction manual of the 
    Important AdjustmentsIf 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.
    Your right hand should grip the rear 
    handle. This also applies to left-handers.
    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 working tool, do not use a 
    power tool with incorrect idle adjust-
    ment. At correct idle speed, the working 
    tool should not move. For directions on 
    how to adjust idle speed, see the appro-
    priate section of your instruction 
    To reduce the risk of injury from loss of 
    control, never work on a ladder or on 
    any other insecure support.
    002BA057 KN
    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. 
    							KM 55 R, KM 55 RC English
    8 Operating Instructions
    In the event of an emergency, switch off 
    the engine immediately – move the slide 
    control / stop switch to 0 or STOP.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  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 
    Do not operate your power tool using 
    the starting throttle lock, as you do not 
    have control of the engine speed.
    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.
    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.
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