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Stihl 85 Manual

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    Instruction Manual    
    Manual de instrucciones
    STIHL FS 80, 85
    BA_FS80_30_U_K4.book  Seite 0  Freitag, 8. Oktober 2004  10:59 10
    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 mortales. 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Printed on chlorine-free paper.
    Printing inks contain vegetabl e oils; paper can be recycled.
    © ANDREAS STIHL AG & Co. KG, 2008
    0458 393 8621. M10. D8 . CP. Printed in USA 
    Guide to Using this Manual  ..............  2
    Safety Precautions and 
    Working Techniques  .........................  3
    Approved Combinations of 
    Cutting Tool, Deflector, 
    Handle and Harness  .......................  20
    Approved Power 
    Tool Attachments  ............................  22
    Mounting the Bike Handle  ..............  22
    Adjusting the Throttle Cable  ...........  24
    Mounting the Loop Handle  .............  24
    Fitting the Carrying Eye  ..................  26
    Mounting the Deflector  ...................  26
    Mounting the Cutting Tools  .............  27
    Fuel ................................................  31
    Fueling ............................................  32
    Fitting the Harness  .........................  33
    Balancing the Brushcutter  ..............  33
    Starting / Stopping 
    the Engine  ......................................  35
    Operating Instructions  ....................  38
    Cleaning the Air Filter  .....................  38
    Motor Management  ........................  39 Adjusting the Carburetor  ................  39
    Spark Arresting Screen 
    in Muffler  ........................................  41
    Checking the Spark Plug  ................  41
    Lubricating the Gearbox  .................  42
    Replacing the Starter Rope 
    and Rewind Spring  .........................  42
    Storing the Machine  .......................  45
    Metal Cutting Tools .........................  45
    Maintenance Chart  .........................  47
    Parts and Controls  .........................  49
    Specifications .................................  51
    Special Accessories  .......................  52
    Maintenance and Repairs  ..............  53
    STIHL Incorporated 
    Federal Emission Control 
    Warranty Statement ........................  54
    STIHL Incorporated 
    California Exhaust and
    Evaporative Emissions Control 
    Warranty Statement ........................  56
    Trademarks ....................................  58Allow only persons who understand this 
    manual to operate your trimmer/
    To receive maximum performance and 
    satisfaction from your STIHL trimmer/
    brushcutter, it is important that you read 
    and understand the maintenance and 
    safety precautions, starting on page 3, 
    before using your trimmer/brushcutter. 
    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/brushcutter 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.
    STIHLs philosophy is to continually 
    improve all of its products. As a result, 
    engineering changes and improve-
    ments are made from time to time. If  the 
    operating characteristics or the appear-
    ance of  your trimmer/brushcutter differs 
    from those described in this manual, 
    please contact your STIHL dealer for 
    information and assistance. 
    2 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    All the pictograms attached to the 
    machine are shown and explained in  
    this manual.
    The operating and handling instructions 
    are supported by illustrations.
    Symbols in text
    The individual steps or procedures 
    described in the manual may be marked 
    in different ways:
    :A bullet marks a step or procedure 
    without direct reference to an 
    A description of a step or procedure that 
    refers directly to an illustration may 
    contain item numbers that appear in the 
    Loosen the screw ( 1) 
    Lever ( 2) ... In addition to the operating instructions, 
    this manual may contain paragraphs 
    that require your special attention. Such 
    paragraphs are marked with the 
    symbols described below:
    Warning where there is a risk of an 
    accident or personal injury or 
    serious damage to property.
    Caution where there is a risk of 
    damaging the machine or its 
    individual components.
    Note or hint which is not essential 
    for using the machine, but may 
    improve the operator’s under-
    standing of the situation and result 
    in better use of the machine.
    Note or hint on correct procedure in 
    order to avoid damage to the 
    Equipment and features
    This instruction manual may refer to 
    several models with different 
    features. Components that are not 
    installed on all models and related 
    applications are marked with an 
    asterisk (*).  Such components may 
    be available as special accessories 
    from your STIHL dealer.
    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. If the 
    operating characteristics or the 
    appearance of your machine differ from 
    those described in this manual, please 
    contact your STIHL dealer for 
    Therefore some changes, modifications 
    and improvements may not be covered 
    in this manual.
    Guide to Using this Manual 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Because a trimmer/
    brushcutter is a high-
    speed, fast-cutting power 
    tool sometimes equipped 
    with sharp cutting blades, 
    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.
    The terminology utilized in this manual 
    when referring to the power tool reflects 
    the fact that different types of cutting 
    attachments 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). A 
    brushcutter designates a unit 
    equipped with a rigid metal blade. Many 
    FS models may be used as either a 
    trimmer or a brushcutter - therefore, the 
    power tool is referred in this manual as a 
    trimmer/brushcutter. Some smaller 
    and/or lightweight FS models may only 
    be used as a trimmer, i.e., they may not 
    be used with metal blades.  The term clearing saw indicates a 
    high-powered trimmer/brushcutter that 
    is particularly suited for use with a 
    circular saw blade to clear saplings or 
    small trees. FS models with an R on 
    the nameplate were originally 
    configured (at the time of distribution) as 
    a trimmer with a loop handle.
    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.
    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 
    and may cause blades to crack, chip or 
    break. Thrown objects, including broken 
    heads or blades, may result in serious or 
    fatal injury to the operator or bystanders.
    STIHL does not recommend the use of 
    rigid blades when cutting in stony areas. 
    Use your trimmer/brushcutter equipped 
    with the appropriate cutting attachment 
    only for cutting grass, brush, wood and 
    similar material. It must not be used for 
    any other purposes, since such misuse 
    may result in an accident or 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.
    Safety Precautions and 
    Working Techniques 
    4 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    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 
    trimmer/brushcutters. 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 model.
    Safe use of a trimmer/brushcutter 
    1. the operator
    2. the power tool
    3. the use of the power tool.THE OPERATOR
    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.
    Prolonged use of a power tool (or other 
    machines) exposing the operator to 
    vibrations may produce whitefinger 
    disease (Raynauds phenomenon) or 
    carpal tunnel syndrome. 
    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 white-
    finger 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 
    operators hands. An AV system is 
    recommended for those persons using 
    power tools on a regular or sustained 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    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. Wear gloves and 
    keep your hands warm. Take frequent 
    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. 
    !Warning! To reduce the risk of injury 
    to your eyes never 
    operate your power tool 
    unless wearing goggles or 
    properly fitted protective 
    glasses with adequate top 
    and side protection complying with ANSI 
    Z 87.1 (or your applicable national 
    standard). 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 glasses.
    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 
    Be particularly alert and cautious when 
    wearing hearing protection because 
    your ability to hear warnings (shouts, 
    alarms, etc.) is restricted.
    Always wear gloves when 
    handling the machine and 
    metal blades. Heavy-duty, 
    nonslip gloves improve 
    your grip and help to 
    protect 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 
    6 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    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.
    Good footing is very 
    important. Wear sturdy 
    boots with nonslip soles. 
    Steel-toed safety boots 
    are recommended.
    Wear an approved safety 
    hard hat to reduce the risk 
    of injury to your head 
    when there is a danger of 
    head injuries.
    For illustrations and definitions of the 
    power tool parts see the chapter on 
    “Main Parts and Controls.”
    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 “Power Tools and Accessories“ 
    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 
    389BA019 KN 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Always shut off the engine and make 
    sure the cutting attachment has stopped 
    before putting a trimmer/brushcutter 
    down. When transporting it in a vehicle, 
    properly secure it to prevent turnover, 
    fuel spillage and damage to the unit. 
    STIHL recommends that you keep metal 
    blades covered with the transport guard 
    (optional accessory).
    Your STIHL power tool uses an oil- 
    gasoline mixture for fuel (see the chap-
    ter on “Fuel” of your instruction manual).
    !Warning! Gasoline is an extremely 
    flammable fuel. If spilled 
    and ignited by a spark or 
    other ignition source, it 
    can cause fire and serious 
    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.
    Fueling Instructions 
    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, 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 
    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 immediately. 
    Different models may be equipped with 
    different fuel caps. Cap with grip
    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.
    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 
    triangular marks on the grip of the cap 
    and on the fuel tank opening lining up. 
    Using the grip, turn the cap firmly 
    clockwise as far as it will go (approx. a 
    quarter turn).
    Fold the grip flush with the 
    top of the cap. If the grip 
    does not lie completely 
    flush with the cap and the 
    detent on the grip does 
    not fit in the 
    corresponding recess in the filler neck, 
    the cap is not properly seated and 
    tightened and you must repeat the 
    above steps. 
    8 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    Screw cap
    Unit vibrations can cause 
    an improperly tightened 
    fuel filler cap to loosen or 
    come off and spill 
    quantities of fuel. In order 
    to reduce the risk of fuel 
    spillage and fire, tighten the fuel filler cap 
    by hand as securely as possible.
    Before Starting
    Always check your power tool for proper 
    condition and operation before starting, 
    particularly the throttle trigger, throttle 
    trigger interlock, 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 
    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.) and for cracked or 
    damaged heads or cracked, bent, 
    warped or damaged blades. Replace 
    damaged heads or blades before using 
    the power tool. Always keep blades 
    Keep the handles clean and dry at all 
    times; it is particularly important to keep 
    them free of moisture, pitch, oil, grease 
    or resin in order for you to maintain a firm 
    grip and properly control your power 
    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 
    ! Warning!
    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 
    Combinations of Cutting Attachment, 
    Deflector, Handle and Harness).
    As can be seen in that chart, some 
    cutting attachments may require you to 
    change your deflector, handle and/or 
    Keep the deflector (and the attached 
    skirt where appropriate) adjusted 
    properly at all times (see chapters on 
    Mounting the Deflector and Mounting 
    the Cutting Attachments of your 
    instruction manual). 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Arrows on the deflector 
    (A) and limit stop 
    (B)  (as seen from the underside)  show 
    the correct direction of rotation of the 
    cutting attachment. When viewed from 
    above, however, the cutting attachment 
    rotates  counterclockwise.
    Adjust carrying harness and hand grip 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, practice releasing the 
    unit from the harness as quickly as 
    Start the engine at least 10 feet 
    (3 meters) 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 
    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. 
    If you cannot set the correct idle speed, 
    have your STIHL dealer check your 
    power tool and make proper 
    adjustments and repairs.
    000BA006 KN
    000BA007 KN 
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