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Stihl Hs 81 R Manual

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    STIHL HS 81
    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 - 33
    Manual de 
    35 - 70 
    							Original Instruction Manual Printed on chlorine-free paper
    Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2011
    0458-442-8621-B. M2-6.G11.PM. 
    HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
    Allow only persons who fully understand 
    this manual to operate your hedge 
    To receive maximum performance and 
    satisfaction from your STIHL hedge 
    trimmer, it is important that you read, 
    understand and follow the safety 
    precautions and the operating and 
    maintenance instructions in chapter 
    Safety Precautions and Working 
    Techniques before using your hedge 
    trimmer. For further information you can 
    go to www.stihlusa.com.
    Contact your STIHL dealer or the STIHL 
    distributor for your area if you do not 
    understand any of the instructions in this 
    manual. Guide to Using this Manual 2
    Safety Precautions and Working 
    Techniques 3
    Using the Unit 11
    Fuel 12
    Fueling 13
    Rear Handle 15
    Starting / Stopping the Engine 15
    Cleaning the Air Filter 16
    Engine Management 17
    Adjusting the Carburetor 18
    Spark Arresting Screen in Muffler 19
    Checking the Spark Plug 19
    Lubricating the Gearbox 20
    Rewind Starter 21
    Storing the Machine 21
    Sharpening Instructions 22
    Inspections and Maintenance by 
    Dealer 22
    Maintenance and Care 23
    Main Parts 25
    Specifications 27
    Special Accessories 28
    Maintenance and Repairs 28
    STIHL Incorporated Federal 
    Emission Control Warranty 
    Statement 28
    STIHL Incorporated California 
    Exhaust and Evaporative 
    Emissions Control Warranty 
    Statement 30
    Trademarks 32Warning!
    Because a hedge trimmer is a high-
    speed cutting tool some special safety 
    precautions must be observed to reduce 
    the risk of personal injury. Careless or 
    improper use may cause serious or 
    even fatal injury. 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
    The meanings of the pictograms 
    attached to or embossed on the 
    machine are explained in this manual.
    Depending on the model concerned, the 
    following pictograms may be on your 
    Symbols in Text
    Many operating and safety instructions 
    are supported by illustrations.
    The individual steps or procedures 
    described in the manual may be marked 
    in different ways:
    NA bullet marks a step or procedure.A description of a step or procedure that 
    refers directly to an illustration may 
    contain item numbers that appear in the 
    illustration. Example:
    NLoosen the screw (1).
    NLever (2) ...
    In addition to the operating instructions, 
    this manual may contain paragraphs 
    that require your special attention. Such 
    paragraphs are marked with the 
    symbols and signal words described 
    Engineering Improvements
    STIHL’s philosophy is to continually 
    improve all of its products. As a result, 
    engineering changes and improvements 
    are made from time to time. Therefore, 
    some changes, modifications and 
    improvements may not be covered in 
    this manual. If the operating 
    characteristics or the appearance of your machine differs from those 
    described in this manual, please contact 
    your STIHL dealer for assistance.
    Guide to Using this Manual
    Fuel tank for gasoline 
    and engine oil mixture
    Press to operate manual 
    fuel pump
    Filler hole for gear 
    Starting lock
    Rotating rear handle
    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. 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
    3 Have your STIHL dealer show you how 
    to operate your power tool. Observe all 
    applicable local safety regulations, 
    standards and ordinances.
    Use your hedge trimmer only for cutting 
    hedges, shrubs, scrub, bushes and 
    similar material.Most of these safety precautions and 
    warnings apply to the use of all STIHL 
    hedge trimmers. Different models may 
    have different parts and controls. See 
    the appropriate section of your 
    instruction manual for a description of 
    the controls and the function of the parts 
    of your model.
    Safe use of a hedge trimmer involves
    1.the operator
    2.the power tool
    3.the use of the power tool.
    Physical Condition
    You must be in good physical condition 
    and mental health and not under the 
    influence of any substance (drugs, 
    alcohol, etc.) which might impair vision, 
    dexterity or judgment. Do not operate 
    this machine when you are fatigued.
    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 a hedge trim-
    mer is a high-speed, fast-
    cutting power tool with 
    sharp cutting blades, 
    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 manual and 
    the safety precautions 
    periodically. Careless or 
    improper use may cause 
    serious or fatal injury.
    Do not lend or rent your power tool with-
    out the instruction manual. Be sure that 
    anyone using it understands the infor-
    mation contained in this manual.
    The use of this machine may be hazard-
    ous. If the cutting tool comes in contact 
    with your body, it will cut you.
    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. 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TC 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 and keep your hands 
    –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.Avoid loose-fitting jackets, scarfs, 
    neckties, jewelry, flared or cuffed pants, 
    unconfined long hair or anything that 
    could become caught on branches, 
    brush or the moving parts of the unit. 
    Secure hair so it is above shoulder level.
    For illustrations and definitions of the 
    power tool parts see the chapter on 
    Main Parts. 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.
    To reduce the risk of 
    injury to your eyes never 
    operate your power tool 
    unless wearing goggles 
    or properly fitted protec-
    tive glasses with 
    adequate top and side protection com-
    plying 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 regularly.
    Always wear gloves 
    when handling the 
    machine and the cutting 
    tool. Heavy-duty, nonslip 
    gloves improve your grip 
    and help to protect your 
    Clothing must be sturdy 
    and snug-fitting, but allow 
    complete freedom of 
    movement. Wear long 
    pants made of heavy 
    material to help protect 
    your legs. Do not wear 
    shorts, sandals or go 
    Good footing is very 
    important. Wear sturdy 
    boots with nonslip soles. 
    Steel-toed safety boots 
    are recommended. 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
    5 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 ToolIt may be carried only in the horizontal 
    position. Grip the front handle and keep 
    the hot muffler away from your body and 
    the cutter blades behind you.
    Your STIHL power tool uses an oil- 
    gasoline mixture for fuel (see the 
    chapter on Fuel of your instruction 
    manual.)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 
    machine. Warning!
    Never modify this power tool in any way. 
    Only attachments supplied by STIHL or 
    expressly approved by STIHL for use 
    with the specific STIHL model are 
    authorized. Although certain unauthor-
    ized attachments are useable with 
    STIHL power tools, their use may, in 
    fact, be extremely dangerous.
    To reduce the risk of injury from blade 
    contact, never carry or transport your 
    power tool with the cutter blades 
    Always switch off the engine and fit the 
    scabbard over the cutter blades before 
    transporting the power tool over long 
    distances. When transporting it in a 
    vehicle, properly secure it to prevent 
    turnover, fuel spillage and damage to 
    the unit.
    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.
    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. 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
    6 Different models may be equipped with 
    different fuel caps.
    Toolless cap with grip
    To do this with this STIHL cap, raise the 
    grip on the top of the cap until it is upright 
    at a 90° angle. Insert the cap in the fuel 
    tank opening with the raised positioning 
    marks on the grip of the cap and on the 
    fuel tank opening lining up. Using the 
    grip, press the cap down firmly while 
    turning it clockwise as far as it will go 
    (approx. 1/4 turn).Misaligned, damaged or broken cap
    NIf the cap does not drop fully into the 
    opening when the positioning marks 
    line up and/or if the cap does not 
    tighten properly when twisted, the 
    base of the cap may be prematurely 
    rotated (in relation to the top) to the 
    closed position. Such misalignment 
    can result from handling, cleaning 
    or an improper attempt at 
    tightening.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 
    information. Warning!
    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 
    001BA220 KN
    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.
    Left: Base of cap in closed posi-
    tion (with open space)
    Right: Base of cap correctly posi-
    tioned for installation
    001BA227 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.
    001BA226 KN 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
    7 Before Starting
    Keep the handles clean and dry at all 
    times; it is particularly important to keep 
    them free of moisture, pitch, oil, fuel mix, 
    grease or resin in order for you to 
    maintain a firm grip and properly control 
    your power tool.STIHL recommends that you always 
    spray the cutter blades with STIHL resin 
    solvent before starting work – with the 
    engine stopped! You can obtain this 
    protective spray from your dealer. Apply 
    Start the engine at least 10 feet (3 m) 
    from the fueling spot, outdoors only.
    For specific starting instructions, see the 
    appropriate section of your manual. 
    Place the power tool on firm ground or 
    other solid surface in an open area. 
    Maintain good balance and secure 
    footing.Once the engine has started, 
    immediately blip the throttle trigger, 
    which should release the starting throttle 
    and allow the engine to slow down to 
    Important Adjustments Warning!
    Always check your power tool for proper 
    condition and operation before starting, 
    particularly the throttle trigger, throttle 
    trigger lockout, stop switch and cutting 
    tool. The throttle trigger (if applicable) 
    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 maintained.
    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 
    The cutting tool must be properly tight-
    ened and in safe operating condition. 
    Inspect for loose parts (nuts, screws, 
    etc.) and for cracked, bent, warped or 
    damaged blades. Regularly check the 
    condition and tightness of the cutter 
    blades – with the engine stopped! 
    Replace damaged cutter blades before 
    using the power tool. Always keep 
    blades sharp.
    To reduce the risk of injury from blade 
    contact, be absolutely sure that the cut-
    ting 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 blades on the cutting tool.
    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 tool, do not use your unit 
    with incorrect idle adjustment. At correct 
    idle speed, the cutting tool should not 
    move. For directions on how to adjust 
    idle speed, see the appropriate section 
    of your instruction manual. 
    							HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
    8 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.
    Right-hand Use
    Put your right hand on the rear handle, 
    left hand on the front handle.
    Operate the machine so that the cutting 
    blades are always away from your body.
    Left-hand Use
    Put your left hand on the rear handle, 
    right hand on the front handle.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.
    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 tool. Never touch 
    a moving cutting tool with your hand or 
    any other part of your body.
    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 fallen branches, 
    scrub and cuttings. Be extremely cau-
    tious when working on slopes or uneven 
    To reduce the risk of injury from loss of 
    control, never work on a ladder, in a tree 
    or any other insecure support. Never 
    hold the machine above shoulder 
    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. 
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