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Stihl 45 C Owners Manual

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    STIHL HS 45
    Read Instruction Manual thoroughly 
    before use and follow all safety 
    precautions – improper use can 
    cause serious or fatal injury.
    Antes de usar la máquina lea y siga 
    todas las precauciones de 
    seguridad dadas en el manual de 
    instrucciones – el uso incorrecto 
    puede causar lesiones graves o 
    							Instruction Manual
    1 - 32
    Manual de instrucciones
    33 - 69 
    							Original Instruction Manual Printed on chlorine-free paper
    Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2017
    0458-253-8621-B. VA1.A17. 
    HS 45
    {This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process 
    with electronic systems.
    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 
    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. Guide to Using this Manual 2
    Safety Precautions and Working 
    Techniques 3
    Using the Unit 12
    Fuel 13
    Fueling 14
    Starting / Stopping the Engine 14
    Operating Instructions 16
    Cleaning the Air Filter 16
    Engine Management 17
    Adjusting the Carburetor 17
    Spark Plug 18
    Engine Running Behavior 20
    Lubricating the Gearbox 20
    Storing the Machine 21
    Sharpening Instructions 21
    Inspections and Maintenance by 
    Dealer 21
    Maintenance and Care 22
    Main Parts 24
    Specifications 25
    Maintenance and Repairs 26
    Disposal 26
    Limited Warranty 27
    STIHL Incorporated Federal 
    Emission Control Warranty 
    Statement 27
    STIHL Incorporated California 
    Exhaust and Evaporative 
    Emissions Control Warranty 
    Statement 29
    Trademarks 31 
    							HS 45
    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 
    Indicates a hazardous situation that, if 
    not avoided, will result in death or 
    serious injury.
    Indicates a hazardous situation that, if 
    not avoided, could result in death or 
    serious injury.
    Indicates a risk of property damage, 
    including damage to the machine or its 
    individual components.
    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 or the STIHL 
    distributor for your area 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 
    							HS 45
    3 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 cutting tool comes in 
    contact with your body, it will cut you.
    Use your hedge trimmer only for cutting 
    hedges, shrubs, scrub, bushes and 
    similar material.
    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 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 
    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.
    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 (Raynaud's phenomenon) or 
    carpal tunnel syndrome.
    These conditions reduce the hand's 
    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 
    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. 
    							HS 45
    4 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 
    operator's 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.
    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.
    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".
    Never modify this power tool in any way. 
    Only attachments supplied by STIHL or 
    expressly approved by STIHL for use  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 complying with 
    ANSI Z87 "+" (or your 
    applicable national stand-
    ard.) 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 
    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 
    Always wear heavy duty 
    work gloves (e.g. made of 
    leather or other wear 
    resistant material) 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 45
    5 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.
    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 blade 
    contact, never carry or transport your 
    power tool with the cutter blades 
    moving.It 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.
    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.
    Your STIHL power tool uses an oil- 
    gasoline mixture for fuel (see the 
    chapter on "Fuel" of your instruction 
    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 and fumes, remove the fuel filler 
    cap on your power tool carefully so as to 
    allow any pressure build-up in the tank 
    t o  r e l e a s e  s l o w l y .  N e v e r  r e m o v e  t h e  f u e l  
    filler cap while the engine is running.
    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 combus-
    tible fuel vapor may 
    escape from the fuel 
    							HS 45
    6 Flip up the lever and slowly turn left (1) 
    to the vent position of the cap at about 
    1/8 turn where the cap is held in place by 
    the thread. Once the fumes have been 
    relieved, turn (2) the cap further to the 
    1/4 turn position where the tool-less cap 
    can be removed from the tank thread.
    Never remove the fuel filler cap by 
    quickly turning it to the full 1/4 open 
    position without letting it vent out any 
    vapor/pressure build-up at the 
    1/8 position.
    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 
    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.
    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 
    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 
    001BA220 KN
    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 
    							HS 45
    7 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.Before Starting
    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.
    Check fuel system for leaks, especially 
    the visible parts, e.g., filler cap, hose 
    connections, manual fuel pump (only for 
    power tools equipped with a manual fuel 
    pump). Do not start the engine if there 
    are leaks or damage – risk of fire! Have 
    the machine repaired by a servicing 
    dealer before using it.
    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 
    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.
    The cutting tool must be properly 
    tightened 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.
    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 
    To reduce the risk of injury from blade 
    contact, be absolutely sure that the 
    cutting 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. 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 45
    8 Once the engine has started, 
    immediately blip the throttle trigger, 
    which should release the starting throttle 
    and allow the engine to slow down to 
    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 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.If you cannot set the correct idle speed, 
    have your STIHL dealer check your 
    power tool and make proper 
    adjustments and repairs.
    During Operation
    Holding and Controlling the Power Tool
    Always hold the unit firmly with both 
    hands on the handles while you are 
    working. Wrap your fingers and thumbs 
    around the handles.
    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.
    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, overgrown 
    terrain. Watch for hidden obstacles such 
    as tree stumps, roots and ditches to 
    avoid stumbling. For better footing, clear 
    away fallen branches, 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, in a tree 
    or any other insecure support. Never 
    hold the machine above shoulder 
    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. 
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