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Stihl Ht 75 Owners Manual

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    							10 english
    HT 70, HT 75!
    To reduce risk of serious or fatal injury 
    from loss of control of the pole pruner 
    never attempt to operate any pole 
    pruner with one hand. Always hold the 
    pole pruner firmly with both hands.
    Wrap your fingers tightly around the 
    control handle and shaft, keeping the 
    handle and shaft between your thumb 
    and forefinger.Keep your hands in this position to have 
    your pole pruner under control at all 
    times. Make sure the handle and shaft 
    are in good condition and free of 
    moisture, pitch, oil or grease. Place your 
    left hand on front handle and your right 
    hand on rear handle and throttle trigger. 
    Left handers should follow these 
    instructions too.
    Do not operate your pole pruner with the 
    starting throttle lock engaged. Cutting 
    with the starting throttle lock engaged 
    does not permit the operator proper 
    control of the pole pruner or chain 
    speed. Always cut at full throttle.
    Never touch a chain with your hand or 
    any part of your body when the engine is 
    running, even when the chain is not 
    rotating. The chain continues to rotate 
    for a short period after the throttle trigger 
    is released.
    Do not cut any material other than wood 
    or wooden objects. Use your pole pruner 
    for limbing only. It is not designed for 
    felling. It is not designed for prying or 
    shoveling away limbs, roots or other 
    objects.When limbing, make sure that the saw 
    chain does not touch any foreign 
    materials such as rocks, fences, nails 
    and the like. Such objects may be flung 
    off and injure the operator or bystanders, 
    or damage the saw chain.
    In order to keep control of your pole 
    pruner, always maintain a firm foothold. 
    Never work on a ladder, in a tree or on 
    any other insecure support. When 
    working at a height above 4.5 m (15 ft) 
    use a lift bucket.
    For pole pruner with adjustable shaft: 
    Expand the shaft only as far as 
    necessary for the intended application.
    Dont put pressure on the pole pruner 
    when reaching the end of a cut. The 
    pressure may cause the bar and rotating 
    chain to pop out of the cut or kerf, go out 
    of control and strike the operator or 
    some other object.
    Prior to limbing, clear the working area 
    from interfering limbs and brush. Then, 
    establish a path of escape and remove 
    all obstacles.
    390BA026 KN 
    							11 HT 70, HT 75english
    Keep work area clear – move away 
    fallen limbs. Place all tools and 
    equipment at a safe distance from the 
    branches being limbed, but not on the 
    escape path.
    To reduce the risk of personal or even 
    fatal injury from falling objects do not cut 
    vertically above your body. Hold the pole 
    pruner at an angle of not more than 60° 
    from the horizontal level (see picture). 
    Objects may fall in unexpected 
    directions. Do not stand directly 
    underneath the limb being cut!Watch for falling wood! As soon as the 
    limbed branch starts to fall, step aside 
    and keep distance away from the falling 
    Always observe the general condition of 
    the tree. Look for decay and rot in the 
    trunk and branches. If it is rotted inside, 
    it could snap and fall toward the operator 
    while being cut. Also look for broken or 
    dead branches which could vibrate 
    loose and fall on the operator.
    If branch is thick or heavy, make a 
    shallow relief cut on the bottom of the 
    branch before cutting down from the top 
    to help prevent splitting of the branch. 
    Always pull the unit out of the cut with 
    the chain running to reduce the 
    possibility of pinching the cutting 
    If the bar becomes pinched and caught 
    in the branch so that the chain can no 
    longer move, shut off the pruner and 
    carefully move the branch to open the 
    pinch and release the bar.
    Maintenance, replacement, or repair 
    of the emission control devices and 
    systems may be performed by any 
    nonroad engine repair establishment 
    or individual. However if you claim 
    warranty for a component which has 
    not been serviced or maintained 
    properly or if nonapproved 
    replacement parts were used, STIHL 
    may deny warranty.
    Never operate a pole pruner that is 
    damaged, improperly adjusted or not 
    completely or securely assembled. 
    Follow the maintenance and repair 
    instructions in the appropriate section of 
    your Owners Manual, especially those 
    in the chapters  Mounting the Bar and 
    Chain and Maintaining and 
    Sharpening Saw Chain.
    Use only STIHL replacement parts for 
    maintenance and repair. Use of parts 
    manufactured by others may cause 
    serious or fatal injury.
    390BA025 KN 
    							12 english
    HT 70, HT 75!
    Always shut off the engine and ensure 
    that the chain is stopped before 
    undertaking any adjustments, 
    maintenance or repair work, changing 
    the saw chain or cleaning the pole 
    pruner. Do not attempt any maintenance 
    or repair work not described in your 
    Owners Manual. Have such work 
    performed at your STIHL service shop 
    Never test the ignition system with 
    ignition wire terminal removed from 
    spark plug or with unseated spark plug, 
    since uncontained sparking may cause 
    a fire.
    To reduce the risk of fire and burn injury, 
    use only spark plugs authorized by 
    STIHL. Always press spark plug boot 
    snugly onto spark plug boot of the 
    proper size. (Note: If terminal has 
    detachable SAE adapter nut, it must be 
    attached.) A loose connection between spark plug 
    boot and ignition wire connector in the 
    boot may create arcing that could ignite 
    combustible fumes and cause a fire. 
    Keep spark plug clean, and make sure 
    ignition lead is in good condition.
    Do not operate your pole pruner if the 
    muffler is damaged, missing or modified. 
    An improperly maintained muffler will 
    increase the risk of fire and hearing loss. 
    Never touch a hot muffler or burn will 
    result. If your muffler was equipped with 
    a spark-arresting screen to reduce the 
    risk of fire (e. g. in the USA, Canada and 
    Australia), never operate your pole 
    pruner if the screen is missing or 
    damaged. Remember that the risk of 
    forest fires is greater in hot or dry 
    Keep the chain, bar and sprocket clean; 
    replace worn sprockets or chains. Keep 
    the chain sharp. You can spot a dull 
    chain when easy-to-cut wood becomes 
    hard to cut or burn marks appear on the 
    wood.Keep the chain at proper tension. 
    Tighten all nuts, bolts and screws except 
    the carburetor adjustment screws before 
    each use.
    Additionally, the daily maintenance 
    schedule for your pole pruner set forth in 
    your STIHL Owners Manual should be 
    strictly followed.
    Store pole pruner in a dry place and 
    away from children. Before storing for 
    longer than a few days, always empty 
    the fuel tank.
    For any maintenance please refer to the 
    maintenance chart and to the warranty 
    statement near the end of this manual. 
    Store fuel and chain oil in approved and 
    properly labeled safety-type canisters 
    only. Take care when handling gasoline! 
    Avoid direct contact with the skin and 
    avoid inhaling fuel vapor! 
    							13 HT 70, HT 75english
    Preparations:Wear suitable protective clothing 
    and equipment – see chapter 
    Safety Precautions.
    :Adjust telescopic shaft to the 
    required length (HT 75 only).
    :Start the engine.
    :Put on the shoulder strap.
    Never throw cuttings into the 
    household garbage can – cuttings 
    can be composted.
    Never stand directly underneath the 
    branch you are cutting – be wary of 
    falling branches. Note that a branch 
    may spring back at you after it hits 
    the ground.Cutting sequenceTo allow branches a free fall, always cut 
    the lower branches first. Prune heavy 
    branches (large diameter) in several 
    controllable pieces.
    Working techniquesHold the control handle with your right 
    hand, and the shaft with your left hand. 
    Your left arm should be extended to the 
    most comfortable position.
    HT 70:
    Always hold the shaft with your left hand 
    in the area of the handle hose.
    The shaft should always be held at an 
    angle of 60° or less.The most convenient working position is 
    a tool angle of 60°, but any lesser angle 
    may be used to suit the situation 
    Position the cutting attachment with the 
    hook against the branch and then 
    perform the cross-cut.
    Using the Pole Pruner
    390BA018 KN
    390BA052 KN 
    							14 english
    HT 70, HT 75 Relieving cut
    :To avoid kickback, pinching the bar 
    or tearing the bark when pruning 
    thick branches, always start by 
    performing a relieving cut (1) on the 
    underside of the branch.
    :To do this, apply the cutting 
    attachment and pull it across the 
    bottom of the branch as far as the 
    bar nose.
    :Locate the hook against the branch 
    and then perform the cross-cut (2).Flush-cutting thick branches
    :If  branch diameter is more than 4“ 
    (10cm), first perform undercut (3) 
    and then cross-cut at a distance of  
    about 8“ (20cm) (A) from the final 
    Then carry out the flush-cut (4), 
    starting with a relieving cut and 
    finishing with a cross-cut.Cutting above obstacles
    The units long reach makes it possible 
    to prune branches that are overhanging 
    obstacles, such as rivers or lakes. The 
    tool angle in this case depends on the 
    position of the branch.
    390BA041 KN
    390BA024 KN
    390BA020 KN 
    							15 HT 70, HT 75english
    Cutting from a lift bucket
    The units long reach enables cutting to 
    be performed next to the trunk without 
    the risk of the lift bucket damaging other 
    branches. The tool angle depends on 
    the position of the branch.30° angle drive
    (special accessory for HT 70)
    The angle drive keeps the cutting 
    attachment at an angle of 30° to the 
    drive tube.
    The angle drive may be adjusted on the 
    drive tube to the following positions only:
    1:For cross-cutting vertical branches 
    and bushes.
    2:For a better view of the cutting 
    390BA017 KN
    390BA053 KN 
    							16 english
    HT 70, HT 75 :Unscrew nut and take off cover.
    :Turn tensioning screw (1) 
    counterclockwise until the 
    tensioning nut (2) butts against the 
    left end of the housing slot, then 
    back it off 5 full turns.The chain is very sharp – wear work 
    gloves to protect hands from cuts.
    :Fit the chain – 
    start at the bar nose.:Fit guide bar over the stud (3). 
    Engage peg of tensioner slide in 
    locating hole (4) – place the chain 
    over sprocket (5) at the same time.
    :Now turn tensioning screw (1) 
    clockwise until there is very little 
    chain sag on the underside of the 
    bar – and the drive link tangs are 
    located in the bar groove.
    :Refit the sprocket cover and screw 
    on the nut only fingertight.
    :Now refer to Tensioning the Saw 
    Chain.Mounting the Bar and Chain
    390BA042 KN
    390BA043 KN
    390BA003 KN
    1 5
    390BA044 KN
    							17 HT 70, HT 75english
    Retensioning during cutting work: 
    :Shut off the engine and then 
    slacken the nut.
    :Hold the bar nose up.
    :Use screwdriver to turn the 
    tensioning screw (1) clockwise until 
    chain fits snugly against the 
    underside of the bar. 
    Tighten down the nut  firmly.
    A new chain has to be retensioned more 
    often than one that has been in use for 
    some time – check chain tension 
    frequently – see chapter Operating 
    Instructions / During Operation“. 
    :Check chain tension.:Shut down the engine.
    :Wear work gloves to protect hands.
    :Chain must fit snugly against the 
    underside of the bar and it must still 
    be possible to pull the chain along 
    the bar by hand.
    :If necessary, retension the chain.
    A new chain has to be retensioned more 
    often than one that has been in use for 
    some time.
    Check chain tension frequently – 
    see chapter Operating Instructions / 
    During Operation“. A properly adjusted throttle cable is 
    the precondition for correct 
    operation in the full throttle, starting 
    throttle and idle positions.
    Adjust the throttle cable only after 
    the unit is fully assembled.
    :Use a suitable tool to push the slide 
    to the bottom of the slot (see 
    * see Guide to Using this Manual
    Tensioning the Saw Chain
    390BA045 KN
    Checking Chain Tension
    390BA046 KN
    Adjusting the Throttle 
    002BA163 KN 
    							18 english
    HT 70, HT 75 :Press down the trigger interlock (1) 
    and squeeze the throttle trigger (2)  
    (full throttle) – this sets the throttle 
    cable correctly.This engine is certified to operate on 
    unleaded gasoline and the STIHL two-
    stroke engine oil at a mix ratio of 50:1.
    Your two-stroke engine requires a 
    mixture of brand-name gasoline and 
    quality two-stroke air cooled engine oil.
    Use mid-grade unleaded gasoline with a 
    minimum octane rating of  89 (R+M/2). If 
    the octane rating of the mid-grade 
    gasoline in your area is lower, use 
    premium unleaded fuel. 
    Fuel with a lower octane rating may  
    increase engine temperatures. This, in 
    turn, increases the risk of piston seizure 
    and damage to the engine.
    The chemical composition of the fuel is 
    also important. Some fuel additives not 
    only detrimentally affect elastomers 
    (carburetor diaphragms, oil seals, fuel 
    lines, etc.), but magnesium castings and 
    catalytic converters as well. This could 
    cause running problems or even 
    damage the engine. For this reason 
    STIHL recommends that you use only 
    nationally recognized name brand 
    unleaded gasoline!Use only STIHL two-stroke engine oil or 
    equivalent branded two-stroke engine 
    oils that are designed for use only in air 
    cooled two-cycle engines. 
    We recommend  STIHL 50:1 two-stroke 
    engine oil since it is specially formulated 
    for use in STlHL engines.
    Do not use BIA or TCW rated (two-
    stroke water cooled) mix oils or other 
    mix oils that state they are for use in both 
    water cooled and air cooled engines 
    (e.g., outboard motors, snowmobiles, 
    chain saws, mopeds, etc.).
    Take care when handling gasoline. 
    Avoid direct contact with the skin and 
    avoid inhaling fuel vapor. When filling at 
    the pump, first remove the canister from 
    your vehicle and place the canister on 
    the ground before filling. Do not fill fuel 
    canisters that are sitting in or on a 
    The canister should be kept tightly 
    closed in order to avoid any moisture 
    getting into the mixture.
    The machine‘s fuel tank and the canister 
    in which fuel mix is stored should be 
    cleaned as necessary.
    002BA161 KN
    							19 HT 70, HT 75english
    Fuel mix ages
    Only mix sufficient fuel for a few days 
    work, not to exceed 3 months of storage. 
    Store in approved fuel-canisters only. 
    When mixing, pour oil into the canister 
    first, and then add gasoline. Close the 
    canister and shake it vigorously by hand 
    to ensure proper mixing of the oil with 
    the fuel.       
    Dispose of empty mixing-oil canisters 
    only at authorized disposal locations.Before fueling, clean the filler cap and 
    the area around it to ensure that no dirt 
    falls into the tank.
    Always thoroughly shake the mixture in 
    the canister before fueling your 
    In order to reduce the risk of burns 
    or other personal injury from 
    escaping gas vapor and fumes, 
    remove the fuel filler cap carefully 
    so as to allow any pressure build-up 
    in the tank to release slowly.
    After fueling, tighten fuel cap 
    as securely as possible by hand. Change the fuel pick up body every year.
    Before storing your machine for a long 
    period, drain and clean the fuel tank and 
    run engine until carburetor is dry.
    Checking oil level
    Check chain oil level in tank at 
    regular short intervals and fill up as 
    necessary. Gaso-
    lineOil (STIHL 50:1 or 
    equivalent branded oils)
    US gal. US fl.oz
    2 1/2 6.4
    389BA031 KN
    389BA032 KN 
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