STIHL HS 56, HS 46 Owner's Manual

STIHL HS 46, 56

WARNING

Read and follow all safety precautions in Instruction Manual – improper use can cause serious or fatal injury.

ADVERTENCIA

Lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones – el uso incorrecto puede causar lesiones graves o mortales.

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Instruction Manual Manual de instrucciones

Instruction Manual 1 - 33

Manual de instrucciones 34 - 70

Contents

English

Guide to Using this Manual 2 Safety Precautions and Working

Techniques 2 Using the Unit 10 Fuel 11 Fueling 12 Starting / Stopping the Engine 14 Operating Instructions 17

Original Instruction ManualPrinted on chlorine-free paper

Cleaning the Air Filter 17 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 Maintenance and Care 23 Main Parts 25 Specifications 26 Special Accessories 27 Maintenance and Repairs 28

Printing inks contain vegetable oils, paper can be recycled.

Disposal 28 STIHL Incorporated Federal

Emission Control Warranty Statement 28

STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement 30

Trademarks 33

Allow only persons who fully understand this manual to operate your hedge trimmer.

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.

WARNING

Because a hedge trimmer is a highspeed 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.

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HS 46, HS 46 C, HS 56 C

English

Guide to Using this Manual

Pictograms

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 machine.

Fuel tank for gasoline and engine oil mixture

Press to operate manual fuel pump

Filler hole for gear lubricant

Starting lock

Rotating rear handle

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:

N A 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:

N Loosen the screw (1). N 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 and signal words described below:

DANGER

Indicates an imminent risk of severe or fatal injury.

WARNING

Indicates a hazardous situation which, if not avoided, could result in severe or fatal injury.

NOTICE 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 for assistance.

Safety Precautions and Working Techniques

Because a hedge trim mer is a high-speed, fastcutting 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.

Have your STIHL dealer show you how to operate your power tool. Observe all applicable local safety regulations, standards and ordinances.

WARNING

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.

WARNING

The use of this machine may be hazardous. If the cutting tool comes in contact with your body, it will cut you.

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Use your hedge trimmer only for cutting hedges, shrubs, scrub, bushes and similar material.

WARNING

Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine.

WARNING

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.

WARNING

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.

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.

WARNING

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.

WARNING

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

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

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.

WARNING

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

HS 46, HS 46 C, HS 56 C

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0008BA024 KN

consult their physician and the pacemaker manufacturer before operating this tool.

Proper Clothing

WARNING

To reduce the risk of injury, the operator should wear proper protective apparel.

WARNING

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 Z 87.1 (or your applicable national stand ard.) If there is a risk of facial injury, STIHL rec

ommends that you also wear a face shield or face screen over your gog

gles 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.

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 the cutting tool. 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 barefoot.

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.

THE POWER TOOL

For illustrations and definitions of the power tool parts see the chapter on "Main Parts."

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

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.

THE USE OF THE POWER TOOL

Transporting the Power Tool

WARNING

To reduce the risk of injury from blade contact, never carry or transport your power tool with the cutting 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 cutting blades behind you.

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WARNING

Always switch off the engine and fit the scabbard over the cutting 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.

Fuel Your STIHL power tool uses an oil-

gasoline mixture for fuel (see the chapter 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 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 combusti ble fuel vapor may escape from the fuel system.

Fueling Instructions

WARNING

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 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

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.

WARNING

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.

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 positioning mark 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).

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.

Misaligned, damaged or broken cap N If 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

HS 46, HS 46 C, HS 56 C

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001BA238 KN

001BA239 KN

can result from handling, cleaning or an improper attempt at tightening.

Left: Bottom of cap is twisted –

inner mark (1) in line with outer mark.

Right: Bottom of cap in correct posi

tion – inner mark is under the grip. It is not in line with the outer mark.

N To 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.

N If 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.

See also the "Fueling" chapter in your Instruction Manual for additional information.

Before Starting

WARNING

Always check your power tool for proper condition and operation before starting. The Master Control lever must move easily in direction of STOP or † and spring back to the normal run position F. Action of Master Control lever, throttle trigger lockout and throttle trigger must be smooth – the throttle trigger must return automatically to the idle position. The Master Control lever must spring back from the l and n positions to the normal run position F when the throttle trigger lockout and throttle trigger are squeezed. Never attempt to modify the controls or safety devices.

WARNING

Never use a power tool that is damaged or not properly maintained.

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.

WARNING

The cutting blades 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 cutting blades – with the engine stopped! Replace damaged cutting blades before using the power tool. Always keep blades sharp.

STIHL recommends that you always spray the cutting blades with STIHL resin solvent before starting work – with the engine stopped! You can obtain this protective spray from your STIHL dealer. Apply generously.

Starting Start the engine at least 10 feet (3 m)

from the fueling spot, outdoors only. For specific starting instructions, see the

chapter "starting / stopping the engine" of your instruction manual. Place the power tool on firm ground or other solid surface in an open area. Maintain good balance and secure footing.

WARNING

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 fire.

WARNING

To reduce the risk of injury from blade contact, be absolutely sure that the cutting blades are clear of you and all other obstructions and objects, including the ground, because when the engine

HS 46, HS 46 C, HS 56 C

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0008BA001 KN

0008BA002 KN

starts at starting-throttle, engine speed will be fast enough for the clutch to engage and move the blades on the cutting tool.

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.

WARNING

Your power tool is a one-person machine. Do not allow other persons in the general work area, even when starting.

WARNING

To reduce the risk of injury from loss of control, do not attempt to "drop start" your power tool.

WARNING

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 mechanism.

Important Adjustments

WARNING

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.

WARNING

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 blades. Never touch a moving cutting blades with your hand or any other part of your body.

WARNING

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.

HS 46, HS 46 C, HS 56 C

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WARNING

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 height.

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

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 respira tory problems, 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 inhaling toxic fumes, never run the machine indoors or in poorly venti lated locations.

WARNING

If the vegetation being cut or the surrounding 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.

WARNING

Inhalation of certain dusts, especially organic dusts such as mold or pollen, can cause susceptible persons to have an allergic or asthmatic reaction.

Substantial or repeated inhalation of dust and other airborne contaminants, in particular those with a smaller particle size, may cause respiratory or other illnesses. Control dust at the source where possible. Use good work practices, 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 recommendations of EPA/OSHA/NIOSH and occupational and trade associations with respect to dust ("particulate matter".) 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 encountered.

Operating Instructions

WARNING

Do not operate your power tool using the starting throttle lock, as you do not have control of the engine speed.

In the event of impending danger or in an emergency, switch off the engine immediately – move the Master Control lever in the direction of STOP or †.

WARNING

The cutting blades continue to move for a short period after the throttle trigger is released (flywheel effect.)

Accelerating the engine while the blades are blocked increases the load and will cause the clutch to slip continuously. This may result in overheating and damage to important components (e.g. clutch, polymer housing components) – which can then increase the risk of injury from the blades moving while the engine is idling.

WARNING

Before you start work, examine the hedge area for stones, fence wire, metal or other solid objects which could damage the cutting blades.

Take particular care when cutting hedges next to or against wire fences. Do not touch the wire with the cutting blades. When working close to the ground, make sure that no sand, grit or stones get between the cutting blades.

Striking solid foreign objects such as stones, fence wire or metal could damage the cutting attachment and may cause the blades to crack, chip or break. STIHL does not recommend the use of your power tool when cutting in areas where the blades could contact such objects.

WARNING

Observe the cutting blades at all times – do not cut any areas of the hedge that you cannot see. When cutting the top of a taller hedge, check the other side of

HS 46, HS 46 C, HS 56 C

English

the hedge frequently for bystanders, animals and obstructions. Do not damage the property or other persons.

DANGER

Your power tool is not insulated against electric shock. To reduce the risk of electrocution, never operate this power tool in the vicinity of any wires or cables (power, etc.) which may be carrying electric current.

WARNING

If the cutting blades becomes clogged or stuck, always turn off the engine and make sure the cutting blades has stopped before cleaning. Grass, weeds, etc. should be cleaned off the cutting blades at regular intervals.

Check the cutting blades at regular short intervals during operation, or immediately if there is a noticeable change in cutting behavior:

– Shut off the engine. – Wait until the cutting blades have

come to a complete standstill.

– Check condition and tightness, look

for cracks.

– Check sharpness. – Replace damaged or dull cutting

blades immediately, even if they have only superficial cracks.

WARNING

The gearbox becomes hot during operation. To reduce the risk of burn injury, do not touch the gear housing when it is hot.

WARNING

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.

WARNING

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 (e.g. the trunk of a felled tree) away from any combustible substances.

WARNING

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.

After Finishing Work Always clean dust and dirt off the

machine – do not use any grease solvents for this purpose.

Spray the blades with STIHL resin solvent. Start and run the engine briefly so that the solvent is evenly distributed.

MAINTENANCE, REPAIR AND STORING

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 make a warranty claim for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny coverage.

WARNING

Use only identical STIHL replacement parts for maintenance and repair. Use of non-STIHL parts may cause serious or fatal injury.

Strictly follow the maintenance and repair instructions in the appropriate section of your instruction manual. Please also refer to the maintenance chart in this manual.

WARNING

Always stop the engine and make sure that the cutting blades are stopped before doing any maintenance or repair work or cleaning the power tool. Do not attempt any maintenance or repair work not described in your instruction manual. Have such work performed by your STIHL servicing dealer only.

Wear gloves when handling or performing maintenance on blades.

HS 46, HS 46 C, HS 56 C

English

WARNING

Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition. Always press spark plug boot snugly onto spark plug terminal of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be securely attached.) A loose connection between spark plug terminal and the ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.

WARNING

Never test the ignition system with the ignition wire boot removed from the spark plug or with a removed spark plug, since uncontained sparking may cause a fire.

WARNING

Do not operate your power tool if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss. Your muffler is equipped with a sparkarresting screen to reduce the risk of fire; never operate your power tool if the screen is missing, damaged or clogged. Remember that the risk of a brush or forest fire is greater in hot or dry weather.

In California, it is a violation of § 4442 or

§ 4443 of the Public Resources Code to use or operate gasoline-powered tools on forest-covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a complying spark arrester that is maintained in effective working order.

The owner/operator of this product is responsible for properly maintaining the spark arrester. Other states or governmental entities/agencies, such as the U.S. Forest Service, may have similar requirements. Contact your local fire agency or forest service for the laws or regulations relating to fire protection requirements.

WARNING

Never repair damaged cutting attachments by welding, straightening or modifying the shape. This may cause parts of the cutting blades to come off and result in serious or fatal injuries.

Keep the cutting blades sharp. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.

Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine.

Store the power tool in a dry and high or locked location out of reach of children.

Before storing for longer than a few days, always empty the fuel tank. See chapter "Storing the machine" in this manual.

Using the Unit

Cutting Season

Observe country-specific or municipal rules and regulations for cutting hedges.

Do not use your power tool during other people's rest periods.

Cutting Sequence

Use lopping shears or a chain saw to cut out thick branches first.

Cut both sides of the hedge first, then the top.

Disposal

Do not throw cuttings into the garbage can – they can be composted!

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0008BA003 KN

0008BA004 KN

0008BA005 KN

Working Technique

Vertical cut

Swing the cutting blade from the bottom upwards in an arc – lower the nose of the blade, move along the hedge and then swing the blade up again in an arc.

Any working position above head height is tiring. To minimize the risk of accidents, work in such positions for short periods only.

Horizontal cut

Hold the cutter bar at an angle of 0° to 10° as you swing the hedge trimmer horizontally.

Swing the cutting blade in an arc towards the outside of the hedge so that the cuttings are swept to the ground.

Repeat the procedure several times on wide hedges.

Fuel

This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.

Your engine requires a mixture of highquality gasoline and two-stroke air cooled engine oil.

Use mid-grade unleaded gasoline with a minimum octane rating of 89 ((R+M)/2) and no more than 10% ethanol content.

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 high-quality unleaded gasoline!

Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines with a manually adjustable carburetor and should not be used in such engines.

The ethanol content in gasoline affects engine running speed – it may be necessary to readjust the carburetor if you use fuels with various ethanol contents.

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0008BA025 KN

WARNING

To reduce the risk of personal injury from loss of control and/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.

If your power tool shows an incorrect idle adjustment, have your STIHL dealer check your power tool and make proper adjustments and repairs.

The idle speed and maximum speed of the engine change if you switch from a fuel with a certain ethanol content to another fuel with a much higher or lower ethanol content.

This problem can be avoided by always using fuel with the same ethanol content.

Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines.

We rec ommend STIHL HP Ult ra 2-Cycle Engine Oil since it is specially formulated for use in STIHL engines.

Do not use BIA or TCW rated (twostroke 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.).

container on the ground before filling. To reduce the risk of sparks from static discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer.

The container should be kept tightly closed in order to limit the amount of moisture that gets into the mixture.

The machine‘s fuel tank should be cleaned as necessary.

Fuel mix ages

Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-containers only. When mixing, pour oil into the container first, and then add gasoline. Close the container and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.

Gaso line

Oil (STIHL 50:1 or equiva lent high-quality oils)

US gal. US fl.oz.

12.6 2 1/2 6.4 5 12.8

Dispose of empty mixing-oil containers only at authorized disposal locations.

Fueling

Preparations

N 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 machine.

N Position the machine so that the

filler cap is facing up.

WARNING

In order to reduce the risk of fire and 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

WARNING

Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the container from your vehicle and place the

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Opening

001BA236 KN

001BA232 KN

001BA234 KN

001BA237 KN

001BA234 KN

001BA233 KN

001BA231 KN

001BA235 KN

English

N Raise handle.

N Twist filler cap counterclockwise

(approx. 1/4 turn).

Markings on filler cap and housing must align.

N Remove the filler cap.

Refueling

Take care not to spill fuel while fueling and do not overfill the tank – leave approx. 1/2" (13 mm) air space.

Closing

Handle is in an upright position: N Position filler cap – markings on filler

cap and housing must align.

N Push the filler cap down as far as it

will go.

N Push the filler cap down and twist it

clockwise until it engages.

Then the markings on filler cap and housing will align.

N Flip the handle down.

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001BA241 KN

001BA238 KN

001BA239 KN

0008BA007 KN

STOP

Starting / Stopping the Engine

Positions and Functions of Master Control Lever

Filler cap is now closed.

If the filler cap will not engage into the tank housing

The base of the filler cap is rotated in relation to the upper part.

N Look at the black alignment marks

on the top of the filler cap.

Left: Base of filler cap is rotated –

interior marking (1) is aligned with the exterior marking.

Right: Base of filler cap is in the cor

rect position – interior marking is below the clip. It does not align with the exte rior marking.

N With the filler cap in the filling neck,

twist it counterclockwise until it drops into its seat.

N Continue to twist the filler cap

counterclockwise (approx. 1/4 turn) – this will twist the base of the cap into the correct position.

N While pushing down on the cap,

twist the filler cap clockwise and close it – see section "Closing."

STOP or † – Master Control lever must be pushed in direction of STOP or † to switch off the ignition. When released, the Master Control lever springs back to the normal run position F and the ignition is switched on again.

Normal run position F – engine runs or can fire.

Starting throttle n – this position is used to start a warm engine. The Master Control lever moves to the normal run position F when the throttle trigger is squeezed.

HS 46, HS 46 C, HS 56 C

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0008BA008 KN

0008BA009 KN

0008BA010 KN

0008BA011 KN

Choke closed l – this position is used to start a cold engine. The Master Control lever moves to the normal run position F when the throttle trigger is squeezed.

Setting the Master Control Lever

To move the Master Control lever from the normal run position F to choke closed l, press down the throttle trigger lockout and squeeze the throttle trigger at the same time and hold them in that position – now set the Master Control lever.

To select the starting throttle position n, move the Master Control lever to choke closed l first, then push it into the starting throttle position n.

The Master Control lever moves from the starting throttle position n or choke closed position l to the normal run position F when you press down the throttle trigger lockout and blip the throttle trigger at the same time.

To switch off the engine, move the Master Control lever in the direction of STOP or † – when released, the Master Control lever springs back to the normal run position F.

Starting the Engine

N Press the fuel pump bulb at least

five times – even if the bulb is filled with fuel.

N Set the Master Control lever to suit

the engine temperature.

Cold engine (cold start)

N Depress the throttle trigger

lockout (1) and the throttle trigger (2) at the same time – hold both levers in that position.

N Move the Master Control lever (3) to

N Release the throttle trigger

lockout (1), throttle trigger (2) and Master Control lever.

Warm engine (warm start)

N Depress the throttle trigger

lockout (1) and the throttle trigger (2) at the same time – hold both levers in that position.

N Move the Master Control lever (3) to

N Release the throttle trigger

lockout (1), throttle trigger (2) and Master Control lever.

Also use this setting if the engine has been running but is still cold.

Starting

N Place the unit on the ground. N Remove the blade scabbard. Check

that the cutting blades are not touching the ground or any other obstacles.

HS 46, HS 46 C, HS 56 C

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0008BA012 KN

0008BA013 KN

N Make sure you have a safe and

secure footing.

N Hold the unit firmly with your left

hand on the fan housing and press down.

N Hold the starter grip with your right

hand.

Version without Easy2Start N Pull the starter grip slowly until you

feel it engage and then give it a brisk strong pull.

NOTICE Do not pull out the starter rope all the

way – it might otherwise break. N Do not let the starter grip snap back.

Guide it slowly back into the housing so that the starter rope can rewind properly.

Version with Easy2Start N Pull the starter grip steadily.

As soon as the engine runs

run position F. After a cold start, warm up the engine by opening the throttle several times.

WARNING

Make sure the carburetor is correctly adjusted. The cutting attachment must not rotate when the engine is idling.

Your machine is now ready for operation.

Shut off the engine.

N Move the Master Control lever in the

direction of STOP or † – when released, the Master Control lever springs back to the normal run position F.

Engine does not start in warm start position n.

N Move the Master Control lever to l

and continue cranking until the engine runs.

If the engine does not start

N Check that all settings are correct. N Check that there is fuel in the tank

and refuel if necessary.

N Check that the spark plug boot is

properly connected.

N Repeat the starting procedure.

Fuel tank run until completely dry N After refueling, press the fuel pump

bulb at least five times – even if the bulb is filled with fuel.

N Set the Master Control lever to suit

the engine temperature.

N Start the engine.

N Press down the throttle trigger

lockout and open the throttle – the Master Control lever moves to the

Other hints on starting

Engine stalls in cold start position l or under acceleration

N Move the Master Control lever to n

and continue cranking until the engine runs.

HS 46, HS 46 C, HS 56 C

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0008BA014 KN

Operating Instructions Cleaning the Air Filter

During break-in period

A factory-new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.

During Operation

After a long period of full throttle operation, allow the engine to run for a short while at idle speed so that engine heat can be dissipated by the flow of cooling air. This protects enginemounted components (ignition, carburetor) from thermal overload.

After Finishing Work

Storing for a short period: Wait for the engine to cool down. Empty the fuel tank and keep the machine in a dry place, well away from sources of ignition, until you need it again. For longer out-ofservice periods – see "Storing the Machine".

If there is a noticeable loss of engine power

N Loosen the captive screw (1) and

remove the filter cover (2).

N Clean away loose dirt from around

the filter.

N Remove the filter element (3). N Fit a new filter element. As a

temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not wash.

N Replace any damaged parts. N Fit the filter element (3). N Fit the filter cover (2) and screw it

down firmly.

Engine Management

Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware.

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0008BA016 KN

L H

Adjusting the Carburetor

General Information

The carburetor comes from the factory with a standard setting.

This setting provides an optimum fuel-air mixture under most operating conditions.

Standard Setting

N Shut off the engine. N Inspect cutting blades and clean if

necessary (clean, move freely, not warped).

N Check the air filter and clean or

replace if necessary.

N Check the spark arresting screen

(not in all models, country-specific) in the muffler and clean or replace if necessary.

Adjusting Idle Speed

N Carry out the standard setting. N Start and warm up the engine.

Engine stops while idling N Turn the idle speed screw (LA)

clockwise until the cutting blades begin to run – then back it off about 1 full turn.

Cutting blades run when engine is idling N Turn the idle speed screw (LA)

counterclockwise until the cutting blades stop moving – then turn it another 1 full turn in the same direction.

WARNING

If the cutting blades continue moving when the engine is idling, have your hedge trimmer checked and repaired by your servicing dealer.

Erratic idling behavior, poor acceleration (despite correction to setting of LA screw).

Idle setting is too lean N Rotate the low speed screw (L)

about 1/4 turn counterclockwise, no further than stop, until the engine runs and accelerates smoothly.

It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).

Fine Tuning for Operation at High Altitude

A slight correction of the setting may be necessary if engine does not run satisfactorily:

N Carry out the standard setting. N Warm up the engine. N Turn high speed screw (H) slightly

clockwise (leaner) – no further than stop.

NOTICE After returning from high altitude, reset

the carburetor to the standard setting. If the setting is too lean there is a risk of

engine damage due to insufficient lubrication and overheating.

N Turn high speed screw (H)

counterclockwise as far as stop (no more than 3/4 turn).

N Turn the low speed screw (L)

carefully clockwise as far as stop, then turn it back 3/4 turn.

Machine stops when it is swung at idle speed

Idle setting is too rich N Rotate the low speed screw (L)

about 1/4 turn clockwise until the engine idles smoothly.

HS 46, HS 46 C, HS 56 C

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0008BA015 KN

0008BA017 KN

0008BA018 KN

000BA039 KN

Spark Arresting Screen in Muffler

In some countries the muffler is equipped with a spark arresting screen.

N If the engine is down on power or

maximum speed is irregular, check the spark arresting screen in the muffler.

WARNING

Wait for the engine to cool down completely before performing this work.

N Use a 15 mm socket wrench to

unscrew the spark arresting screen.

N Clean the spark arresting screen. If

the screen is damaged or heavily carbonized, fit a new one.

N Refit the spark arresting screen and

tighten it down firmly.

Checking the Spark Plug

If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.

Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded.

Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.

Removing the Spark Plug

N Stopping the Engine

N Carefully pry open the flap (1) with a

suitable tool (e.g. combination wrench).

N Remove the spark plug boot (2)

using a suitable tool (e.g. combination wrench).

N Unscrew the spark plug.

Checking the Spark Plug

N Clean dirty spark plug. N Check electrode gap (A) and

readjust if necessary – see "Specifications."

N Use only resistor type spark plugs of

the approved range.

Rectify problems that have caused fouling of spark plug:

– too much oil in fuel mix, – dirty air filter, – unfavorable running conditions, e.g.

operating at part load.

HS 46, HS 46 C, HS 56 C

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000BA071 KN

0008BA019 KN

0008BA020 KN

0008BA021 KN

N Close the flap (1), top first, then the

bottom, tabs (arrows) must snap into position.

Lubricating the Gearbox

Commercial usage only – check every 25 hours of operation

Use STIHL gear lubricant for hedgetrimmers (special accessory) to lubricate the blade drive gear.

WARNING

To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (1) snugly onto spark plug terminal (2) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be securely 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.

Installing the Spark Plug

N Insert and screw home the spark

plug by hand.

N Tighten down the spark plug. N Press the spark plug boot firmly

onto the spark plug.

N Remove the screws (1) from the

underside of the unit.

N Remove the retaining plate (2) and

gearbox cover (3).

N Squeeze grease into the gearbox

housing (arrow) between the cam (4) and cutting blade (5) a little at a time (max.1/4 oz (5 g)) while turning the drive pinion (6) with an hex key wrench to distribute the grease evenly – avoid contact with the cutting blades.

HS 46, HS 46 C, HS 56 C

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0008BA022 KN

NOTICE Do not completely fill the gearbox with

grease.

N Fit the retaining plate (2) so that it is

flush with the gearbox housing.

N Fit the gearbox cover (3), insert the

screws (1) and tighten them down firmly.

Rewind Starter Storing the Machine

To help prolong the wear life of the starter rope, observe the following points:

N Pull the starter rope only in the

direction specified.

N Do not pull the rope over the edge of

the guide bushing.

N Do not pull out the rope more than

specified.

N Do not allow the starter grip to snap

back, guide it back into the housing slowly – see chapter on "Starting / Stopping the Engine."

Have a damaged starter rope replaced by your dealer before it breaks completely. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

For periods of 3 months or longer N Clean the cutting blades, check

condition and spray them with STIHL resin solvent.

N Drain and clean the fuel tank in a

well ventilated area.

N Dispose of fuel properly in

accordance with local environmental requirements.

N Run the engine until the carburetor

is dry – this helps prevent the carburetor diaphragms sticking together.

N Fit the blade scabbard. N Thoroughly clean the machine – pay

special attention to the cylinder fins and air filter.

N Store the machine in a dry and safe

location (use the ring integrated in the rear handle) – out of the reach of children and other unauthorized persons.

HS 46, HS 46 C, HS 56 C

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