Husqvarna T425 User Manual

GB (2-37)

DE (38-75)

FR (76-111)

NL (112-147)

ES (148-183)

PT (184-219)

IT (220-255) RU (256-295) GR (296-332)

KEY TO SYMBOLS

Symbols on the machine:

WARNING! Chain saws can be dangerous! Careless or incorrect use can result in serious or fatal injury to the operator or others.

Please read the operator’s manual carefully and make sure you understand the instructions before using the machine.

Always wear:

• Approved protective helmet

• Approved hearing protection

• Protective goggles or a visor This product is in accordance with

applicable EC directives.

Noise emission to the environment according to the European Community’s Directive. The machine’s emission is speciﬁed in chapter Technical data and on label.

Never let the guide bar tip come in contact with any object.

WARNING! Kickback may occur when the nose or tip of the guide bar touches an object, and cause a lightning fast reverse reaction, kicking the guide bar up and towards the operator. May cause serious personal injury.

This saw should only be used by persons who are specially trained in tree maintenance work. See operator’s manual!

Symbols in the operator’s manual:

Switch off the engine by moving the stop switch to the STOP position before carrying out any checks or maintenance.

Working position

Choke

Always wear approved protective gloves.

Regular cleaning is required.

Visual check.

Protective goggles or a visor must be worn.

Refuelling.

Other symbols/decals on the machine refer to special certiﬁcation requirements for certain markets.

2 – English

Filling with oil and adjusting oil ﬂow.

The chain brake must be engaged when the chain saw is started.

CONTENTS

Contents

KEY TO SYMBOLS

Symbols on the machine: 2 Symbols in the operator’s manual: 2

CONTENTS

Contents 3

INTRODUCTION

Dear Customer, 4

WHAT IS WHAT?

What is what on the chain saw? 5

GENERAL SAFETY PRECAUTIONS

Before using a new chain saw 6 Important 6 Always use common sense 6 Personal protective equipment 7 Machine

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s safety equipment 7

Cutting equipment 10

ASSEMBLY

Fitting the bar and chain 16

FUEL HANDLING

Fuel 17 Fuelling 18 Fuel safety 18

STARTING AND STOPPING

Starting and stopping 19

WORKING TECHNIQUES

Before use: 21 General working instructions 21 How to avoid kickback 28

MAINTENANCE

General 29 Carburettor adjustment 29 Checking, maintaining and servicing chain saw

safety equipment 30 Mufﬂer 31 Starter 32 Air ﬁlter 33 Spark plug 33 Lubricating the bar tip sprocket 33 Adjustment of the oil pump 34 Cooling system 34 Maintenance schedule 35

TECHNICAL DATA

Technical data 36 Bar and chain combinations 37 Saw chain ﬁling and ﬁle gauges 37 EC-declaration of conformity 37

English

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INTRODUCTION

Dear Customer,

Congratulations on your choice to buy a Husqvarna product! Husqvarna is based on a tradition that dates back to 1689, when the Swedish King Karl XI ordered the construction of a factory on the banks of the Husqvarna River, for production of muskets. The location was logical, since water power was harnessed from the Huskvarna River to create the waterpowered plant. During the more than 300 years of beeing, the Husqv arna factory has produced a lot of different products, from wood stoves to modern kitchen appliances, sewing machines, bicycles, motorcycles etc. In 1956, the ﬁrst motor driven lawn mowers appeared, followed by chain saws in 1959, and it is within this area Husqvarna is working today.

Today Husqvarna is one of the leading manufacturers in the world of forest and garden products, with quality as our highest priority. The business concept is to develop, manufacture and market motor driven products for forestry and gardening as well as for building and construction industry. Husqv arna ergonomics, usability, security and environmental protection. That is the reason why we have developed many different features to provide our products within these areas.

We are convinced that you will appreciate with great satisfaction the quality and performance of our product for a very long time to come. The purchase of one of our products gives you access to professional help with repairs and service whenever this may be necessary. If the retailer who sells your machine is not one of our authorised dealers, ask for the address of your nearest service workshop.

It is our wish that you will be satisﬁed with your product and that it will be your companion for a long time. Think of this operator

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s manual as a valuable document. By following its the second-hand value of the machine can be extended. If you will sell this machine, make sure that the buyer will get the operator

Thank you for using a Husqvarna product.

Husqvarna AB has a policy of continuous product development and therefore reserves the right to modify the design and appearance of products without prior notice.

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s manual.

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content (using, service, maintenance etc) the life span and

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s aim is also to be in the front edge according to

4 – English

WHAT IS WHAT?

What is what on the chain saw?

1 Filter cover 2 Adjuster screws carburettor 3 Starter 4 Fuel tank 5 Chain oil tank 6 Ignition; choke: 7 Spike bumper 8 Front hand guard 9 Information and warning decal 10 Stop switch 11 Air purge 12 Top handle 13 Fixing eye for safety line 14 Spark plug cap 15 Starter handle

16 Front handle 17 Oil pump adjustment screw 18 Throttle lockout 19 Throttle control 20 Bar 21 Chain 22 Bar tip sprocket 23 Chain catcher 24 Chain tensioning screw 25 Product and serial number plate 26 Clutch cover with built-in chain brake. 27 Mufﬂer 28 Bar guard 29 Combination spanner 30 Operator

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s manual

English – 5

GENERAL SAFETY PRECAUTIONS

Before using a new chain saw

• Please read this manual carefully.

• Check that the cutting equipment is correctly ﬁtted and

adjusted. See instructions under the heading Assembly.

• Refuel and start the chain saw. See the instructions

under the headings Fuel Handling and Starting and Stopping.

• Do not use the chain saw until sufﬁcient chain oil has

reached the chain. See instructions under the heading Lubricating cutting equipment.

• Long-term exposure to noise can result in permanent

hearing impairment. So always use approv ed hearing protection.

WARNING! Under no circumstances ma y the design of the machine be modiﬁed

without the permission of the manufacturer. Always use genuine accessories. Non-authorized modiﬁcations and/or accessories can result in serious personal injury or the death of the operator or others.

WARNING! A chain saw is a dangerous tool if used carelessly or incorrectly and

can cause serious, even fatal injuries. It is very important that you read and understand the contents of this operator’s manual.

WARNING! The inside of the mufﬂer contain chemicals that may be

carcinogenic. Avoid contact with these elements in the event of a damaged mufﬂer.

WARNING! Long term inhalation of the engine’s exhaust fumes, chain oil mist

and dust from sawdust can represent a health risk.

Important

IMPORTANT! The machine is only designed for cutting wood. You should only use the saw with the bar and chain

combinations we recommend in the chapter Technical data.

Never use the machine if you are fatigued, while under the inﬂuence of alcohol or drugs, medication or anything that could affect your vision, alertness, coordination or judgement.

Wear personal protective equipment. See instructions under the heading Personal protective equipment.

Do not modify this product or use it if it appears to have been modiﬁed by others.

Never use a machine that is faulty. Carry out the checks, maintenance and service instructions described in this manual. Some maintenance and service measures must be carried out by trained and qualiﬁed specialists. See instructions under the heading Maintenance.

Never use any accessories other than those recommended in this manual. See instructions under the headings Cutting equipment and Technical data.

CAUTION! Always wear protective glasses or a face visor to reduce the risk of injury from thrown objects. A chain saw is capable of throwing objects, such as wood chips, small pieces of wood, etc, at great force. This can result in serious injury, especially to the eyes.

WARNING! Running an engine in a conﬁned or badly ventilated area can result in death due to asphyxiation or carbon monoxide poisoning.

WARNING! Faulty cutting equipment or the wrong combination of bar and saw chain increases the risk of kickback! Only use the bar/saw chain combinations we recommend, and follow the ﬁling instructions. See instructions under the heading Technical data.

6 – English

WARNING! The ignition system of this machine produces an electromagnetic

ﬁeld during operation. This ﬁeld may under some circumstances interfere with pacemakers. To reduce the risk of serious or fatal injury, we recommend persons with pacemakers to consult their physician and the pacemaker manufacturer before operating this machine.

Always use common sense

It is not possible to cover every conceivable situation you can face when using a chain saw. Always exercise care and use your common sense. Avoid all situations which you consider to be beyond your capability. If you still feel uncertain about operating procedures after reading these instructions, you should consult an expert before continuing. Do not hesitate to contact your dealer or us if you have any questions about the use of the chain saw. We will willingly be of service and provide you with advice as well as help you to use your chain saw both efﬁciently and safely. Attend a tr aining course in chain sa w usage if possible. Your dealer, forestry school or your library can

GENERAL SAFETY PRECAUTIONS

provide information about which training materials and courses are available.

Work is constantly in progress to improve the design and technology - improvements that increase your safety and efﬁciency. Visit your dealer regularly to see whether you can beneﬁt from new features that have been introduced.

Personal protective equipment

WARNING! Most chain saw accidents happen when the chain touches the

operator. You must use approved personal protective equipment whenever you use the machine. Per sonal protective equipment cannot eliminate the risk of injury but it will reduce the degree of injury if an accident does happen. Ask your dealer for help in choosing the right equipment.

CAUTION! Nev er use a chain saw b y holding it with one hand. A chain saw is not saf ely controlled with one hand; you can cut yourself. Always have a secure, ﬁrm grip around the handles with both hands.

• Approved protective helmet

• Hearing protection

• Protective goggles or a visor

• Gloves with saw protection

• Trousers with saw protection

• Boots with saw protection, steel toe-cap and non-slip sole

• Always have a ﬁrst aid kit nearby.

• Fire Extinguisher and Shovel

Generally clothes should be close-ﬁtting without restricting your freedom of movement.

IMPORT ANT! Sparks can come from the mufﬂer , the bar and chain or other sources. Always have ﬁre extinguishing tools available if you should need them. Help prevent forest ﬁres.

This top handle chainsaw is designed speciﬁcally for tree surgery and maintenance in the tree. Due to the special compact handle design (closely spaced handles), there is an increased risk of losing control. For this reason these special chainsaws should be used only for work in a tree by persons who are trained in special cutting and working techniques and who are properly secured (lift bucket, ropes, safety harness). Regular chainsaws (with wider spaced handles) are recommended for all other cutting work at ground level.

WARNING! W orking in a tree requires the use of special cutting and working techniques which must be observed in order to reduce the increased risk of personal injury. Never work in a tree unless you have received speciﬁc, professional training for such work, including training in the use of safety and other climbing equipment, such as harnesses, ropes, belts, climbing irons, snap hooks, carabiners, etc.

Machine

In this section the machine’s safety features and their function are explained. For inspection and maintenance see instructions under the heading Checking, maintaining and servicing chain saw safety equipment. See instructions under the heading, What is what?, to ﬁnd where these parts are located on your machine.

The life span of the machine can be reduced and the risk of accidents can increase if machine maintenance is not carried out correctly and if service and/or repairs are not carried out professionally. If you need further information please contact your nearest service workshop.

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ety equipment

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s saf

WARNING! Never use a machine with defective safety components. Safety equipment must be inspected and maintained. See instructions under the heading Checking, maintaining and servicing chain saw safety equipment. If your machine does not pass all the checks, take the saw to a servicing dealer for repair.

English

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GENERAL SAFETY PRECAUTIONS

Chain brake and front hand guard

Your chain saw is equipped with a chain brake that is designed to stop the chain if you get a kickback. The chain brake reduces the risk of accidents, but only you can prevent them.

Take care when using your saw and make sure the kickback zone of the bar never touches any object.

• The chain brake (A) can either be activated manually (by your left hand) or automatically by the inertia release mechanism.

• The brake is applied when the front hand guard (B) is pushed forwards.

• The chain brake must be engaged when the chain saw is started to prevent the saw chain from rotating.

• Use the chain brake as a ”parking brake” when starting and when moving over short distances, to reduce the risk of moving chain accidentally hitting your leg or anyone or anything close by.

• To release the chain brake pull the front hand guard backwards, towards the front handle.

• This movement activates a spring-loaded mechanism that tightens the brake band (C) around the engine drive system (D) (clutch drum).

• The front hand guard is not designed solely to activate the chain brake. Another important feature is that it reduces the risk of your left hand hitting the chain if you lose grip of the front handle.

8 – English

• Kickback can be very sudden and violent. Most kickbacks are minor and do not always activate the chain brake. If this happens you should hold the chain saw ﬁrmly and not let go.

• The way the chain brake is activ ated, either manually or automatically by the inertia release mechanism, depends on the force of the kickback and the position of the chain saw in relation to the object that the kickback zone of the bar strikes.

If you get a violent kickback while the kickbac k zone of the bar is farthest away from you the chain brake is designed to be activated by the inertia in the kickback direction.

GENERAL SAFETY PRECAUTIONS

If the kickback is less violent or the kickback zone of the bar is closer to you the chain brake will be activated manually by the movement of y our left hand.

• In the felling position the left hand is in a position that makes manual activation of the chain brake impossible. With this type of grip, that is when the left hand is placed so that it cannot affect the movement of the front hand guard, the chain brake can only be activated by the inertia action.

Will my hand always activate the chain brake during a kickback?

No. It takes a certain force to move the hand guard forward. If your hand only lightly touches the front guard or slips over it, the force may not be enough to trigger the chain brake. You should also maintain a ﬁrm grip of the chain saw handles while working. If you do and experience a kickback, your hand may never leave the front handle and will not activate the chain brake, or the chain brake will only activate after the saw has swung around a considerable distance. In such instances, the chain brake might not hav e enough time to stop the saw chain before it touches you.

There are also certain positions in which your hand cannot reach the front hand guard to activate the chain brake; f or example, when the saw chain is held in felling position.

Will my inetria activated chain brake always activate during kickback in the event of a kickback?

No. First your brak e must be in working order . Second the kickback must be strong enough to activate the chain brake. If the chain brake is too sensitive it would activate all the time which would be a nuisance.

Will my chain brake always protect me from injury in the event of a kickback?

No. First, the chain brake must be in working order to provide the intended protection. Second, it must be activated during the kickback as described above to stop the saw chain. Third, the chain brake ma y be activated b ut if the bar is too close to you the brake might not have enough time to slow down and stop the chain before the chain saw hits you.

Only you and proper working technique can eliminate kickback and its danger.

Throttle lockout

The throttle lockout is designed to prevent accidental operation of the throttle control. When you press the lock (A) (i.e. when you g rasp the handle) it releases the throttle control (B). When you release the handle the throttle control and the throttle lockout both move back to their original positions. This arrangement means that the throttle control is automatically locked at the idle setting.

Chain catcher

The chain catcher is designed to catch the chain if it snaps or jumps off. This should not happen if the chain is properly tensioned (see instructions under the heading Assembly) and if the bar and chain are properly serviced and maintained (see instructions under the heading General working instructions).

Vibration damping system

Your machine is equipped with a vibration damping system that is designed to minimize vibration and make operation easier.

The machine transfer of vibration between the engine unit/cutting equipment and the machine chain saw, including the cutting equipment, is insulated from the handles by vibration damping units.

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s vibration damping system reduces the

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s handle unit. The body of the

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GENERAL SAFETY PRECAUTIONS

Cutting hardwoods (most broadleaf trees) creates more vibration than cutting softwoods (most conifers). Cutting with cutting equipment that is blunt or faulty (wrong type or badly sharpened) will increase the vibration level.

WARNING! Overexposure to vibration can lead to circulatory damage or nerve

damage in people who have impaired circulation. Contact your doctor if you experience symptoms of overexposure to vibration. Such symptoms include numbness, loss of feeling, tingling, pricking, pain, loss of strength, changes in skin colour or condition. These symptoms normally appear in the ﬁngers, hands or wrists. These symptoms may be increased in cold temperatures.

Stop switch

Use the stop switch to switch off the engine.

Mufﬂer

The mufﬂer is designed to keep noise levels to a minimum and to direct exhaust fumes away from the user.

In areas with a hot, dry climate there is a high risk of ﬁres.

WARNING! The exhaust fumes from the engine are hot and may contain sparks

which can start a ﬁre. Never start the machine indoors or near combustible material!

CAUTION! The mufﬂer gets very hot during and after use. This also applies during idling. Be aw are of the ﬁre hazard, especially when working near ﬂammable substances and/or vapours.

•

Cutting equipment

This section describes how to choose and maintain your cutting equipment in order to:

• Reduce the risk of kickback.

• Reduce the risk of the saw chain breaking or jumping off the bar.

• Obtain optimal cutting performance.

• Extend the life of cutting equipment.

• Avoid increasing vibration levels.

General rules

Only use cutting equipment recommended by us!

See instructions under the heading Technical data.

• Keep the chain’s cutting teeth properly

sharpened! Follow our instructions and use the recommended ﬁle gauge. A damaged or badly

sharpened chain increases the risk of accidents.

• Maintain the correct depth gauge setting! Follow

our instructions and use the recommended depth gauge clearance. Too large a clearance increases

the risk of kickback.

• Keep the chain properly tensioned! If the chain is slack it is more likely to jump off and lead to increased wear on the bar, chain and drive sprocket.

• Keep cutting equipment well lubricated and

properly maintained! A poorly lubricated chain is

more likely to break and lead to increased wear on the bar, chain and drive sprocket.

10 – English

WARNING! Never use a saw without a mufﬂer, or with a damaged mufﬂer. A damaged mufﬂer may substantially increase the noise level and the ﬁre hazard. Keep ﬁre ﬁghting equipment handy.

GENERAL SAFETY PRECAUTIONS

Cutting equipment designed to reduce kickback

WARNING! Faulty cutting equipment or the wrong combination of bar and saw

chain increases the risk of kickback! Only use the bar/saw chain combinations we recommend, and follow the ﬁling instructions. See instructions under the heading Technical data.

The only way to avoid kickback is to make sure that the kickback zone of the bar never touches anything.

By using cutting equipment with ”built-in” kickback reduction and keeping the chain sharp and wellmaintained you can reduce the effects of kickback.

Bar

The smaller the tip radius the lower the chance of kickback.

Chain

A chain is made up of a number of links, which are available in standard and low-kickback versions.

IMPORTANT! No saw chain design eliminates the danger of kickback.

WARNING! Any contact with a rotating saw chain can cause extremely serious

injuries.

• Number of drive links. The number of drive links is determined by the length of the bar, the chain pitch and the number of teeth on the bar tip sprocket.

• Bar groove width (inches/mm). The groove in the bar must match the width of the chain drive links.

• Chain oil hole and hole for chain tensioner. The bar must be matched to the chain saw design.

Chain

• Chain pitch (inches)

• Drive link width (mm/inches)

Some terms that describe the bar and chain

To maintain the safety features of the cutting equipment, you should replace a worn or damaged bar or chain with a bar and chain combinations recommended by Husqvarna. See instructions under the heading Technical Data for a list of replacement bar and chain combinations we recommend.

Bar

• Length (inches/cm)

• Number of teeth on bar tip sprocket (T).

• Chain pitch (inches). The spacing between the drive links of the chain must match the spacing of the teeth on the bar tip sprocket and drive sprocket.

• Number of drive links.

Sharpening your chain and adjusting depth gauge setting

General information on sharpening cutting teeth

• Never use a blunt chain. When the chain is blunt you have to exert more pressure to force the bar through the wood and the chips will be very small. If the chain is very blunt it will produce wood powder and no chips or shavings.

• A sharp chain eats its way through the wood and produces long, thick chips or shavings.

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GENERAL SAFETY PRECAUTIONS

• The cutting part of the chain is called the cutter and consists of a cutting tooth (A) and the depth gauge (B). The cutters cutting depth is determined by the difference in height between the two (depth gauge setting).

When you sharpen a cutting tooth there are four important factors to remember.

1 Filing angle

Sharpening cutting teeth

To sharpen cutting teeth you will need a round ﬁle and a ﬁle gauge. See instructions under the heading Technical data for information on the size of ﬁle and gauge that are recommended for the chain ﬁtted to your chain saw.

• Check that the chain is correctly tensioned. A slack chain will move sideways, making it more difﬁcult to sharpen correctly.

2 Cutting angle

3 File position

4 Round ﬁle diameter

It is very difﬁcult to sharpen a chain correctly without the right equipment. We recommend that you use our ﬁle gauge. This will help you obtain the maximum kickback reduction and cutting performance from your chain.

See instructions under the heading Technical data for information about sharpening your chain.

WARNING! Departure from the sharpening instructions considerably

increases the risk of kickback.

• Always ﬁle cutting teeth from the inside face. Reduce the pressure on the return stroke. File all the teeth on one side ﬁrst, then turn the chain saw over and ﬁle the teeth on the other side.

• File all the teeth to the same length. When the length of the cutting teeth is reduced to 4 mm (0.16") the chain is worn out and should be replaced.

General advice on adjusting depth gauge setting

• When you sharpen the cutting tooth (A) the depth gauge setting (C) will decrease. To maintain optimal cutting performance the depth gauge (B) has to be ﬁled down to achieve the recommended depth gauge setting. See instructions under the heading Technical data to ﬁnd the correct depth gauge setting for your particular chain.

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WARNING! The risk of kickback is increased if the depth gauge setting is too large!

GENERAL SAFETY PRECAUTIONS

Adjustment of depth gauge setting

• The cutting teeth should be newly sharpened before adjusting the depth gauge setting. We recommend that you adjust the depth gauge setting every third time you sharpen the cutting teeth. NOTE! This recommendation assumes that the length of the cutting teeth is not reduced excessively.

• You will need a ﬂat ﬁle and a depth gauge tool. We recommend that you use our depth gauge tool to acheive the correct depth gauge setting and bevel f or the depth gauge.

• Place the depth gauge tool over the chain. Detailed information regarding the use of the depth gauge tool, will be found on the package for the depth gauge tool. Use the ﬂat ﬁle to ﬁle off the tip of the depth gauge that protrudes through the depth gauge tool. The depth gauge setting is correct when you no longer feel resistance as you draw the ﬁle along the depth gauge tool.

Tensioning the chain

WARNING! A slack chain may jump off and cause serious or even fatal injury.

The more you use a chain the longer it becomes. It is therefore important to adjust the chain regularly to take up the slack.

Check the chain tension every time you refuel. NOTE! A new chain has a running-in period during which you should check the tension more frequently.

Tension the chain as tightly as possible, but not so tight that you cannot pull it round freely by hand.

• Loosen the bar nut that holds the clutch cover and chain brake. Use the combination spanner.

• Raise the tip of the bar and stretch the chain by tightening the chain tensioning screw using the combination spanner. Tighten the chain until it does not sag from the underside of the bar.

• Use the combination spanner to tighten the bar nut while holding up the tip of the bar. Chec k that you can pull the saw chain round freely by hand, and that there is no slack on the underside of the bar.

The position of the chain tensioning screw on our chain saws varies from model to model. See instructions under the heading What is what? to ﬁnd out where it is on your model.

Lubricating cutting equipment

WARNING! Poor lubrication of cutting equipment may cause the chain to snap, which could lead to serious, even fatal injuries.

Chain oil

Chain oil must demonstrate good adhesion to the chain and also maintain its ﬂow characteristics regardless of whether it is warm summer or cold winter weather.

As a chain saw manufacturer we have developed an optimal chain oil which, with its vegetable oil base, is also biodegradable. We recommend the use of our o wn oil for both maximum chain life and to minimise environmental damage. If our own chain oil is not available, standard chain oil is recommended.

Never use waste oil! Using waste oil can be dangerous to you and damage the machine and environment.

IMPORTANT! When using vegetable based saw chain oil, dismantle and clean the groove in the bar and saw chain before long-term storage. Otherwise there is a risk of the saw chain oil oxidizing, which will result in the saw chain becoming stiff and the bar tip sprocket jamming.

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GENERAL SAFETY PRECAUTIONS

Filling with chain oil

• All our chain saws have an automatic chain lubrication system. On some models the oil ﬂow is also adjustable.

• The saw chain oil tank and the fuel tank are designed so that the fuel runs out before the saw chain oil.

However, this safety feature requires that y ou use the right sort of chain oil (if the oil is too thin it will run out before the fuel), and that you adjust the carburetor as recommended (a lean mixture may mean that the fuel lasts longer than the oil) and that you also use the recommended cutting equipment (a bar that is too long will use more chain oil).

Checking chain lubrication

• Check the chain lubrication each time you refuel. See instructions under the heading Lubricating the bar tip sprocket.

Aim the tip of the bar at a light coloured surface about 20 cm (8 inches) away. After 1 minute running at 3/4 throttle you should see a distinct line of oil on the light surface.

• Check that the groove in the edge of the bar is clean. Clean if necessary.

• Check that the bar tip sprocket turns freely and that the lubricating hole in the tip sprocket is not blocked. Clean and lubricate if necessary.

If the chain lubrication system is still not working after carrying out the above checks and associated measures you should contact your service agent.

Chain drive sprocket

The clutch drum is ﬁtted with following drive sprockets: A Spur sprocket (the chain sprocket is welded on the

drum)

If the chain lubrication is not working:

• Check that the oil channel in the bar is not obstructed. Clean if necessary.

14 – English

Regularly check the degree of wear on the drive sprocket. Replace if wear is excessive. Replace the drive sprocket whenever you replace the chain.

GENERAL SAFETY PRECAUTIONS

Checking wear on cutting equipment

Check the chain daily for:

• Visible cracks in rivets and links.

• Whether the chain is stiff.

• Whether rivets and links are badly worn. Replace the saw chain if it exhibits any of the points

above. We recommend you compare the existing chain with a

new chain to decide how badly the existing chain is worn. When the length of the cutting teeth has worn down to

only 4 mm the chain must be replaced.

Bar

Check regularly:

• Whether there are burrs on the edges of the bar. Remove these with a ﬁle if necessary.

• Whether the groove in the bar has become badly worn. Replace the bar if necessary.

• Whether the tip of the bar is uneven or badly worn. If a hollow forms on the underside of the bar tip this is due to running with a slack chain.

• To prolong the life of the bar you should turn it over daily.

WARNING! Most chain saw accidents happen when the chain touches the operator.

Wear personal protective equipment. See instructions under the heading Personal protective equipment.

Do not tackle any job that you feel you are not adequately trained for. See instructions under the headings Personal protective equipment, How to avoid kickback, Cutting equipment and General working instructions.

Avoid situations where there is a risk of kickback. See instructions under the heading Machine′′′′s safety equipment.

Use the recommended protective equipment and check its condition. See instructions under the headings Technical data and General safety precautions.

Check that all the chain saw safety features are working. See instructions under the headings General working instructions and General safety precautions.

Never use a chain saw by holding it with one hand. A chain saw is not safely controlled with one hand. Always have a secure, ﬁrm grip around the handles with both hands.

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ASSEMBLY

Fitting the bar and chain

WARNING! Always wear gloves, when working with the chain.

Check that the chain brake is in disengaged position by moving the front hand guard towards the front handle.

Unscrew the bar nut and remove the clutch cover (chain brake). Take off the transportation guard.

Fit the bar over the bar bolts. Place the bar in its rearmost position. Place the chain over the drive sprocket locate it in the groove on the bar . Begin on the top edge of the bar.

hand. Hold up the bar tip and tighten the bar nuts with the combination spanner.

When ﬁtting a new chain, the chain tension has to be checked frequently until the chain is run-in. Check the chain tension regularly. A correctly tensioned chain ensures good cutting performance and long life.

Fitting a spike bumper

Spike bumper is an option. To ﬁt a spike bumper – contact your service agent.

Make sure that the edges of the cutting links are facing forward on the top edge of the bar.

Fit the clutch cover and locate the chain adjuster pin in the hole in the bar. Check that the drive links of the chain ﬁt correctly over the drive sprocket and that the chain is correctly located in the groove in the bar. Tighten the bar nuts ﬁnger tight.

Tension the chain by turning the chain tensioning screw clockwise using the combination spanner. The chain should be tensioned until it does not sag from the underside of the bar. See instructions under the heading Tensioning the chain.

The chain is correctly tensioned when it does not sag from the underside of the bar, but can still be turned easily by

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FUEL HANDLING

Fuel

Note! The machine is equipped with a two-stroke engine and must always be run using a mixture of petrol and twostroke oil. It is important to accurately measure the amount of oil to be mixed to ensure that the correct mixture is obtained. When mixing small amounts of fuel, even small inaccuracies can drastically affect the ratio of the mixture.

WARNING! Always ensure there is adequate ventilation when handling fuel.

Petrol

• Use good quality unleaded or leaded petrol.

• CAUTION! Engines equipped with catalytic

converters must be run on unleaded fuel mixtures.

• Leaded gasoline will destroy the catalytic converter and it will no longer serve its purpose. The g reen fuel cap on saws ﬁtted with catalytic converters means that only unleaded gasoline can be used.

• The lowest recommended octane grade is 90 (RON). If you run the engine on a lower octane grade than 90 so-called knocking can occur. This giv es rise to a high engine temperature and increased bearing load, which can result in serious engine damage.

• When working with continuous high revs (e.g. limbing) a higher octane is recommended.

Environment fuel

HUSQVARNA recommends the use of alkylate fuel, either Aspen two-stroke fuel or environmental fuel for f our-stroke engines blended with two-stroke oil as set out below . Note that carburettor adjustment may be necessary when changing the type of fuel (see the instructions under the heading Carburettor).

Running-in

Avoid running at a too high speed for extended periods during the ﬁrst 10 hours.

Two-stroke oil

• For best results and performance use HUSQVARNA two-stroke engine oil, which is specially formulated for our air-cooled two-stroke engines.

• Never use two-stroke oil intended for water-cooled engines, sometimes referred to as outboard oil (rated TCW).

• Never use oil intended for four-stroke engines.

• A poor oil quality and/or too high oil/fuel ratio may jeopardise function and decrease the life time of catalytic converters.

Mixing ratio

1:50 (2%) with HUSQVARNA two-stroke oil or JASO FC or ISO EGC GRADE.

1:33 (3%) with oils class JASO FB or ISO EGB formulated for air-cooled, two-stroke engines.

Petrol, litre Two-stroke oil, litre

2% (1:50) 3% (1:33)

5 0,10 0,15 10 0,20 0,30 15 0,30 0,45 20 0,40 0,60

Mixing

• Always mix the petrol and oil in a clean container intended for fuel.

• Always start by ﬁlling half the amount of the petrol to be used. Then add the entire amount of oil. Mix (shak e) the fuel mixture. Add the remaining amount of petrol.

• Mix (shake) the fuel mixture thoroughly before ﬁlling the machine’s fuel tank.

• Do not mix more than one month’s supply of fuel at a time.

• If the machine is not used for some time the fuel tank should be emptied and cleaned.

Chain oil

• We recommend the use of special oil (chain oil) with good adhesion characteristics.

• Never use waste oil. This results in damage to the oil pump, the bar and the chain.

• It is important to use oil of the right grade (suitable viscosity range) to suit the air temperature.

• In temperatures below 0°C (32°F) some oils become too viscous. This can ov erload the oil pump and result in damage to the oil pump components.

• Contact your service agent when choosing chain oil.

English – 17

FUEL HANDLING

Fuelling

WARNING! Taking the following precautions, will lessen the risk of ﬁre:

Do not smoke and do not place any hot objects in the vicinity of fuel.

Always stop the engine and let it cool for a few minutes before refuelling.

When refuelling, open the fuel cap slowly so that any excess pressure is released gently.

Tighten the fuel cap carefully after refuelling.

Always move the machine awa y from the refuelling area before starting.

Clean the area around the fuel cap. Clean the fuel and chain oil tanks regularly. The fuel ﬁlter must be replaced at least once a year. Contamination in the tanks causes malfunction. Make sure the fuel is well mixed by shaking the container before refuelling. The capacities of the chain oil tank and fuel tank are carefully matched. You should therefore always ﬁll the chain oil tank and fuel tank at the same time.

WARNING! Fuel and fuel vapour are highly ﬂammable. Take care when

handling fuel and chain oil. Be aware of the risks of ﬁre, explosion and those associated with inhalation.

Fuel safety

• Never refuel the machine while the engine is running.

• Make sure there is plenty of ventilation when refuelling or mixing fuel (petrol and 2-stroke oil).

• Move the machine at least 3 m from the refuelling point before starting it.

• Never start the machine:

1 If you have spilt fuel or chain oil on the machine. Wipe

off the spillage and allow remaining fuel to evaporate.

2 If you have spilt fuel on yourself or your clothes,

change your clothes. Wash any part of your body that has come in contact with fuel. Use soap and water.

3 If the machine is leaking fuel. Check regularly for leaks

from the fuel cap and fuel lines.

WARNING! Never use a machine with visible damage to the spark plug guard and ignition cable. A risk of sparking arises, which can cause a ﬁre.

Transport and storage

• Always store the chain saw and fuel so that there is no risk of leakages or fumes coming into contact with sparks or naked ﬂames from electrical equipment, electric motors, relays/switches, boilers and the like.

• Always store fuel in an approved container designed for that purpose.

• For longer periods of storage or for transport of the chain saw, the fuel and chain oil tanks should be emptied. Ask where you can dispose of waste fuel and chain oil at your local petrol station.

• Ensure the machine is cleaned and that a complete service is carried out before long-term storage.

• The bar guard must always be ﬁtted to the cutting attachment when the machine is being transported or in storage, in order to prevent accident contact with the sharp chain. Even a non-moving chain can cause serious cuts to yourself or persons you bump into with an exposed chain.

Long-term storage

Empty the fuel/oil tanks in a well ventilated area. Store the fuel in approved cans in a safe place. Fit the bar guard. Clean the machine. See instructions under the heading Maintenance schedule.

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STARTING AND STOPPING

Starting and stopping

WARNING! Note the following before starting:

The chain brake must be engaged when the chain saw is started to reduce the chance of contact with the moving chain during starting.

Never start a chain saw unless the bar, chain and all covers are ﬁtted correctly. Otherwise the clutch can come loose and cause personal injuries.

Place the machine on ﬁrm ground. Make sure you have a secure footing and that the chain cannot touch anything.

If you need to start the chain saw in the tree, see instructions under the heading Starting the saw in the tree, under the section Working techniques.

Keep people and animals well away from the working area.

Cold engine

Starting: The chain brake must be engaged when the

chain saw is started. Activate the brake by moving the front hand guard forwards.

Ignition; choke: Pull the choke knob to the second-stage position. The choke will close and the throttle lever will then be set in the starting position.

Warm engine

Use the same starting procedure as for a cold engine.

Starting

Grip the front handle with your left hand and push the chain saw to the ground. Grip the starter handle with your right hand and pull out the starter cord slowly until you feel a resistance (as the starter pawls engage) and then pull ﬁrmly and rapidly. Never twist the starter cord around

your hand.

CAUTION! Do not pull the starter cord all the way out and do not let go of the starter handle when the cord is fully extended. This can damage the machine.

Set the switch to ”I” position.

Primer bulb: Press the air purge repeatedly until fuel begins to ﬁll the bulb. The bulb need not be completely ﬁlled.

Push in the choke control as soon as the engine ﬁres which can be heard through a "puff" sound. Keep on pulling the cord powerfully until the engine starts. When

English – 19

STARTING AND STOPPING

the engine starts, quickly apply full throttle; the throttle start lock will automatically disengage.

IMPORTANT! As the chain brake is still engaged the speed of the engine must be set to idling as soon as possible, this is achieved by quickly disengaging the throttle lock. This prevents unnecessary wear to the clutch, clutch drum and brake band.

Note! Reactivate the chain brake by pushing the front hand guard back towards the front handle. The chain sa w is now ready for use.

WARNING! Long term inhalation of the engine’s exhaust fumes, chain oil mist

and dust from sawdust can represent a health risk.

• Observe your surroundings and make sure that there is no risk of people or animals coming into contact with the cutting equipment.

• Always hold the saw with both hands. The right hand should be on the top handle, and the left hand on the front handle. All people, whether right or left handed, should use this grip. Use a ﬁrm grip with thumbs and ﬁngers encircling the chain saw handles.

Stopping

• Never start a chain saw unless the bar, chain and all covers are ﬁtted correctly. See instructions under the heading Assembly. Without a bar and chain attached to the chain saw the clutch can come loose and cause serious injury.

• The chain brake should be activated when starting. Se instructions under the heading Start and stop. Do not drop start. This method is very dangerous because you may lose control of the saw.

• Never start the machine indoors. Exhaust fumes can be dangerous if inhaled.

20 – English

The engine is stopped by pushing the stop switch to the stop position.

Before use:

WORKING TECHNIQUES

Basic safety rules

1 Look around you:

• T o ensure that people , animals or other things cannot affect your control of the machine.

• To make sure that none of the above might come within reach of your saw or be injured by falling trees.

1 Check that the chain brake works correctly and is not

damaged.

2 Check that the throttle lockout works correctly and is

not damaged.

3 Check that the stop switch works correctly and is not

damaged. 4 Check that all handles are free from oil. 5 Check that the anti vibration system works and is not

damaged. 6 Check that the mufﬂer is securely attached and not

damaged. 7 Check that all parts of the chain saw are tightened

correctly and that they are not damaged or missing. 8 Check that the chain catcher is in place and not

damaged. 9 Check the chain tension.

General working instructions

IMPORTANT! This section describes basic safety rules for using a

chain saw. This information is never a substitute for professional skills and experience. If you get into a situation where you feel unsafe, stop and seek expert advice. Contact your chain sa w dealer, service agent or an experienced chain saw user. Do not attempt an y task that you feel unsure of!

Before using a chain saw you must understand the effects of kickback and how to avoid them. See instructions under the heading How to avoid kickback.

Before using a chain saw you must understand the difference between cutting with the top and bottom edges of the bar. See instructions under the headings How to avoid kickbac k and Machine’ s saf ety equipment.

CAUTION! Follow the instructions abov e, but do not use a chain saw in a situation where you cannot call for help in case of an accident.

2 All tree maintenance work above ground lev el must be

carried out by two or more persons with the right training (see instructions under the heading Important). At least one person should be on the ground to carry out safe rescue procedures and/or get help should an emergency arise.

3 During tree maintenance work above ground level, the

working area should always be secured and marked out with signs, tape or the like. The person(s) on the ground should always inform the person(s) working above before they enter the secure working area.

4 Do not use the machine in bad weather, such as

dense fog, heavy rain, strong wind, intense cold, etc. Working in bad weather is tiring and often brings added risks, such as icy ground, unpredictable felling direction, etc.

5 Take great care when removing small branches and

avoid cutting bushes (i.e. cutting many small branches at the same time). Small branches can be grab bed by the chain and thrown back at you, causing serious injury.

During tree maintenance work above ground level the chain saw must be secured. Secure the chain saw by attaching a safety line to the ﬁxing eye on the chain saw.

Wear personal protective equipment. See instructions under the heading Personal protective equipment.

English – 21

WORKING TECHNIQUES

6 Make sure you can move and stand saf ely. Check the

area around you for possible obstacles (roots, rocks, branches, ditches, etc.) in case you have to move suddenly. Take great care when working on sloping ground.

7 Take great care when cutting a tree that is in tension.

A tree that is in tension may spring back to its normal position before or after being cut. If you position yourself incorrectly or make the cut in the wrong place the tree may hit you or the machine and cause you to lose control. Both situations can cause serious personal injury.

effect of kickback and lets you keep the chain saw under control.

3 Most kickback accidents happen during limbing. Mak e

sure you are standing ﬁrmly and that there is nothing in the way that might make you trip or lose your balance.

Lack of concentration can lead to kickback if the kickback zone of the bar accidentally touches a branch, nearby tree or some other object.

8 Before moving your chain saw switch off the engine

and lock the chain using the chain brake. Carry the chain saw with the bar and chain pointing backwards. Fit a guard to the bar before transporting the chain saw or carrying it for any distance.

9 When you put the chain saw on the ground, lock the

saw chain using the chain brake and ensure you hav e a constant view of the machine. Switch the engine off before leaving your chain saw for any length of time.

General rules

1 If you understand what kickback is and how it happens

then you can reduce or eliminate the element of surprise. By being prepared you reduce the risk. Kickback is usually quite mild, but it can sometimes be very sudden and violent.

2 Always hold the chain saw ﬁrmly with your right hand

on the top handle and your left hand on the front handle. Wrap your ﬁngers and thumbs around the handles. You should use this grip whether you are right-handed or left-handed. This grip minimises the

Have control over the workpiece. If the pieces you intend to cut are small and light, they can jam in the saw chain and be thrown towards you. Even if this does not need to be a danger, you may be surprised and lose control of the saw. Ne ver saw stac ked logs or branches without ﬁrst separating them. Only sa w one log or one piece at a time. Remove the cut pieces to keep your working area safe.

4 Never use the chain saw above shoulder height

and try not to cut with the tip of the bar. Ne ver use the chain saw one-handed!

5 Always use a fast cutting speed, i.e. full throttle.

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WORKING TECHNIQUES

6 If you have to cut branches or the like that are above

shoulder height, a working platform or scaffold tower

is recommended.

7 T ak e great care when y ou cut with the top edge of the

bar, i.e. when cutting from the underside of the object.

This is known as cutting on the push stroke. The chain

tries to push the chain saw back towards the user. If

the saw chain is jamming, the saw may be pushed

back at you.

8 Unless the user resists this pushing force there is a

risk that the chain saw will move so far backw ards that

only the kickback zone of the bar is in contact with the

tree, which will lead to a kickback.

Working with tree service chain-saws from a rope and harness

This chapter sets out working practices to reduce the risk of injury from tree service chainsaws when working at height from a rope and harness. While it may form the basis of guidance and training literature, it should not be regarded as a substitute for formal training.

General requirements working at height

Operators of tree service chainsaws working at height from a rope and harness should never work alone. A competent ground worker trained in appropriate emergency procedures should assist them.

Operators of tree service chainsaws for this work should be trained in general safe climbing and work positioning techniques and shall properly equipped with harnesses, ropes, strops, karabiners and other equipment for maintaining secure and safe working positions for both themselves and the saw.

Preparing to use the saw in the tree

The chainsaw should checked, fuelled, started and warmed up by the ground worker before it is sent up to the operator in the tree. The chainsaw should be ﬁtted with a suitable strop for attaching to the operator’s harness:

a) choke the strop around the attachment point on the rear of the saw (A).

Cutting with the bottom edge of the bar, i.e. from the

top of the object downwards, is known as cutting on

the pull stroke. In this case the chain saw pulls itself

towards the tree and the front edge of the chain saw

body rests naturally on the trunk when cutting. Cutting

on the pull stroke gives the operator better control over

the chain saw and the position of the kickback zone.

9 Follow the instructions on sharpening and maintaining

your bar and chain. When you replace the bar and

chain use only combinations that are recommended

by us. See instructions under the headings Cutting

equipment and Technical data.

b) provide suitable karabiners to allow indirect (i.e. via the strop) and direct attachment (i.e. at the attachment point on the saw) of saw to the operators harness.

c) ensure the saw is securely attached when it is being sent up to the operator.

d) ensure the saw it secured to the harness before it is disconnected from the means of ascent.

The saw should only be attached to the recommended attachment points on the harness. These may be at midpoint (front or rear) or at the sides. Where possible attaching the saw to centre rear mid-point will keep it clear of climbing lines and support its weight centrally down the operator’s spine.

When moving the saw from any attachment point to another, operators should ensure it is secured in the new position before releasing it from the previous attachment point.

English – 23

WORKING TECHNIQUES

Using the chainsaw in the tree

An analysis of accidents with these saws during tree service operations shows the primary cause as being inappropriate one-handed use of the saw. In the vast majority of accidents, operators fail to adopt a secure work position witch allows them to hold both handles of the saw. This results in an increased risk of injury due to:

• not having a ﬁrm grip on the saw if it kicks back.

• a lack of control of the saw such that it is more liable to contact climbing lines and operators body (particularly the left hand and arm)

• losing control from insecure work position resulting in contact with the saw (unexpected movement during operation of the saw)

Securing the work position for two-handed use

To allow the operator to hold the saw with both hands, they should as general rule, aim for secure work position where they are operating the saw at:

• hip level when cutting horizontal sections.

• solar plexus level when cutting vertical sections.

Where the operator is working close into vertical stems with a low lateral forces on their work position, then a good footing may be all that is needed to maintain a secure work position. Howe v er as operators mov e aw a y from the stem, they will need to take steps to remove or counteract the increasing lateral forces by, for example, a re-direct of the main line via a supplementary anchor point or using an adjustable strop direct from the harness to a supplementary anchor point.

Gaining a good footing at the working position can be assisted by use of a temporary foot stirrup created from an endless sling.

Starting the saw in the tree

When starting the saw in the tree, the operator should: a) apply the chain brake before starting. b) hold saw on either the left or right of the body when

starting: 1 on the left side hold the saw with the left hand on the

front handle and thrust the saw away from the body while holding the pull starter cord in the other hand.

2 on the right side, hold the saw with the right hand on

either handle and thrust the saw away from the body while holding the pull starter cord in the left hand.

The chain brake should always be engaged before lowering a running saw onto its strop. Operators should always check the saw has sufﬁcient fuel before undertaking critical cuts.

One-hand use of the chainsaw

Operators should never use a chain saw onehanded. Operators should never:

• cut with the kickback zone at the tip of the chainsaw guide bar

• ‘hold and cut’ sections.

• attempt to catch falling sections.

• Cut in the tree when he/she is only secured with one rope, always use 2 secured lines.

• check condition of harness, belt and ropes at regular frequent intervals.

Freeing a trapped saw

If the saw should become trapped during cutting, operators should:

• switch off the saw and attach it securely to the tree inboard (i.e. towards the truck side) of the cut or to a separate tool line.

• pull the saw from the kerf whilst lifting the branch as necessary.

• if necessary, use a handsaw or second chain saw to release the trapped saw by cutting a minimum of 30 cm away from the trapped saw.

Whether a handsaw or a chainsaw is used to free a stuck saw, the release cuts should always be outboard (toward the tips of the branch), in order to prevent the saw being taken with the section and further complicating the situation.

Basic cutting technique

WARNING! Never use a chain saw by holding it with one hand. A chain saw is not safely controlled with one hand; you can cut yourself. Always have a secure, ﬁrm grip around the handles with both hands.

General

• Always use full throttle when cutting!

• Reduce the speed to idle after every cut (running the engine for too long at full throttle without any load, i.e. without any resistance from the chain during cutting, can lead to serious engine damage).

• Cutting from above = Cutting on the pull stroke.

• Cutting from below = Cutting on the push stroke.

Cutting on the push stroke increases the risk of kickback. See instructions under the heading How to avoid kickback.

Terms

Cutting = General term for cutting through wood. Limbing = Cutting branches off a felled tree. Splitting = When the object you are cutting breaks off

before the cut is complete.

24 – English

WORKING TECHNIQUES

There are ﬁve important factors you should consider before making a cut:

1 Make sure the cutting equipment will not jam in the

cut.

2 Make sure the object you are cutting will not split.

3 Make sure the chain will not strike the ground or any

other object during or after cutting.

4 Is there a risk of kickback?

5 Do the conditions and surrounding terrain affect how

safely you can stand and move about?

T wo factors decide whether the chain will jam or the object that you are cutting will split: the ﬁrst is how the object is supported before and after cutting, and the second is whether it is in tension.

In most cases you can avoid these problems b y cutting in two stages; from the top and from the bottom. You need to support the object so that it will not trap the chain or split during cutting.

Cut all the way through the log from above. Avoid letting the chain touch the ground as you ﬁnish the cut. Maintain full throttle but be prepared for what might happen.

- If it is possible (can you turn the log?) stop cutting about 2/3 of the way through the log.

- Turn the log and ﬁnish the cut from the opposite side.

The log is supported at one end. There is a high risk that it will split.

Start by cutting from below (about 1/3 of the way through).

WARNING! If the chain jams in the cut: stop the engine! Don’t try to pull the

chain saw free. If you do you may be injured by the chain when the chain saw suddenly breaks free. Use a lever to open up the cut and free the chain saw.

The following instructions describe how to handle the commonest situations you are likely to encounter when using a chain saw.

Cutting The log is lying on the ground. There is little risk of the

chain jamming or the object splitting. However there is a risk that the chain will touch the ground when you ﬁnish the cut.

- Finish by cutting from above so that the two cuts meet.

The log is supported at both ends. There is a high risk that the chain will jam.

English – 25

WORKING TECHNIQUES

- Start by cutting from above (about 1/3 of the way through).

- Finish by cutting from below so that the two cuts meet.

Limbing

When limbing thick branches you should use the same approach as for cutting.

Cut difﬁcult branches piece by piece.

Felling technique for tree tops

”jammed” tree top is very dangerous (see point 4 in this section).

Once you have decided which wa y you want the top of the tree to fall you must assess which wa y the top of the tree would fall naturally.

Several factors affect this:

• Lean of the tree

• Bend

• Wind direction

• Arrangement of branches

• Weight of snow

WARNING! It takes a lot of experience to fell a tree. Inexperienced users of chain

saws should not fell trees. Do not attempt any task that you feel unsure of!

Safe distance

During tree maintenance work above ground level, the working area must always be secured and marked out with signs, tape or the like. The safe distance between the top of the tree that is to be felled and the nearest workplace must be at least 2 1/2 times the height of the tree. Make sure that no-one else is in this risk zone bef ore or during felling.

Felling direction

The aim is to fell the tree in a position where you can limb and cross-cut the log as easily as possible. You want it to fall in a location where you can stand and move about safely. The main thing to avoid is that the falling tree top should get jammed in another tree. Taking down a

26 – English

You may ﬁnd you are forced to let the tree-top fall in its natural direction because it is impossible or dangerous to try to make it fall in the direction you ﬁrst intended.

Another very important factor, which does not affect the felling direction but does affect y our safety , is to make sure the tree has no damaged or dead branches that might break off and hit you during felling.

WARNING! During critical felling operations, hearing protectors should be lifted immediately when sawing is completed so that sounds and warning signals can be heard.

Topping a tree

T opping a tree is done using three cuts. First you make the directional cuts, which consist of the top cut and the bottom cut, then you ﬁnish with the felling cut. By placing these cuts correctly you can control the felling direction very accurately.

WORKING TECHNIQUES

Directional cuts

T o make the directional cuts you begin with the top cut. T ry to take your position in the tree on the right side and cut on the pull stroke.

move in the opposite direction to your intended felling direction.

Next make the bottom cut so that it ﬁnishes exactly at the end of the top cut.

The directional cuts should run 1/4 of the diameter through the trunk and the angle between the top cut and bottom cut should be 45°.

The line where the two cuts meet is called the directional cut line. This line should be perfectly horizontal and at right angles (90°) to the chosen felling direction.

Felling cut

The felling cut is made from the opposite side of the tree and it must be perfectly horizontal. Try to take a correct position so you are able to cut on the pull stroke.

Make the felling cut about 3-5 cm (1.5-2 inches) above the bottom directional cut.

Finish the felling cut parallel with the directional cut line so that the distance between them is at least 1/10 of the trunk diameter. The uncut section of the trunk is called the felling hinge.

The felling hinge controls the direction that the tree falls in.

All control over the felling direction is lost if the felling hinge is too narrow or non-existent, or if the directional cuts and felling cut are badly placed.

We recommend that you use a bar that is longer than the diameter of the tree, so that you can make the felling cut and directional cuts with single cutting strokes. See the T echnical data section to ﬁnd out which lengths of bar are recommended for your saw.

There are methods for felling trees with a diameter larger than the bar length. However these methods involve a much greater risk that the kickback zone of the bar will come into contact with the tree.

Set the spike bumper (if one is ﬁtted) just behind the felling hinge. Use full throttle and advance the chain/bar slowly into the tree. Make sure the tree-top does not start to

WARNING! Unless you have special training we advise you not to fell trees with a diameter larger than the bar length of your saw!

English – 27

WORKING TECHNIQUES

Freeing a tree that has fallen badly

Cutting trees and branches that are in tension

Preparations: Work out which side is in tension and where the point of

maximum tension is (i.e. where it would break if it was bent even more).

Decide which is the safest way to release the tension and whether you are able to do it safely. In complicated situations the only safe method is to put aside your chain saw and use a winch.

General advice:

Position yourself so that you will be clear of the tree or branch when the tension is released.

Make one or more cuts at or near the point of maximum tension. Make as many cuts of sufﬁcient depth as necessary to reduce the tension and make the tree or branch break at the point of maximum tension.

and upwards towards the user. However, the chain saw may move in a diff erent direction depending on the wa y it was being used when the kickback zone of the bar touched the object.

Kickback only occurs if the kickback zone of the bar touches an object.

Cutting the trunk into logs

See instructions under the heading Basic cutting technique.

Never cut straight through a tree or branch that is in tension!

How to avoid kickback

WARNING! Kickback can happen very suddenly and violently; kic king the chain

saw, bar and chain back at the user. If this happens when the chain is moving it can cause very serious, even fatal injuries. It is vital you understand what causes kickback and that you can avoid it by taking care and using the right working technique.

What is kickback?

The word kickback is used to describe the sudden reaction that causes the chain saw and bar to jump off an object when the upper quadrant of the tip of the bar, known as the kickback zone, touches an object.

Kickback always occurs in the cutting plane of the bar. Normally the chain saw and bar are thrown backwards

28 – English

General

The user must only carry out the maintenance and service work described in this manual.

IMPORTANT! Any maintenance other than that described in this manual must be carried out by your servicing dealer (retailer).

Carburettor adjustment

Due to existing environmental and emissions legislation your chain saw is equipped with movement limiters on the carburettor adjuster screws. These limit the adjustment possibilities to a maximum of a 1/4 turn.

1/4

Your Husqvarna product has been designed and manufactured to speciﬁcations that reduce harmful emissions.

Function

•

The carburettor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburettor . The air/fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.

• Adjusting the carburettor means that the engine is adapted to local operating conditions, e.g. climate, altitude, petrol and the type of 2-stroke oil.

• The carburettor has three adjustment controls:

- L = Low speed jet

- H = High speed jet

- T = Idle adjustment screw

The L and H-jets are used to adjust the supply of fuel

• to match the rate that air is admitted, which is controlled with the throttle. If they are screwed clockwise the air/fuel ratio becomes leaner (less fuel) and if they are turned anti-clockwise the ratio becomes richer (more fuel). A lean mixture giv es a higher engine speed and a rich mixture gives a lower engine speed.

• The T-screw regulates the throttle setting at idle speed. If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

MAINTENANCE

Basic settings and running in

The basic carburettor settings are adjusted during testing at the factory . A void running at a too high speed during the ﬁrst 10 hours.

CAUTION! If the chain rotates while idling the T-screw must be turned anti-clockwise until the chain stops.

Rec. idle speed: 2900 rpm

Fine adjustment

When the machine has been ”run-in” the carburettor should be ﬁnely adjusted. The ﬁne adjustment should be carried out by a qualiﬁed person. First adjust the L-jet, then the idling screw T and then the H-jet.

Changing the type of fuel

Fine tuning may be required if the chain saw, after changing the type of fuel, performs differently with regard to starting, acceleration, maximum speed, etc.

Conditions

• Before any adjustments are made the air ﬁlter should be clean and the cylinder cover ﬁtted. Adjusting the carburettor while a dirty air ﬁlter is in use will result in a leaner mixture next time the ﬁlter is cleaned. This can give rise to serious engine damage.

• Do not attempt to adjust the L and H jets beyond either stop as this could cause damage.

• Now start the machine according to the starting instructions and let it warm up for 10 minutes.

• Place the machine on a ﬂat surface so that the bar points away from you and so that the bar and chain do not come into contact with the surface or other objects.

Low speed jet L

Turn the low speed jet L clockwise until it stops. If the engine accelerates poorly or idles unevenly, turn the low speed jet L anticlockwise until good acceleration and idling are achieved.

Fine adjustment of the idle speed T

Adjust the idle speed with the T-screw. If it is necessary to re-adjust, turn the T-screw clockwise while the engine is running, until the chain starts to rotate. Then turn anticlockwise until the chain stops. When the idle speed is correctly adjusted the engine should run smoothly in every position and the engine speed should be safely below the speed at which the chain starts to rotate.

WARNING! Contact your servicing dealer, if the idle speed setting cannot be adjusted so that the chain stops. Do not use the chain saw until it has been properly adjusted or repaired.

English – 29

MAINTENANCE

High speed jet H

At the factory the engine is adjusted at sea level. When working at a high altitude or in different weather conditions, temperatures and atmospheric humidity, it may be necessary to make minor adjustments to the high speed jet.

CAUTION! If the high speed jet is screwed in too far, it may damage the piston/cylinder.

When test run at the factory, the high speed jet is set so that the engine satisﬁes the applicable legal requirements at the same time as achieving maximum performance. The carburettor’s high speed jet is then locked using a limiter cap in the fully screwed out position. The limiter cap limits the potential to adjust the high speed jet to at most half a turn.

Correctly adjusted carburettor

When the carburettor is correctly adjusted the machine accelerates without hesitation and 4-cycles a little at full throttle. It is also important that the chain does not rotate at idle. If the L-jet is set too lean it may cause starting difﬁculties and poor acceleration. If the H-jet is set too lean the machine will have less power, poor acceleration and could suffer damage to the engine.

Checking, maintaining and servicing chain saw safety equipment

Note! All service and repair work on the machine demands special training. This is especially true of the machine’s safety equipment. If y our machine fails any of the checks described below we recommend that you take it to your service workshop.

Chain brake and front hand guard

Checking brake band wear

Checking the front hand guard

Make sure the front hand guard is not damaged and that there are no visible defects such as cracks.

Move the front hand guard forwards and back to make sure it moves freely and that it is securely anchored to the clutch cover.

Checking the brake trigger

Place the chain saw on ﬁrm ground and start it. Make sure the chain does not touch the ground or any other object. See the instructions under the heading Start and stop.

Grasp the chain saw ﬁrmly, wrapping your ﬁngers and thumbs around the handles.

Brush off any wood dust, resin and dirt from the chain brake and clutch drum. Dirt and wear can impair operation of the brake.

Regularly check that the brake band is at least 0.6 mm thick at its thinnest point.

30 – English

Apply full throttle and activate the chain brake by tilting your left wrist forward onto the front hand guard. Do not let go of the front handle. The chain should stop

immediately.

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