Operator's manual (EPA) ____

371K 375K

Please read these instructions carefully and makesure you understand them before using the machine. English

SYMBOL EXPLANATION

Symbols on the power cutter:

WARNING! The power cutter can bedangerous! Careless and incorrect use canresult in serious or fatal injury to theoperator or others.

Please read the instructions carefully andmake sure you understand them beforeusing the power cutter.

QAAk

Always wear:• Approved protective helmet• Approved hearing protection• Protective glasses or visor

WarningCutting creates a lots of dust which cancause inhalation damages. Useappropriate dust mask or respiratorprotection. Avoid breathing petrol fumesand exhaust gases. Provide for goodventilation.

WarningSparks from the cutting blade can causefire in combustible materials such as: petrol(gas), wood, dry grass etc.

Symbols in the Operator's Manual:

Switch off the engine by moving the stopswitch to the STOP position before carryingout any checks or maintenance.

Always wear approved protective gloves.

Regular cleaning is required.

_l Protective glasses or a visor must be worn.

2 - English

CONTENTS

Before using your new Power cutter• Read the Operator's Manual carefully.• Check the assembly and adjustment of the cutting blade, see

chapter "Assembly'.• Start the engine and check the carburettor settings. See

chapter "Maintenance", section "Carburetor'. When adjustedcorrectly the cutting blade should not rotate when idling.Setting the idling speed is described in the Operator'sManual. Adjust the speed according to these instructions. Donot use the power cutter if the idling speed is not correctlyadjusted!

• Let your Husqvarna dealer check the power cutter and carryout essential adjustments and repairs.

Maintenance, replacement, or repair of the emissioncontrol devices and systems may be performed by anynonroad engine repair establishment or individual.

WARNINGThe engine exhaust from this productcontains chemicals known to theState

of California to cause cancer, birthdefects or other reproductive harm.

You will find the following label on your power cutter:

A WARNING ACutters can be dangerous !For safe operation follow all safetyprecautions in operator's manual.

IMPORTANT ENGINE INFORMATIONBHusqw_a 371K 71 cc 3HVXSJ71ERC

375K 75 cc 3HV)(S_765RBHUSQVARNAABHUSKVARNASWEDEN

THISENGINECONFORMS3"01097U_. EPAEMISSIONREGULATIONFORSMALLNONROADENGINES.

REFERTO OPERATOR'SMANUALFORMAINTENANCESPECIFICATIONSANDADJUSTMENTS.

List of ContentsSymbol explanation .....................................................2

Safety instructionsPersonal protective equipment ....................................... 4The power cutter's safety equipment ...................... 4

Control, maintenance and service of the machine's safetyequipment ............................................................................ 5

General safety instructions .............................................. 6Transport and storage ......................................................... 6Fuel safety ........................................................................... 7

General working instructions ........................................... 7Cutting ................................................................................. 7Kickback .............................................................................. 8

Care and storage ................................................................. 9

Cutting blades .................................................................... lOAbrasive discs ................................................................... 10

Cutting blades ................................................................... 11Diamond blades ................................................................ 11

What is what?What is what on a power cutter? ....................................... 12

AssemblyFitting the cutting head ...................................................... 13Checking the drive shaft and flanges ................................ 13Fitting the cutting blade ..................................................... 13

Fuel handlingFuel mixture ....................................................................... 14

Fuelling .............................................................................. 14

Start and stopStart and stop .................................................................... 15

MaintenanceAdjusting the drive belt ...................................................... 16Changing the drive belt ..................................................... 16Carburettor ........................................................................ 17Fuel filter ............................................................................ 18Air filter .............................................................................. 18Starter ................................................................................ 19

Spark plug ......................................................................... 20Muffler ................................................................................ 20

Cooling system .................................................................. 20Daily maintenance ............................................................. 21Weekly maintenance ......................................................... 21Monthly maintenance ........................................................ 21

Technical Data371K .................................................................................. 22375K .................................................................................. 22

Emission Control Warranty StatementYour warranty rights and obligations ................................. 23

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

English - 3

SAFETY INSTRUCTIONS

PERSONAL PROTECTIVE EQUIPMENT

• PROTECTIVE HELMET• EAR PROTECTION• PROTECTIVE GLASSES

OR FULL FACEPROTECTION

• BREATHING MASK

• HEAVY-DUTY, FIRM GRIPGLOVES

• SNUG-FITTING, HEAVY-DUTY, COMFORTABLECLOTHING THAT ALLOWSFULL FREEDOM OFMOVEMENT

• LEG PROTECTION(TOPROTECT AGAINSTSPARKSAND CUTTINGFRAGMENTS)

• ANTI-SLIP BOOTS WITHSTEEL TOE CAPS

• FIRST AID KIT SHOULDALWAYS BE ON HAND

THE POWER CUTTER'S SAFETYEQUIPMENTThis section describes the power cutter's safety equipment, itsfunction and how checks and maintenance are carried out toensure that it operates correctly. (See the chapter "What iswhat" to locate where this equipment is positioned on yourpower cutter.)

1 Anti-vibration

system

Your power cutter is equippedwith an anti-vibration system.This is designed to give as lowvibration levels andcomfortable usage as possible.

The power cutter's anti-vibration system reduces thetransfer of vibration between

the engine/cutting equipmentand the cutting trolley. Theengine body including thecutting equipment issuspended in a handle systemvia anti-vibration elements.

2 Stop switch

The stop switch should beused to stop the engine.

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SAFETY INSTRUCTIONS

3 Muffler

The muffler is designed togive the lowest possible noiselevel and to direct the engine'sexhaust fumes away from theuser. The engine's exhaustfumes are hot and can contain

sparks, which can lead to theoutbreak of fire.

MPORTANT INFORMATION! It is extremely important thatthe instructions for checking, maintaining and servicingthe muffler are followed. (see the section "Control,maintenance and service of the machine's safety

equipment'S.

4 Throttle lockThe throttle lock is designedto prevent accidental opera-tion of the throttle control.When you press the lock (A)(i.e. when you grasp thehandle) it releases the throttletrigger (B). When you releasethe handle the throttle triggerand the throttle lock bothmove back to their originalpositions. This movement iscontrolled by two independentreturn springs. This arrange-ment means that the throttlecontrol is automatically lockedat the idle setting when yourelease the handle.

A

B

5 Blade guard for the cutting blade

The blade guard is mountedabove the cutting blade andprevents cutting fragmentsfrom being thrown towards theuser.

Control, maintenance and service ofthe machine's safety equipment

1 Anti-vibration system

Check the anti-vibration

elements regularly for materialcracks and deformation.

Check that the anti-vibration

elements are securelymounted between the engineunit and the handle system.

2 Stop switchStart the engine and makesure that the engine stopswhen the stop switch ismoved to the stop position.

English = 5

3

4

1

3

4

Muffler

Never use a machine thathas a defective muffler.

Check regularly that themuffler is secured to the

engine body.

Throttle lock

Make sure the throttlecontrol is locked at theidle setting when yourelease the throttle lock.

Press the throttle lock andmake sure it returns to itsoriginal position when yourelease it.

Check that the throttlecontrol and throttle lockmove freely and that thereturn springs workproperly.

Start the power cutter andapply full throttle. Releasethe throttle control andcheck that the blade stopsand remains stationary. Ifthe blade rotates whenthe throttle is on idle

setting you should checkthe carburettor idleadjustment. See thesection on "Maintenance".

SAFETY INSTRUCTIONS

5 Blade guard for the cutting blade

Never use a defective bladeguard or a blade guard that isnot fitted correctly.

_ _er_i__6_ks_ .....................

GENERAL SAFETY INSTRUCTIONS

IMPORTANT INFORMATION!

Do not use the power cutter until you have read theentire contents of this Operator's Manual.All servicing, in addition to the points listed in thesection "Control, maintenance and service of thepower cutter's safety equipment', should be carriedout by trained service specialists.

• Use the equipment recommended in the chapter "Personalsafety equipment",

• Never use the machine when you are tired, under theinfluence of medicines/drugs or alcohol.

• Do not lend the power cutter to anyone without providing thisOperator's Manual. Ensure the person using the power cutterunderstands the information in this Operator's Manual.

Transport and storage• Store the power cutter under lock and key so that it's out of

reach for children and unauthorised persons.

• Do not store or transport the power cutter with the cuttingblade fitted.

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SAFETY INSTRUCTIONS

Fuel safety(Filling/Fuel mixture/Storage)

• Never fill the machine whilethe engine is running.

• Provide good ventilationwhen filling or mixing fuel(petrol and 2-stroke oil).

• Move the machine at least 3

m from the filling positionbefore starting.

• Never start the machine:

a) If you have spilt fuelon it. Wipe up allspillage.

b) If you have spilt fuelon yourself or yourclothes. Change yourclothes.

c) If there is a fuel leak.Make regular checks forleakage from the fuelcap and the fuel supplypipes.

Min3m j(lOft)

• Store the power cutter and fuel so that any leakage or fumesdo not risk coming into contact with sparks or naked flames.For example, electric machines, electric motors, electricalswitches/power switches, heaters or the like.

• When storing fuel, approved containers intended for thispurpose must be used.

• When storing the power cutter for long periods the fuel tankmust be emptied. Contact your local petrol station to find outhow to dispose of excess fuel.

• Use a Husqvarna fuel can with an anti-spill device.

i_

GENERAL WORKING INSTRUCTIONSThis section takes up the basic safety precautions for workingwith the power cutter. Follow these general working instructions,but never use a machine without the possibility of calling forhelp in the event of an accident.

Basic safety precautions

IMPORTANT INFORMATION! Never work with a powercutter that is defective or incorrectly adjusted. Do notwork with a power cutter that is incomplete or whereassembly has not been carried out in a satisfactorymanner. Check that the cutting blade stops rotatingwhen the throttle is released. If you encounter a situationwhere you are uncertain how to proceed you should askan expert.Avoid all usage which you consider to be beyond yourcapability.

• Check that no one is in the immediate vicinity when themachine is started or while working with the machine toensure that people, animals or other things cannot affect yourcontrol of the power cutter.

• Avoid usage in unfavourable weather conditions, for example,thick fog, heavy rain, strong winds or extreme cold, etc. Towork in bad weather conditions is tiring and can createdangerous circumstances, e.g. slippery surfaces.

• Never start to work with the power cutter before the workingarea is clear and you have a firm foothold. Look out for anyobstacles with unexpected movement. Ensure when cuttingthat no material can become loose and fall, causing operatinginjury.Take great care when working on sloping ground.

• Make sure clothing and parts of the body do not come intocontact with the cutting blade when the engine is started.

• Maintain a safe distance from the cutting blade when theengine is running.

• The blade guard should always be fitted when the engine isrunning.

• Ensure that the working area is sufficiently illuminated tocreate a safe working environment.

• Check the cutting area for buried cables and wires.

Cutting

• Start cutting with the engine at full throttle.

• Always hold the power cutter firmly, with both hands. Holdthe machine so that the thumb and fingers grip around thehandle.

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SAFETY INSTRUCTIONS

Cutting techniqueThe technique described below is of a general character. Checkinformation for each blade regarding individual cutting characte-ristics. (For example, a diamond blade requires less feedingpressure than a abrasive blade

1.Support the work piece insuch away that you canpredict what will happenand so it will not pinch.

2. Always cut at full throttle.

3.Start cutting gently, donot force or squeeze theblade in.

4. Use a high blade speed.

5. Move the blade slowlybackwards and forwards.

6. Use a small part of theblade's cutting edge.

7.Only use the blade'scutting edge whencutting.

8.Cut with the blade fullyvertical - at right anglesto the work piece.

\

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8 = English

Water cooling

increases

blades');i

Sharpening diamond bladesBlades can become dull when the wrong feeding pressure isused or when cutting some materials such as heavily reinforcedconcrete. To force a dull blade results in overheating and finallythe loss of segments (part of the blade).

Sharpen against a soft material such as sandstone or hayditebrick.

Blade vibration

The blade can become out of shape (not round) and vibrate if atoo high feeding pressure is used or if the blade is pressed intothe work piece.

A lower feeding pressure ought to stop the vibration. Otherwisereplace the cutting blade.

Kickback

If the sector of the blade illustrated below is used for cutting theblade can start to climbing and kickback the power cutterupwards and backwards towards the user with immense force.

How to avoid kickback1. Never cut with the

segment illustrated in thediagram.

2. Keep a good balance anda firm foothold.

3. Use both hands and takea firm grip with the thumband fingers around thehandle.

4. Keep the work piece at acomfortable distance.

5. Use the cutter at fullthrottle.

6.Take care when insertingthe blade in an existingcut.

7. Never cut above shoulderheight.

8. Be alert to movement ofthe work piece or anythingelse that can occur, whichcould cause the cut to

close and pinch the blade.

SAFETY INSTRUCTIONSPull in

Pull in occurs when the lower part of the blade is suddenlystopped or when the cut closes. (To avoid this see the section"How to avoid kickbacl#' and "Pinching/rotation" below).

Pinching/rotationPinching occurs when the cut closes. The power cutter can bedrawn suddenly and powerfully downwards.

How to avoid pinchingSupport the work piece insuch a way that the cutremains open during thecutting operation and whenthe cut is finished.

Drying the bladeAfter using an abrasive bladewith water cooling, let thecutter run at full throttle forapprox, haft a minute so thatthe blade dries.

If a damp blade is stored itcan become unbalance andcause damage.

Check the speed of thedrive shaft

Use a tachometer regularly tocheck the speed of the driveshaft when the cutter isrunning at working tempera-ture and at full throttle withouta load. The maximum speedis stated on the unit.

Care and storage

GeneralHusqvarna's power cutters are robust and durable. However, asthey are used for high speed operations all servicing should becarried out on time and as specified, so that the power cutteralways works effectively and safely.

Read this Operator's Manual to determine which serviceroutines you can carry out and ensure that all other servicework is carried out by an authorised service workshop.

Power Cutter

Always handle the power cutter with care and store it with theblade removed.

Blades• All blades should be

removed from the cutterafter use and storedcarefully.

• Special care should betaken with abrasiveblades.

• Blades must be stored ona firm, level surface. Ifblades are supplied with abacking pad then a spacershould be used to keepthem flat.

• Avoid moisture and

temperature extremes.

• Remove the blades beforethe cutter is moved ortransported.

• Inspect new blades fortransport or storagedamage.

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SAFETY INSTRUCTIONS

CUTTING BLADES

GeneralCutting blades are available in two basic designs; abrasivediscs and diamond blades. Only abrasive discs and diamondblades may be used and only within their respective applicationareas.

High speed portable toolsOur cutting blades are manufactured for high-speed, portablepower cutters. If blades from other manufacturers are use&ensure that the blades conform to all regulations and demandsthat concern this type of power cutter.

Special bladesSome cutting blades are designed for stationary equipment andfor use with attachments.Such cutting blades must not be usedon portable power cutters.

Always contact local authorities and make sure you arefollowing applicable directives.

Abrasive discs

The cutting material on abrasive discs consists of grit bondedusing an organic binder. "Reinforced blades" are made up of afabric or fibre base that prevents total breakage at maximumworking speed if the blade should be cracked or damaged. (Theterm reinforced does not refer to those cutting blades that areonly reinforced around the flange).

A cutting blade's performance is determined by the type andsize of abrasive corn, and the type and hardness of the bondingagent.

Characteristics that give the blade a shorter service life andgreater cutting capacity are said to make the blade "softer". Ablade with a longer service life and slower cutting capacity is ablade with a "harder" effect.

High quality cutting blades are normally more economical.Lower quality cutting blades usually have an inferior cuttingcapacity and shorter service life, which results in higher cost perprocessed material.

ABRASIVE DISCS, TYPES AND USES

Use

Blade General Material Water coolingtype characteristics

Con- Universalcrete usage,

economical.

Metal Unbeatable forsteel (notsuitable forconcrete, etc.)

Concrete,asphalt,stone,brickwork,cast iron,aluminium,copper,brass, cables,rubber, etc.

Steel, steelalloys andother hardmetals.

Can be used toreduce dust.The disc shouldnot be stored

after cutting iscomplete aswater affects the

strength of thedisc whilestored.

NOTrecommended.

10 - English

SAFETY INSTRUCTIONSType of cutting bladesThe cutting blade should bemarked with the same or ahigher speed than that statedon the machine's rating plate.Never use a cutting bladewith a lower speed rating thanwhat is stated on themachine's rating plate.

Damage• Ensure the blade it not

cracked or damaged in anyother way.

• Test the abrasive disc byhitting it lightly with a pieceof wood. If the blade doesnot give a full-sounding ringthen it is damaged.

• Never use a blade that hasfallen on the floor.

Assembly• Check that the blade is

fitted correctly and issecure.

• Follow all specifications inthe table below.

Specifications for fitting blades

Standard blades inches .787 7/8 1centre hole mm 20 22,2 25,4(spindle)

Reducing bush* Max. thickness Blade thicknessMin thickness 3 mm (1/8")

Backing pad Material Highly compressible,(Must be used) e.g. blotting paper

Max. thickness 0,5 mm (.020")

Spindle hole/ Play 0,2 mm (.010")drive shaft

Flange tightening The bolt is tightened to 15-25 Nm

Blade/guard Check that the blade runs free of theguard.

* Plastic reducing bushes may only be used with abrasivediscs. Do not use reducing bushes with diamond blades ortungsten carbide blades.We recommend that the spindle isreplaced so that it fits the blades to be used rather than usinga reducing bush. Contact your service workshop for details.

Guard

Check that the guard is notcracked or shows signs of anyother damage. Clean theinside of the guard beforefitting a new blade. Check thatthe guard can be adjusted.

Diamond blades

Diamond blades consist of a steel body with segments thatcontain industrial diamonds

DIAMOND BLADES, TYPES AND USES

Diamond General char- Material Water coolingblade acteristics

Low cost percutting opera-tion. Fewer

blade changes.Constant

cutting depth.Less dust.

All brickwork,reinforcedconcrete andothercompositematerials.NOTrecommendedfor metal.

Increases theblade's servicelife

Using diamond blades

Proceed as follows:

• Let the cutting blade rotate in the same direction as thearrow markings indicate.

• Cool continually with water.

• Keep the cutting blade sharp.

• Remove the cutting blade when the machine is transported.

Avoid:

• Running the cutting blade in the wrong direction.

• Forcing a dull blade or wedging the blade into a cut.

• Transporting the power cutter with the blade fitted.

• Letting the blade fall on the work piece.

Diamond blades for dry cutting

Diamond blades for dry cutting are a new generation of bladesthat do not require water cooling. However, the blades are stilldamaged by excessive heat. It is good economics to let theblade cool by simply lifting the blade from the cut every 30-60seconds and let it rotate in the air, for 10 seconds to cool.

Eng$ish - 11

WHAT IS WHAT?

® @

What is what on a power cutter?

1. Cylinder cover

2. Muffler

3. Fuel tank

4. Rear handle

5. Choke/Throttle trigger lockout

6. Throttle catch

7. Stop switch

8. Cutting head

9. Cutting arm

10. Belt tensioning screw

11. Cutting blade

12. Throttle

13. Combination spanner

14. Air filter cover

15. Blade guard

16. Starter handle

17. Operator's manual

18. Adjustment lever for blade guard

19. Front handle

20. Starter

21. Decompression valve

22. Warning decal

23. Type plate

12 - English

ASSEMBLY

Fitting the cutting head

Remove the bolt (1) and nut(2). Remove the cover. Fit thedrive belt over the clutchdrum. Refit the cover andtighten the bolt (1) and nut (2).

Feed the drive belt over thepulley on the cutting head.

Secure the cutting headtogether with the belt guard.Tighten both bolts slightly,then loosen 1/2 turn.

Screw in the tensioning screw(3) so that the square nut is inline with the arrow on the beltguard. Shake the head toensure the spring can tensionthe belt. This automaticallyadjusts the belt to the correcttension. Tighten both bolts (4)using the combinationspanner.NOTE!After fitting a new belt the belttension must be readjustedafter the first two tanks of fuelhave been used.

2

3

Checking the drive shaft and flanges

• Check that the threads onthe drive shaft are

undamaged.

• Check that the contact

surfaces of the cutting bladeand flanges are flat, runcorrectly on the spindle andare free from foreignobjects.

Do not use flanges that aretwisted, have damagededges, untrue or dirty. Donot use different sizeflanges.

Fitting the cutting blade

Husqvarna cutting blades aremanufactured and approvedfor freehand cutting. Thepaper labels on each side ofthe blade are there todistribute the pressure fromthe flange washer and preventthe blade from slipping.

The blade is placed betweenthe flange hub (A) and theflange washer (B). The flangewasher is turned so that it fitsin the flange hub. The cuttingblade is tightened using thesocket spanner 501 69 17-02.

The shaft can be locked usinga screwdriver, steel pin or thelike. This is slid in as far aspossible. The blade is tighte-ned clockwise.

Tightening torque for the boltholding the blade is:15-25 Nm (130-215 inJb).

Blade guard

The blade guard shouldalways be fitted on thepower cutter.The guard should be adjustedso that the rear section isclose to the work piece.Cutting fragments and sparksare then collected by theguard and led away from theuser. By using the lever (A)the guard can be loosenedand set in the requiredposition.

A B

Eng$ish - 13

FUEL HANDLINGFuelmixIMPORTANT! The power cutter is equipped with a two-strokeengine and must always been run using a mixture of gasolineand two-stroke engine oil. It is important to accurately measurethe amount of oil to be mixed to ensure that the correct mixture

is obtained. When mixing small amounts of fuel, even smallinaccuracies can drastically affect the ratio of the mixture.

Gasoline• This engine is certified to

operate on unleadedgasoline.

• Use good quality unleadedgasoline.

• The lowest recommendedoctane rating is 87. If yourun the engine on loweroctane rating than 87 so-called "knocking" can occur.This leads to an increasedengine temperature, whichcan result in a serious

engine breakdown.

• When working at continuoushigh revs a higher octanerating is recommended.

Two-stroke oil• For the best results use

HUSQVARNA two-stroke oil,which is especiallydeveloped for power cutters.Mixing ratio 1:50 (2%).

• Never use two-stroke oilintended for water cooled

outboard engines, so-calle&outboard oil.

• Never use oil intended forfour-stroke engines.

Gasoline Oil2%(1:50)

Lit, Lit.5 0,1010 0,2015 0,3020 0,40US US

gallon fLoz.1 21/2

21/2 61/25 127/8

Mixing• Always mix the gasoline

and oil in a clean containerintended for fuel.

• Always start by filling halfthe amount of the gasolineto be used. Then add theentire amount of oil. Mix(shake) the fuel mixture.Add the remaining amountof gasoline.

• Mix (shake) the fuel mixturethoroughly before filling thesaw's fuel tank.

• Do not mix more than max.one month's supply of fuel.

• If the saw is not used forsome time the fuel tank

should be emptied andcleaned.

• This engine is certified tooperate on unleadedgasoline.

6

Fuelling

• Keep the handle dry, cleanand free from oil and fuel.

• Clean around the fuel cap.Clean the fuel tank

regularly. The fuel filtershould be changed at leastonce per yearContamination in the tank

can disrupt operations.Ensure that the fuel is wellmixed by shaking thecontainer before filling thetank.

• Always exercise care whenfilling the fuel. Move thepower cutter at least threemetres from the filling areabefore starting. Make surethe fuel cap is tightened.

I

14 - English

Start and stop

Starting a cold engine

IGNITION:

Slide the stop switch to theleft.

CHOKE:Pull out the choke.

DECOMPRESSION VALVEPress in the value to reduce

the pressure in the cylinder,this makes starting the powercutter easier. Thedecompression valve shouldalways be used when starting.When the machine has

started the value automaticallyreturns to its original position.

FAST IDLE:Combined choke/fast idle isreceived when the choke ismoved to choke position.

Starting a warmengineUse the same procedure asfor starting cold engine butwithout choke. Fast idle is

recived by first set the chokecontrol in choke position, andthen back again.

START AND STOPStart

Take hold of the front handleusing your left hand. Placeyour right foot on the lowersection of the rear handle andpress the power cutter againstthe ground. Never twist thestarter cord around yourhand.

Grip the starter with your righthand, and slowly pull thestarter cord out until you feelsome resistance (the pawlsgrip) now pull quickly andpowerfully.

NOTE[ Do not pull out thestarter cord completely and donot release the starter fromthe fully extended position.This can damage the powercutter.

When the engine starts,quickly apply full throttle andthe starter throttle catch will

automatically disengage.

Stop

The engine is stopped byswitching off the ignition.(Slide the stop switch to theright.)

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English - 15

MAINTENANCE

Adjusting the drive belt

• The drive belt is fullyenclosed and well protectedfrom dust, dirt andmechanical effects duringthe cutting process.

• To tension the drive belt,slightly loosen the bolts (A),which secure the cuttinghead and belt guard.

• Turn the tensioning screwso that the nut (B) is locateddirectly under the arrow onthe cover. Shake the headto ensure the spring cantension the belt. The beltnow automatically has theright tension.

• Tighten the bolts that holdthe cutting head.

A

B

B

I IMPORTANT INFORMATION! A new drive belt should be

tensioned after using one tank of fuel.

Changing the drive belt

• Loosen the two bolts (A).

• Turn the tensioning screws(B) until the tension hasbeen released.

• Remove the two bolts (A).

• Remove the front belt cover

(c).

• Remove the belt from the

pulley.

• Dismantle the cutting head.

• Remove bolt (E) and nut(D). Remove the side cover.

• Replace the drive belt.

• To assemble reverse the

procedure for dismantling.

• Check the cutting blade'sblade guard for signs ofcracking or other damage.Replace it if damaged.

A

B

D

C

Belt pulley and clutch

Never start the engine when the belt pulley and dutch areremoved for maintenance.

16 - English

MAINTENANCECarburetor

Your Husqvarna product has been designed and manufacturedto specifications that reduce harmful emissions.After your unit has been run 8-10 tanks of fuel the engine hasbroken in. To ensure that your unit is at peak performance andproducing the least amount of harmful emissions after break in,have your authorized servicing dealer, who has a revolutioncounter at his disposal, to adjust your carburetor for optimumoperating conditions.

Functioning, Basic setting, Final setting

Operation• The carburetor governs the engine speed via the throttle. Air/

fuel are mixed in the carburetor.

GovenorThe engine is equipped with in the ignition built in nonadjustable electronic speed limiter. The limiter prevents theengine from being ran at a too high RPM.

• The carburetor has threeadjustment possibilities:

L = Low speed jet.H = High speed jet.T = Adjustment screw for

idling.

• The T screw regulates the idling speed. If the screw T isturned clockwise this gives a higher idling speed; counter-clockwise a lower idling speed.

Basic setting and running inThe carburetor is set to its basic setting when test run at thefactory. Fine adjustment should be carried out by a skilledtechnician.

NOTE! If the disk rotates while idling the T screw should beadjusted counter-clockwise until it stops.Recommended idling speed: 2 500 rpm.

Conditions• Before any adjustments are made the air filters should be

clean and the cylinder cowling fitted. Adjusting the carburetorwhile a dirty air filter is in use will result in a leaner mixturewhen the filter is finally cleaned. This can give rise to seriousengine damage.

• Carefully turn the L and H needle to the mid point.• Do not attempt to adjust the needles beyond the stops as

damage can occur.• Now start the engine according to the starting instructions

and run it warm for 10 minutes.NOTE! If the blade rotates the T screw should be turned

counter-clockwise until the disk stops.• Place the engine on a flat surface so that the disk points

away from you and so that the disk do not come into contactwith the surface or other objects.

Low speed needle LTurn the low speed needle L clockwise until the stop. If theengine has bad acceleration or erratic idling, turn the L needlecounter-clockwise until good idling and acceleration.NOTE! If the disk rotates in the idling position, turn theidling speed screw counter-clockwise until the disk stops.

Final setting of the idling speed TAdjust the idling speed with the screw T. If it is necessary to re-adjust, first turn the idle speed adjusting screw T clockwise, untilthe disk starts to rotate. Then turn, counter-clockwise until thedisk stops. A correctly adjusted idle speed setting occurs whenthe engine runs smoothly in every position. It should also begood margin to the rpm when the disk starts to rotate.

Correctly adjusted carburetorA correctly adjusted carburetor means that the engineaccelerates without hesitation. Furthermore, the disk must notrotate at idling. A too lean adjusted low speed needle L maycause starting difficulties and bad acceleration. A too leanadjusted high speed needle H gives lower power=less capacity,bad acceleration and/or damage to the engine. A too richadjustment of the two speed needles L and H gives accelera-tion problems or too low working speed.

English - 17

MAINTENANCE

Fuel filter• The fuel filter sits inside the fuel tank.

• The fuel tank must be protected from contamination whenfilling. This reduces the risk of operating disturbances causedby blockage of the fuel filter.

• The filter cannot be cleaned but must be replaced with a newfilter when it blocked. The filter should be changed at leastonce per year.

Air filterThe air filter should be cleaned regularly removing dust and dirtto avoid:• Carburettor malfunction

• Starting problems• Reduced engine power• Unnecessary wear to

engine parts

The air filter system consistsof a backup filter (1) and amain filter (2):

1) The main filter is an oiledfoam rubber filter that is

easily accessible under thefilter cover (A). In dustyconditions this filter should

be inspected/replaced eachweek. In order to obtain a

good filtering effect, the filtermust be cleaned and oiled

regularly. SpecialHUSQVARNA oil has been

produced for this purpose.

• Remove the filter. Wash the

filter carefully in tepid,soapy water. After cleaningrinse the filter thoroughly inclean water. Squeeze outthe filter and let the filter

dry.NOTE! Compressed air at ahigh pressure can damagethe foam.

• Oil the filter carefully. It isextremely important that theentire filter is saturated inoil.

A

B

2) The backup filter is a paper filter accessible from undercover B. This filter should be replaced/cleaned when theengine's power drops or each month. The filter is cleanedby shaking or by careful blowing with compressed air. Notethat the filter must not be washed!

A filter used for a long period of time can never be completelycleaned. Therefore all air filters must be replaced periodicallywith a new filter. A damaged air filter must always bereplaced.

I IMPORTANT INFORMATION! I

Insufficient care of the air filter will cause deposits onthe spark plug resulting in abnormal wear to engineparts.

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MAINTENANCEStarter

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Replacing a broken or worn starter cord

• Loosen the bolts that holdthe starter against thecrankcase and lift off thestarter unit.

• Pull out the cord approx. 30cm and lift it out of the cut-out in the starter-pulley'speriphery. Reset the recoilspring by allowing the pulleyto slowly rotate backwards.

• Undo the bolt in the centreof the pulley and removethe pulley. Insert and securea new starter cord in thestarter pulley. Wind approx.3 turns of the starter cord onthe starter pulley. Fit thestarter pulley against thestarter so that the end of thereturn spring hooks into thestarter housing. Fit the boltinto the centre of the starterpulley. Carry the startercord through the hole in thestarter housing and thestarter handle. Tie a goodknot on the starter cord.

Tensioning the recoil spring

• Lift up the starter cord fromthe cut out on the pulley andturn the pulley approx. 2turns clockwise.

NOTE! Ensure the starterpulley can be turned at leasta further 1/2 turn when thestarter cord is fullyextended.

Changing the broken recoil spring

• Lift the starter pulley (see"Changing a broken or wornstarter cord%

• Dissasemble the recoilspring by tapping the pully(with its inside facing down)lightly against a workingbench or similar. If thespring pops out whenassembling, it should bemounted again, out and intowards the centre.

• Lubricate the recoil springwith thin oil. Assemble thestarter pulley, and tensionthe recoil spring.

Fitting the starter

• Fit the starter by first pullingout the starter cord and then

placing the starter inposition on the crankcase.No slowly release thestarter cord so that the

pawls grip in the pulley.

• Fit and tighten the screwsthat hold the starter.

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MAINTENANCE

Spark plug

The condition of the spark plugis affected by:

• An incorrect carburettorsetting.

• An incorrect fuel mixture(too much oil).

• A dirty air filter.

These factors cause depositson the spark plug electrodethat may result in malfunctionor starting difficulties.

• If the machine is low onpower, difficult to start orruns poorly while idlingalways check the sparkplug first. If the spark plugis dirty, clean it and at thesame time check that theelectrode gap is 0,5 mm(.020"). The spark plugshould be changed afterabout one month ofoperation or earlier ifnecessary.

0,5 mm

NOTE! Always use the recommended type of spark plug. (seechapter "Technical data')! An incorrect spark plug can damagethe cylinder/piston.

MufflerThe muffler is designed inorder to reduce the noise leveland to direct the exhaust

gases away from the operator.The exhaust gases are hotand can contain sparks, whichmay cause fire if directedagainst dry and combustiblematerial.

Never use a saw with a

clogged or defective muffler.

Cooling systemTo maintain as low an operating temperature as possible thepower cutter is equipped with a cooling system.

The cooling system consists of:

1. An air intake on thestarter unit.

2. Air flow guide.

3. Cooling fins on theflywheel.

4. Cooling fins on thecylinder

5. Cylinder cover (leads coldair onto the cylinder).

Clean the cooling systemusing a brush at least oncea week, in difficultconditions more often. Adirty or blocked coolingsystem leads to the engineoverheating resulting indamage to the cylinder andpiston.

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MAINTENANCE

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Below follows some general maintenance instructions.If you need further information please contact your serviceworkshop.

Daily maintenance1. Check that throttle components work correctly from a safety

view point (throttle and starter throttle catch).

2. Check the tension of the drive belt.

3. Check the condition of the cutting blade.

4. Check the condition of the blade guard.

5. Check the starter and the starter cord; clean the outside ofthe starter's air intake.

6. Check that all nuts and bolts are tightened correctly.

7. Check that the short-circuiting contact functions.

Weekly maintenance8. Clean the main filter.

9. Check that the handles and anti-vibration elements are notdamaged.

10. Clean the spark plug. Check that the electrode gap is 0.5mm.

11. Clean the cooling fins on the flywheel. Check the starterand recoil spring.

12. Clean the cooling fins on the cylinder.

13. Check the muffler.

14. Check the carburettor.

Monthly maintenance15. Clean the backup filter.

16. Check the clutch drum, drive-pulley, and clutch springs withregard to wear.

17. Clean the outside of the carburettor

18. Check the fuel filter, fuel hose, change if necessary.

19. Clean the inside of the fuel tank.

20. Check all cables and connections.

Eng$ish - 21

TECHNICAL DATA371 K 375K

EngineCylinder volume, cu.in/cm 3 4,3/70,7 4,6/74,7Cylinder bore, inch/mm 1,97/50 2,02/51,4Stroke, inch/mm 1,4/36 1,4/36Idle speed, rpm 2 500 2 500Max. speed, unloade& rpm 9 800 -+250 9 800 -+250Power, kW 3,5/9 300 3,7/9 800

Ignition systemManufacturerType of ignition systemSpark plug

Electrode gap, inch/mm

Fuel and lubrication systemManufacturerCarburettor typeFuel capacity, US pint/litre

WeightWithout fuel and cutting blade, Lbs/kg12" (Q 300 mm)14" (0 300 mm)

FHP SEMCD CDChampion RCJ-7Y Champion RCJ-7YNGK BPMR 7A NGK BPMR 7A0,02/0_5 0,02/0_5

Walbro WalbroHD 20 HD 201,63/0,77 1,63/0,77

20,7/9,421,4/9,7

Cutting equipment

Cutting blade Gear ratio12" 1:1.9714" 1:1.97

Max. peripherical speed80 m/s100 m/s

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FEDERAL EMISSION CONTROL WARRANTY STATEMENT

YOUR WARRANTY RIGHTS ANDOBLIGATIONS

The EPA (The US Environmental Protection Agency),Environment Canada and Husqvarna Forest & Garden arepleased to explain the emissions control system warranty onyour 2002 and later small off-road/nonroad engine. In U.S.and Canada, new small off-road/nonroad engines must bedesigned, built and equipped to meet the federal stringentanti-smog standards. Husqvarna Forest & Garden mustwarrant the emission control system on your small off-road/nonroad engine for the periods of time listed below providedthere has been no abuse, neglect or improper maintenanceof your unit. Your emission control system includes Partssuch as the carburetor and the ignition system.Where a warrantable condition exists, Husqvarna Forest &Garden will repair your small off-road/nonroad engine at nocost to you. Expenses covered under warranty includediagnosis, parts and labor.

MANUFACTURER'S WARRANTY

COVERAGEThe 2002 and later small off-road/nonroad engines arewarranted for two years. If any emission related part on yourengine (as listed above) is defective, the part will be repairedor replaced by Husqvarna Forest & Garden.

OWNER'S WARRANTYRESPONSIBILITIESAs the small off-road/nonroad engine owner, you areresponsible for the performance of the required maintenancelisted in your Operator's Manual. Husqvarna Forest &Garden recommends that you retain all receipts coveringmaintenance on your small off-road/nonroad engine, butHusqvarna Forest & Garden cannot deny warranty solely forthe lack of receipts or for your failure to ensure theperformance of all scheduled maintenance.As the small off-road/nonroad engine owner, you should,however, be aware that Husqvarna Forest & Garden maydeny you warranty coverage if your small off-road/nonroadengine or a part of it has failed due to abuse, neglect,improper maintenance, unapproved modifications or the useof parts not made or approved by the original equipmentmanufacturer.You are responsible for presenting your small off-road/nonroad engine to a Husqvarna Forest & Garden authorizedservicing dealer as soon as a problem exists. The warrantyrepairs should be completed in a reasonable amount of time,not to exceed 30 days.If you have any questions regarding your warranty rights andresponsibilities, you should contact your nearest authorizedservicing dealer or call Husqvarna Forest & Garden at1-800-487-5963.

WARRANTY COMMENCEMENT DATEThe warranty period begins on the date small off-road/nonroad engine is delivered.

LENGTH OF COVERAGEHusqvarna Forest & Garden warrants to the initial owner andeach subsequent purchaser that the engine is free fromdefects in materials and workmanship which cause thefailure of a warranted part for a period of two years.

WHAT IS COVEREDREPAIR OR REPLACEMENT OF PARTS

Repair or replacement of any warranted part will be performedat no charge to the owner at an approved Husqvarna Forest &Garden servicing dealer. If you have any questions regardingyour warranty rights and responsibilities, you should contactyour nearest authorized servicing dealer or call HusqvarnaForest & Garden at 1-888-487-5963.WARRANTY PERIODAny warranted part which is not scheduled for replacement asrequired maintenance, or which is scheduled only for regularinspection to the effect of "repair or replace as necessary"shall be warranted for 2 years. Any warranted part which isscheduled for replacement as required maintenance shall bewarranted for the period of time up to the first scheduledreplacement point for that part.DIAGNOSISThe owner shall not be charged for diagnostic labor whichleads to the determination that a warranted part is defective,if the diagnostic work is performed at an approved HusqvarnaForest & Garden servicing dealer.CONSEQUENTIAL DAMAGESHusqvarna Forest & Garden may be liable for damages toother engine components caused by the failure of a warrantedpart still under warranty.

WHAT IS NOT COVEREDAll failures caused by abuse, neglect or improper maintenanceare not covered.ADD -ON OR MODIFIED PARTS

The use of add-on or modified parts can be grounds fordisallowing a warranty claim. Husqvarna Forest & Garden isnot liable to cover failures of warranted parts caused by theuse of add-on or modified parts.

HOW TO FILE A CLAIMIf you have any questions regarding your warranty rights andresponsibilities, you should contact your nearest authorizedservicing dealer or call Husqvarna Forest & Garden at1-800-487-5963.

WHERE TO GET WARRANTY SERVICEWarranty services or repairs shah be provided at all Husqvar-na Forest & Garden authorized servicing dealers.

MAINTENANCE, REPLACEMENT ANDREPAIR OF EMISSION-RELATED PARTSAny Husqvarna Forest & Garden approved replacement partused in the performance of any warranty maintenance orrepairs on emission-related parts, will be provided withoutcharge to the owner if the part is under warranty.

EMISSION CONTROL WARRANTY PARTS LIST1. Carburetor and internal parts2. Intake pipe, airfilter holder and carburetor bolts.3. Airfilter and fuelfilter covered up to maintainance schedule.4. Ignition System

a) Spark Plug, covered up to maintenance scheduleb) Ignition Module

MAINTENANCE STATEMENTThe owner is responsible for the performance of all requiredmaintenance, as defined in the operator's manual.

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