Husqvarna Saw K650 User Manual

Operator’s manual (EPA)  
K650 Cut-n-Break  
Please read the operator’s manual carefully and make sure you understand the  
instructions before using the machine.  
English  
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CONTENTS  
Contents  
KEY TO SYMBOLS  
Symbols on the machine: .............................................  
Symbols in the operator’s manual: ...............................  
CONTENTS  
Contents ......................................................................  
WHAT IS WHAT?  
4
What is what on the power cutter? ...............................  
SAFETY INSTRUCTIONS  
Steps before using a new power cutter ........................  
Personal protective equipment .....................................  
General safety precautions ..........................................  
Machines safety equipment ........................................  
Checking, maintaining and servicing the machines  
safety equipment ..........................................................  
Diamond blades ...........................................................  
General working instructions ....................................... 10  
ASSEMBLY  
Assembling the blades ................................................. 13  
Protection for the blades .............................................. 13  
FUEL HANDLING  
Fuel .............................................................................. 14  
Fueling ......................................................................... 14  
STARTING AND STOPPING  
Before starting ............................................................. 15  
MAINTENANCE  
Inspecting and adjusting the drive belt ......................... 16  
Replacing the drive belt ............................................... 16  
Belt pulley and clutch ................................................... 17  
Carburetor .................................................................... 17  
Air filter ......................................................................... 18  
Starter .......................................................................... 19  
Spark plug .................................................................... 20  
Cooling system ............................................................ 21  
Muffler .......................................................................... 21  
General maintenance instructions ............................... 21  
TECHNICAL DATA  
Technical data .............................................................. 22  
Cutting equipment ........................................................ 22  
FEDERAL EMISSION CONTROL WARRANTY  
STATEMENT  
YOUR WARRANTY RIGHTS AND OBLIGATIONS ..... 23  
English – 3  
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WHAT IS WHAT?  
HUSQVARNA CONSTRUCTION PRODUCTS  
What is what on the power cutter?  
1
2
3
4
5
6
7
8
9
Operator’s manual (EPA)  
Combination spanner  
Air filter cover  
12 Starter handle  
13 Starter  
14 Decompression valve  
15 Muffler  
Front handle and water tap  
Warning decal  
16 Splash guard  
17 Blades  
Choke  
Stop switch  
18 Blade guards  
19 Belt tensioner  
20 Cutting arm  
21 Fuel tank  
Start throttle lock  
Throttle lockout  
10 Type plate  
11 Cylinder cover  
22 Throttle control  
4 – English  
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SAFETY INSTRUCTIONS  
Steps before using a new power  
cutter  
Personal protective equipment  
WARNING!You must use approved personal  
Please read the operator’s manual carefully and make  
protective equipment whenever you use the  
machine. Personal 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.  
sure you understand the instructions before using the  
machine.  
!
The machine is only designed for cutting hard materials,  
such as concrete, brick, masonry as well as cast iron and  
cement pipes.  
Check the assembly and adjustment of the blades, see  
the instructions under the heading Assembly of blades.  
Protective helmet  
Hearing protection  
Start the engine and check the idling setting, see  
instructions under the heading Maintenance. When the  
carburettor is set correctly the blades should be still while  
idling. Setting of the idle speed is described in the  
Operator’s Manual. Set the correct speed according to  
these instructions. Do not use the power cutter if the idle  
speed is not adjusted correctly!  
Protective goggles or a visor  
Breathing mask  
Let your Husqvarna dealer regularly check the power  
cutter and make essential adjustments and repairs.  
WARNING! Under no circumstances may 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.  
!
Heavy-duty, rm grip gloves.  
WARNING! Use of products which cut, grind,  
drill, sand or shape material can generate  
dust and vapors which may contain harmful  
chemicals. Know the nature of the material  
being worked on and wear appropriate dust  
mask or respirator protection.  
!
Tight-fitting, heavy-duty and comfortable clothing that  
permits full freedom of movement.  
WARNING! A power cutter is a dangerous  
tool if used carelessly or incorrectly and can  
cause serious, even fatal injuries. It is  
extremely important that you read and  
understand the contents of this Operator’s  
Manual.  
!
Boots with steel toe-caps and non-slip sole  
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 have a first aid kit nearby.  
Husqvarna Construction Products has a policy of continuous  
product development. Husqvarna reserves the right to modify  
the design and appearance of products without prior notice  
and without further obligation introduce design modifications.  
All information and all data in the Operator’s Manual were  
applicable at the time the Operator’s Manual was sent to print.  
English – 5  
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SAFETY INSTRUCTIONS  
Personal safety  
General safety precautions  
Wear personal protective equipment. See instructions  
under the heading Personal protective equipment.  
WARNING! Do not use the power cutter until  
you have read the entire contents of this  
Operator’s Manual.  
Never use the machine if you are tired, if you have drunk  
alcohol, or if you are taking medication that could affect  
your vision, your judgement or your co-ordination.  
!
All servicing, in addition to the points listed  
in the section ”Control, maintenance and  
service of the power cutter’s safety  
equipment”, should be carried out by trained  
service specialists.  
Never allow anyone else to use the machine without first  
ensuring that they have understood the contents of the  
operator’s manual.  
Dress properly. Do not wear loose clothing or jewellery.  
Keep your hair, clothing and gloves away from moving  
parts. Loose clothes, jewellery or long hair can be caught  
in moving parts.  
Work area safety  
Keep work area clean and well lit. Cluttered or dark areas  
invite accidents.  
Remain at a distance from the blades when the engine is  
running.  
Never use the machine indoors. Be aware of the dangers  
of inhaling the engine’s exhaust fumes.  
Always ensure you have a safe and stable working  
position.  
Do not use the machine in bad weather, such as dense  
fog, rain, strong wind, intense cold, etc. Working in bad  
weather is tiring and often brings added risks, such as icy  
ground.  
WARNING! Overexposure to vibration can  
lead to circulatory damage or nerve damage  
in people who have impaired circulation.  
!
Never start to work with the power cutter before the  
working area is clear and you have a firm foothold. Look  
out for any obstacles with unexpected movement. Ensure  
when cutting that no material can become loose and fall,  
causing operating injury.Take great care when working on  
sloping ground.  
Contact your doctor if you experience  
symptoms of overexposure to vibration.  
These 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.  
Make sure that no pipes or electrical cables are routed in  
the area to be cut.  
Look around you:  
Use and care  
-To ensure that people, animals or other things cannot affect  
your control of the machine.  
A power cutter is designed to cut hard materials, such as  
masonry. Observe the increased risk of kickback when  
cutting soft materials. See instructions under the heading  
How to avoid kickback.  
-To make sure that none of the above come into contact with  
the blades.  
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.  
WARNING! Only use the machine in areas  
with good ventilation. Neglect can result in  
serious injury or death.  
!
Never use a machine that has been modified in any way  
from its original specification.  
WARNING!The safety distance for the power  
cutter is 15 metres.You are responsible to  
ensure that animals and onlookers are not  
within the working area. Do not start cutting  
until the working area is clear and you are  
standing firmly.  
!
The guards for the cutting equipment must always be  
fitted when the machine is running.  
Never move the machine when the cutting equipment is  
rotating.  
Transport and storage  
Store the power cutter in a lockable area so that it is out of  
reach of children and unauthorised persons.  
Inspect new blades for transport or storage damage.  
6 – English  
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SAFETY INSTRUCTIONS  
Fuel safety  
Machine s safety equipment  
This section describes the machines safety equipment, its  
purpose, and how checks and maintenance should be carried  
out to ensure that it operates correctly. See the ”What is  
what?” section to locate where this equipment is positioned  
on your machine.  
(Refuelling/Fuel mixture/Storage.)  
WARNING! Take care when handling fuel.  
Bear in mind the risk of fire, explosion and  
inhaling fumes.  
WARNING! Never use a machine that has  
faulty safety equipment! Carry out the  
inspection, maintenance and service  
routines listed in this section.  
!
!
Never refuel the machine while the engine is running.  
Make sure there is plenty of ventilation when refuelling or  
mixing fuel (gasoline and 2-stroke oil).  
Vibration damping system  
Your machine is equipped with a vibration damping system  
that is designed to reduce vibration and make operation  
easier.  
Move the machine at least 10 ft (3 m) from the refuelling  
point before starting it.  
The machine’s vibration damping system reduces the transfer  
of vibration between the engine unit/cutting equipment and  
the machine’s handle unit.  
The engine body, including the cutting equipment, is insulated  
from the handles by vibration damping units.  
Never start the machine:  
- If you have spilled fuel on it.Wipe off the spillage and allow  
remaining fuel to evaporate.  
- If you have spilled 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.  
Stop switch  
- If the machine is leaking fuel. Check regularly for leaks  
from the fuel cap and fuel lines.  
Use the stop switch to switch off the engine.  
Store and transport the machine and fuel so that there is  
no risk of any leakage or fumes coming into contact with  
sparks or naked flames, for example, from electrical  
machinery, electric motors, electrical relays/switches or  
boilers.  
Always store fuel in an approved container designed for  
that purpose.  
When storing the machine for long periods the fuel tank  
must be emptied.Contact your local gas station to find out  
where to dispose of excess fuel.  
Muffler  
WARNING! Bear in mind the risk of fire,  
explosion and inhaling fumes. Stop the  
engine before fuelling. Do not fill so that the  
fuel runs over. Wipe up all spillage on the  
ground and machine. If you spill fuel on  
yourself or your clothes. Change your  
clothes. Move the machine at least 3 metres  
away from the refuelling area before starting.  
WARNING! The muffler gets very hot in use  
and remains so for a short time afterwards.  
Do not touch the muffler if it is hot!  
!
!
The muffler is designed to keep noise levels to a minimum  
and to direct exhaust fumes away from the user.  
English – 7  
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SAFETY INSTRUCTIONS  
CAUTION! Never use a machine that has a faulty muffler.  
Checking,maintaining and servicing  
the machine s safety equipment  
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!  
!
WARNING! All servicing and repair work on  
the machine requires special training.This is  
especially true of the machine s safety  
!
equipment. If your machine fails any of the  
checks described below you must contact  
your service agent.When you buy any of our  
products we guarantee the availability of  
professional repairs and service. If the  
retailer who sells your machine is not a  
servicing dealer, ask him for the address of  
your nearest service agent.  
IMPORTANT! For mufflers it is very important that you  
follow the instructions on checking, maintaining and  
servicing your machine.See instructions under the heading  
Checking, maintaining and servicing the machine’s safety  
equipment.  
WARNING! The inside of the muffler contain  
chemicals that may be carcinogenic. Avoid  
contact with these elements in the event of a  
!
Vibration damping system  
damaged muffler.  
Throttle lockout  
Regularly check the vibration damping units for cracks or  
deformation.  
The throttle trigger lock is designed to prevent accidental  
operation of the throttle. When the lock (A) is pressed in this  
releases the throttle (B).  
A
Make sure the vibration damping units are securely attached  
to the engine unit and handle unit.  
B
The trigger lock remains pressed in as long as the throttle is  
pressed. When the grip on the handle is released, both the  
throttle and throttle lockout return to their original positions.  
This should be done via two, independent return spring  
systems.This position means that the throttle is automatically  
locked to idling and unintentional activation of this is  
prevented.  
Stop switch  
Start the engine and make sure the engine stops when you  
move the stop switch to the stop setting.  
Protection for the blades  
Muffler  
Never use a machine that has a faulty muffler.  
WARNING! Always check that the blade  
guards are correctly fitted before starting the  
machine.  
!
These guards are fitted above and below the blades and are  
designed to prevent parts of the blades or cut material from  
being thrown towards the user.  
Regularly check that the muffler is securely attached to the  
machine.  
8 – English  
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SAFETY INSTRUCTIONS  
Throttle lockout  
Diamond blades  
Make sure the throttle control is locked at the idle setting  
when the throttle lockout is released.  
WARNING! Blades can break and cause  
serious injuries to the user.  
!
Never use blades other than original blades  
designed for the machine.  
Never use blades on a material other than  
the one they are intended for.  
Press the throttle lockout and make sure it returns to its  
original position when you release it.  
WARNING! Cutting plastics with diamond  
blades can cause kickback when the  
material melts, due to the heat produced  
when cutting, and sticks to the blades. Avoid  
cutting plastics.  
!
Check that the throttle control and throttle lockout move  
freely and that the return springs work properly.  
General  
Only use special diamond blades with integrated belt pulley  
halves on this machine.  
Diamond blades consist of a steel body provided with  
segments that contain industrial diamonds.  
Start the power cutter and apply full throttle. Release the  
throttle and check that the blades stop and remain at a  
standstill.If the blades rotate when the throttle is in the idle  
position you should check the carburettor’s idle  
adjustment. See instructions under the heading  
Maintenance.  
Always use a sharp diamond blade.  
Ensure the blades are not cracked or damaged in any other  
way. Replace blades if necessary.  
Checking the blade guards  
Never use a defective guard or a guard that has not been  
fitted correctly.  
Water cooling  
Water cooling must always be used.This cools the blades and  
increases their life and prevents dust build-up.  
WARNING! Always check that the guards are  
correctly fitted before starting the machine.  
WARNING! Cool diamond blades designed  
for wet cutting continuously with water to  
prevent heating, which can deform the  
diamond blade resulting in damage to the  
machine and personal injury.  
!
!
Also check that the blades are fitted  
correctly and are not damaged in anyway.  
Damaged blades can cause personal  
injuries. See instructions under the heading  
Assembly.  
English – 9  
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SAFETY INSTRUCTIONS  
Blade vibrations  
General working instructions  
The blades can become out of true and vibrate if a too high  
feed pressure is used.  
A lower feed pressure can stop the vibration. Otherwise  
replace the blades. See the instructions under the heading  
Assembling the blades.  
IMPORTANT!This section describes basic safety directions  
for using a power cutter. 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 dealer, service agent or an  
experienced power cutter user.Do not attempt any task that  
you feel unsure of!  
The blades shall be intended for the material to be cut.  
Material  
Diamond blades are ideal for masonry, reinforced concrete  
and other composite materials. Diamond blades are not  
recommended for cutting metal.  
Diamond blades are available in several hardness classes.  
The blades shall be intended for the material to be cut. A  
"soft" diamond blade has a relatively short service life and  
large cutting capacity. It is used for hard materials such as  
granite and hard concrete. A "hard" diamond blade has a  
longer service life and reduced cutting capacity, and should  
be used for soft materials such as brick and asphalt.  
Water cooling  
Water cooling must always be used.This cools the blades and  
increases their life and prevents dust build-up.  
There is a restrictor in the water hose that reduces the water  
flow.  
Sharpening diamond blades  
Diamond blades can become dull when the wrong feeding  
pressure is used or when cutting certain materials such as  
heavily reinforced concrete. Working with a blunt diamond  
blade causes overheating, which can result in the diamond  
segments coming loose.  
At a low water pressure, for example when the water tank is  
used, the restrictor can be dismantled to give the correct  
water flow.  
Sharpen the blade by cutting in a soft material such as  
sandstone or brick.  
CAUTION! It is important not to use a too high water flow  
without throttling as the belt can then slip.  
High speed handheld machines  
Cutting technique  
Only use special blades with integrated belt pulley halves on  
this machine.  
Support the work piece in such a way that it is possible to  
predict what will happen, and so that the cut remains open  
while cutting.  
The blades should be marked with the same or a higher  
speed than that stated on the machine’s rating plate. Never  
use blades at a lower speed rating than that of the power  
cutter.  
Always hold the machine in a firm grip with both hands.  
Hold it so that the thumbs and fingers grip round the  
handles.  
Check that the blades are not in contact with anything  
when the machine is started.  
Start cutting with the machine running at maximum  
speed.  
Start cutting gradually, let the machine work without  
forcing or pressing the blades. Always cut at maximum  
speed.  
10 – English  
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SAFETY INSTRUCTIONS  
Cut in the same direction when cutting into an existing cut.  
The blade guards are designed to easily adapt to how  
Avoid cutting at an angle to the previous cut otherwise  
there is a risk of the blade jamming or that the machine  
can ”climb in the cut”.  
deep in the work piece the power cutter is moved.  
WARNING! Do not pull the power cutter to  
one side, this can cause the blades to jam or  
break resulting in personal injury.  
!
Always cut from top to bottom (A). Remove the cutter and  
use a crowbar to remove the material that remains  
between the cut (B).  
Kickback  
Kickback is a sudden, rearward motion of the saw that can  
occur if the blades are stalled (pinched, jammed, twisted) in  
the so called kickback zone. Most kickbacks are small and felt  
as small ”jerks” in the front handle. However, kickback can be  
very powerful. If you are not paying attention or have a poor  
grip the saw can be thrown all the way back at you.  
WARNING! Kickback can be very sudden  
and viloent, throwing the saw back at you. It  
can cause serious or even fatal injuries. It is  
vital you understand what causes kickback  
and how to aviod it using proper cutting  
techique.  
!
Follow the same saw cut, but further in the work piece (C),  
and repeat the work with the crowbar.  
Cause of kickback  
Kickback is caused if you are cutting with the kickback zone  
of the blade for example when cutting ”upwards” or towards  
you.  
WARNING! When cutting vertically, always  
cut from the top of the cut and down. Never  
cut from the bottom of the cut and up.This  
can cause a kickback and result in personal  
injury.  
!
Repeat this working method until the required cutting  
depth is achieved (D, E).  
English – 11  
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SAFETY INSTRUCTIONS  
General rules  
Never cut upwards or towards you so that the kickback  
zone becomes actively cutting.  
Always hold the machine in a firm grip with both hands.  
Hold it so that the thumbs and fingers grip round the  
handles.  
Keep a good balance and a firm foothold.  
When cutting vertically, always cut from the top of the cut  
and down.  
Always cut at full throttle.  
Do not cut with the upper quadrant (kickback zone) of the  
blade. Avoid twisting or pushing the blades sideways in  
the cut. This can cause kickback.  
Take care when inserting the blade in an existing cut.  
Make certain that the cut is wide enough and that the  
blades are not angled in the cut.This can cause kickback.  
Stand at a comfortable distance from the work piece.  
Never cut above shoulder height.  
Never cut from a ladder. Use a platform or scaffold when  
working at high altitude.  
Be on the alert in case the work piece moves or anything  
else occurs, which could cause the cut to close and the  
blades to jam.  
Pull in  
Pull in occurs when the blades’ lower sections suddenly stop  
or when the cut closes. (To avoid, see the instructions under  
the heading ”Basic rules” and ”Jamming/rotation”, here  
below.).  
Pinching/rotation  
If the cut is pressed together this can lead to jamming. The  
machine can be pulled down suddenly with a very powerful  
jerk.  
How to avoid pinching  
Support the work piece in such a way that the cut remains  
open during the cutting operation and when the cut is  
finished.  
Check the engine speed  
Use a revolution counter regularly to check the engine speed  
at the working temperature, at full throttle and without a load.  
12 – English  
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ASSEMBLY  
Assembling the blades  
Protection for the blades  
The guards should always be fitted on the machine.  
Check that the guards are properly secured and work  
before starting to cut.  
Husqvarna blades are especially manufactured and approved  
for freehand cutting with the K650 Cut-n-Break. The blades  
have integrated belt pulley halves and are to be changed in  
pairs.  
Loosen the bar nuts, unscrew the clamping screw  
anticlockwise a few turns and then refit the bar as far as it  
will go before you dismantle the old blades. This will  
position the drive belt in a more favourable position with  
regard to assembling the new blades. The drive belt is  
not clamped so easily.  
Dismantle the old blades by loosening the centre nut.  
Check the drive belt for wear when the blades are  
dismantled. When changing the drive belt see the  
instructions under the heading ”Replacing the drive belt”.  
Position the blades on each side of the cutting arm. Make  
sure that the holes for both guide pins in the drive belt  
halves are aligned so that they correspond with the holes  
in the washer, and the nut too. Now fit the bolt and washer  
unit with guide pins.  
CAUTION! It is very important that the blades rotate when  
the nut is tightened. This is to ensure that the belt is not  
clamped between the integrated drive belt halves on the  
blades when the blades/drive belt are pulled together with  
the nut. Ideally this is done alternately, i.e. tighten a little,  
rotate a little and repeat until the blades are secured.  
IMPORTANT! Do not forget to tighten the belt and check the  
belt adjustment before cutting. See the instructions under  
the heading ”Inspecting and adjusting the drive belt”.  
English – 13  
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FUEL HANDLING  
Mix (shake) the fuel mixture thoroughly before filling the  
machine’s fuel tank.  
Fuel  
CAUTION!The machine is equipped with a two-stroke engine  
and must always been run using a mixture of gasoline and  
two-stroke engine 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.  
!
Do not mix more than one month’s supply of fuel at a time.  
Gasoline  
If the machine is not used for some time the fuel tank  
should be emptied and cleaned.  
The lowest octane recommended is 87 ((RON+MON)/2). If  
you run the engine on a lower octane than 87 it can result in  
knocking.This gives rise to a high engine temperature, which  
can result in serious engine damage.  
Fueling  
Two-stroke oil  
WARNING!Taking the following precautions,  
will lessen the risk of fire:  
For best results and performance use HUSQVARNA two-  
stroke engine oil, which is specially formulated for our air-  
cooled two stroke-engines.  
!
Do not smoke and do not place any hot  
objects in the vicinity of fuel.  
Never use two-stroke oil intended for water-cooled  
engines, sometimes referred to as outboard oil (rated  
TCW).  
Always shut off the engine before refuelling.  
When refuelling, open the fuel cap slowly so  
that any excess pressure is released gently.  
Never use oil intended for four-stroke engines.  
Tighten the fuel cap carefully after refuelling.  
Mixing ratio  
Always move the machine away from the  
refuelling area before starting.  
1:50 (2%) for all engines.  
Gasoline, litre  
Two-stroke oil, litre  
2% (1:50)  
0,10  
Keep the handle dry and free from oil and fuel.  
Ensure that the fuel is well mixed by shaking the container  
before filling the tank.  
5
10  
0,20  
Always exercise care when refilling the fuel. Move the  
machine at least three metres from the fuelling area  
before it is started. Check that the fuel cap is tightened  
correctly.  
15  
0,30  
20  
0,40  
US gallon  
US fl. oz.  
2 1/2  
1
2 1/2  
5
6 1/2  
12 7/8  
Mixing  
Always mix the gasoline and oil in a clean container  
intended for fuel.  
Clean around the fuel cap. Clean the fuel and oil tank  
regularly.The fuel filter should be changed at least once a  
year. Contamination in the tanks causes malfunction.  
Always start by filling half the amount of the gasoline to be  
used. Then add the entire amount of oil. Mix (shake) the  
fuel mixture. Add the remaining amount of gasoline.  
14 – English  
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STARTING AND STOPPING  
Starting a warm engine  
Before starting  
Use the same starting procedure as for a cold engine but  
without setting the choke control in the choke position.  
WARNING! Note the following before  
starting:  
!
Do not start the power cutter without the  
clutch cover fitted. Otherwise the clutch  
could come loose and cause personal  
injuries.  
Always move the machine away from the  
refuelling area before starting.  
Ensure that you and the machine have a  
good working stance and that the blades can  
rotate freely.  
Starting  
WARNING! The blades rotate when the  
engine is started. Make sure they can rotate  
freely.  
Keep people and animals well away from the  
working area.  
!
Grip the front handle with your left hand. Put your right foot on  
the lower section of the rear handle pressing the machine  
against the ground. Never wrap the starter cord around  
your hand  
Water connector  
Connect the water hose to the water supply.The water flow is  
regulated using the water tap.  
Starting a cold engine  
Decompression valve: Press in the valve to reduce the  
pressure in the cylinder, this is to assist starting the power  
cutter. The decompression valve (A) should always be used  
when starting. The valve automatically returns to its initial  
position when the machine starts.  
Grip the starter handle, slowly pull out the cord with your right  
hand until you feel some resistance (the starter pawls grip),  
now quickly and powerfully pull the cord.  
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.  
When the engine starts, quickly apply full throttle to  
automatically disengage fast idle.  
Start throttle lock: Press in the throttle trigger lock, throttle  
control and then the start throttle lock (B).Release the throttle  
control and it is locked in the half throttle position. The lock  
releases when the throttle control is pressed in fully.  
Stopping  
The engine is stopped by switching the ignition off using the  
stop switch.  
Ignition: Set the stop switch to the start position.  
Choke: Pull the choke control fully out.  
English – 15  
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MAINTENANCE  
Remove the blades.  
Inspecting and adjusting the drive  
belt  
The drive belt is fully enclosed and well-protected from  
dust, dirt and mechanical damage when cutting.  
Check the drive belt adjustment by feeling with your  
fingers as illustrated. A correctly adjusted drive belt  
should have about 5 mm of movement.  
Remove the clutch cover by loosening the screws A and  
B.  
Remove the drive belt from the nose of the cutting arm  
(C).  
To adjust the drive belt, loosen both the screws (A) holding  
the bar one turn anticlockwise.  
Turn the adjuster screw (B) clockwise at the same time as  
you feel with your fingers how the drive belt is adjusted.  
When there is about 5 mm of movement on the drive belt  
this is adjusted correctly and you can then tighten both  
screws holding the bar.  
IMPORTANT! A new drive belt must be readjusted after one  
or two tanks of fuel have been used.  
Loosen water hose (E).Slide back the bar and remove the  
drive belt around the clutch (D).  
Replacing the drive belt  
Release the belt tension.  
16 – English  
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MAINTENANCE  
Pull off the cutting arm by pulling it straight forwards, as  
illustrated.  
Refit the blades and tighten the nut. See instructions  
under Heading ”Assembling the blades”.  
CAUTION! Make sure that the belt adjuster screw bottoms  
and that the bar is fully screwed back so that the belt cover fits  
correctly.  
Belt pulley and clutch  
Never start the engine when the belt pulley and clutch have  
been removed.  
Carburetor  
Your Husqvarna product has been designed and  
manufactured to specifications that reduce harmful  
emissions.  
Remove the complete drive belt (D).  
Function  
Loosen the six screws (F) holding the guards on the  
cutting arm.  
The carburettor governs the engine speed via the throttle. Air  
and fuel are mixed in the carburettor.  
WARNING! Do not start the machine without  
the cutting arm or cutting head fitted.  
Otherwise the clutch could come loose and  
cause personal injuries.  
!
Needles  
The carburettor is equipped with fixed needles to ensure the  
machine always receives the correct mixture of fuel and air.  
When the engine lacks power or accelerates poorly, do the  
following:  
Check the air filter and replace if necessary.  
When this does not help, contact an authorised service  
workshop.  
Fit the new drive belt (K).  
Refit the guards and belt cover.  
Fine adjustment of the idle speed T  
The bar (M) must be positioned on plate (L) so that the  
holes in the plate align with the holes in the bar.  
H
L
T
The edges of the plate (J) must lie inside the edges of the  
plate (L).  
Tight the six screws (F) and check/adjust the drive belt’s  
(K) tension. See the instructions under the heading  
”Inspecting and adjusting the drive belt”.  
Adjust the idle speed using the T screw. If adjustment is  
necessary, rst turn the idle screw clockwise until the blades  
start to rotate. Now turn the screw anticlockwise until the  
blades stop rotating. A correctly adjusted idle speed is set  
when the engine accelerates without hesitation.  
The movement limiters (G) are fitted last. Clamp together  
the plates as illustrated.  
Rec. idle speed: 2500 rpm  
G
G
WARNING! If the idle speed cannot be  
adjusted so that the cutting attachment  
stops, contact your dealer/service  
workshop. Do not use the machine until it  
has been correctly adjusted or repaired.  
!
English – 17  
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MAINTENANCE  
off the excess before fitting the filter to the machine.Never  
use common engine oil.This would drain through the filter  
quite quickly and collect in the bottom.  
Air filter  
Air filters must be regularly cleaned to remove dust and dirt in  
order to avoid:  
Carburettor malfunctions  
Starting problems  
Less power  
A foam plastic filter that has been washed many times  
wears.Replace with a new filter if it is not elastic and seals  
well against the filter cover.  
Unnecessary wear to engine parts  
Excessive fuel consumption.  
The paper filter is accessible under cover B. This filter  
must be replaced/cleaned when the engine’s power drops  
or after one-two weeks. Note that the filter must not be  
washed.  
The air filter system consists of an oiled foam plastic filter (1)  
and a paper filter (2):  
An air filter that has been in use for a long time cannot be  
cleaned completely.The filter must therefore be replaced with  
a new one at regular intervals. A damaged air filter must  
always be replaced.  
The foam plastic filter is easily accessible under the filter  
cover A. This filter should be checked weekly and  
replaced if necessary. In order to obtain a good filtering  
effect, the filter must be replaced regularly or cleaned and  
oiled. A special HUSQVARNA oil has been produced for  
this purpose.  
IMPORTANT! Poor maintenance of the air filter will cause  
carbon build-up on the spark plug and abnormal wear to  
engine parts.  
Fuel filter  
The fuel filter sits inside the fuel tank.  
The fuel tank must be protected from contamination when  
filling. This reduces the risk of operating disturbances  
caused by blockage of the fuel filter located inside the  
tank.  
The filter cannot be cleaned but must be replaced with a  
new filter when it is clogged. The filter should be  
changed at least once per year.  
Remove the foam plastic filter.Wash the filter well in tepid  
soapy water. After cleaning, rinse the filter well in clean  
water. Squeeze out and allow the filter to dry. NOTE! High  
pressure compressed air can damage the foam.  
Water tap  
Oil the foam plastic filter well.It is extremely important that  
the entire filter is saturated with oil.  
Put the filter in a plastic bag and pour the filter oil over it.  
Knead the plastic bag to distribute the oil. Squeeze the  
excess oil out of the filter inside the plastic bag and pour  
Water filter  
Check and clean the restrictor if necessary.  
18 – English  
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MAINTENANCE  
Secure the starter cord around the cord pulley as  
Starter  
illustrated. Tighten the fastening well and ensure that the  
free end is as short as possible. Secure the end of the  
starter cord in the starter handle.  
WARNING! When the recoil spring is wound  
up in the starter housing it is under tension  
and can, if handled carelessly, pop out and  
cause personal injury.  
!
Always be careful when changing the recoil  
spring or the starter cord. Always wear  
protective goggles.  
Guide the cord through the cut-out in the periphery of the  
pulley and wind the cord 3 times clockwise around the  
centre of the starter pulley.  
Changing a broken or worn starter cord  
Loosen the filter and cylinder cover.  
Loosen the screws that hold the starter against the  
crankcase and remove the starter.  
Now pull the starter handle and in doing so tension the  
spring. Repeat the procedure once more, but this time  
with four turns.  
Note that the starter handle is drawn to its correct home  
position after tensioning the spring.  
Check that the spring is not drawn to its end position by  
pulling out the starter line fully. Slow the starter pulley with  
your thumb and check that you can turn the pulley at least  
a further half turn.  
Tensioning the recoil spring  
Pull out the cord approx. 30 cm (12 inches) and hook it  
into the notch in the rim of the pulley. Release the recoil  
spring by letting the pulley rotate slowly backwards.  
Hook the starter cord in the notch in the pulley and turn  
the starter pulley about 2 turns clockwise.  
Remove any remnants of the old starter cord and check  
that the return spring works. Insert the new starter cord  
through the hole in the starter housing and in the cord  
pulley.  
CAUTION! Check that the pulley can be turned an  
additional 1/2 turn when the starter cord is pulled all the  
way out.  
English – 19  
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MAINTENANCE  
Changing a broken recoil spring  
Spark plug  
Undo the bolt in the centre of the pulley and remove the  
pulley.  
The spark plug condition is influenced by:  
Incorrect carburetor adjustment.  
Wrong fuel mixture (too much oil).  
A dirty air filter.  
Bear in mind that the return spring lies tensioned in the  
starter housing.  
Loosen the bolts holding the spring cassette.  
These factors cause deposits on the spark plug electrodes,  
which may result in operating problems and starting  
difficulties.  
Remove the recoil spring by turning the starter over and  
loosen the hooks, with the help of a screwdriver. The  
hooks hold the return spring assembly on the starter.  
Lubricate the recoil spring with light oil. Fit the pulley and  
tension the recoil spring.  
If the machine is low on power, difficult to start or runs  
poorly at idle speed: always check the spark plug first  
before taking any further action. If the spark plug is dirty,  
clean it and check that the electrode gap is 0.020 inch (0.5  
mm). The spark plug should be replaced after about a  
month in operation or earlier if necessary.  
Fitting the starter  
To t the starter, first pull out the starter cord and place the  
starter in position against the crankcase. Then slowly  
release the starter cord so that the pulley engages with  
the pawls.  
CAUTION! Always use the recommended spark plug type!  
Use of the wrong spark plug can damage the piston/cylinder.  
Assemble the starter and tighten the screws.  
Fit the cylinder cover and filter cover.  
20 – English  
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MAINTENANCE  
Cooling system  
General maintenance instructions  
To keep the working temperature as low as possible the  
machine is equipped with a cooling system.  
The cooling system consists of:  
Below you will find some general maintenance instructions. If  
you have more questions, contact your service agent.  
Daily maintenance  
1
Check that the components of the throttle control work  
smoothly (throttle control and throttle trigger lock).  
2
3
4
5
6
Clean the outside of the machine.  
Check the tension of the drive belt.  
Check the condition of the blades and the drive gear.  
Check the condition of the blade guards.  
Check the starter and starter cord and clean the outside  
of the starter unit’s air intake.  
1
2
3
4
5
Air intake on the starter.  
Air guide plate.  
7
8
9
Check that nuts and screws are tight.  
Check that the stop switch works correctly.  
Check the function of the restrictor.  
Fins on the flywheel.  
Cooling fins on the cylinder.  
Cylinder cover (directs cold air over the cylinder).  
Weekly maintenance  
Clean the cooling system with a brush once a week, more  
often in demanding conditions. A dirty or blocked cooling  
system results in the machine overheating which causes  
damage to the piston and cylinder.  
10 Check the condition of the air filter.  
11 Check that the handles and vibration damping elements  
are not damaged.  
12 Clean the spark plug. Check that the electrode gap is  
0.020 inch (0.5 mm).  
Muffler  
13 Clean the fins on the flywheel. Check the starter and the  
recoil spring.  
14 Clean the cooling fins on the cylinder.  
The muffler is designed to reduce the noise level and to direct  
the exhaust gases away from the operator. The exhaust  
gases are hot and can contain sparks, which may cause fire  
if directed against dry and combustible material.  
15 Check that the muffler is securely attached and not  
damaged.  
16 Check the operation of the carburettor.  
Monthly maintenance  
17 Check the clutch centre, drive gear and clutch spring for  
wear.  
18 Clean the outside of the carburetor.  
19 Check fuel hose for cracks or other damage. Change if  
necessary.  
20 Clean the inside of the fuel tank.  
Never use a machine with a defective muffler.  
English – 21  
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TECHNICAL DATA  
Technical data  
K650 Cut-n-break  
Engine  
3
Cylinder displacement, cu.in/cm  
Cylinder bore, inch/mm  
Stroke, inch/mm  
71  
1,97/50  
1,42/36  
2500  
Idle speed, rpm  
Recommended max. speed, rpm  
Power, kW  
9750 (+/- 250)  
3,5  
Ignition system  
Manufacturer of ignition system  
EM  
Champion RCJ 6Y/  
NGK BPMR 7A  
Spark plug  
Electrode gap, inch/mm  
0,02/0,5  
Fuel and lubrication system  
Manufacturer of carburetor  
Tillotson  
W CAT: 5,7  
0,7  
Carburetor type  
Fuel tank capacity, US pint/litre  
Weight  
Weight, including water kit, without fuel and cutting attachment, kg  
Weight, including water kit with fuel and with cutting attachment, kg  
Noise emissions  
8,9  
10,3  
(see note 1)  
Sound power level, measured dB(A)  
115  
116  
Sound power level, guaranteed L  
Sound levels  
dB(A)  
WA  
(see note 2)  
Equivalent sound pressure level at the operator’s ear, measured  
according to EN 1454 dB(A)  
100  
Vibration levels  
Handle vibrations measured according to ISO 19432  
2
Front handle, equivalent value, m/s  
3,2  
2
Rear handle, equivalent value, m/s  
12,6/5,7  
Cutting equipment  
Cutting blade  
Gear ratio Max. peripheral speed, m/s  
48/79 80  
Max cutting depth  
400 mm  
9”  
Max. blade speed, rpm  
6200  
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22 – English  
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FEDERAL EMISSION CONTROL WARRANTY STATEMENT  
regarding your warranty rights and responsibilities, you  
should contact your nearest authorized servicing dealer or  
YOUR WARRANTY RIGHTS AND  
call Husqvarna Construction Products, at 1-800-323 3553.  
OBLIGATIONS  
WARRANTY PERIOD Any warranted part which is not  
scheduled for replacement as required maintenance, or  
The EPA (The US Environmental Protection Agency),  
Environment Canada and Husqvarna Construction Products  
which is scheduled only for regular inspection to the effect of  
are pleased to explain the emissions control system warranty  
“repair or replace as necessary” shall be warranted for 2  
on your 2001 and later small nonroad engine. In U.S. and  
years.Any warranted part which is scheduled for replacement  
Canada, new small nonroad engines must be designed, built  
as required maintenance shall be warranted for the period of  
and equipped to meet the federal stringent anti-smog  
time up to the first scheduled replacement point for that part.  
standards. Husqvarna Construction Products must warrant  
the emission control system on your small nonroad engine for  
the period of time listed below provided there has been no  
abuse, neglect or improper maintenance of your unit.Your  
emmission control system includes Parts such as the  
carburetor and the ignition system. Where a warrantable  
condition exists, Husqvarna Construction Products will repair  
your small nonroad engine at no cost to you. Expenses  
covered under warranty include diagnosis, parts and labor.  
DIAGNOSIS The owner shall not be charged for diagnostic  
labor which leads to the determination that a warranted part  
is defective, if the diagnostic work is performed at an  
approved Husqvarna Construction Products servicing dealer.  
CONSEQUENTIAL DAMAGES Husqvarna Construction  
Products may be liable for damages to other engine  
components caused by the failure of a warranted part still  
under warranty.  
MANUFACTURER S WARRANTY  
COVERAGE  
WHAT IS NOT COVERED  
All failures caused by abuse, neglect or improper  
maintenance are not covered.  
The 2001 and later small nonroad engines are warranted for  
two years. If any emission related part on you engine (as  
listed above) is defective, the part will be repaired or replaced  
by Husqvarna Construction Products.  
ADD -ON OR MODIFIED PARTS  
The use of add-on or modified parts can be grounds for  
disallowing a warranty claim. Husqvarna Construction  
Products is not liable to cover failures of warranted parts  
caused by the use of add-on or modified parts.  
OWNER S WARRANTY  
RESPONSIBILITIES  
As the small nonroad engine owner, you are responsible for  
the performance of the required maintenance listed in your  
Operators Manual. Husqvarna Construction Products  
recommends that you retain all receipts covering  
HOW TO FILE A CLAIM  
If you have any questions regarding your warranty rights and  
responsibilities, you should contact your nearest authorized  
servicing dealer or call Husqvarna Construction Products, at  
1-800-323 3553.  
maintenance on your small nonroad engine, but Husqvarna  
Construction Products cannot deny warranty solely for the  
lack of receipts or for your failure to ensure the performance  
of all scheduled maintenance. As the small nonroad engine  
owner, you should, however, be aware that Husqvarna  
Construction Products may deny you warranty coverage if  
your small nonroad engine or a part of it has failed due to  
abuse, neglect, improper maintenance, unapproved  
modifications or the use of parts not made or approved by the  
original equipment manufacturer.You are responsible for  
presenting your small nonroad engine to a Husqvarna  
Construction Products authorized servicing dealer as soon as  
a problem exists. The warranty repairs should be completed  
in a reasonable amount of time, not to exceed 30 days. If you  
have any questions regarding your warranty rights and  
responsibilities, you should contact your nearest authorized  
servicing dealer or call Husqvarna Construction Products, at  
1-800-323 3553.  
WHERE TO GET WARRANTY SERVICE  
Warranty services or repairs shall be provided at all  
Husqvarna Construction Products authorized servicing  
dealers.  
MAINTENANCE, REPLACEMENT AND  
REPAIR OF EMISSION-RELATED PARTS  
Any Husqvarna Construction Products approved  
replacement part used in the performance of any warranty  
maintenance or repairs on emission-related parts, will be  
provided without charge to the owner if the part is under  
warranty.  
WARRANTY COMMENCEMENT DATE  
EMISSION CONTROL WARRANTY PARTS  
LIST  
The warranty period begins on the date small nonroad engine  
is delivered.  
1
2
3
4
Carburetor and internal parts  
LENGTH OF COVERAGE  
Intake pipe, airfilter holder and carburetor bolts.  
Airfilter and fuelfilter covered up to maintenance schedule.  
Ignition System  
Husqvarna Construction Products warrants to the initial  
owner and each subsequent purchaser that the engine is free  
from defects in materials and workmanship which cause the  
failure of a warranted part for a period of two years.  
1
2
Spark Plug, covered up to maintenance schedule  
Ignition Module  
WHAT IS COVERED  
REPAIR OR REPLACEMENT OF PARTS Repair or  
replacement of any warranted part will be performed at no  
charge to the owner at an approved Husqvarna Construction  
Products servicing dealer. If you have any questions  
MAINTENANCE STATEMENT  
The owner is responsible for the performance of all required  
maintenance, as defined in the operator’s manual.  
English – 23  
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WARNING! Cutting, especially when DRY  
cutting, generates dust that comes from the  
material being cut, which frequently  
contains silica. Silica is a basic component  
of sand, quartz, brick clay, granite and  
numerous other minerals and rocks.  
Exposure to excessive amount of such dust  
can cause:  
!
Respiratory disease (affecting your ability to  
breath), including chronic bronchitis,  
silicosis and pulmonary fibrosis from  
exposure to silica.These diseases may be  
fatal;  
Skin irritation and rash.  
Cancer according to NTP* and IARC*  
*/ NationalToxicology Program, International  
Agency for Resaearch on Cancer  
Take precautionary steps:  
Avoid inhalation of and skin contact with  
dust, mist and fumes.  
Wear and ensure that all bystanders wear  
appropriate respiratory protection such as  
dust masks designed to filter out  
microscopic particles. (See OSHA 29 CFR  
Part 1910.1200)  
Wet cut when feasible, to minimize dust.  
1151464-95  
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2009-01-10  
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