Husqvarna K970 User Manual

Oper ator’s manual

K 970 Ring

Please r ead the operator’s manual carefully and make sure you understand the

instructions before using the machine. It is the owner’s responsibility to make sure that

any persons who use this power cutter have read this manual!

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KEY T O SYMBOLS

Symbols on the mac hine

ARNING! The machine can be a
dangerous tool if used incorrectly or
carelessly, which can cause serious or
fatal injury to the operator or others.

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

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

WARNING! Dust forms when cutting, this
can cause injuries if inhaled. Use an
approved breathing mask. Avoid inhaling
petrol fumes and exhaust fumes. Always
provide for good ventilation.

WARNING! Kickbacks can be sudden,
rapid and violent and can cause life
threatening injuries. Read and understand
the instructions in the manual before using
the machine.

You will find the following labels on your power cutter:

The Emissions Compliance Period referred to on the
Emission Compliance label indicates the number of operating
hours for which the engine has been shown to meet Federal
and Californian emissions requirements.

WARNING! Sparks may appear and start a
fire when you work with the machine.

Choke

Air purge

Decompression valve

Refuelling, petrol/oil mix

The engine exhaust from this product
contains chemical known to the State

of California to cause cancer, birth

defects or other reproductive harm.

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

Explanation of warning le vels

The w arnings are graded in three levels.

ARNING!

ARNING! Used if there is a risk of serious

injury or death for the operator or damage to

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the surroundings if the instructions in the
manual are not followed.

CAUTION!

UTION! Used if there is a risk of injury to

the operator or damage to the surroundings

!

if the instructions in the manual are not
followed.

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NOTICE!

TICE! Used if there is a risk of damage to materials or
the machine if the instructions in the manual are not
followed.

English

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CONTENTS

Contents

KEY TO SYMBOLS

Symbols on the machine ............................................. 2

Explanation of warning levels ...................................... 2

CONTENTS

Contents ...................................................................... 3

PRESENT ATION

Dear customer! ............................................................ 4

Features ....................................................................... 4

WHA T IS WHAT?

What is what on the po wer cutter? ............................... 5

CHINE´S SAFETY EQUIPMENT

Gener al ........................................................................ 6

BLADES

Gener al ........................................................................ 8

Water cooling ............................................................... 8

Diamond blades for different materials ........................ 8

Sharpening diamond blades ........................................ 8

Vibrations on diamond blades ...................................... 8

Drive ............................................................................. 8

Transport and storage .................................................. 9

ASSEMBLING AND ADJUSTMENTS

Fitting the b lade ........................................................... 10

Water hose ................................................................... 11

FUEL HANDLING

Gener al ........................................................................ 12

Fuel .............................................................................. 12

Fueling ......................................................................... 12

Transport and storage .................................................. 12

OPERA TING

Protectiv e equipment ................................................... 14

General safety precautions .......................................... 14

Transport and storage .................................................. 17

ARTING AND STOPPING

Bef ore starting ............................................................. 18

Starting ........................................................................ 18

Stopping ....................................................................... 19

MAINTENANCE

Gener al ........................................................................ 20

Maintenance schedule ................................................. 20

Cleaning ....................................................................... 21

Functional inspection ................................................... 21

Reconstructing the blade ............................................. 26

OUBLE SHOOTING

roubleshooting schedule ............................................ 27

TECHNICAL D ATA

echnical data .............................................................. 28

Cutting equipment ........................................................ 28

FEDERAL EMISSION CONTR OL WARRANTY
STATEMENT

OUR WARRANTY RIGHTS AND OBLIGATIONS ..... 29

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English

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4

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PRESENT A TION

Dear customer!

Thank y ou for choosing a Husqvarna product!

It is our wish that you will be satisfied with your product and
that it will be your companion for a long time. A purchase of
one of our products gives you access to professional help with
repairs and services. If the retailer who sells your machine is
not one of our authorised dealers, ask him for the address of
your nearest service workshop.

This operator’s manual is a valuable document. Make sure it
is always at hand at the work place. By following its content
(using, service, maintenance etc) the life span and the
second-hand value of the machine can be extended. If you
ever lend or sell this machine, make sure that the borrower or
buyer gets the operator ′ s manual, so they will also know how
to properly maintain and use it.

More than 300 y ears of innovation

Husqv arna AB is a Swedish company based on a tradition
that dates back to 1689, when the Swedish King Charles XI
ordered the construction of a factory for production of
muskets. At that time, the foundation was already laid for the
engineering skills behind the development of some of the
world's leading products in areas such as hunting weapons,
bicycles, motorcycles, domestic appliances, sewing
machines and outdoor products.

Husqvarna is the global leader in outdoor power products for
forestry, park maintenance and lawn and garden care, as well
as cutting equipment and diamond tools for the construction
and stone industries.

User responsibility

It is the o wner’s/employer’s responsibility that the operator
has sufficient knowledge about how to use the machine
safely. Supervisors and operators must have read and
understood the Operator’s Manual. They must be aware of:

• The machine’s safety instructions.

• The machine’s range of applications and limitations.

• How the machine is to be used and maintained.

National legislation could regulate the use of this machine.
Find out what legislation is applicable in the place where you
work before you start using the machine.

Smar tCarb™

Built-in automatic fi lter compensation maintains high power
and reduces fuel consumption.

Dura Star ter™

Dust sealed star ter unit, where the return spring and the
pulley bearing are sealed which makes the starter virtually
maintenance free and even more reliable.

X-T orq®

The X-T orq® engine provides a more accessible torque for a
wider range of speeds which results in maximum cutting
capacity. X-Torq® reduces the fuel consumption with up to
20% and the emissions with up to 60%.

EasyStar t

The engine and star ter are designed to ensure quick and
easy starting of the machine. Reduces the pull resistance in
the starter cord with up to 40%. (Reduces the compression
during starting.)

Air pur ge

When y ou push the air purge diaphragm, fuel is pumped
through to the carburettor. Fewer pulls are required for
starting, meaning the machine becomes easier to start.

Effi cient vibration damping system

Effi cient vibration dampers spare arms and hands.

Lar ge cutting depth

Giv es a cutting depth of 260 mm (10”) which is double the
depth compared to traditional blades. Cuts can be made
efficiently from one side.

The man ufacturer’s reservation

All inf ormation and all data in the Operator’s Manual were
applicable at the time the Operator’s Manual was sent to print.

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

For customer assistance, contact us at our website:
www.usa.husqvarna.com

Features

alues such as high performance, reliability, innovative
technology, advanced technical solutions and environmental
considerations distinguish Husqvarna's products.

Some of the unique features of your product are described
below.

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English

WHA T IS WHA T?

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What is what on the po wer cutter?

Control for the guide rollers

2 Grease nipples

3 Blade guard/spray guard

4 Diamond blade

5 Locking button for the drive wheel

6 Water connection with filter

7 Fuel cap

8 Type plate

9 Adjuster screws

10 Cover screws

11 Decompression valve

12 Starter handle

13 Throttle lockout

14 Throttle trigger

15 Front handle

16 Water tap

17 Warning decal

18 Air filter cover

19 Choke

20 Rear handle

21 Stop switch

22 Air purge

23 Cylinder cover

24 Locking nuts for the support roller arms

25 Support rollers

26 Drive wheel

27 Guide rollers

28 Tool bag

29 Grease gun

30 6 mm hex key

31 Bearing grease

32 Water connector, GARDENA

®

Combination spanner, torx

34 Open-ended spanner, 19 mm

35 Operator’s manual

English

– 5

MA CHINE´S SAFETY EQ UIPMENT

6

•

•

•

General

WARNING! Never use a machine that has
faulty safety equipment! If your machine

!

fails any of these checks contact your
service agent to get it repaired.

The engine should be switched off, and the
stop switch in STOP position.

This section descr ibes the machine ′ s safety equipment, its
purpose, and how checks and maintenance should be carried
out to ensure that it operates correctly.

Thr ottle lockout

The throttle tr igger lock is designed to prevent accidental
operation of the throttle. When the lock (A) is pressed in this
releases the throttle (B).

• Start the power cutter and apply full throttle. Release the
throttle control and check that the cutting blade stops and
remains stationary. If the cutting blade rotates when the
throttle is in the idle position you should check the
carburettor’s idle adjustment. See instructions in the
section "Maintenance".

Stop s witch

Use the stop s witch to switch off the engine.

The trigger lock remains pressed in as long as the throttle is
pressed. When the grip on the handle is released the throttle
trigger and the throttle trigger lock both return to their original
positions. This is controlled by two independent return spring
systems. This means that the throttle trigger is automatically
locked in the idle position.

Chec king the throttle lockout

Make sure the throttle control is locked at the idle setting
when the throttle lockout is released.

• Press the throttle lockout and make sure it returns to its
original position when you release it.

Chec king the stop switch

Start the engine and make sure the engine stops when
you move the stop switch to the stop setting.

Blade guar ds

WARNING! Always check that the guard is
correctly fitted before starting the machine.

!

This guard is fi tted above the blade and is designed to prevent
parts of the blade or cutting fragments from being thrown
towards the user.

• Check that the throttle trigger and throttle lockout move
freely and that the return springs work properly.

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English

Chec k the blade guards

Check that the guard over the blade is not cracked or
damaged in any other way. Replace when damaged.

• Also check that the blade is fitted correctly and is not
damaged in anyway. A damaged blade can cause
personal injuries.

MACHINE´S SAFETY EQUIPMENT

Vibration damping system

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

!

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

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

• 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.

Inspecting the muffler

Check regularly that the muffler is complete and secured
correctly.

Checking the vibration damping system

WARNING! The engine should be switched
off, and the stop switch in STOP position.

!

• Check the vibration damping units regularly for cracks or
deformation. Replace them if damaged.

• Check that the vibration damping element is securely
attached between the engine unit and handle unit.

Muffler

WARNING! Never use a machine without a
muffler, or with a faulty muffler. A damaged

!

muffler may substantially increase the noise
level and the fire hazard. Keep fire fighting
equipment handy.

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

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

English – 7

BLADES

General

WARNING! Cutting plastics with a diamond
blade can cause kickback when the material

!

melts due to the heat produced when cutting
and sticks to the blade.

WARNING! Diamond blades get very hot
when used. An overheated blade is a result

!

of improper use, and may cause deformation
of the blade, resulting in damage and
injuries.

• Diamond blades consist of a steel core provided with
segments that contain industrial diamonds.

Water cooling

WARNING! Cool diamond blades for wet
cutting continuously with water to prevent

!

overheating, which may deform the blade
and cause damage to the blade and injury to
the user.

• Water cooling must always be used. When wet cutting, the
blade is continuously cooled to prevent overheating.

The flanges on the two guide rollers run in the blade’s groove.
Springs on the guide rollers press out the rollers, which in turn
press the V-shaped edge on the inside diameter of the blade
against the V-shaped groove in the drive wheel. The drive
wheel is fitted on an axle which is driven by the engine via a
drive belt.

This allows a total cutting depth of 260 mm (10 inches) with a
350 mm (14 inches) diamond blade.

1

2

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4

1 Blade

2 Support rollers

3 Drive wheel

4 Guide rollers

5 V-shaped edge

3

Diamond blades for different materials

• Diamond blades are ideal for masonry, reinforced
concrete and other composite materials.

• We offers a number of blades for different materials in its
range. Check with your Husqvarna dealer to see which
blades are best suited for your usage.

Sharpening diamond blades

• Always use a sharp diamond blade.

• 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.

• Sharpen the blade by cutting in a soft material such as
sandstone or brick.

Vibrations on diamond blades

• The blade can become out of round and vibrate if a too
high feed pressure is used.

• A lower feed pressure can stop the vibration. Otherwise
replace the blade.

Checking wear

As the blade is used the inside diameter and the groove in the
drive wheel become worn.

The ring cutter will also work well in the future if:

• the drive wheel is not too worn

1) New

2) Worn

• the guide rollers are not too worn

1) New, 3 mm (0.12’’)

2) Worn, ≤ 1,5 mm (0.06’’)

Drive

On account of the machine’s unique design the driving power
is not transferred at the centre of the blade.

8 – English

BLADES

• adjustment between the rollers and blade is correct. See
instructions in the section "Assembling and adjustments".

The roller setting should be checked twice during the life
of the diamond blade, once after fitting the blade and
when the blade is semi worn.

Transport and storage

• Store the blade in a dry place.

• Inspect new blades for transport or storage damage.

English – 9

ASSEMBLING AND ADJUSTMENTS

Fitting the blade

WARNING! It is forbidden to reconstruct a
used blade. A used blade may be weakened.

!

A reconstructed blade can crack or break
into pieces and seriously injury the operator
or other persons.

WARNING! Check that the blade is not
damaged before fitting it on the machine.

!

Damaged blades can disintegrate and cause
serious personal injury.

NOTICE! Replace the drive wheel when fitting a new blade.
A worn drive wheel can result in the blade slipping and
becoming damaged.

Inadequate water flow drastically shortens the life of the
drive wheel.

• Wipe off any dirt from the surface of the blade.

• Loosen the locking nuts on the support roller cover.

• Loosen the knob to offload the springs.

• Remove the four screws holding the support roller guard
using a 6 mm hex key and lift off the cover.

• Fit the blade.

• The blade has a groove (1) on one side that acts a the
guide groove for the support rollers. Ensure that the V­shaped edge of the blade enters the drive wheel and that
the blade’s guide groove fits in the guide rollers.

• Unscrew the adjuster screws a few turns.

10 – English

• Ensure that the V-shaped edge of the blade enters the
drive wheel and that the blade’s guide groove fits in the
guide rollers. See instructions in the section "Blades".

• Press in the guide roller if necessary, so that it climbs into
the groove on the blade.

ASSEMBLING AND ADJUSTMENTS

• Fit the support roller cover. Now tighten the four screws
fully.

• Rotate the blade and make sure that the support rollers
are not clamped against the blade.

• Tighten the locking nuts on the support roller guard.

• Rotate the blade and make sure you can still hold the
rollers with your thumb when the blade is rotated.

The machine shall stand upright when checking the roll
pressure. If the machine lies on its side the weight of the
blade makes it difficult to make a correct adjustment.

• Adjust the adjuster screws so that the support rollers
make contact against the blade.

• Adjust so you can easily stop the support rollers using
your thumb when the blade is rotated. The support rollers
should only follow the blade occasionally.

• Tighten the knobs fully and the machine is ready to use.

CAUTION! Incorrect adjustment can result in damage to the
blade.

If the blade rotates slowly or stops, stop cutting immediately
and trouble shoot.

Water hose

Connect the water hose to the water supply. The water flow is
activated by opening the check valve. Minimum water flow: 4
l/min Note that the machine’s hose nipple is fitted with a filter.

English – 11

FUEL HANDLING

General

WARNING! Running an engine in a confined
or badly ventilated area can result in death

!

due to asphyxiation or carbon monoxide
poisoning. Use fans to ensure proper air
circulation when working in trenches or
ditches deeper than one meter (3 foot).

Fuel and fuel fumes are highly inflammable
and can cause serious injury when inhaled
or allowed to come in contact with the skin.
For this reason observe caution when
handling fuel and make sure there is
adequate ventilation.

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!

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

Fuel

NOTICE! 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.

Gasoline

• Use good quality unleaded gasoline.

• The lowest recommended octane grade is 87
((RON+MON)/2). If you run the engine on a lower octane
grade than 87 so-called knocking can occur. This gives
rise to a high engine temperature and increased bearing
load, which can result in serious engine damage.

• When working at continuous high revs a higher octane
rating is recommended.

Environment fuel

The use of environmentl fuel (alkylate fuel), or environment
fuel for four-stroke engines blended with two-stroke oil as set
out below is recommended.

Ethanol blended fuel, E10 may be used (max 10% ethanol
blend). Using ethanol blends higher than E10 will create lean
running condition which can cause engine damage.

Mixing

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

• 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.

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

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

Mixing ratio

1:50 (2%) for all engines.

Gasoline, litre Two-stroke oil, litre

2% (1:50)

5 0,10

10 0,20

15 0,6/0,30

20 0,40

US gallon US fl. oz.

1 2 1/2

2 1/2 6 1/2

5 12 7/8

Fueling

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

!

engine should be switched off, and the stop
switch in STOP position.

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

Clean the area around the fuel cap.

Tighten the fuel cap carefully after refuelling.
Negligence may lead to the start of a fire.

Move the machine at least 10 ft (3 m) from
the refuelling point before starting it.

Never start the machine:

• If you have spilled fuel or chain oil on the machine. 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.

• If the machine is leaking fuel. Check regularly for leaks
from the fuel cap and fuel lines.

Two-stroke oil

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

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

• Never use oil intended for four-stroke engines.

12 – English

Transport and storage

• 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.

• When storing and transporting fuel always use approved
containers intended for this purpose.

FUEL HANDLING

Long-term storage

• 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.

English – 13

OPERATING

Protective equipment

General

• Do not use the machine unless you are able to call for help
in the event of an accident.

Personal protective equipment

You must use approved personal 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.

WARNING! The use of products such as
cutters, grinders, drills, that sand or form

!

material can generate dust and vapours
which may contain hazardous chemicals.
Check the nature of the material you intend
to process and use an appropriate breathing
mask.

Long-term exposure to noise can result in
permanent hearing impairment. So always
use approved hearing protection. Listen out
for warning signals or shouts when you are
wearing hearing protection. Always remove
your hearing protection as soon as the
engine stops.

Always wear:

• Approved protective helmet

• Hearing protection

• Approved eye protection. If you use a face shield then you
must also wear approved protective goggles. Approved
protective goggles must comply with standard ANSI Z87.1
in the USA or EN 166 in EU countries. Visors must comply
with standard EN 1731.

• Breathing mask

• Heavy-duty, firm grip gloves.

• Tight-fitting, heavy-duty and comfortable clothing that
permits full freedom of movement.

• Boots with steel toe-caps and non-slip sole

Other protective equipment

CAUTION! Sparks may appear and start a
fire when you work with the machine. Always

!

keep fire fighting equipment handy.

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

• Keep in mind that it is you, the operator that is responsible
for not exposing people or their property to accidents or
hazards.

• The machine must be kept clean. Signs and stickers must
be fully legible.

Always use common sense

It is not possible to cover every conceivable situation you can
face. Always exercise care and use your common sense. If
you get into a situation where you feel unsafe, stop and seek
expert advice. Contact your dealer, service agent or an
experienced user. Do not attempt any task that you feel
unsure of!

WARNING! The machine can be a dangerous
tool if used incorrectly or carelessly, which

!

can cause serious or fatal injury to the
operator or others.

Never allow children or other persons not
trained in the use of the machine to use or
service it.

Never allow anyone else to use the machine
without first ensuring that they have
understood the contents of the operator’s
manual.

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

WARNING! Unauthorized modifications and/
or accessories may lead to serious injury or

!

death to the user or others. Under no
circumstances may the design of the
machine be modified without the permission
of the manufacturer.

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

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

• Fire Extinguisher

• Always have a first aid kit nearby.

General safety precautions

This section describes basic safety directions for using the
machine. This information is never a substitute for
professional skills and experience.

14 – English

Always use genuine accessories.

Your warranty may not cover damage or
liability caused by the use of non-authorized
accessories or replacement parts.

OPERATING

WARNING! This machine produces an
electromagnetic field during operation. This

!

field may under some circumstances
interfere with active or passive medical
implants. To reduce the risk of serious or
fatal injury, we recommend persons with
medical implants to consult their physician
and the medical implant manufacturer
before operating this machine.

Work area safety

WARNING! The safety distance for the power
cutter is 15 metres (50 foot). 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.

• Observe your surroundings to ensure that nothing can
affect your control of the machine.

• Ensure that no one/nothing can come into contact with the
cutting equipment or be hit by parts if the blade breaks.

• Do not use the machine in bad weather, such as dense
fog, heavy rain, strong wind, intense cold, etc. Working in
bad weather is tiring and can lead to dangerous
conditions, e.g. slippery surfaces.

• 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.

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

• Make sure that no pipes or electrical cables are routed in
the working area or in the material to be cut.

• Never move the machine when the cutting equipment is
rotating. The machine is equipped with a friction retarder
to shorten the stop time.

• The guard for the cutting equipment should be adjusted so
that the rear section is flush with the work piece. Spatter
and sparks from the material being cut are then collected
up by the guard and led away from the user. The guards
for the cutting equipment must always be fitted when the
machine is running.

• Never use the kickback zone of the blade for cutting. See
instructions under the heading "Kickback".

• Keep a good balance and a firm foothold.

• Never cut above shoulder height. Never cut from a ladder.
Use a platform or scaffold when working at high altitude.

• Always hold the machine in a firm grip with both hands.
Hold it so that the thumbs and fingers grip round the
handles.

Basic working techniques

WARNING! Do not pull the power cutter to
one side, this can cause the blade to jam or

!

break resulting in injury to people.

Under all circumstances avoid cutting with
the side of the blade, as this will definitely
result in damage, breakage or can cause
serious injuries. Only use the cutting
section.

Cutting plastics with a diamond blade can
cause kickback when the material melts due
to the heat produced when cutting and
sticks to the blade. Never cut plastic
materials with a diamond blade!

• The machine is designed and intended for cutting with
diamond blades intended for ring cutters. The machine
shall not be used with any other type of blade, or for any
other type of cutting.

• Remain at a distance from the blade when the engine is
running.

• Stand at a comfortable distance from the work piece.

• Check that the blade is not in contact with anything when
the machine is started.

• Apply the cutting blade gently with high rotating speed (full
throttle) Maintain full speed until cutting is complete.

• Let the machine work without forcing or pressing the
blade.

• Use a small part of the blade’s cutting area.

English – 15

OPERATING

• Feed the machine in line with the blade. Side pressure can
destroy the blade and is extremely dangerous.

• Move the blade slowly backwards and forwards to give a
small contact surface between the blade and material to
be cut. This will mean the blade temperature is kept down
resulting in efficient cutting.

Cutting depth

K 970 Ring can cut up to a depth of 260 mm (10 inches).
Making a guide cut of 50-70 mm (2-3 inches) first, gives you
better control of the machine. This means the water disc can
penetrate into the workpiece and help control the machine.
Attempting to saw the entire depth in one run takes longer.
Working with several runs, 3 to 4 when the cut is 260 mm (10
inches) in depth, is much quicker.

1234

Small work

First make a shallow marking cut, max 50-70 mm (2-3 inches)
in depth. Now make the final cut.

Cutting holes

NOTICE! If the upper horizontal cut is made before the
lower horizontal cut, the work piece will fall on the blade and
jam it.

• First make the lower horizontal cut. Now make the two
vertical cuts. Finish with the upper horizontal cut.

3

22

1

• Remember to divide the blocks up into manageable
pieces so that they can be transported and lifted safely.

When cutting out large holes it is important that the piece to
be cut out is braced so that it cannot fall against the operator.

260 mm

10”

Large work

Cuts exceeding 1 m - secure a batten along the line to be cut.
The batten acts as a guide. Use this guide to make a marking
cut along the entire length of the cut, 50-70 mm (2-3 inches)
in depth. Remove the guides once the marking cut has been
made.

16 – English

OPERATING

Kickback

WARNING! Kickback can happen very
suddenly and violently; kicking the power

!

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

The word kickback is used to describe the sudden reaction
that causes the power cutter and cutting blade to be thrown
from an object when the upper quadrant of the blade, known
as the kickback zone, touches an object.

Pinching kickback

Pinching is when the cut closes and pinches the blade. If the
blade is pinched or stalled the reactive force will be strong and
you might not be able to control the power cutter.

If the blade is pinched or stalled in the kickback zone, the
reactive force will push the power cutter up and back towards
the user in a rotating motion causing serious or even fatal
injury.

How to aviod kickback

Avoiding kickback is simple.

• The work piece must always be supported so that the cut
stays open when cutting through. When the cut opens
there is no kickback. If the cut closes and pinches the
blade ther is always a risk of kickback.

General rules

Kickback only occurs when the cutting blades kickback zone
touches an object.

• Never use the kickback zone of the blade for cutting.

• Keep a good balance and a firm foothold. Stand at a
comfortable distance from the work piece.

• Always cut at maximum speed.

• Take care when inserting the blade in an existing cut.
Never cut in a narrower pre-cut cut.

• Never cut above shoulder height.

• Be alert to movement of the work piece or anything else
that can occur, which could cause the cut to close and
pinch the blade.

• Take care when inserting the blade in an existing cut.

• Be alert to movement of the work piece or anything else
that can occur, which could cause the cut to close and
pinch the blade.

Transport and storage

• Secure the equipment during transportation in order to
avoid transport damage and accidents.

• For transport and storage of Blades, see the section
"Blades".

• For transport and storage of fuel, see the section "Fuel
handling".

• Store the equipment in a lockable area so that it is out of
reach of children and unauthorized persons.

English – 17

STARTING AND STOPPING

Before starting

WARNING! Please read the operator’s
manual carefully and make sure you

!

understand the instructions before using the
machine.

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

Make sure no unauthorised persons are in
the working area, otherwise there is a risk of
serious personal injury.

Check that the fuel cap is properly secured,
and that there is no fuel leakage. Risk of fire.

• Perform daily maintenance. See instructions in the section
"Maintenance".

Starting

• Decompression valve: Press in the valve to reduce the
pressure in the cylinder, this is to assist starting the power
cutter. The decompression valve should always be used
when starting. The valve automatically returns to its initial
position when the machine starts.

• Start throttle position - warm engine: The correct

choke/start throttle setting is obtained by pulling the choke
control to the choke position and then pushing it in again.
This only engages the start throttle setting without any
choke.

• Air purge: Press the air purge diaphragm repeatedly until

fuel fills the diaphragm (at least 6 times). The diaphragm
need not be completely filled.

Start the engine

WARNING! The cutting blade rotates when
the engine is started. Make sure it can rotate

!

freely.

• Stop switch: Make sure that the stop switch (STOP) is in
the left position.

• Start throttle position - cold engine: Start throttle
position and choke is obtained by pulling out the choke
completely.

• 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

• 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.

NOTICE! 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.

• With a cold engine: The machine stops when the engine
fires becase the chokel control is pulled out.

Press the choke control and the decompression valve.

Pull the starter handle until the engine starts.

18 – English

STARTING AND STOPPING

• When the engine starts, quickly apply full throttle to
automatically disengage fast idle.

Stopping

CAUTION! The cutting blade continue to
rotate up to a minute after the motor has

!

stopped. (Blade coasting.) Make sure that
the cutting blade can rotate freely until it is
completely stopped. Carelessness can
result in serious personal injury.

• Stop the engine by moving the stop switch (STOP) to the
right.

English – 19

MAINTENANCE

General

WARNING! The user must only carry out the
maintenance and service work described in

!

this manual. More extensive work must be
carried out by an authorized service
workshop.

The engine should be switched off, and the
stop switch in STOP position.

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

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

• Let your Husqvarna dealer regularly check the machine and make essential adjustments and repairs.

Maintenance schedule

In the maintenance schedule you can see which parts of your machine that require maintenance, and with which intervals it should
take place. The intervals are calculated based on daily use of the machine, and may differ depending on the rate of usage.

Daily maintenance Weekly maintenance Monthly maintenance

Cleaning Cleaning Cleaning

External cleaning Spark plug

Cooling air intake Fuel tank

Functional inspection Functional inspection Functional inspection

General inspection Vibration damping system* Fuel system

Throttle lockout* Muffler* Air filter

Stop switch* Drive belt Drive gear, clutch

Blade guards* Carburetor

Diamond blade** Starter

Guide rollers

Support rollers

Drive wheel

*See instructions in the section "Machine’s safety equipment".

** See instructions in the section "Blades" and "Assembly and settings".

20 – English

MAINTENANCE

Cleaning

External cleaning

• Clean the machine daily by rinsing it with clean water after
the work is finished.

Cooling air intake

• Clean the cooling air intake when needed.

NOTICE! A dirty or blocked air intake results in the machine
overheating which causes damage to the piston and
cylinder.

Spark plug

• If the machine is low on power, difficult to start or runs
poorly at idle speed: always check the spark plug first
before taking other steps.

• Ensure that the spark plug cap and ignition lead are
undamaged to avoid the risk of electric shock.

• If the spark plug is dirty, clean it and at the same time
check that the electrode gap is 0.5 mm. Replace if
necessary.

Guide rollers

Lubricating the guide rollers

• Connect the grease gun to the grease nipples.

• Pump in grease until clean grease emerges from the
overflow hole.

NOTICE! Always use the recommended spark plug type!
Use of the wrong spark plug can damage the piston/
cylinder.

These factors cause deposits on the spark plug electrodes,
which may result in operating problems and starting
difficulties.

• An incorrect fuel mixture (too much or incorrect type of
oil).

• A dirty air filter.

Functional inspection

General inspection

• Check that nuts and screws are tight.

Replacing the guide rollers

Replace the guide rollers when half of the flange on the rollers
is worn.

1) New, 3 mm (0.12’’)

2) Worn, ≤ 1,5 mm (0.06’’)

• Remove the support roller cover.

English – 21

MAINTENANCE

• Lift off the blade.

• Unscrew the knob. First turn the knob a few turns until you
feel a resistance. The guide roller then follows the knob
out and stops when it feels a resistance.

The guide roller is pressed into the knob. In order to
loosen the guide roller, you need to continue turning the
knob until it loosens completely.

• Insert the new guide roller in the chassis. Now press the
guide roller into the knob.

• Lubricate the guide rollers. See instructions under the
heading ”Lubricating the guide rollers”.

• Fit the blade. See instructions in the section "Assembling
and adjustments".

Support rollers

Replace the support rollers when the roller surface is flat,
when the groove on the roller surface has worn away.

1) New

2) Worn

• The guide roller can now be pulled out of the chassis.

• Screw the knob until it bottoms, and then loosen the knob
2 turns.

Replacing the support rollers

• Remove the support roller cover.

22 – English

MAINTENANCE

• Use a 19 mm fixed spanner and a 13 mm combination
spanner to replace the rollers.

• Lubricate using bearing grease inside the rollers before
the new rollers are fitted.

Drive belt

Tensioning the drive belt

If the drive belt slips, it must be tensioned. The tension of a
new drive belt must be readjusted after one or two tanks of
fuel have been used.

When the machine is equipped with a friction retarder, a
scraping sound can be heard from the bearing housing when
the blade is turned by hand. This is quite normal. Please
contact an accredited Husqvarna workshop if you have any
questions.

The drive belt is enclosed and well protected from dust and
dirt.

• Dismantle the cover and loosen the belt tensioning screw.

• Press on the belt tensioner with your thumb to tension the
belt. Now tighten the screw holding the belt tensioner.

Drive wheel

NOTICE! Replace the drive wheel when fitting a new blade.
A worn drive wheel can result in the blade slipping and
becoming damaged.

Inadequate water flow drastically shortens the life of the
drive wheel.

Replacing the drive wheel

• Lock the axle using the locking button.

• Loosen the centre screw and remove the washer.

Replacing the drive belt

WARNING! Never start the engine when the
belt pulley and clutch are removed for

!

maintenance. Do not start the machine
without the cutting arm or cutting head
fitted. Otherwise the clutch could come
loose and cause personal injuries.

• Dismantle the cover and loosen the belt tensioning screw.
Push back the belt tensioning roller and install a new drive
belt.

• You can now lift off the drive wheel.

NOTICE! Make sure that both belt pulleys are clean and
undamaged before a new drive belt is fitted.

English – 23

MAINTENANCE

• Press on the belt tensioner with your thumb to tension the
belt. Now tighten the screw holding the belt tensioner.

• Fit the belt cover.

Carburetor

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.

Starter

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.

Checking the starter cord

• Loosen the screws that hold the starter against the
crankcase and remove the starter.

• Pull the cord out about 30 cm and lift it into the cut-out in
the periphery of the starter pulley. When the cord is intact:
Release the spring tension by letting the pulley rotate
slowly backwards.

Adjusting the idle speed

CAUTION! 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.

• Start the engine and check the idling setting. When the
carburettor is set correctly the cutting blade should be still
while engine is idling.

• Adjust the idle speed using the T screw. When an
adjustment is necessary, first turn the screw clockwise
until the blade starts to rotate. Now turn the screw anti­clockwise until the blade stops rotating.

T

Changing a broken or worn starter cord

• 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.

Rec. idle speed: 2700 rpm

24 – English

MAINTENANCE

• Secure the starter cord around the cord pulley as
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.

Tensioning the recoil spring

• 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.

• 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.

• Loosen the bolts holding the spring cassette.

• 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.

Fitting the starter

• To fit 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.

Changing a broken recoil spring

• Undo the bolt in the centre of the pulley and remove the
pulley.

• Bear in mind that the return spring lies tensioned in the
starter housing.

• Tighten the screws.

Fuel system

General

• Check that the fuel cap and its seal are not damaged.

• Check the fuel hose. Replace when damaged.

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.

changed at least once per year.

The filter should be

English – 25

MAINTENANCE

Air filter

The air filter only needs to be checked if the engine drops in
power.

• Loosen the screws. Remove the air filter cover.

• Check the air filter and replace if necessary.

Replacing the air filter

NOTICE! The air filter must not be cleaned or blown clean
with compressed air. This will damage the filter.

• Loosen the screws. Remove the cover.

Reconstructing the blade

WARNING! Ring cutter blades must not be
reconstructed. Due to its design, a ring

!

cutter blade is exposed to other strains than
a centre driven 14 inch diamond blade.
Firstly, the drive wheel is driven on the inner
diameter of the blade so that both the
surfaces of the drive wheel and the blade are
exposed to wear. The core of the blade
becomes thinner and the guide wider, which
prevents the blade being driven by the
wheel. Secondly, the blade is exposed to
loads from the rollers and from the actual
cutting process when the blade is not held
completely straight. Strain builds up in the
blade until it cracks or breaks if it has been
reconstructed. A shattered blade can cause
serious personal injuries to the user or other
persons. For this reason Husqvarna does
not approve ring cutting blades that have
been reconstructed. Contact your
Husqvarna dealer for instructions.

• Replace the air filter.

Drive gear, clutch

• Check the clutch centre, drive gear and clutch spring for
wear.

26 – English

TROUBLE SHOOTING

Troubleshooting schedule

WARNING! If service operations or trouble
shooting does not require the machine to be

!

on, the engine should be switched off, and
the stop switch in STOP position.

Problem Probable cause

The blade does not rotate. Roller knobs not tightened fully.

The blade not fitted on guide rollers correctly.

Rollers tensioned too much.

The blade rotates too slowly. Roller knobs not tightened fully.

Worn drive wheel.

The V-shaped inner diameter of the blade is worn.

The springs on the guide rollers are weakened.

Defective roller bearings.

The blade jumps out of its position. Roller setting too loose.

Worn guide rollers.

The blade not fitted on guide rollers correctly.

Damaged blade.

The blade warps. Rollers tensioned too much.

Blade overheating.

Segments break. Bent, twisted or badly maintained blade.

Continue to use the blade only if one segment is missing or leave for
reconstruction when the blade is worn max 50 %.

The blade cuts too slowly. Wrong blade for the material in question.

The blade slips.

The guide rollers does not move in and out freely. A seized roller can not press
the blade hard enough against the drive wheel.

Worn drive wheel. Abrasive material and too little water when cutting
increases the wear on the wheel.

Worn guide roller flange. When more than half of the width of the flange is worn
the blade slips.

The blade’s groove and inner edge are worn. Caused by inferior flushing of
abrasive material and/or a worn drive wheel causing the blade to slip.

English – 27

TECHNICAL DATA

Technical data

Motor K 970 Ring

Cylinder displacement, cu.in/cm

Cylinder bore, inch/mm 2.2/56

Stroke, inch/mm 1.5/38

Idle speed, rpm 2700

Max. fast idle speed, rpm 9300 (+/- 150)

Power, kW/ rpm 4.8/9000

Ignition system

Manufacturer of ignition system SEM

Type of ignition system CD

Spark plug

Electrode gap, inch/mm 0.02/0.5

Fuel and lubrication system

Manufacturer of carburetor Walbro

Carburetor type RWJ5

Fuel tank capacity, US pint/litre 2.11/1.0

Weight

Power cutter without fuel and cutting blade, Lbs/kg 29.9/13.6

3

5.7/93.6

Champion RCJ 6Y/
NGK BPMR 7A

NOTE! This spark ignition system complies with the Canadian ICES-002 standard.

Cutting equipment

Max. peripheral speed, m/s / ft/s 2.2/55

Blade diameter, mm/inches 350/14

Cutting depth, mm/inches 260/10

Max. engine speed, rpm 10000

Blade weight, kg 0.8

Dimensions

Height, mm/inches 410/16

Length, mm/inches 715/28

Width, mm/inches 260/10

Water consumption, litres/min 4

28 – English

FEDERAL EMISSION CONTROL WARRANTY STATEMENT

YOUR WARRANTY RIGHTS AND OBLIGATIONS

The EPA (The US Environmental Protection Agency),
Environment Canada and Husqvarna Construction Products
are pleased to explain the emissions control system warranty
on your 2009 and later small nonroad engine. In U.S. and
Canada, new small nonroad engines must be designed, built
and equipped to meet the federal stringent anti-smog
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.

MANUFACTURER′′′′S WARRANTY
COVERAGE

The 2009 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.

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
regarding your warranty rights and responsibilities, you
should contact your nearest authorized servicing dealer or
call Husqvarna Construction Products, at 1-800-288-5040 or
www.us.husqvarna.com .

WARRANTY PERIOD Any warranted part which is not
scheduled for replacement as required maintenance, or
which is scheduled only for regular inspection to the effect of
“repair or replace as necessary” shall be warranted for 2
years. Any warranted part which is scheduled for replacement
as required maintenance shall be warranted for the period of
time up to the first scheduled replacement point for that part.

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.

OWNER′′′′S WARRANTY
RESPONSIBILITIES

As the small nonroad engine owner, you are responsible for
the performance of the required maintenance listed in your
Operator′s Manual. Husqvarna Construction Products
recommends that you retain all receipts covering
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
1-800-288-5040 or www.us.husqvarna.com .

WARRANTY COMMENCEMENT DATE

The warranty period begins on the date small nonroad engine
is delivered.

LENGTH OF COVERAGE

WHAT IS NOT COVERED

All failures caused by abuse, neglect or improper
maintenance are not covered.

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.

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
1-800-288-5040 or www.us.husqvarna.com .

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.

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.

EMISSION CONTROL WARRANTY PARTS LIST

1 Carburetor and internal parts

2 Intake pipe, airfilter holder and carburetor bolts.

English – 29

FEDERAL EMISSION CONTROL WARRANTY STATEMENT

3 Airfilter and fuelfilter covered up to maintenance schedule.

4 Ignition System

1 Spark Plug, covered up to maintenance schedule

2 Ignition Module

MAINTENANCE STATEMENT

The owner is responsible for the performance of all required
maintenance, as defined in the operator’s manual.

30 – English

´®z+Td3¶5¢¨

!

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*
*/ National Toxicology 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.

Original instructions

1152681-95

´®z+Td3¶5¢¨

2012-01-18

rev. 2