Operator’s manual
K950 Chain
Read these instructions carefully and make sure you understand them
before using the machine.
English
SYMBOL EXPLANATION
Symbols on the cut-off saw:
Symbols in the Operator's Manual:
WARNING! The cut-off saw can be
dangerous! Careless and incorrect use can
result in serious or fatal injury to the
operator or others.
Switch off the engine by moving the stop
switch to the STOP position before
carrying out any checks or maintenance.
Please read the instructions carefully and
make sure you understand them before
using the cut-off saw.
Always wear approved protective gloves.
Always wear:
• Approved protective helmet
• Approved hearing protection
• Protective glasses or visor
Regular cleaning is required.
This product is in accordance with
applicable CE directives.
Warning
Visual check.
Cutting creates a lots of dust which can
cause inhalation damages. Use appropriate
dust mask or respirator protection. Avoid
breathing petrol fumes and exhaust gases.
Provide for good ventilation.
Protective glasses or a visor must be
worn.
Warning
Sparks from the cut-off saw can cause fire
in combustible materials such as: petrol
(gas), wood, dry grass etc.
Run position.
Noise emission to the environment
according to the European Community’s
Directive. The machine’s emission is
specified in chapter Technical data and on
label.
Stop with spring loaded return to Run
position.
Stop, in fixed position.
2– English
CONTENTS
List of Contents
Symbol explanation..................................................... 2
Safety instructions
Before using your new cut-off saw:
• Read the Operator’s Manual carefully.
• Check the assembly and adjustment of the cutting chain, see
chapter ”Assembly”.
Personal protective equipment ....................................... 4
• Start the engine and check the carburetor settings. See
chapter ”Maintenance”, section ”Carburetor”. When adjusted
correctly the cutting chain should not rotate when idling.
Setting the idling speed is described in the Operator’s
Manual. Adjust the speed according to these instructions. Do
not use the cut-off saw if the idling speed is not correctly
adjusted!
The machine’s safety equipment............................. 4
Control, maintenance and service of the machine’s safety
equipment............................................................................ 4
General safety instructions .............................................. 6
Storage ................................................................................ 6
Fuel safety ........................................................................... 7
• Let your Husqvarna dealer check the cut-off saw and carry
out essential adjustments and repairs.
General working instructions........................................... 7
Using ................................................................................... 8
Cutting ................................................................................. 8
Kickback ............................................................................ 10
Care and storage............................................................... 10
WARNING!
Under no circumstances should you modify
the original design of the cut-off saw without
approval from the manufacturer. Always use
genuine spare parts. Unauthorized
modifications or accessories may lead to
serious injury or death.
!
Cutting equipment ............................................................ 11
Cutting chains.................................................................... 11
What is what?
What is what on the machine? .......................................... 12
Your warranty does not cover damage or
liability caused by the use of non-authorized
accessories or replacement parts.
Assembly
How to tension the chain ................................................... 13
How to change the chain and rim ...................................... 13
How to change the clamping force of the bar .................... 14
Fuel handling
Fuel mixture....................................................................... 15
Fuelling .............................................................................. 15
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.
!
Start and stop
Start and stop .................................................................... 16
Maintenance
Carburetor ......................................................................... 17
Fuel filter............................................................................ 18
Air filter .............................................................................. 18
Starter................................................................................ 19
Ignition system .................................................................. 20
Spark plug ......................................................................... 20
Cooling system .................................................................. 20
Muffler ............................................................................... 20
Daily maintenance ............................................................. 21
Weekly maintenance ......................................................... 21
Monthly maintenance ........................................................ 21
WARNING! The ignition system of this
machine produces an electromagnetic field
during operation. This field may under
some circumstances interfere with pacema-
kers. To reduce the risk of serious or fatal
injury, we recommend persons with pace-
makers to consult their physician and the
pacemaker manufacturer before operating
this machine.
!
Technical Data
K950 Chain........................................................................ 22
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 – 3
SAFETY INSTRUCTIONS
THE MACHINE’S SAFETY
EQUIPMENT
WARNING! Incorrect or careless use of a
cut-off saw can turn it into a dangerous tool
that can cause serious or even fatal injury.
It is extremely important that you read and
understand this manual.
!
This section describes the cut-off saw’s safety equipment, its
function and how checks and maintenance are carried out to
ensure that it operates correctly.
WARNING! Never use a cut-off saw with
defective safety equipment. Follow the
control, maintenance and service instructions
PERSONAL PROTECTIVE EQUIPMENT
!
WARNING! When using a cut-off saw,
approved protective equipment must be used.
Personal protective equipment does not
eliminate the risk of accidents, however, it can
reduce the effects of an injury in the event of
an accident. Ask your dealer for help when
choosing protective equipment.
described in this manual.
!
1 Anti-vibration
system
• PROTECTIVE HELMET
• EAR PROTECTION
• PROTECTIVE GLASSES
OR FULL FACE
Your cut-off saw is equipped
with an anti-vibration system.
This is designed to give as low
vibration levels and
PROTECTION
comfortable usage as possible.
• BREATHING MASK
The cut-off saw’s antivibration
system reduces the transfer of
vibration between the engine/
cutting equipment and the
operator. The engine body
including the cutting equipment
is suspended in
• HEAVY-DUTY, FIRM GRIP
PROTECTIVE GLOVES
a handle system via anti-
vibration elements.
• SNUG-FITTING, HEAVY-
DUTY, COMFORTABLE
CLOTHING THAT ALLOWS
FULL FREEDOM OF
MOVEMENT
• LEG PROTECTION (TO
PROTECT AGAINST
SPARKS AND CUTTING
FRAGMENTS)
2 Stop switch
• ANTI-SLIP BOOTS WITH
STEEL TOE CAPS
The stop switch should be
used to stop the engine.
• FIRST AID KIT SHOULD
ALWAYS BE ON HAND
4– English
SAFETY INSTRUCTIONS
3 Muffler
Control, maintenance and service of
the machine‘s safety equipment
WARNING! During use and for some time
after the muffler is very hot. Do not touch the
muffler if it is hot!
WARNING! All service and repairs to the cut-
off saw require special training. This applies
especially to the cut-off saw’s safety
!
!
equipment. If the cut-off saw does not meet
any of the controls listed below you should
contact your service workshop.
The muffler is designed to
give the lowest possible noise
level and to direct the engine‘s
exhaust fumes away from the
user. The engine‘s exhaust
fumes are hot and can contain
sparks, which can lead to the
outbreak of fire.
The purchase of one of our products
guarantees that professional repair and
servicing will be carried out on it. If the point
of purchase is not one of our servicing
dealers, please ask for details of the closest
service workshop.
1 Anti-vibration system
Check the anti-vibration
elements regularly for material
cracks and deformation.
IMPORTANT INFORMATION! It is extremely important that
the instructions for checking, maintaining and servicing
the muffler are followed. (see the section “Control,
maintenance and service of the machine’s safety
equipment“).
WARNING! The inside of muffler contain
chemicals that may be carcenogenic. Avoid
!
contact with these elements in the event om
damaged muffler.
Check that the anti-vibration
elements are securely
mounted between the engine
unit and the handle system.
4 Throttle lock
The throttle lock is designed
to prevent accidental opera-
tion of the throttle control.
When you press the lock (A)
(i.e. when you grasp the
handle) it releases the throttle
trigger (B).
A
When you release the handle
the throttle trigger and the
throttle lock both move back
to their original positions. This
movement is controlled by two
independent return springs.
This arrangement means that
the throttle control is
2 Stop switch
Start the engine and make
sure that the engine stops
when the stop switch is
moved to the stop position.
automatically locked at the
idle setting when you release
the handle.
English – 5
SAFETY INSTRUCTIONS
3 Muffler
GENERAL SAFETY INSTRUCTIONS
Never use a machine that
has a defective muffler.
IMPORTANT INFORMATION!
Do not use the cut-off saw until you have read the
entire contents of this Operator’s Manual. All
servicing, in addition to the points listed in the section
”Control, maintenance and service of the machine’s
safety equipment”, should be carried out by trained
service specialists.
Check regularly that the
muffler is secured to the
engine body.
• Use the equipment recommended in the chapter ”Personal
protective equipment”.
• Never use the machine when you are tired, under the
influence of medicines/drugs or alcohol.
• Do not lend the cut-off saw to anyone without providing this
Operator’s Manual. Ensure the person using the cut-off saw
understands the information in this Operator’s Manual.
Storage
4 Throttle lock
• Store the cut-off saw under lock and key so that it’s out of
reach for children and unauthorised persons.
1
2
3
Make sure the throttle
control is locked at the
idle setting when you
release the throttle lock.
Press the throttle lock and
make sure it returns to its
original position when you
release it.
Check that the throttle
control and throttle lock
move freely and that the
return springs work
properly.
4
Start the saw and apply
full throttle. Release the
throttle control and check
that the chain stops and
remains stationary. If the
chain rotates when the
throttle is on idle setting
you should check the
carburettor idle
adjustment. See the
section on ”Maintenance”.
WARNING! Never use a cut-off saw with
defective safety equipment. The cut-off saw’s
safety equipment should be checked and
maintained as described in this Operator’s
Manual. If your cut-off saw does not meet any
of these controls you should contact your
service workshop.
!
6– English
SAFETY INSTRUCTIONS
GENERAL WORKING INSTRUCTIONS
Fuel safety
(Filling/Fuel mixture/Storage)
This section takes up the basic safety precautions for working
with the cut-off saw. Follow these general working instructions,
but never use a machine without the possibility of calling for
help in the event of an accident.
WARNING! Exercise great care when handling
fuel. Bear in mind the risk of fire, explosions
and inhaling fumes.
!
Basic safety precautions
• Never fill the machine while
the engine is running.
IMPORTANT INFORMATION! Never work with a cut-off
saw that is defective or incorrectly adjusted. Do not
work with a cut-off saw that is incomplete or where
assembly has not been carried out in a satisfactory
manner. Check that the cutting chain stops rotating
when the throttle is released. If you encounter a
situation where you are uncertain how to proceed you
should ask an expert.
• Provide good ventilation
when filling or mixing fuel
(gasoline and 2-stroke oil).
• Move the machine at least 3
m from the filling position
before starting.
Avoid all usage which you consider to be beyond your
capability.
Min 3 m
(10ft)
• Never start the machine:
a) If you have spilt fuel
on it. Wipe up all
• Check that no one is in the immediate vicinity when the
machine is started or while working with the machine to
ensure that people, animals or other things cannot affect your
control of the cut-off saw.
spillage.
b) If you have spilt fuel
on yourself or your
clothes. Change your
clothes.
• Avoid usage in unfavourable weather conditions, for example,
thick fog, heavy rain, strong winds or extreme cold, etc. To
work in bad weather conditions is tiring and can create
dangerous circumstances, e.g. slippery surfaces.
c) If there is a fuel leak.
Make regular checks for
leakage from the fuel
cap and the fuel supply
pipes.
• Never start to work with the cut-off saw 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.
• Store the cut-off saw and fuel so that any leakage or fumes
do not risk coming into contact with sparks or naked flames.
For example, electric machines, electric motors, electrical
switches/power switches, heaters or the like.
• Make sure clothing and parts of the body do not come into
contact with the cutting chain when the engine is started.
• Maintain a safe distance from the cutting chain when the
engine is running.
• When storing fuel, approved containers intended for this
purpose must be used.
• Ensure that the working area is sufficiently illuminated to
create a safe working environment.
• When storing the cut-off saw for long periods the fuel tank
must be emptied. Contact your local fuel station to find out
how to dispose of excess fuel.
• Check the cutting area for buried cables and wires.
• Consider the carbon monoxide risk! The diamond chain saw
emits highly dangerous carbon monoxide and as a result must
never be used in unventilated areas. Even used in deep
recesses it represents a risk if badly ventilated. Carbon
monoxide is heavier than air and collects at the bottom of
recesses.
• Use a Husqvarna fuel can with an anti-spill device.
WARNING! Use a Husqvarna fuel can with an
anti-spill device. Fuel and fuel fumes are
highly flammable. Think of the risks of fire,
!
Only use the machine in areas with good
ventilation. Neglect can result in serious
injury or death.
explosion and breathing in fumes. Stop the
engine before refuelling. Do not overfill with
fuel. Mop up any spills on the ground or the
machine. If you spill fuel on yourself or your
clothes, change your clothes. Move the
machine at least 3 metres from the refuelling
site before starting.
!
English – 7
SAFETY INSTRUCTIONS
Using
Cutting
WARNING! A safe distance from the cut-off
WARNING!
Never start the saw without the complete bar
and chain fitted.
saw is 15 metres. You are responsible that
animals and onlookers are not in the working
area. Do not start to work with the cut-off saw
before the working area is clear and you
have a firm foothold.
!
!
Wet cutting
The diamond chain saw must always be run with water cooling.
Dry cutting causes immediate overheating and bar and chain
failure with a risk of personal injury. In addition to cooling the
bar and chain, the flow of water pushes particles away from the
bar and the drive links. As a result it is important with a high
water pressure. The water pressure should be at least 2.5 bar
and a maximum of 11 bar. The recommended pressure is
approx. 5 bar.
• Start cutting with the engine at full throttle.
• Always hold the cut-off saw firmly, with both hands.
Hold the machine so that the thumb and fingers grip
around the handle.
Over exposure to vibrations can result in
blood-vessel or nerve injury to persons
suffering with blood circulation problems.
Working speed
Under normal conditions the machine should run at full throttle.
The feed pressure is adjusted so that the speed drops to
approx. 20–30 % under maximum speed; this gives the best
cutting efficiency and economy.
!
Seek medical attention if you experience
physical symptoms that can be related to over
exposure to vibrations. Examples of such
symptoms are numbness, lack of feeling,
“tickling“, “pricking“, pain lack of or a
reduction in normal strength, changes in the
colour of the skin or its surfaces. These
symptoms normally appear in the fingers,
hands or wrists.
Cutting technique
The technique described be-
low is of a general character.
1.Support the work piece
in such a way that you
can predict what will
happen and so it will not
pinch.
2.Always cut at full throttle.
3.Start cutting gently, do
not force or squeeze the
chain in.
4.Use a high chain speed.
5. Move the chain slowly
backwards and forwards.
WARNING!
Under all circumstances avoid cutting using
!
the side of the chain; it will almost certainly
be damaged, break and can cause immense
damage. Only use the cutting section.
WARNING!
Do not lean the saw to the side, this can
!
cause the chain to jam or break with personal
injury as a consequence.
8– English
SAFETY INSTRUCTIONS
Efficient cutting
Safety
Plan the work so that you do
not get crushed by the bar
when the pieces fall apart.
Planning is also extremely
important for your own safety!
As it is usually a question of
large and heavy pieces that
are cut when using the
diamond chain saw the forces
are so great that jamming can
result in irreparable damage
to both the bar and chain.
In principle there are two ways to start the process of entering a
thick object to be cut.
Plunge-cut method
Start by making a 10 centimetre deep cut in the wall using the
lower part of the tip of the bar. Straighten up the saw at the
same time as the tip of the bar is inserted in the slot. Raising
and lowering the saw at the same time as it is pressed into the
wall provides an effective method of cutting to the full depth.
You must plan before you
start to cut how to support the
workpiece according to how
the pieces separate once
cutting has been completed.
In those cases where it is
difficult to calculate how the
pieces will fall apart, or when
it is impossible to support the
workpiece as you would like,
wedging in the cut slot is a
good and safe method.
Cutting holes
A common task for the
diamond chain saw is making
small openings in thick walls.
Pilot method
This method is recommended when attempting to cut
absolutely straight and square.
The order in which the cuts
are made is probably obvious,
but it should be pointed out:
Start with the lowest cut
followed by the sides and
finish with the uppermost cut.
The risk of jamming is then
avoided.
WARNING!
Never use a power cutter with a standard
cutting blade for pilot cutting. The cutting
blade produces a pilot slot that is too thin and
continued cutting with the diamond chain
saw results infallibly in dangerous kickback
and jamming in the slot.
!
It is appropriate to start by securing a board where the cut is to
be made. This serves as a guide for the cut. Cut to a depth of a
few centimetres along the entire line, using the lower section of
the tip of the bar. Go back and cut another few centimetres.
Repeat until a depth of between 5–10 centimetres is reached,
depending on precision demands and the thickness of the object.
The pilot cut guides the bar straight during continued cutting,
which takes place according to the plunge-cut method until full
depth is reached, use a rubber block as a break point/stop.
Bracing
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.
Methods will naturally vary
according to circumstances.
One way is to drill a hole in
the piece to be cut out and
then bolt planks on both
sides.
Pendulum technique
The entire cut is then made using a pendulum motion and the
saw is only held straight at the ends of the cut.
Generally you should attempt to get the chain to cut over
distances that are as small as possible. The partial pressure will
then be higher and the cutting process will then be faster.
English – 9
SAFETY INSTRUCTIONS
Pull in
Water cooling
Pull in occurs when the lower part of the chain is suddenly
stopped or when the cut closes. (To avoid this see the section
”How to avoid kickback” and ”Pinching/rotation” below).
WARNING! Water cooling is only used on
petrol driven diamond chain saws when
cutting concrete to cool the chain and
increases its service life as well as reducing
dust (see the section”Cutting equipment”).
Among the disadvantages are difficulties at
very low temperatures, the risk of damaging
the floor and other sections of the building
and risk for slippage.
!
Pinching/rotation
Pinching occurs when the cut closes. The cut-off saw can be
drawn suddenly and powerfully downwards.
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.
Sharpening diamond chains
Chains can become dull when the wrong feeding pressure is
used or when cutting some materials such as heavily reinforced
concrete. To force a dull chain results in overheating and finally
the loss of segments (part of the chain).
Sharpen against a soft abrasive material such as sandstone or
brick.
Chain vibration
Excessive vibratione can accur if a too high feeding pressure is
used or if the chain is pressed into the work piece.
WARNING!
If the speed is higher than that stated then the
unit must be adjusted by an authorised
service workshop before it is used.
!
Care and storage
A lower feeding pressure ought to stop the vibration. Otherwise
replace the cutting chain.
Kickback
WARNING!
Kickback can occur very suddenly and with
great force. If the following directives are
not followed, it can result in serious or even
fatal injury.
General
!
Husqvarna’s cut-off saws are robust and durable. However, as
they are used for high speed operations all servicing should be
carried out on time and as specified, so that the cut-off saw
always works effectively and safely.
If the sector of the chain illustrated below is used for cutting the
chain can start to climbing and kickback the cut-off saw
upwards and backwards towards the user with immense force.
Read this Operator’s Manual to determine which service
routines you can carry out and ensure that all other service
work is carried out by an authorised service workshop.
How to avoid kickback
1.Never cut with the
segment illustrated in the
diagram.
Always handle the cut-off saw with care and store it with the
cutting equipment removed.
Cutting equipment
• The cutting equipment should be removed from the cutter
after use and stored carefully.
2.Keep a good balance and
a firm foothold.
• Inspect new cutting equipment for transport
or storage damage.
3.Use both hands and take
a firm grip with the thumb
and fingers around the
handle.
Once the work has been completed the diamond chain saw
should be run with water pressure for at least 15 seconds to
clean particles from the bar, chain and drive mechanism. Rinse
off the machine with water.
It is recommended that the chain and bar are oiled to prevent
corrosion if it is not to be used for some time.
4.Keep the work piece at a
comfortable distance.
5.Use the cutter at full
throttle.
6.Take care when inserting
the chain in an existing
cut.
7.Never cut above shoulder
height.
8.Be alert to movement of
the work piece or anything
else that can occur, which
could cause the cut to
close and pinch the chain.
10– English
SAFETY INSTRUCTIONS
Use the saw the right way up
CUTTING EQUIPMENT
For reasons of safety the saw must never be used upside down.
Parts worn loose from the cut object or damaged chain parts
can be thrown towards the operator.
CAUTION! Chain breakage can result in serious injury if
the chain is thrown towards the operator.
Do not cut any material other than what the machine
is intended for
The diamond chain saw is only intended for cutting concrete,
stone, brick and similar material. The saw must never be used
to cut pure metals – this will probably result in broken segments
or chain breakage. The diamond segment can cut reinforced
concrete. Try to cut the reinforcement together with as much
concrete as possible, this will save the chain.
Diamond chains
There are two basic types of diamond chain available on the
market. The difference between these is whether the chain has
rakers on just one side of the diamond segment or on both
sides. When using a chain with one raker, the chain should
always be fitted the right way round, i.e. the raker should guide
the segment at the right height in the cut. When using a chain
with double rakers, the chain can be fitted either way round.
CAUTION! If the chain has been used and is refitted it must be
fitted in the same working direction as earlier in order to reduce
segment wear and to obtain full cutting capacity directly.
Glazing
After cutting extremely hard concrete or stone the diamond
segment may lose some or all of its cutting capacity. This can
also occur if you are forced to cut with a low partial pressure
(the diamond chain runs against the workpiece along the entire
length of the bar). The solution to the problem is to cut in a soft
abrasive material such as sandstone or brick, for a short while.
WARNING!
Under no circumstances may the diamond
chain saw be converted to cut other materials
than those it is intended for. It must never be
equipped with a timber saw chain.
A) Drive link with raker
B) Cutting link with diamond segment
C) Drive link
!
Check the chain
Check that the chain does not show signs of damage in the
form of play on the links, broken raker or drive links or broken
segments.
If the chain has been exposed to hard jamming or other
abnormal overloading, the chain should be dismantled from the
bar for careful inspection.
Fit the chain the right way round
The chain must never be fitted the wrong way round. The raker
should guide the segment at the right height in the cut.
Check the saw
The saw is equipped with a number of safety features that
protect the operator in the event of chain breakage. These
safety features must be checked before work starts. Never use
the saw if any of the following parts are damaged or missing:
– Cover over drive gear
– Damaged or missing hand guard
– Damaged chain
English – 11
WHAT IS WHAT?
What is what on the machine?
1. Cylinder cover
2. Muffler
14. Air filter cover
15. Hand guard
3. Fuel tank
16. Starter handle
17. Operator’s manual
18. Water adjustment valve
19. Front handle
20. Starter
4. Starter throttle catch
5. Choke
6. Throttle trigger lockout
7. Stop switch
8. Bar and chain
21. Decompression valve
22. Rear handle
9. Water hose, quick connection
10. Chain tensioning handle
11. Counter screw
12. Throttle control
13. Combination spanner
23. Warning decal
24. Type plate
25 Allen key
12– English
ASSEMBLY
How to change the chain and rim
How to tension the chain
Press the spring down into the
chain tensioner handle and
turn the nut anti-clockwise.
Untensioned chain.
Unscrew the adjusting nut.
Start with opening the adjust
screw cover.
Pull the handle backwards.
Remove the cover.
Remove the bar and chain.
Continue to move the handle
down-wards until you start to
tension the chain.
Remove the spring holding the
two "half-moons" using a
screwdriver.
Hold the bar upwards as you
move the handle forward.
Remove the "half-moons", the
cup and rim.
Tighten the adjust screw.
Remove the drive wheel.
Close the adjust screw cover.
Assembly takes place in the
reverse order.
English – 13
ASSEMBLY
How to change the clamping force
of the bar
Check weather the handle feel
loose.
Move the lever to its rear,
lower position.
Press in the lever’s spring and
turn the adjusting nut
clockwise.
After adjustment, the chain
tensioner handle should point
nearly straight up (see figure)
when it is moved as far as
possible clockwise.
NOTICE! During all
reassembling, make sure that
the outer cover fits in to the
inner cover, the covers may
be damaged otherwise.
14– English
FUEL HANDLING
Fuelmix
Fuelling
IMPORTANT! 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!The following precautions reduce
the risk of fire:
!
• Do not smoke or place any sources of heat in
the vicinity of the fuel.
• Never refuel when the engine is running.
• Open the fuel cap slowly when fuelling so
that any over pressure is released slowly.
• Tighten the fuel cap carefully after refuelling.
• Always move the machine from the fuelling
place before starting.
Always provide for good ventilation when
handling fuel.
!
Petrol
• Use good quality unleaded
or leaded petrol.
• Keep the handle dry, clean
and free from oil and fuel.
• The lowest octane
recommended is 90 (RON).
If you run the engine on a
lower octane grade than 90
so-called knocking can
occur. This gives rise to a
high engine temperature,
which can result in serious
engine damage
• Clean around the fuel cap.
Clean the fuel tank
regularly. The fuel filter
should be changed at least
once per year
Contamination in the tank
can disrupt operations.
Ensure that the fuel is well
mixed by shaking the
container before filling the
tank.
Two-stroke oil
• For best results and
performance use
HUSQVARNA two-stroke
engine oil, which is specially
formulated for our air-cooled
two-stroke engines.
• Never use two-stroke oil
intended for water-cooled
engines, sometimes
referred to as outboard oil
(rated TCW).
• Always exercise care when
filling the fuel. Move the cut-
off saw at least three metres
from the filling area before
starting. Make sure the fuel
cap is tightened.
• Never use oil intended for
four-stroke engines.
Mixing ratio
1:50 (2%) with HUSQVARNA
two-stroke oil or equivalent.
1:33 (3%) with oils class
JASO FB or ISO EGB
formulated for air-cooled, two-
stroke engines.
Min 3 m
(10ft)
Mixing
• Always mix the petrol and
oil in a clean container
intended for fuel.
• Always start by filling half
the amount of the petrol to
be used. Then add the
entire amount of oil. Mix
(shake) the fuel mixture.
Add the remaining amount
of petrol.
• Mix (shake) the fuel mixture
thoroughly before filling the
saw’s fuel tank.
• Do not mix more than max.
one month’s supply of fuel.
• If the cut-off saw is not used
for some time the fuel tank
should be emptied and
cleaned.
English – 15
START AND STOP
Wet cutting
Start and stop
The diamond chain saw must always be run with water cooling.
Dry cutting causes immediate overheating and bar and chain
failure with a risk of personal injury. In addition to cooling the
bar and chain, the flow of water pushes particles away from the
bar and the drive links. As a result it is important with a high
water pressure. The water pressure should be at least 2.5 bar
and a maximum of 11 bar. The recommended pressure is
approx. 5 bar.
WARNING! Before starting observe the
following:
!
• Do not start the cut-off saw without the
guide bar, chain and side cover fitted.
Otherwise the clutch can come loose and
cause personal injury.
• Always move the cut-off saw from the
filling area before starting.
Start
• Ensure that you and the machine stand
firmly and that the cutting chain can rotate
freely.
• Make sure no unauthorised persons are
within the working area.
WARNING! The cutting chain can rotate when
the engine starts. Make sure it can rotate
freely.
!
Take hold of the front handle
using your left hand. Place
your right foot on the lower
section of the rear handle and
press the cut-off saw against
the ground. Never twist the
starter cord around your
hand.
Starting a cold engine
IGNITION:
Slide the stop switch to the
left.
Grip the starter with your right
hand, and slowly pull the
starter cord out until you feel
some resistance (the pawls
grip) now pull quickly and
powerfully.
CHOKE:
Pull out the choke.
NOTE! Do not pull out the
starter cord completely and do
not release the starter from
the fully extended position.
This can damage the cut-off
saw.
STARTER THROTTLE
CATCH
Press in the throttle control
and thereafter the starter
throttle catch (A). Release the
throttle control and the throttle
is blocked in half throttle
position. The catch is released
when the throttle control is
pressed in all the way.
When the engine starts,
quickly apply full throttle and
the starter throttle catch will
automatically disengage.
DECOMPRESSION VALVE
Press in the valve to reduce
the pressure in the cylinder,
this makes starting the cut-off
saw easier. The decom-
pression valve should always
be used when starting. When
the machine has started the
valve automatically returns to
its original position.
Stop
The engine is stopped by
switching off the ignition.
(Slide the stop switch to the
right.)
Starting a warm
engine
Use the same procedure as
for starting cold engine but
without choke.
16– English
MAINTENANCE
Carburetor
Your Husqvarna product has been designed and manufactured
to specifications that reduce harmful emissions.
After your unit has been run 8-10 tanks of fuel the engine has
broken in. To ensure that your unit is at peak performance and
producing the least amount of harmful emissions after break in,
have your authorized servicing dealer, who has a revolution
counter at his disposal, to check your carburetor for optimum
operating conditions.
Functioning, Final setting
WARNING! Do not start the cut-off saw
without the bar, chain and cover fitted.
!
Operation
Otherwise the clutch can come loose and
cause personal injury.
• The carburetor governs the engine speed via the throttle.
Air/fuel are mixed in the carburetor
Jets
The carburetor is equipped with fixed jets to ensure the engine
always receives the correct fuel air mixture.
If the engine lacks power or accelerates poorly do the following:
• Inspect or, if necessary, replace the air filter.
• If this does not help, contact an authorised service workshop.
Final setting of the idling speed T
Adjust the idling speed with the screw T. If it is necessary to re-
adjust, first turn the idle speed adjusting screw T clockwise, until
the chain starts to rotate. Then turn, counter-clockwise until the
chain stops. A correctly adjusted idle speed setting occurs when
the engine runs smoothly in every position. It should also be
good margin to the rpm when the chain starts to rotate.
Recommended idling speed: 2 500 rpm.
Contact your servicing dealer, if the idle speed
setting cannot be adjusted so that the chain
!
stops. Do not use the cut-off saw until it has
been properly adjusted or repaired.
T
English – 17
MAINTENANCE
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.
• The filter cannot be cleaned but must be replaced with a new
filter when it blocked. The filter should be changed at least
once per year.
Air filter
The air filter should be
cleaned regularly removing
dust and dirt to avoid:
• Carburettor malfunction
• Starting problems
2
1
• Reduced engine power
• Unnecessary wear to
engine parts
A
B
• Abnormal fuel consumption
The air filter system consists
of a main filter and a back-up
filter:
1)The main-filter is an oiled
foam filter that is easily
accessible under the filter
cover A. When used in
dusty conditions, this filter
should be checked/
replaced after every second
tank of fuel. The filter must
be cleaned and oiled
regularly to obtain a
satisfactory filtering effect.
There is a special
HUSQVARNA oil produced
for this purpose.
• Remove the filter. Wash the
filter carefully in tepid,
soapy water. After cleaning
rinse the filter thoroughly in
clean water. Squeeze out
the filter and let the filter
dry. NOTE! Compressed air
at a high pressure can
damage the foam.
• Oil the filter carefully. It is extremely important that the entire
filter is saturated in oil.
2)The back-up filter is a paper filter and is accessible from
under cover B. This filter should be changed/cleaned when
the engine’s output drops or after 1-2 weeks. The filter is
cleaned by shaking or carefully using compressed air. Note
the filter must not be washed!
A filter used for a long period of time can never be completely
cleaned. Therefore all air filters must be replaced periodically
with a new filter. A damaged air filter must always be
replaced.
IMPORTANT INFORMATION!
Insufficient care of the air filter will cause deposits on
the spark plug resulting in abnormal wear to engine
parts.
18– English
MAINTENANCE
Tensioning the recoil spring
Starter
WARNING!
• Lift up the starter cord from
the cut out on the pulley and
turn the pulley approx. 2
turns clockwise.
• The recoil spring sits in its tensioned posi
tion in the starter housing and can with
careless handling fly out and cause personal
injury.
!
• When replacing the recoil spring or the
starter cord great care should be exercised.
Always wear protective glasses.
NOTE! Ensure the starter
pulley can be turned at least
a further 1/2 turn when the
starter cord is fully
extended.
Replacing a broken or worn starter cord
Replacing a broken recoil spring
• Loosen the bolts that hold
the starter against the
crankcase and lift off the
starter unit.
• Lift the starter pulley (see
"Changing a broken or worn
starter cord").
• Loosen the screws holding
the spring cassette.
• Disassemble the recoil
spring by tapping the pully
(with its inside facing down)
lightly against a working
bench or similar. If the
spring pops out when
assembling, it should be
mounted again, out and in
towards the centre.
• Pull out the cord approx. 30
cm and lift it out of the cut-
out in the starter-pulley’s
periphery. Reset the recoil
spring by allowing the pulley
to slowly rotate backwards.
• Lubricate the recoil spring
with thin oil. Assemble the
starter pulley, and tension
the recoil spring.
• Loosen the screw in the
centre of the starter-pulley
and lift off the pulley. Insert
and secure the starter cord
in the starter pulley. Wind
on approx. 3 turns of the
cord on the pulley. Fit the
pulley on the recoil spring
so that the end of the recoil
spring hooks on the pulley.
Fit the screw in the centre of
the pulley. Thread the
starter cord through the hole
in the starter housing and
the starter handle. Tie a
good knot on the end of the
cord.
Fitting the starter
• Fit the starter by first pulling
out the starter cord and then
placing the starter in
position on the crankcase.
No slowly release the
starter cord so that the
pawls grip in the pulley.
• Fit and tighten the screws
that hold the starter.
English – 19
MAINTENANCE
Ignition system
Cooling system
To maintain as low an operating temperature as possible the
cut-off saw is equipped with a cooling system.
IMPORTANT INFORMATION!
This cut-off saw has a green coloured ignition system
with integrated speed governor (order no. 506 02 73-04).
The machine may only be used with such a green
coloured ignition system to prevent the risk of over
revving.
The cooling system consists of:
1. An air intake on the
starter unit.
2. Air flow guide.
5
3. Cooling fins on the
flywheel.
4
Spark plug
The condition of the spark plug
is affected by:
• An incorrect carburetor
4. Cooling fins on the
cylinder
3
0,5 mm
setting.
5. Cylinder cover (leads cold
air onto the cylinder).
• An incorrect fuel mixture
(too much oil).
• A dirty air filter.
2
Clean the cooling system
using a brush at least once
a week, in difficult
conditions more often. A
dirty or blocked cooling
system leads to the engine
overheating resulting in
damage to the cylinder and
piston.
These factors cause deposits
on the spark plug electrode
that may result in malfunction
or starting difficulties.
1
• If the machine is low on
power, difficult to start or
runs poorly while idling
always check the spark
plug first. If the spark plug
is dirty, clean it and at the
same time check that the
electrode gap is 0,5 mm
(.020"). The spark plug
should be changed after
about one month of
operation or earlier if
necessary.
Muffler
The muffler is designed in
order to reduce the noise level
and to direct the exhaust
gases away from the opera-
tor. The exhaust gases are
hot and can contain sparks,
which may cause fire if
NOTE! Always use the recommended type of spark plug. (see
chapter ”Technical data”)! An incorrect spark plug can damage
the cylinder/piston.
directed against dry and
combustible material.
Never use a saw with a
clogged or defective muffler.
20– English
MAINTENANCE
Below follows some general maintenance instructions.
If you need further information please contact your service
workshop.
Daily maintenance
1. Check that throttle components work correctly from a safety
view point (throttle and starter throttle catch).
2. Clean the main filter.
3. Check the sprocket.
4. Check the condition of the bar.
5. Check the condition of the cutting chain.
6. Check the starter and the starter cord; clean the outside of
the starter’s air intake.
7. Check that all nuts and bolts are tightened correctly.
8. Check the function of the stop switch.
9. Lubricate the chain, bar tip sprocket and bar to avoid
corrosion.
Weekly maintenance
10. Check the back-up paper filter.
11. Check that the handles and the anti-vibration elements are
not damaged.
Monthly maintenance
17. Check the clutch drum and clutch springs with regard
to wear.
12. Clean the spark plug. Check that the electrode gap is 0.5 mm.
13. Clean the cooling fins on the flywheel. Check the starter
and recoil spring.
18. Clean the outside of the carburetor
19. Check the fuel filter, fuel hose, change if necessary.
20. Clean the inside of the fuel tank.
14. Clean the cooling fins on the cylinder.
15. Check the muffler.
21. Check all cables and connections.
16. Check the carburetor function.
English – 21
TECHNICAL DATA
K950 Chain
Engine
Cylinder volume, cm3/cu.in
Cylinder bore, mm/inch
Stroke, mm/inch
93,6/5,7
∅ 56/2,2"
38/1,5"
Idle speed, rpm
Recommended max. speed, unloaded, rpm
Power, kW
2 500 rpm
9 750 ± 250
4,5
Ignition system
Manufacturer
Type of ignition system
Spark plug
Electrode gap, mm/inch
FHP
CD
NGK BPMR 7A
0,5 (.020")
Fuel and lubrication system
Manufacturer
Carburetor type
Tillotson
HS 282A
1,0/2,65
Fuel capacity, litre/US Pint
Weight
Without fuel and cutting equipment, kg/Lbs
9,4/20,7
Noise emissions
(see note 1)
Sound power level, measured dB(A)
Sound power level, guaranteed LWA dB(A)
115
116
Sound levels
(see note 2)
Equivalent sound pressure level at the user’s ear, measured
according to EN 1454 and ISO/DIS 11201, dB(A).
103
Vibration levels
Handle vibrations measured according to ISO 19432
Front handle, equivalent value, m/s2
Rear handle, equivalent value, m/s2
4,6
9,3
Note 1: Noise emissions in the environment measured as sound power (LWA) in conformity with EC directive 2000/14/EC.
Note 2: Equivalent sound pressure level is calculated as the time-weighted energy total for sound pressure levels under various
working conditions with the following time distribution: 1/2 idling and 1/2 max speed.
Cutting equipment
Bar and chain
14"
Max. speed
28 m/s at 10 000 rpm
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22– English
TECHNICAL DATA
EU declaration of conformity (Only applies to Europe)
Husqvarna Construction Products, SE-433 81 Partille, Sweden, tel: +46-31949000, declare under sole responsibility that the
cut-off saw Husqvarna K950 Chain from 2006’s serial numbers and onwards (the year is clearly stated in plain text on the type
plate with subsequent serial number), are in conformity with the following standards or other normative documents following the
provisions in the COUNCIL’S DIRECTIVES:
-
-
-
of June 22 1998 “relating to machinery” 98/37/EC, annex IIA.
of May 3 1989 “relating to electromagnetic compatibility” 89/336/EEC, and applicable supplements.
of May 8, 2000 ”relating to the emission of noise to surroundings” 2000/14/EC. Conformity assessment according to Annex V.
For information relating to noise emissions, see the chapter Technical data.
The following standards have been applied: SS-EN ISO 12100:2003, EN-ISO 55012:2002, EN 1454, ISO 19432.
SMP Svensk Maskinprovning AB, Fyrisborgsgatan 3, SE-754 50 Uppsala, Sweden, has carried out voluntary type approval
concerning the directive 2000/14/EC on behalf of Husqvarna AB. The certificate is numbered: 01/169/012 – K950 Chain.
Partille November 14, 2006
Ove Donnerdal, Development Manager.
English – 23
115 02 90-26
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2006-12-18
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