Operator´s manual
371K 375K
Please read these instructions carefully and make sure
you understand them before using the machine.
English
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CONTENTS
List of Contents
Before using your new Power cutter
• Read the Operator’s Manual carefully.
Symbol explanation..................................................... 2
Safety instructions
• Check the assembly and adjustment of the cutting blade, see
chapter ”Assembly”.
Personal protective equipment ....................................... 4
• Start the engine and check the carburettor settings. See
chapter ”Maintenance”, section ”Carburetor”. When adjusted
correctly the cutting blade 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 power cutter if the idling speed is not correctly
adjusted!
The power cutter’s safety equipment....................... 4
Control, maintenance and service of the machine‘s safety
equipment............................................................................ 5
General safety instructions .............................................. 6
Transport and storage ......................................................... 6
Fuel safety ........................................................................... 7
General working instructions........................................... 7
Cutting ................................................................................. 7
Kickback .............................................................................. 8
Care and storage................................................................. 9
Cutting blades .................................................................... 10
Abrasive discs ................................................................... 10
Cutting blades.................................................................... 11
Diamond blades................................................................. 11
• Let your Husqvarna dealer check the power cutter and carry
out essential adjustments and repairs.
WARNING!
Under no circumstances should you modify
!
the original design of the power cutter without
approval from the manufacturer. Always use
genuine spare parts. Unauthorized
modifications or accessories may lead to
serious injury or death.
What is what?
What is what on a power cutter? ....................................... 12
Assembly
Fitting the cutting head ...................................................... 13
Checking the drive shaft and flanges ................................ 13
Fitting the cutting blade ..................................................... 13
WARNING!
Use of products which cut, grind, drill, sand or
!
shape material can generate dust and vapors
Fuel handling
which may contain harmful chemicals. Know
the nature of the material being worked on
and wear appropriate dust mask or respirator
protection.
Fuel mixture....................................................................... 14
Fuelling .............................................................................. 14
Start and stop
Start and stop .................................................................... 15
Maintenance
Adjusting the drive belt ...................................................... 16
Changing the drive belt ..................................................... 16
Carburettor ........................................................................ 17
Fuel filter............................................................................ 18
Air filter .............................................................................. 18
Starter................................................................................ 19
Spark plug ......................................................................... 20
Muffler ............................................................................... 20
Cooling system .................................................................. 20
Daily maintenance ............................................................. 21
Weekly maintenance ......................................................... 21
Monthly maintenance ........................................................ 21
Technical Data
371K .................................................................................. 22
375K .................................................................................. 22
English – 3
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SAFETY INSTRUCTIONS
THE POWER CUTTER’S SAFETY
EQUIPMENT
WARNING! Incorrect or careless use of a
power cutter 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 power cutter’s safety equipment, its
function and how checks and maintenance are carried out to
ensure that it operates correctly. (See the chapter “What is
what“ to locate where this equipment is positioned on your
power cutter.)
PERSONAL PROTECTIVE EQUIPMENT
WARNING! Never use a power cutter with
defective safety equipment. Follow the
WARNING! When using a power cutter,
!
control, maintenance and service instructions
approved protective equipment must be used.
!
described in this manual.
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.
1 Anti-vibration
system
• PROTECTIVE HELMET
• EAR PROTECTION
• PROTECTIVE GLASSES
OR FULL FACE
Your power cutter is equipped
with an anti-vibration system.
This is designed to give as low
vibration levels and
PROTECTION
comfortable usage as possible.
• BREATHING MASK
• HEAVY-DUTY, FIRM GRIP
GLOVES
The power cutter’s anti-
vibration system reduces the
transfer of vibration between
the engine/cutting equipment
and the cutting trolley. The
engine body including the
cutting equipment is
• SNUG-FITTING, HEAVY-
DUTY, COMFORTABLE
CLOTHING THAT ALLOWS
FULL FREEDOM OF
MOVEMENT
suspended in a handle system
via anti-vibration elements.
• LEG PROTECTION (TO
PROTECT AGAINST
SPARKS AND CUTTING
FRAGMENTS)
• ANTI-SLIP BOOTS WITH
STEEL TOE CAPS
2 Stop switch
The stop switch should be
used to stop the engine.
• FIRST AID KIT SHOULD
ALWAYS BE ON HAND
4– English
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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
power cutter require special training. This
applies especially to the power cutter’s safety
!
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.
equipment. If the power cutter does not meet
any of the controls listed below you should
contact your service workshop.
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.
MPORTANT 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 carcinogenic. Avoid
contact with these elements in the event of a
damaged muffler.
!
4 Throttle lock
The throttle lock is designed
to prevent accidental opera-
tion of the throttle control.
When you press the lock (A)
Check that the anti-vibration
elements are securely
mounted between the engine
unit and the handle system.
(i.e. when you grasp the
A
handle) it releases the throttle
trigger (B). 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 arrange-
B
ment means that the throttle
control is automatically locked
at the idle setting when you
release the handle.
2 Stop switch
5 Blade guard for the cutting blade
Start the engine and make
sure that the engine stops
when the stop switch is
WARNING! Always check that the blade guard
is correctly fitted before starting the machine.
!
The blade guard is mounted
above the cutting blade and
prevents cutting fragments
from being thrown towards the
user.
moved to the stop position.
English – 5
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SAFETY INSTRUCTIONS
5 Blade guard for the cutting blade
3 Muffler
Never use a defective blade
guard or a blade guard that is
not fitted correctly.
Never use a machine that
has a defective muffler.
Check regularly that the
muffler is secured to the
engine body.
WARNING! Check that the cutting blade is
fitted correctly and does not show signs of
damage. A damaged cutting blade can cause
personal injury.
!
WARNING! Never use a power cutter with
defective safety equipment. The power
cutter’s safety equipment should be checked
and maintained as described in this
Operator’s Manual. If your power cutter does
not meet any of these controls you should
contact your service workshop.
!
4 Throttle lock
1
Make sure the throttle
control is locked at the
idle setting when you
release the throttle lock.
GENERAL SAFETY INSTRUCTIONS
IMPORTANT INFORMATION!
Do not use the power cutter 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
power cutter’s safety equipment”, should be carried
out by trained service specialists.
2
3
Press the throttle lock and
make sure it returns to its
original position when you
release it.
• Use the equipment recommended in the chapter ”Personal
safety equipment”.
• Never use the machine when you are tired, under the
influence of medicines/drugs or alcohol.
Check that the throttle
control and throttle lock
move freely and that the
return springs work
properly.
• Do not lend the power cutter to anyone without providing this
Operator’s Manual. Ensure the person using the power cutter
understands the information in this Operator’s Manual.
Transport and storage
• Store the power cutter under lock and key so that it’s out of
reach for children and unauthorised persons.
• Do not store or transport the power cutter with the cutting
blade fitted.
4
Start the power cutter and
apply full throttle. Release
the throttle control and
check that the blade stops
and remains stationary. If
the blade rotates when
the throttle is on idle
setting you should check
the carburettor idle
adjustment. See the
section on ”Maintenance”.
6– English
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SAFETY INSTRUCTIONS
GENERAL WORKING INSTRUCTIONS
Fuel safety
This section takes up the basic safety precautions for working
with the power cutter. Follow these general working instructions,
but never use a machine without the possibility of calling for
help in the event of an accident.
(Filling/Fuel mixture/Storage)
WARNING! Exercise great care when handling
fuel. Bear in mind the risk of fire, explosions
and inhaling fumes.
!
• Never fill the machine while
Basic safety precautions
IMPORTANT INFORMATION! Never work with a power
cutter that is defective or incorrectly adjusted. Do not
work with a power cutter that is incomplete or where
assembly has not been carried out in a satisfactory
manner. Check that the cutting blade stops rotating
when the throttle is released. If you encounter a situation
where you are uncertain how to proceed you should ask
an expert.
the engine is running.
• Provide good ventilation
when filling or mixing fuel
(petrol 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 power cutter.
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 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.
• Store the power cutter 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 blade when the engine is started.
• Maintain a safe distance from the cutting blade when the
engine is running.
• When storing fuel, approved containers intended for this
purpose must be used.
• The blade guard should always be fitted when the engine is
running.
• Ensure that the working area is sufficiently illuminated to
create a safe working environment.
• When storing the power cutter for long periods the fuel tank
must be emptied. Contact your local petrol station to find out
how to dispose of excess fuel.
• Check the cutting area for buried cables and wires.
• Use a Husqvarna fuel can with an anti-spill device.
Only use the machine in areas with good
ventilation. Neglect can result in serious
WARNING! Fuel and fuel fumes are highly
flammable. Think of the risks of fire, explo-
injury or death.
!
sion 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.
Cutting
WARNING! A safe distance from the power
cutter is 15 metres. You are responsible that
!
animals and onlookers are not in the working
area. Do not start to work with the power
cutter before the working area is clear and
you have a firm foothold.
• Start cutting with the engine at full throttle.
• Always hold the power cutter firmly, with both hands. Hold
the machine so that the thumb and fingers grip around the
handle.
English – 7
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SAFETY INSTRUCTIONS
Water cooling
WARNING! Over exposure to vibrations can
result in blood-vessel or nerve injury to
persons suffering with blood circulation
problems. 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.
WARNING! Water cooling, which is only used
for petrol-driven power cutters and when
cutting concrete, cools the cutting blade and
increases its service life as well as reduce
dust formation (see the section ”Abrasive
blades”). 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.
!
!
Sharpening diamond blades
Blades can become dull when the wrong feeding pressure is
used or when cutting some materials such as heavily reinforced
concrete. To force a dull blade results in overheating and finally
the loss of segments (part of the blade).
Cutting technique
The technique described below is of a general character. Check
information for each blade regarding individual cutting characte-
ristics. (For example, a diamond blade requires less feeding
pressure than a abrasive blade).
Sharpen against a soft material such as sandstone or haydite
brick.
1.Support the work piece in
such away that you can
predict what will happen
and so it will not pinch.
Blade vibration
The blade can become out of shape (not round) and vibrate if a
too high feeding pressure is used or if the blade is pressed into
the work piece.
2.Always cut at full throttle.
A lower feeding pressure ought to stop the vibration. Otherwise
replace the cutting blade.
3.Start cutting gently, do
not force or squeeze the
blade in.
Kickback
4.Use a high blade speed.
WARNING!
Kickback can occur very suddenly and with
5.Move the blade slowly
backwards and forwards.
great force. If the following directives are not
!
followed, it can result in serious or even fatal
injury.
6.Use a small part of the
blade’s cutting edge.
If the sector of the blade illustrated below is used for cutting the
blade can start to climbing and kickback the power cutter
upwards and backwards towards the user with immense force.
7.Only use the blade’s
cutting edge when
cutting.
How to avoid kickback
1.Never cut with the
segment illustrated in the
diagram.
8.Cut with the blade fully
vertical – at right angles
to the work piece.
2.Keep a good balance and
a firm foothold.
3.Use both hands and take
a firm grip with the thumb
and fingers around the
handle.
4.Keep the work piece at a
comfortable distance.
5.Use the cutter at full
throttle.
WARNING!
Under all circumstances avoid cutting using
the side of the blade; it will almost certainly
be damaged, break and can cause immense
damage. Only use the cutting section.
6.Take care when inserting
the blade in an existing
cut.
!
7.Never cut above shoulder
height.
WARNING!
8.Be alert to movement of
the work piece or anything
else that can occur, which
could cause the cut to
Do not lean the blade to the side, this can
cause the blade to jam or break with personal
injury as a consequence.
!
close and pinch the blade.
8– English
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SAFETY INSTRUCTIONS
Pull in
Care and storage
Pull in occurs when the lower part of the blade is suddenly
stopped or when the cut closes. (To avoid this see the section
”How to avoid kickback” and ”Pinching/rotation” below).
General
Husqvarna’s power cutters 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 power cutter
always works effectively and safely.
Pinching/rotation
Pinching occurs when the cut closes. The power cutter can be
drawn suddenly and powerfully downwards.
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 pinching
Support the work piece in
such a way that the cut
remains open during the
cutting operation and when
the cut is finished.
Power Cutter
Always handle the power cutter with care and store it with the
blade removed.
Drying the blade
Blades
After using an abrasive blade
with water cooling, let the
cutter run at full throttle for
approx. half a minute so that
the blade dries.
• All blades should be
removed from the cutter
after use and stored
carefully.
• Special care should be
taken with abrasive
blades.
If a damp blade is stored it
can become unbalance and
cause damage.
• Blades must be stored on
a firm, level surface. If
blades are supplied with a
backing pad then a spacer
should be used to keep
them flat.
Check the speed of the
drive shaft
Use a tachometer regularly to
check the speed of the drive
shaft when the cutter is
running at working tempera-
ture and at full throttle without
a load. The maximum speed
is stated on the unit.
• Avoid moisture and
temperature extremes.
• Remove the blades before
the cutter is moved or
transported.
WARNING!
If the speed is higher than that stated then the
• Inspect new blades for
transport or storage
damage.
!
unit must be adjusted by an authorised
service workshop before it is used.
English – 9
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SAFETY INSTRUCTIONS
Abrasive discs
CUTTING BLADES
The cutting material on abrasive discs consists of grit bonded
using an organic binder. ”Reinforced blades” are made up of a
fabric or fibre base that prevents total breakage at maximum
working speed if the blade should be cracked or damaged. (The
term reinforced does not refer to those cutting blades that are
only reinforced around the flange).
A cutting blade’s performance is determined by the type and
size of abrasive corn, and the type and hardness of the bonding
agent.
Characteristics that give the blade a shorter service life and
greater cutting capacity are said to make the blade ”softer”. A
blade with a longer service life and slower cutting capacity is a
blade with a ”harder” effect.
High quality cutting blades are normally more economical.
Lower quality cutting blades usually have an inferior cutting
capacity and shorter service life, which results in higher cost per
processed material.
General
Cutting blades are available in two basic designs; abrasive
discs and diamond blades. Only abrasive discs and diamond
blades may be used and only within their respective application
areas.
ABRASIVE DISCS, TYPES AND USES
Use
General
Material
Water cooling
WARNING!
Blade
type
characteristics
A cutting blade may burst and cause injury to
!
the operator.
Universal
usage,
economical.
Concrete,
asphalt,
stone,
brickwork,
cast iron,
aluminium,
copper,
Can be used to
reduce dust.
The disc should
not be stored
after cutting is
complete as
Con-
crete
High speed portable tools
Our cutting blades are manufactured for high-speed, portable
power cutters. If blades from other manufacturers are used,
ensure that the blades conform to all regulations and demands
that concern this type of power cutter.
water affects the
brass, cables, strength of the
rubber, etc.
disc while
stored.
WARNING!
Never use a cutting blade at a lower speed
!
rating than that of the power cutter.
Special blades
Unbeatable for
steel (not
suitable for
NOT
recommended.
Steel, steel
alloys and
other hard
metals.
Metal
Some cutting blades are designed for stationary equipment and
for use with attachments.Such cutting blades must not be used
on portable power cutters.
concrete, etc.)
WARNING!
Never use a cutting blade for any other
purpose than that it was intended for.
!
Always contact local authorities and make sure you are
following applicable directives.
10– English
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SAFETY INSTRUCTIONS
Type of cutting blades
The cutting blade should be
marked with the same or a
higher speed than that stated
on the machine’s rating plate.
Never use a cutting blade
with a lower speed rating than
what is stated on the
Guard
Check that the guard is not
cracked or shows signs of any
other damage. Clean the
inside of the guard before
fitting a new blade. Check that
the guard can be adjusted.
machine’s rating plate.
Damage
Diamond blades
• Ensure the blade it not
cracked or damaged in any
other way.
Diamond blades consist of a steel body with segments that
contain industrial diamonds
• Test the abrasive disc by
hitting it lightly with a piece
of wood. If the blade does
not give a full-sounding ring
then it is damaged.
DIAMOND BLADES, TYPES AND USES
Material
Diamond General char-
Water cooling
blade
acteristics
• Never use a blade that has
fallen on the floor.
All brickwork,
reinforced
concrete and
other
composite
materials.
NOT
Low cost per
cutting opera-
tion. Fewer
blade changes.
Constant
cutting depth.
Less dust.
Increases the
blade’s service
life
Assembly
• Check that the blade is
fitted correctly and is
secure.
recommended
for metal.
• Follow all specifications in
the table below.
WARNING!
Cool diamond blades continuously with
water to prevent overheating that can cause
the blade to break and pieces being thrown
off resulting in injury and damage.
!
Specifications for fitting blades
Standard blades
centre hole
(spindle)
inches
mm
.787 7/8
20 22,2 25,4
1
Using diamond blades
Proceed as follows:
• Let the cutting blade rotate in the same direction as the
arrow markings indicate.
Reducing bush*
Max. thickness Blade thickness
Min thickness
3 mm (1/8")
• Cool continually with water.
Backing pad
(Must be used)
Material
Highly compressible,
e.g. blotting paper
• Keep the cutting blade sharp.
Max. thickness 0,5 mm (.020")
Play 0,2 mm (.010")
• Remove the cutting blade when the machine is transported.
Spindle hole/
drive shaft
Avoid:
• Running the cutting blade in the wrong direction.
Flange tightening The bolt is tightened to 15-25 Nm
• Forcing a dull blade or wedging the blade into a cut.
• Transporting the power cutter with the blade fitted.
• Letting the blade fall on the work piece.
Blade/guard
Check that the blade runs free of the
guard.
Diamond blades for dry cutting
* Plastic reducing bushes may only be used with abrasive
discs. Do not use reducing bushes with diamond blades or
tungsten carbide blades.We recommend that the spindle is
replaced so that it fits the blades to be used rather than using
a reducing bush. Contact your service workshop for details.
Diamond blades for dry cutting are a new generation of blades
that do not require water cooling. However, the blades are still
damaged by excessive heat. It is good economics to let the
blade cool by simply lifting the blade from the cut every 30–60
seconds and let it rotate in the air, for 10 seconds to cool.
English – 11
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WHAT IS WHAT?
22
19
14
1
5
6
15
18
2
21
20
11
16
3
23
7
4
8
10
9
12
13
17
What is what on a power cutter?
1. Cylinder cover
13. Combination spanner
14. Air filter cover
2. Muffler
3. Fuel tank
15. Blade guard
4. Rear handle
5. Choke / Throttle trigger lockout
6. Throttle catch
7. Stop switch
16. Starter handle
17. Operator’s manual
18. Adjustment lever for blade guard
19. Front handle
8. Cutting head
9. Cutting arm
20. Starter
21. Decompression valve
22. Warning decal
10. Belt tensioning screw
11. Cutting blade
12. Throttle
23. Type plate
12– English
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ASSEMBLY
Fitting the cutting head
Fitting the cutting blade
Remove the bolt (1) and nut
(2). Remove the cover. Fit the
drive belt over the clutch
drum. Refit the cover and
tighten the bolt (1) and nut (2).
Husqvarna cutting blades are
manufactured and approved
for freehand cutting. The
paper labels on each side of
the blade are there to
distribute the pressure from
the flange washer and prevent
the blade from slipping.
The blade is placed between
the flange hub (A) and the
flange washer (B). The flange
washer is turned so that it fits
in the flange hub. The cutting
blade is tightened using the
socket spanner 501 69 17-02.
2
1
A
B
The shaft can be locked using
a screwdriver, steel pin or the
like. This is slid in as far as
possible. The blade is tighte-
ned clockwise.
Feed the drive belt over the
pulley on the cutting head.
Tightening torque for the bolt
holding the blade is:
15-25 Nm (130-215 in.lb).
Secure the cutting head
together with the belt guard.
Tighten both bolts slightly,
then loosen 1/2 turn.
Screw in the tensioning screw
(3) so that the square nut is in
line with the arrow on the belt
guard. Shake the head to
ensure the spring can tension
the belt. This automatically
adjusts the belt to the correct
tension. Tighten both bolts (4)
using the combination
spanner.
NOTE!
After fitting a new belt the belt
tension must be readjusted
after the first two tanks of fuel
have been used.
Blade guard
The blade guard should
always be fitted on the
power cutter.
3
The guard should be adjusted
so that the rear section is
close to the work piece.
Cutting fragments and sparks
are then collected by the
guard and led away from the
user. By using the lever (A)
the guard can be loosened
and set in the required
position.
A
4
Checking the drive shaft and flanges
• Check that the threads on
the drive shaft are
undamaged.
• Check that the contact
surfaces of the cutting blade
and flanges are flat, run
correctly on the spindle and
are free from foreign
objects.
Do not use flanges that are
twisted, have damaged
edges, untrue or dirty. Do
not use different size
flanges.
English – 13
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FUEL HANDLING
Fuelmix
Fuelling
IMPORTANT! The power cutter is equipped with a two-stroke
engine and must always been run using a mixture of petrol 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.
• The lowest octane
recommended is 90.
• Keep the handle dry, clean
and free from oil and fuel.
• 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 the best results use
HUSQVARNA two-stroke
oil, which is especially
developed for power
Gasolin
Benzin
Essence
Gasolina
Lit.
Oil • Öl
Huile • Aceite
Lit.
cutters. Mixing ratio 1:50
(2%).
2%(1:50) 3%(1:33) 4%(1:25)
• If HUSQVARNA two-stroke
oil is not available, you may
use another two-stroke oil of
good quality that is intended
for air cooled engines.
Contact your dealer when
selecting an oil. Mixing ratio
1:33 (3%)-1:25 (4%).
0,10
0,20
0,30
0,40
0,15
0,30
0,45
0,60
US
fl. oz.
0,20
0,40
0,60
0,80
5
10
15
20
US
gallon
• Always exercise care when
filling the fuel. Move the
power cutter at least three
metres from the filling area
before starting. Make sure
the fuel cap is tightened.
2%(1:50) 3%(1:33) 4%(1:25)
2 1/2
6 1/2
12 7/8
3 3/4
9 3/4
19 1/4
5 1/8
12 7/8
25 3/4
1
2 1/2
5
• Never use two-stroke oil
intended for water cooled
outboard engines, so-called,
outboard oil.
• Never use oil intended for
four-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 power cutter is not
used for some time the fuel
tank should be emptied and
cleaned.
14– English
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START AND STOP
Start
Start and stop
WARNING! Before starting observe the
following:
WARNING! The cutting blade can rotate when
the engine starts. Make sure it can rotate
freely.
!
!
• Do not start the power cut without the cutting arm or
cutting head fitted. Otherwise the clutch can come
loose and cause personal injury.
• Always move the power cutter from the filling area
before starting.
• Ensure that you and the machine stand firmly and that
the cutting blades rotates freely.
• Make sure no unauthorised persons are within the
working area.
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 power cutter against
the ground. Never twist the
starter cord around your
hand.
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.
Starting a cold engine
IGNITION:
Slide the stop switch to the
left.
NOTE! Do not pull out the
starter cord completely and do
not release the starter from
the fully extended position.
This can damage the power
cutter.
CHOKE:
Pull out the choke.
DECOMPRESSION VALVE
Press in the value to reduce
the pressure in the cylinder,
this makes starting the power
cutter easier. The
decompression valve should
always be used when starting.
When the machine has
When the engine starts,
quickly apply full throttle and
the starter throttle catch will
automatically disengage.
started the value automatically
returns to its original position.
FAST IDLE:
Stop
Combined choke/fast idle is
received when the choke is
moved to choke position.
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. Fast idle is
recived by first set the choke
control in choke position, and
then back again.
English – 15
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MAINTENANCE
Belt pulley and clutch
Adjusting the drive belt
Never start the engine when the belt pulley and clutch are
removed for maintenance.
• The drive belt is fully
enclosed and well protected
from dust, dirt and
mechanical effects during
the cutting process.
A
• To tension the drive belt,
slightly loosen the bolts (A),
which secure the cutting
head and belt guard.
• Turn the tensioning screw
so that the nut (B) is located
directly under the arrow on
the cover. Shake the head
to ensure the spring can
tension the belt. The belt
now automatically has the
right tension.
B
• Tighten the bolts that hold
the cutting head.
B
IMPORTANT INFORMATION! A new drive belt should be
tensioned after using one tank of fuel.
Changing the drive belt
• Loosen the two bolts (A).
• Turn the tensioning screws
(B) until the tension has
been released.
A
• Remove the two bolts (A).
• Remove the front belt cover
(C).
• Remove the belt from the
pulley.
C
B
E
• Dismantle the cutting head.
• Remove bolt (E) and nut
(D). Remove the side cover.
• Replace the drive belt.
• To assemble reverse the
procedure for dismantling.
• Check the cutting blade’s
blade guard for signs of
cracking or other damage.
Replace it if damaged.
D
WARNING! Never use a power cutter without a
blade guard over the cutting blade.
!
16– English
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MAINTENANCE
Conditions
Carburettor
• Before any adjustments are made the air filters should be
clean and the cylinder cowling fitted. Adjusting the carburettor
while a dirty air filter is in use will result in a leaner mixture
when the filter is finally cleaned. This can give rise to serious
engine damage.
• Carefully turn the L and H needle to the mid point.
• Do not attempt to adjust the needles beyond the stops as
damage can occur.
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 adjust your carburettor for optimum
operating conditions.
• Now start the engine according to the starting instructions
and run it warm for 10 minutes.
NOTE! If the disk rotates the T screw should be turned
counter-clockwise until the disk stops.
Functioning, Basic setting, Final setting
• Place the engine on a flat surface so that the disk points
away from you and so that the disk do not come into contact
with the surface or other objects.
WARNING! Do not start the power cutter
without the cutting arm or cutting head fitted.
!
Otherwise the clutch can come loose and
cause personal injury.
Low speed needle L
Turn the low speed needle L clockwise until the stop. If the
engine has bad acceleration or erratic idling, turn the L needle
counter-clockwise until good idling and acceleration.
Operation
• The carburettor governs the engine speed via the throttle. Air/
fuel are mixed in the carburettor.
NOTE! If the disk rotates in the idling position, turn the
idling speed screw counter-clockwise until the disk stops.
Govenor
The engine is equipped with in the ignition built in non
adjustable electronic speed limiter. The limiter prevents the
engine from being ran at a too high RPM.
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 disk starts to rotate. Then turn, counter-clockwise until the
disk 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 disk starts to rotate.
H
T
• The carburettor has three
adjustment possibilities:
Contact your servicing dealer, if the idle speed
setting cannot be adjusted so that the disk
stops. Do not use the engine until it has been
properly adjusted or repaired.
L = Low speed jet.
H = High speed jet.
T = Adjustment screw for
idling.
!
L
Correctly adjusted carburettor
A correctly adjusted carburettor means that the engine
accelerates without hesitation. Furthermore, the disk must not
rotate at idling. A too lean adjusted low speed needle L may
cause starting difficulties and bad acceleration. A too lean
adjusted high speed needle H gives lower power=less capacity,
bad acceleration and/or damage to the engine. A too rich
adjustment of the two speed needles L and H gives accelera-
tion problems or too low working speed.
• The T screw regulates the idling speed. If the screw T is
turned clockwise this gives a higher idling speed; counter-
clockwise a lower idling speed.
Basic setting and running in
The carburettor is set to its basic setting when test run at the
factory. Fine adjustment should be carried out by a skilled
technician.
NOTE! If the disk rotates while idling the T screw should be
adjusted counter-clockwise until it stops.
Recommended idling speed: 2 500 rpm.
Contact your servicing dealer, if the idle speed
setting cannot be adjusted so that the disk
!
stops. Do not use the engine until it has been
properly adjusted or repaired.
English – 17
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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
• Reduced engine power
• Unnecessary wear to
engine parts
2
1
A
The air filter system consists
of a backup filter (1) and a
main filter (2):
1) The main filter is an oiled
foam rubber filter that is
easily accessible under the
filter cover (A). In dusty
B
conditions this filter should
be inspected/replaced each
week. In order to obtain a
good filtering effect, the filter
must be cleaned and oiled
regularly. Special
HUSQVARNA oil has been
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 backup filter is a paper filter accessible from under
cover B. This filter should be replaced/cleaned when the
engine’s power drops or each month. The filter is cleaned
by shaking or by careful blowing with compressed air. Note
that 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
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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
Changing the 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").
• Dissasemble 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.
• Undo the bolt in the centre
of the pulley and remove
the pulley. Insert and secure
a new starter cord in the
starter pulley. Wind approx.
3 turns of the starter cord on
the starter pulley. Fit the
starter pulley against the
starter so that the end of the
return spring hooks into the
starter housing. Fit the bolt
into the centre of the starter
pulley. Carry the starter
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.
cord through the hole in the
starter housing and the
starter handle. Tie a good
knot on the starter cord.
• Fit and tighten the screws
that hold the starter.
English – 19
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MAINTENANCE
Spark plug
Cooling system
To maintain as low an operating temperature as possible the
power cutter is equipped with a cooling system.
The condition of the spark plug
is affected by:
• An incorrect carburettor
setting.
• An incorrect fuel mixture
(too much oil).
The cooling system consists of:
0,5 mm
1. An air intake on the
starter unit.
• A dirty air filter.
2. Air flow guide.
5
These factors cause deposits
on the spark plug electrode
that may result in malfunction
or starting difficulties.
3. Cooling fins on the
flywheel.
4
4. Cooling fins on the
cylinder
3
• 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
5. Cylinder cover (leads cold
air onto the cylinder).
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.
2
1
operation or earlier if
necessary.
NOTE! Always use the recommended type of spark plug. (see
chapter ”Technical data”)! An incorrect spark plug can damage
the cylinder/piston.
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
directed against dry and
combustible material.
Never use a saw with a
clogged or defective muffler.
20– English
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MAINTENANCE
8
10
15
16
3
13
1
7
18
19
5
4
11
17
Below follows some general maintenance instructions.
If you need further information please contact your service
workshop.
8
15
Daily maintenance
12
1. Check that throttle components work correctly from a safety
view point (throttle and starter throttle catch).
2. Check the tension of the drive belt.
3. Check the condition of the cutting blade.
4. Check the condition of the blade guard.
5. Check the starter and the starter cord; clean the outside of
the starter’s air intake.
6. Check that all nuts and bolts are tightened correctly.
7. Check that the short-circuiting contact functions.
14
6
2
9
3
Weekly maintenance
8. Clean the main filter.
9. Check that the handles and anti-vibration elements are not
damaged.
Monthly maintenance
15. Clean the backup filter.
10. Clean the spark plug. Check that the electrode gap is 0.5
mm.
16. Check the clutch drum, drive-pulley, and clutch springs with
regard to wear.
11. Clean the cooling fins on the flywheel. Check the starter
and recoil spring.
17. Clean the outside of the carburettor
18. Check the fuel filter, fuel hose, change if necessary.
19. Clean the inside of the fuel tank.
12. Clean the cooling fins on the cylinder.
13. Check the muffler.
14. Check the carburettor.
20. Check all cables and connections.
English – 21
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TECHNICAL DATA
371K
375K
Engine
Cylinder volume, cu.in/cm3
Cylinder bore, inch/mm
Stroke, inch/mm
70,7
Ø 50
36
74,7
Ø 51,4
36
Idle speed, rpm
Max. speed, unloaded, rpm
Power, kW
2 500
9 800 250
3,5
2 500
9 800 250
3,7
Ignition system
Manufacturer
Type of ignition system
Spark plug
SEM
CD
Champion RCJ-7Y
NGK BPMR 7
0,5
SEM
CD
Champion RCJ-7Y
NGK BPMR 7
0,5
Electrode gap, inch/mm
Fuel and lubrication system
Manufacturer
Carburettor type
Walbro
HD 20
0,77
Walbro
HD 20
0,77
Fuel capacity, US pint/litre
Weight
Without fuel and cutting blade, Lbs/kg
12" (∅ 300 mm)
14" (∅ 300 mm)
9,4
–
–
9,7
Noise emissions
(see note 1)
Sound power level, measured dB(A)
Sound power level, guaranteed LWA dB(A)
114
115
116
116
Sound levels
(see note 2)
Equivalent noise pressure level at the user’s ear,
measured according to EN 1454, dB(A).
102
102
Vibration levels
Handle vibrations measured according to EN 1454,
m/s2
12" (∅ 300 mm)
14" (∅ 350 mm)
Front handle, idling, m/s2
Front handle, full speed, m/s2
Rear handle, idling, m/s2
Rear handle, full speed, m/s2
4,9
3,0
5,6
4,0
6,5
2,7
9,2
4,6
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
Cutting blade
12"
14"
Gear ratio
0,52
0,52
Max. peripherical speed
80 m/s
100 m/s
´®z+H2^¶6`¨
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TECHNICAL DATA
EU declaration of conformity(Only applies to Europe)
Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel. +46-36-146500, declare under sole responsibility that the power cutters
Husqvarna 371K and 375K, with serial numbers from year 2002 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 noise emissions in the environment” 2000/14/EC.
For information relating to noise emissions, see "TECHNICAL DATA".
The following standards have been applied: EN292-2, CISPR 12:1997, EN 1454
SMP Svensk Maskinprovning AB, Fyrisborgsgatan 3, SE-754 50 Uppsala, Sweden, has carried out voluntary type approval for
Husqvarna AB. The certificate is numbered: 01/169/005 – 371K, 01/169/013 – 375K.
Partille 3 April 2003
Ove Donnerdal, Development Manager.
English – 23
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