Ryobi Drill Drill Press User Guide

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  
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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 cutters 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 cutters 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  
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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 machines 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.  
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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  
cutters safety equipment should be checked  
and maintained as described in this  
Operators 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 Operators Manual.  
All servicing, in addition to the points listed in the  
section Control, maintenance and service of the  
power cutters 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  
Operators Manual. Ensure the person using the power cutter  
understands the information in this Operators Manual.  
Transport and storage  
Store the power cutter under lock and key so that its 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.  
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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.  
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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  
blades 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 blades  
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.  
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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 kickbackand Pinching/rotationbelow).  
General  
Husqvarnas 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 Operators 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.  
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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 bladesare 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 blades 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 hardereffect.  
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.  
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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 machines 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.  
machines 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  
blades 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 3060  
seconds and let it rotate in the air, for 10 seconds to cool.  
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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. Operators 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  
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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  
saws fuel tank.  
Do not mix more than max.  
one months supply of fuel.  
If the power cutter is not  
used for some time the fuel  
tank should be emptied and  
cleaned.  
14English  
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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 blades  
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.  
!
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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  
engines 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.  
18English  
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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-pulleys  
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.  
20English  
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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 starters 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 users 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  
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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 COUNCILS DIRECTIVES:  
-
-
-
of June 22 1998 relating to machinery98/37/EC, annex IIA.  
of May 3 1989 relating to electromagnetic compatibility89/336/EEC, and applicable supplements.  
of May 8, 2000 relating to noise emissions in the environment2000/14/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.  
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