Jonsered Brush Cutter RS52 User Manual

Operator’s manual (EPA)  
Please read the operator’s manual carefully and  
make sure you understand the instructions  
before using the machine.  
GR41 GR50 RS44 RS52  
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CONTENTS  
Contents  
Note the following before starting:  
KEY TO SYMBOLS  
Please read the operator’s manual carefully.  
Symbols .......................................................................  
CONTENTS  
Maintenance, replacement, or repair of the emission control  
devices and system may be performed by any nonroad  
engine repair establishment or individual.  
Contents ......................................................................  
Note the following before starting: ................................  
INTRODUCTION  
WARNING! Long-term exposure to noise can  
Dear customer! ............................................................  
WHAT IS WHAT?  
5
6
result in permanent hearing impairment. So  
always use approved hearing protection.  
!
What is what on the clearing saw? (GR41/GR50/RS44)  
WHAT IS WHAT?  
WARNING! Under no circumstances may the  
design of the machine be modified without  
the permission of the manufacturer. Always  
use genuine accessories. Non-authorized  
modifications and/or accessories can result  
in serious personal injury or the death of the  
operator or others.  
What is what on the clearing saw? (RS52) ..................  
GENERAL SAFETY PRECAUTIONS  
Important ......................................................................  
Personal protective equipment .....................................  
Machines safety equipment ........................................  
!
Cutting equipment ........................................................ 11  
ASSEMBLY  
Your warranty may not cover damage or  
liability caused by the use of non-authorized  
accessories or replacement parts.  
Assembling the handlebar and throttle ........................ 13  
Transport position, handlebar ...................................... 13  
Assembling the cutting equipment ............................... 13  
Fitting a blade guard, grass blade and grass cutter ..... 13  
Fitting the blade guard and saw blade ......................... 14  
Fitting the trimmer guard and trimmer head Trimmy SII 14  
Fitting other guards and cutting attachments ............... 15  
Adjusting the harness and clearing saw ...................... 15  
Standard harness ........................................................ 15  
Vector harness ............................................................. 16  
FUEL HANDLING  
WARNING! A clearing saw, brushcutter or  
trimmer can be dangerous if used  
incorrectly or carelessly, and can cause  
serious or fatal injury to the operator or  
others. It is extremely important that you  
read and understand the contents of this  
operator’s manual.  
!
Fuel safety ................................................................... 17  
Fuel .............................................................................. 17  
Fueling ......................................................................... 18  
STARTING AND STOPPING  
JONSERED HUSKVARNA SWEDEN  
IMPORTANT ENGINE INFORMATION  
TWC  
THIS ENGINE CONFORMS TO U.S. EPA PH1  
FOR SMALL NON - ROAD ENGINES.  
REFER TO OPERATOR`S MANUAL FOR  
MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.  
Check before starting ................................................... 19  
Starting and stopping ................................................... 19  
WORKING TECHNIQUES  
This label certify that the product has been certified in  
accordance with American exhaust requirements EPA 1.  
General working instructions ....................................... 21  
MAINTENANCE  
Carburetor .................................................................... 25  
Muffler .......................................................................... 27  
Cooling system ............................................................ 27  
Air filter ......................................................................... 27  
Bevel gear .................................................................... 28  
Spark plug .................................................................... 28  
Maintenance schedule ................................................. 29  
TECHNICAL DATA  
Technical data .............................................................. 30  
FEDERAL EMISSION CONTROL WARRANTY  
STATEMENT  
YOUR WARRANTY RIGHTS AND OBLIGATIONS ..... 31  
English – 3  
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INTRODUCTION  
Dear customer!  
Congratulations on your choice to buy a Jonsered product!  
Your purchase gives you access to professional help with repairs and service whenever this may be necessary. If the retailer who  
sells your machine is not one of our authorized dealers, ask for the address of your nearest servicing dealer.  
It is our wish that you will be satisfied with your product and that it will be your companion for a long time. Think of this operators  
manual as a valuable document.By following itscontent (using, service, maintenance etc) the life span and the second-hand value  
of the machine can be extended. If you ever lend or sell this machine, make sure that the borrower or buyer gets the operators  
manual, so they will also know how to properly maintain and use it.  
Good luck on using your Jonsered machine!  
Jonsered has a policy of continuous product development and therefore reserves the right to modify the design and appearance  
of products without prior notice.  
4 – English  
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WHAT IS WHAT?  
23  
24  
What is what on the clearing saw? (RS44)  
1
2
3
4
5
6
7
8
9
Blade  
15 Handle adjustment  
Grease filler cap, bevel gear  
Bevel gear  
16 Harness  
17 Locking nut  
Cutting attachment guard  
Shaft  
18 Support flange  
19 Support cup  
Handlebar  
20 Drive disc  
Throttle control  
Stop switch  
21 Trimmer head  
22 Socket spanner  
23 Operator’s manual  
24 Transport guard  
25 Allen key  
Throttle lockout  
10 Support eyes for harness  
11 Cylinder cover  
12 Starter handle  
13 Fuel tank  
26 Carburettor screwdriver  
27 Locking pin  
14 Choke control  
28 Gearbox grease  
English – 5  
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WHAT IS WHAT?  
What is what on the clearing saw? (RS52)  
1
2
3
4
5
6
7
8
9
Blade  
15 Fuel tank  
Grease filler cap, bevel gear  
Bevel gear  
16 Socket spanner  
17 Handle adjustment  
18 Locking nut  
Cutting attachment guard  
Shaft  
19 Support flange  
20 Drive disc  
Handlebar  
Throttle control  
Stop switch  
21 Transport guard  
22 Harness  
Throttle lockout  
23 Operator’s manual  
24 Allen key  
10 Support eyes for harness  
11 Cylinder cover  
12 Starter handle  
13 Choke control  
14 Air filter  
25 Locking pin  
26 Gearbox grease  
27 Carburettor screwdriver  
6 – English  
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GENERAL SAFETY PRECAUTIONS  
Important  
WARNING! Listen out for warning signals or  
shouts when you are wearing hearing  
protection. Always remove your hearing  
protection as soon as the engine stops.  
!
IMPORTANT!  
The machine is only designed for trimming grass, grass  
clearing and/or forestry clearing.  
HELMET  
A helmet should be worn if the trees being cleared are taller  
than 2 m.  
The only accessories you can operate with this engine unit  
are the cutting attachments we recommend in the chapter  
on Technical data.  
Never use the machine if you are tired, if you have drunk  
alcohol, or if you are taking medication that could affect your  
vision, your judgement or your co-ordination.  
HEARING PROTECTION  
Wear personal protective equipment. See instructions  
under the heading Personal protective equipment.  
Wear hearing protection that provides adequate noise  
reduction.  
Never use a machine that has been modified in any way  
from its original specification.  
Never use a machine that is faulty. Carry out the checks,  
maintenance and service instructions described in this  
manual.Some maintenance and service measures must be  
carried out by trained and qualified specialists. See  
instructions under the heading Maintenance.  
EYE PROTECTION  
Always wear approved eye protection. If you use a visor then  
you must also wear approved protective goggles. Approved  
protective goggles must comply with standard ANSI Z87.1 in  
the USA or EN 166 in EU countries.  
All covers, guards and handles must be fitted before  
starting. Ensure that the spark plug cap and ignition lead  
are undamaged to avoid the risk of electric shock.  
The machine operator must ensure that no people or  
animals come closer than 15 metres while working. When  
several operators are working in the same area the safety  
distance should be at least twice the tree height and no less  
than 15 metres.  
GLOVES  
Gloves should be worn when necessary, e.g., when fitting  
cutting attachments.  
WARNING! The ignition system of this  
machine produces an electromagnetic field  
!
during operation.This field may under some  
circumstances interfere with pacemakers.To  
reduce the risk of serious or fatal injury, we  
recommend persons with pacemakers to  
consult their physician and the pacemaker  
manufacturer before operating this machine.  
BOOTS  
Wear boots with steel toe-caps and non-slip sole.  
WARNING! Running an engine in a confined  
or badly ventilated area can result in death  
due to asphyxiation or carbon monoxide  
poisoning.  
!
Personal protective equipment  
CLOTHING  
Wear clothes made of a strong fabric and avoid loose clothing  
that can catch on twigs and branches. Always wear heavy,  
long pants. Do not wear jewellery, shorts sandals or go  
barefoot. Secure hair so it is above shoulder level.  
IMPORTANT!  
A clearing saw, brushcutter or trimmer can be dangerous if  
used incorrectly or carelessly, and can cause serious or  
fatal injury to the operator or others. It is extremely  
important that you read and understand the contents of this  
operator’s manual.  
FIRST AID KIT  
Always have a first aid kit nearby.  
You must use approved personal protective equipment  
whenever you use the machine. Personal protective  
equipment cannot eliminate the risk of injury but it will  
reduce the degree of injury if an accident does happen. Ask  
your dealer for help in choosing the right equipment.  
English – 7  
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GENERAL SAFETY PRECAUTIONS  
Press the throttle lockout and make sure it returns to its  
original position when you release it.  
Machine s safety equipment  
This section describes the machines safety equipment, its  
purpose, and how checks and maintenance should be carried  
out to ensure that it operates correctly. See the ”What is  
what?” section to locate where this equipment is positioned  
on your machine.  
The life span of the machine can be reduced and the risk of  
accidents can increase if machine maintenance is not carried  
out correctly and if service and/or repairs are not carried out  
professionally. If you need further information please contact  
your nearest servicing dealer.  
Check that the throttle control and throttle lockout move freely  
and that the return springs work properly.  
IMPORTANT!  
All servicing and repair work on the machine requires  
special training. This is especially true of the machines  
safety equipment. If your machine fails any of the checks  
described below you must contact your service agent.  
When you buy any of our products we guarantee the  
availability of professional repairs and service. If the retailer  
who sells your machine is not a servicing dealer, ask him for  
the address of your nearest service agent.  
See instructions under the heading Start. Start the machine  
and apply full throttle. Release the throttle and check that the  
cutting attachment stops and remains at a standstill. If the  
cutting attachment rotates with the throttle in the idle position  
then the carburettor idle setting must be checked. See  
instructions under the heading Maintenance.  
WARNING! Never use a machine with faulty  
safety equipment.The machine’s safety  
equipment must be checked and maintained  
as described in this section. If your machine  
fails any of these checks contact your  
service agent to get it repaired.  
!
Throttle lockout  
The throttle lockout is designed to prevent accidental  
operation of the throttle control. When you press the lock (A)  
(i.e.when you grasp the handle) it releases the throttle control  
(B). When you release the handle the throttle control and the  
throttle lockout both move back to their original positions.This  
movement is controlled by two independent return springs.  
This arrangement means that the throttle control is  
automatically locked at the idle setting.  
Stop switch  
Use the stop switch to switch off the engine.  
B
A
A
B
Start the engine and make sure the engine stops when you  
move the stop switch to the stop setting.  
Make sure the throttle control is locked at the idle setting  
when the throttle lockout is released.  
8 – English  
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GENERAL SAFETY PRECAUTIONS  
Regularly check the vibration damping units for cracks or  
deformation. Check that the vibration damping element is  
undamaged and securely attached.  
Cutting attachment guard  
WARNING! Overexposure to vibration can  
lead to circulatory damage or nerve damage  
in people who have impaired circulation.  
This guard is intended to prevent loose objects from being  
thrown towards the operator. The guard also protects the  
operator from accidental contact with the cutting attachment.  
!
Contact your doctor if you experience  
symptoms of overexposure to vibration.  
Such symptoms include numbness, loss of  
feeling, tingling, pricking, pain, loss of  
strength, changes in skin colour or  
condition.These symptoms normally appear  
in the fingers, hands or wrists.The risk  
increases at low temperatures.  
Check that the guard is undamaged and not cracked.Replace  
the guard if it has been exposed to impact or is cracked.  
Quick release  
There is an easily accessible, quick release fitted at the front  
as a safety precaution in case the engine catches fire, or in  
any other situation that requires you to free yourself from the  
machine and harness. See instructions under the heading  
Adjusting the harness and clearing saw. Certain harnesses  
also have a quick release fitted to the support hook.  
Always use the recommended guard for the cutting  
attachment you are using. See chapter on Technical data.  
WARNING! Never use a cutting attachment  
without an approved guard. See the chapter  
on Technical data. If an incorrect or faulty  
guard is fitted this can cause serious  
personal injury.  
!
Vibration damping system  
Check that the harness straps are correctly positioned. Once  
the harness and machine have been adjusted, check that the  
harness quick release works correctly.  
Your machine is equipped with a vibration damping system  
that is designed to reduce vibration and make operation  
easier.  
Muffler  
The muffler is designed to keep noise levels to a minimum  
and to direct exhaust fumes away from the user. A muffler  
fitted with a catalytic converter is also designed to reduce  
harmful exhaust gases.  
Use of incorrectly wound cord or an incorrect cutting  
attachment increases the level of vibration. See instructions  
under the heading Cutting equipment.  
The machines vibration damping system reduces the transfer  
of vibration between the engine unit/cutting equipment and  
the machines handle unit.  
In countries that have a warm and dry climate there is a  
significant risk of fire. We therefore fit certain mufflers with a  
spark arrestor screen. Check whether the muffler on your  
machine is fitted with this kind of screen.  
English – 9  
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GENERAL SAFETY PRECAUTIONS  
For mufflers it is very important that you follow the instructions  
Locking nut  
on checking, maintaining and servicing your machine. See  
instructions under the heading Checking, maintaining and  
servicing the machine’s safety equipment.  
Never use a machine that has a faulty muffler.  
A locking nut is used to secure some types of cutting  
attachment.  
Regularly check that the muffler is securely attached to the  
machine.  
When fitting, tighten the nut in the opposite direction to the  
direction of rotation of the cutting attachment. To remove it,  
undo the nut in the same direction as the cutting attachment  
rotates. (CAUTION! The nut has a left-hand thread.) When  
loosening and tightening the saw blade nut, there is a risk of  
injury from the teeth of the saw blade.You should therefore  
always ensure that your hand is shielded by the blade guard  
when doing this. Always use a socket spanner with a shaft  
that is long enough to allow this. The arrow in the diagram  
shows the area where you should operate the socket spanner  
when loosening or tightening the nut.  
If the muffler on your machine is fitted with a spark arrestor  
screen this must be cleaned regularly. A blocked screen will  
cause the engine to overheat and may lead to serious  
damage.  
WARNING! Mufflers fitted with catalytic  
converters get very hot during use and  
remain so for some time after stopping.This  
also applies at idle speed. Contact can result  
in burns to the skin. Remember the risk of  
fire!  
!
The nylon lining inside the locking nut must not be so worn  
that you can turn it by hand. The lining should offer a  
resistance of at least 1.5 Nm. The nut should be replaced  
after it has been put on approx. 10 times.  
WARNING! The inside of the muffler contain  
chemicals that may be carcinogenic. Avoid  
contact with these elements in the event of a  
damaged muffler.  
!
Locking screw  
WARNING! Bear in mind that:  
The lock screw must be tightened securely for ball-bearing-  
mounted support cups.  
!
The exhaust fumes from the engine are hot  
and may contain sparks which can start a  
fire. Never start the machine indoors or near  
combustible material!  
10 – English  
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GENERAL SAFETY PRECAUTIONS  
General rules  
Cutting equipment  
This section describes how to choose and maintain your  
cutting equipment in order to:  
Reduce the risk of blade thrust.  
Only use cutting attachments with the guards we  
recommend! See the chapter on Technical data.  
Obtain maximum cutting performance.  
Extend the life of cutting equipment.  
IMPORTANT!  
Only use cutting attachments with the guards we  
recommend! See the chapter on Technical data.  
Keep the teeth of the blade correctly sharpened! Follow our  
instructions and use the recommended file gauge. An  
incorrectly sharpened or damaged blade increases the risk of  
accidents.  
Refer to the instructions for the cutting attachment to check  
the correct way to load the cord and the correct cord  
diameter.  
Keep the teeth of the blade correctly sharpened! Follow our  
recommendations. Also refer to the instructions on the  
blade packaging.  
Maintain the correct blade setting! Follow our instructions  
and use the recommended file gauge.  
Keep the correct setting on the saw blade! Follow our  
instructions and use the recommended setting tool. An  
incorrectly set saw blade increases the risk of jamming and  
blade thrust, and damage to the saw blade.  
WARNING! Always stop the engine before  
doing any work on the cutting attachment.  
This continues to rotate even after the  
throttle has been released. Ensure that the  
cutting attachment has stopped completely  
and disconnect the HT lead from the spark  
plug before you start to work on it.  
!
Check the cutting attachment for damage or cracks. A  
damaged cutting attachment should always be replaced.  
WARNING! Using an incorrect cutting  
attachment or an incorrectly sharpened  
blade increases the risk of blade thrust.  
!
Cutting equipment  
Saw blades are intended for cutting fibrous types of wood.  
Grass blades and grass cutters are intended for cutting  
coarse grass.  
A trimmer head is intended for trimming grass.  
English – 11  
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GENERAL SAFETY PRECAUTIONS  
so, this should be done before filing with a round file. The  
top edges must be filed down by the same amount for all  
the teeth.  
Sharpening grass cutters and grass  
blades  
See the cutting attachment packaging for correct  
sharpening instructions. Sharpen blades and cutters  
using a single-cut flat file.  
Sharpen all edges equally to maintain the balance of the  
blade.  
Adjust the blade setting. This should be 1 mm.  
WARNING! Always discard a blade that is  
bent, twisted, cracked, broken or damaged  
in any other way. Never attempt to straighten  
a twisted blade so that it can be reused. Only  
use original blades of the specified type.  
!
Trimmer head  
IMPORTANT!  
Sharpening the saw blade  
Always ensure the trimmer cord is wound tightly and evenly  
around the drum, otherwise the machine will generate  
harmful vibration.  
Only use the recommended trimmer heads and trimmer  
cords.These have been tested by the manufacturer to suit  
a particular engine size.This is especially important when  
a fully automatic trimmer head is used. Only use the  
recommended cutting attachment. See the chapter on  
Technical data.  
See the cutting attachment packaging for correct  
sharpening instructions.  
A correctly sharpened blade is essential for working efficiently  
and to avoid unnecessary wear to the blade and clearing saw.  
Smaller machines generally require small trimmer heads  
and vice versa. This is because when clearing using a  
cord the engine must throw out the cord radially from the  
trimmer head and overcome the resistance of the grass  
being cleared.  
The length of the cord is also important. A longer cord  
requires greater engine power than a shorter cord of the  
same diameter.  
Make sure that the blade is well supported when you file  
it. Use a 5.5 mm round file with a file holder.  
Make sure that the cutter on the trimmer guard is intact.  
This is used to cut the cord to the correct length.  
To increase the life of the cord it can be soaked in water  
for a couple of days.This will make the line tougher so that  
it lasts longer.  
The filing angle is 15°. File alternate teeth to the right and  
those in between to the left. If the blade has been heavily  
pitted by stones it may be necessary to dress the top  
edges of the teeth with a flat file, in exceptional cases. If  
12 – English  
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ASSEMBLY  
Assembling the handlebar and  
throttle  
Assembling the cutting equipment  
WARNING!  
Unscrew the knob from the handlebar mounting.  
!
When fitting the cutting attachment it is  
extremely important that the raised section  
on the drive disc/support flange engages  
correctly in the centre hole of the cutting  
attachment. If the cutting attachment is fitted  
incorrectly it can result in serious and/or  
fatal personal injury.  
Position the handlebar as shown. Fit the mounting  
components and tighten the knob lightly.  
Fit the right handle to the handlebar using the screw,  
washer, sleeve and nut as shown. Tighten.  
WARNING! Never use a cutting attachment  
without an approved guard. See the chapter  
on Technical data. If an incorrect or faulty  
guard is fitted this can cause serious  
personal injury.  
!
Put on the harness and hang the machine from the  
support hook. Now make a final adjustment so that the  
machine is in a comfortable working position when it  
hangs from the harness. Tighten the knob.  
IMPORTANT! If a saw blade or grass blade are to be used  
the machine must be equipped with the correct handlebar,  
blade guard and harness.  
Fitting a blade guard, grass blade  
and grass cutter  
The blade guard (A) is fitted using 4 screws (L) and the  
support plate (M) as shown.  
Transport position, handlebar  
CAUTION! Always use the recommended guard for the  
cutting attachment you are using. See chapter on  
Technical data.  
The handlebar can easily be turned to fit along the shaft  
for easier transportation and storage.  
Fit the drive disc (B) on the output shaft.  
Loosen the knob.Turn the handlebar clockwise so that the  
throttle handle rests against the engine.  
Turn the blade shaft until one of the holes in the drive disc  
aligns with the corresponding hole in the gear housing.  
Now twist the handlebar around the shaft. Tighten the  
knob.  
Insert the locking pin (C) in the hole to lock the shaft.  
Place the blade (D) on the output shaft.  
N
E
F
Fit the transport guard to the cutting attachment.  
D
M
B
L
C
A
English – 13  
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ASSEMBLY  
Fit the support flange (F) on the output shaft. Make sure  
that the blade is centered by fitting it to the guide on the  
support flange.  
guard as possible. To tighten the nut, turn the spanner in  
the opposite direction to the direction of rotation (Caution!  
left-hand thread).  
G
F
Screw the support cup (E) onto the output shaft threads  
(CAUTION! Left-hand thread). Tighten to a torque of 35-  
50 Nm (3.5-5.0 kpm). Use the socket spanner in the tool  
kit. Note that the locking pin (C) must remain inside the  
gear housing to lock the drive disk. Hold the shaft of the  
socket spanner as close to the blade guard/combination  
guard as possible.  
D
B
C
When loosening and tightening the saw blade nut, there is a  
risk of injury from the teeth of the saw blade.You should  
therefore always ensure that your hand is shielded by the  
blade guard when doing this. Always use a socket spanner  
with a shaft that is long enough to allow this.The arrow in the  
diagram shows the area where you should operate the socket  
spanner when loosening or tightening the nut.  
WARNING! Tighten the lock screw (N) in the  
center hole of the support cup.Tighten to a  
torque of 35-50 Nm (3.5-5.0 kpm), CAUTION!  
!
Left-hand thread. If the lock screw is not  
fitted in the support cup, there is a risk that  
the support cup will come unscrewed.This  
means that the blade will also come loose,  
which could result in serious or fatal injury  
to the operator or others.  
Fitting the trimmer guard and  
trimmer head Trimmy SII  
Fitting the blade guard and saw  
blade  
The blade guard (A) is fitted using 4 screws (L) as shown.  
CAUTION! If the machine is to be used with a trimmer  
head, the fast idle speed must be reduced by 400-500 rpm.  
See instructions under the heading Carburettor.  
CAUTION! Always use the recommended guard for the  
cutting attachment you are using. See chapter on  
Technical data.  
Fit the correct trimmer guard (A) for use with the trimmer  
head. Secure the trimmer guard using the 4 screws (L)  
and the support plate (M) as shown.  
L
Fit the drive disc (B) on the output shaft.  
Turn the blade shaft until one of the holes in the drive disc  
aligns with the corresponding hole in the gear housing.  
Insert the locking pin (C) in the hole to lock the shaft.  
A
A
L
B
Fit the drive disc (B) on the output shaft.  
Turn the blade shaft until one of the holes in the drive disc  
aligns with the corresponding hole in the gear housing.  
Insert the locking pin (C) in the hole to lock the shaft.  
C
Place the blade (D) and support flange (F) on the output  
shaft.  
M
Screw on the trimmer head (H) in the opposite direction to  
the direction of rotation.  
Fit the nut (G). The nut must be tightened to a torque of  
35-50 Nm (3.5-5 kpm). Use the socket spanner in the tool  
kit. Hold the shaft of the spanner as close to the blade  
14 – English  
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ASSEMBLY  
Tighten the trimmer head to a torque of 35-50 Nm (3.5-5  
kpm).  
Standard harness  
H
Safety release  
At the front is an easily accessible, quick release. Use this if  
the engine catches fire or in any other emergency situation  
that requires you to free yourself from the machine and  
harness.  
To dismantle, follow the instructions in the reverse order.  
Fitting other guards and cutting  
attachments  
Spreading the load on your shoulders  
A well-adjusted harness and machine makes work much  
easier. Adjust the harness for the best working position.  
Tension the side straps so that the weight is evenly distributed  
across both shoulders.  
Fit the trimmer guard/combination guard (A) intended for use  
with the trimmer head/plastic blades. Secure the trimmer  
guard using the 4 screws (L) and the support plate (M) as  
shown.  
Fit the drive disc (B) on the output shaft.  
Turn the blade shaft until one of the holes in the drive disc  
aligns with the corresponding hole in the gear housing.  
Insert the locking pin (C) in the hole to lock the shaft.  
A
L
B
Correct height  
1
Forestry clearing  
The machine should be supported in a harness when  
forestry clearing so that the cutting equipment is angled  
slightly forwards in relation to the ground. Adjust the  
height using the strap on the harness for the support  
hook.  
C
M
Screw on the trimmer head/plastic blades (H) in the  
opposite direction to the direction of rotation.  
H
H
To dismantle, follow the instructions in the reverse order.  
2
Grass clearing  
Adjusting the harness and clearing  
saw  
The machine should be supported in a harness when  
grass clearing so that the cutting equipment is parallel to  
the ground.  
WARNING! When using a clearing saw it  
must always be hooked securely to the  
harness. Otherwise you will be unable to  
control the clearing saw safely and this can  
result in injury to yourself or others. Never  
use a harness with a defective quick release.  
!
English – 15  
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ASSEMBLY  
6
The elastic strap (B) can be tightened to transfer more  
load from the shoulder straps to the hip strap.  
Vector harness  
Safety release  
Push down the red release lever to release the machine from  
the harness.  
Correct balance  
1
Forestry clearing  
The machine is balanced by moving the suspension ring  
on the machine forwards or backwards. On some models  
the suspension ring is fixed, however, this will then have a  
number of holes for the support hook. The machine is  
correctly balanced when it freely hangs horizontally from  
the support hook. In this way the risk of hitting stones is  
reduced if you need to release the handlebar.  
Adjusting the harness  
1
Tighten the hip strap so that it sits securely.  
2
Tighten the chest strap under your left arm so that it fits  
closely around your body.  
2
Grass clearing  
Let the blade balance at a comfortable cutting height, i.e.  
close to the ground.  
3
Adjust the shoulder strap to distribute the load evenly  
across your shoulders. Press downwards on the  
suspension hook to load the harness.  
4
Adjust the height of the suspension hook as described in  
the instructions for the standard harness. (Forestry  
clearing)  
5
If you need to lower the suspension hook, for trimming for  
example, move the suspension strap (A) to the lower  
mounting point on the backplate.  
16 – English  
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FUEL HANDLING  
Gasoline  
Fuel safety  
Never start the machine:  
1
2
If you have spilled fuel on it.Wipe off the spillage and allow  
remaining fuel to evaporate.  
CAUTION! Always use a quality gasoline/oil mixture with an  
octane rating of at least 87 octane ((RON+MON)/2). If your  
machine is equipped with a catalytic converter (see chapter  
on Technical data) always use a good quality unleaded  
gasoline/oil mixture.Leaded gasoline will destroy the catalytic  
converter.  
If you have spilled fuel on yourself or your clothes, change  
your clothes.Wash any part of your body that has come in  
contact with fuel. Use soap and water.  
3
If the machine is leaking fuel. Check regularly for leaks  
from the fuel cap and fuel lines.  
Use low-emission gasoline, also known as alkylate gasoline,  
if it is available.  
Transport and storage  
Store and transport the machine and fuel so that there is  
no risk of any leakage or fumes coming into contact with  
sparks or naked flames, for example, from electrical  
machinery, electric motors, electrical relays/switches or  
boilers.  
When storing and transporting fuel always use approved  
containers intended for this purpose.  
This engine is certified to operate on unleaded gasoline.  
The lowest recommended octane grade is 87  
When storing the machine for long periods the fuel tank  
must be emptied.Contact your local gas station to find out  
where to dispose of excess fuel.  
((RON+MON)/2). If you run the engine on a lower octane  
grade than 87 so-called knocking can occur. This gives  
rise to a high engine temperature and increased bearing  
load, which can result in serious engine damage.  
Ensure the machine is cleaned and that a complete  
service is carried out before long-term storage.  
When working at continuous high revs a higher octane  
rating is recommended.  
The transport guard must always be fitted to the cutting  
attachment when the machine is being transported or in  
storage.  
Two-stroke oil  
For best results and performance use JONSERED two-  
stroke engine oil, which is specially formulated for our air-  
cooled two stroke-engines.  
WARNING! Take care when handling fuel.  
Bear in mind the risk of fire, explosion and  
inhaling fumes.  
!
Never use two-stroke oil intended for water-cooled  
engines, sometimes referred to as outboard oil (rated  
TCW).  
Fuel  
Never use oil intended for four-stroke engines.  
Mixing ratio  
CAUTION!The machine is equipped with a two-stroke engine  
and must always been run using a mixture of gasoline and  
two-stroke engine oil. It is important to accurately measure  
the amount of oil to be mixed to ensure that the correct  
mixture is obtained.When mixing small amounts of fuel, even  
small inaccuracies can drastically affect the ratio of the  
mixture.  
1:50 (2%) with JONSERED two-stroke oil.  
Two-stroke oil, litre  
Gasoline, litre  
2% (1:50)  
5
0,10  
10  
0,43/0,20  
0,30  
WARNING! Fuel and fuel fumes are highly  
inflammable and can cause serious injury  
15  
!
when inhaled or allowed to come in contact  
20  
0,40  
with the skin. For this reason observe  
caution when handling fuel and make sure  
there is adequate ventilation.  
US gallon  
US fl. oz.  
2 1/2  
1
2 1/2  
5
6 1/2  
12 7/8  
English – 17  
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FUEL HANDLING  
Mixing  
Fueling  
Always mix the gasoline and oil in a clean container  
intended for fuel.  
Always start by filling half the amount of the gasoline to be  
used. Then add the entire amount of oil. Mix (shake) the  
fuel mixture. Add the remaining amount of gasoline.  
WARNING!Taking the following precautions,  
will lessen the risk of fire:  
Mix (shake) the fuel mixture thoroughly before filling the  
machine’s fuel tank.  
!
Do not smoke or place hot objects near fuel.  
Always shut off the engine before refuelling.  
Always stop the engine and let it cool for a  
few minutes before refuelling.  
When refuelling, open the fuel cap slowly so  
that any excess pressure is released gently.  
Tighten the fuel cap carefully after refuelling.  
Always move the machine away from the  
refuelling area before starting.  
Do not mix more than one month’s supply of fuel at a time.  
Clean the area around the fuel cap. Contamination in the  
tank can cause operating problems.  
If the machine is not used for some time the fuel tank  
should be emptied and cleaned.  
Ensure that the fuel is well mixed by shaking the container  
before filling the tank.  
WARNING! The catalytic converter muffler  
gets very hot during and after use.This also  
applies during idling. Be aware of the fire  
hazard, especially when working near  
flammable substances and/or vapours.  
!
18 – English  
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STARTING AND STOPPING  
Check before starting  
Starting and stopping  
Check the blade to ensure that no cracks have formed at  
the bottom of the teeth or by the centre hole. The most  
common reason why cracks are formed is that sharp  
corners have been formed at the bottom of the teeth while  
sharpening or that the blade has been used with dull  
teeth. Discard a blade if cracks are found.  
WARNING! The complete clutch cover and  
shaft must be fitted before the machine is  
started, otherwise the clutch can come loose  
and cause personal injury.  
!
Always move the machine away from the  
refuelling area before starting. Place the  
machine on a flat surface. Ensure the cutting  
attachment cannot come into contact with  
any object.  
Make sure no unauthorised persons are in  
the working area, otherwise there is a risk of  
serious personal injury.The safety distance  
is 15 metres.  
Check that the support flange is not cracked due to fatigue  
or due to being tightened too much. Discard the support  
flange if it is cracked.  
Cold engine  
Ignition:  
Set the stop switch to the start position.  
Choke:  
Ensure the locking nut has not lost its captive force. The  
nut lock should have a locking force of at least 1.5 Nm.  
The tightening torque of the locking nut should be 35-50  
Nm.  
Set the choke control in the choke position.  
Check that the blade guard is not damaged or cracked.  
Replace the blade guard if it is exposed to impact or is  
cracked.  
Warm engine  
Use the same starting procedure as for a cold engine but  
without setting the choke control in the choke position.  
Set the throttle to the start position by moving the choke  
control to the choke position and then returning it to its original  
position.  
Check that the trimmer head and trimmer guard are not  
damaged or cracked. Replace the trimmer head or  
trimmer guard if they have been exposed to impact or are  
cracked.  
Never use the machine without a guard nor with a  
defective guard.  
English – 19  
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STARTING AND STOPPING  
Starting  
WARNING! When the engine is started with  
the choke in either the choke or start throttle  
positions the cutting attachment will start to  
rotate immediately.  
!
Hold the body of the machine on the ground using your left  
hand (CAUTION! Not with your foot!). Grip the starter handle,  
slowly pull out the cord with your right hand until you feel  
some resistance (the starter pawls grip), now quickly and  
powerfully pull the cord.Never wrap the starter cord around  
your hand  
Repeat pulling the cord until the engine starts. When the  
engine starts. return choke control to run position and apply  
full throttle; the throttle will automatically disengage from the  
start setting.  
CAUTION! Do not pull the starter cord all the way out and do  
not let go of the starter handle when the cord is fully extended.  
This can damage the machine.  
Stopping  
Stop the engine by switching off the ignition.  
20 – English  
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WORKING TECHNIQUES  
6
7
Keep a good balance and a firm foothold.  
General working instructions  
Always hold the machine with both hands. Hold the  
machine on the right side of your body.  
IMPORTANT!  
This section describes the basic safety precautions for  
working with clearing saws and trimmers.  
If you encounter a situation where you are uncertain how to  
proceed you should ask an expert. Contact your dealer or  
your service workshop.  
Avoid all usage which you consider to be beyond your  
capability.  
You must understand the difference between forestry  
clearing, grass clearing and grass trimming before use.  
8
9
Keep the cutting attachment below waist level.  
Basic safety rules  
Switch off the engine before moving to another area. Fit  
the transport guard before carrying or transporting the  
equipment any distance.  
10 Never put the machine down with the engine running  
unless you have it in clear sight.  
1
Look around you:  
To ensure that people, animals or other things cannot  
affect your control of the machine.  
The ABC of clearing  
To ensure that people, animals, etc., do not come into  
contact with the cutting attachment or loose objects that  
are thrown out by the cutting attachment.  
Always use the correct equipment.  
Make sure the equipment is well adjusted.  
Follow the safety precautions.  
CAUTION! Do not use the machine unless you are able to  
call for help in the event of an accident.  
Organise your work carefully.  
2
Inspect the working area. Remove all loose objects, such  
as stones, broken glass, nails, steel wire, string, etc. that  
could be thrown out or become wrapped around the  
cutting attachment.  
Always use full throttle when starting to cut with the blade.  
Always use sharp blades.  
Avoid stones.  
3
4
Do not use the machine in bad weather, such as dense  
fog, heavy rain, strong wind, intense cold, etc. Working in  
bad weather is tiring and often brings added risks, such as  
icy ground, unpredictable felling direction, etc.  
Control the felling direction (take advantage of the wind).  
WARNING! Neither the operator of the  
machine nor anyone else may attempt to  
remove the cut material while the engine is  
running or the cutting equipment is rotating,  
as this can result in serious injury.  
Make sure you can move and stand safely.Check the area  
around you for possible obstacles (roots, rocks, branches,  
ditches, etc.) in case you have to move suddenly. Take  
great care when working on sloping ground.  
!
Stop the engine and cutting equipment  
before you remove material that has wound  
around the blade shaft as otherwise there is  
a risk of injury.The bevel gear can get hot  
during use and may remain so for a while  
afterwards.You could get burnt if you touch  
it.  
WARNING! Watch out for thrown objects.  
Always wear approved eye protection. Never  
lean over the cutting attachment guard.  
Stones, rubbish, etc. can be thrown up into  
the eyes causing blindness or serious injury.  
5
Take great care when cutting a tree that is under tension.  
A tree that is under tension may spring back to its normal  
position before or after being cut. If you position yourself  
incorrectly or make the cut in the wrong place the tree may  
hit you or the machine and cause you to lose control. Both  
situations can cause serious personal injury.  
!
Keep unauthorised persons at a distance.  
Children, animals, onlookers and helpers  
should be kept outside the safety zone of 15  
m. Stop the machine immediately if anyone  
approaches. Never swing the machine  
around without first checking behind you to  
make sure no-one is within the safety zone.  
English – 21  
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WORKING TECHNIQUES  
You should plan the strip so that you avoid going over  
WARNING! Sometimes branches or grass  
get caught between the guard and cutting  
attachment. Always stop the engine before  
cleaning.  
ditches or other obstacles on the ground.You should also  
orient the strip to take advantage of wind conditions, so  
that cleared stems fall in the cleared area of the stand.  
!
Working methods  
WARNING! Machines fitted with saw blades  
or grass blades can be thrown violently to  
the side when the blade comes into contact  
with a fixed object.This is called blade  
thrust. A blade thrust can be violent enough  
to cause the machine and/or operator to be  
propelled in any direction, and possibly lose  
control of the machine. Blade thrust can  
occur without warning if the machine snags,  
stalls or binds. Blade thrust is more likely to  
occur in areas where it is difficult to see the  
material being cut.  
!
Forestry clearing using a saw blade  
The risk of blade thrust increases with increasing stem  
size.You should therefore avoid cutting with the area of  
the blade between 12 o’clock and 3 o’clock.  
Avoid cutting with the area of the blade  
between the 12 o’clock and 3 o’clock  
positions. Because of the speed of rotation  
of the blade, blade thrust can occur if you  
attempt to cut thick stems with this area of  
the blade.  
Before you start clearing, check the clearing area, the  
type of terrain, the slope of the ground, whether there are  
stones, hollows etc.  
To fell to the left, the bottom of the tree should be pushed  
to the right. Tilt the blade and bring it diagonally down to  
the right, exerting firm pressure. At the same time push  
the stem using the blade guard. Cut with the area of the  
blade between 3 o’clock and 5 o’clock. Apply full throttle  
before advancing the blade.  
Start at whichever end of the area is easiest, and clear an  
open space from which to work.  
Work systematically to and fro across the area, clearing a  
width of around 4-5 m on each pass. This exploits the full  
reach of the machine in both directions and gives the  
operator a convenient and varied working area to work in.  
To fell to the right, the bottom of the tree should be pushed  
to the left. Tilt the blade and bring it diagonally up to the  
right. Cut with the area of the blade between 3 o’clock and  
5 o’clock so that the direction of rotation of the blade  
pushes the bottom of the tree to the left.  
Clear a strip around 75 m long. Move your fuel can as  
work progresses.  
On sloping ground you should work along the slope. It is  
much easier to work along a slope than it is to work up and  
down it.  
22 – English  
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WORKING TECHNIQUES  
To fell a tree forwards, the bottom of the tree should be  
pulled backwards. Pull the blade backwards with a quick,  
firm movement.  
and cut from the centre of the group. If it is still difficult to  
gain access, cut the stems high up and let them fall. This  
will reduce the risk of jamming.  
Large stems must be cut from two sides. First determine  
which direction the stem will fall. Make the first cut on the  
felling side. Then finish cutting the stem from the other  
side. Adjust the cutting pressure to match the size of the  
stem and the hardness of the wood. Small stems require  
more pressure, while large stems require less pressure.  
Grass clearing using a grass blade  
Grass blades and grass cutters must not be used on  
woody stems.  
A grass blade is used for all types of tall or coarse grass.  
The grass is cut down with a sideways, swinging  
movement, where the movement from right-to-left is the  
clearing stroke and the movement from left-to-right is the  
return stroke. Let the left-hand side of the blade (between  
8 and 12 o’clock) do the cutting.  
If the stems are tightly packed, adapt your walking pace to  
suit.  
If the blade jams in a stem, never jerk the machine free. If  
you do this the blade, bevel gear, shaft or handlebar may  
be damaged. Release the handles, grip the shaft with  
both hands and gently pull the machine free.  
If the blade is angled to the left when clearing grass, the  
grass will collect in a line, which makes it easier to collect,  
e.g. by raking.  
Try to work rhythmically. Stand firmly with your feet apart.  
Move forward after the return stroke and stand firmly  
again.  
Brush cutting with a saw blade  
Let the support cup rest lightly against the ground. It is  
used to protect the blade from hitting the ground.  
Thin stems and brush are mown down. Work with a  
sawing movement, swinging sideways.  
Reduce the risk of material wrapping around the blade by  
following these instructions:  
Try to cut several stems in a single sawing movement.  
1
2
Always work at full throttle.  
With groups of hardwood stems, first clear around the  
group. Start by cutting the stems high up around the  
outside of the group to avoid jamming.Then cut the stems  
to the required height. Now try to reach in with the blade  
Avoid the previously cut material during the return  
stroke.  
Stop the engine, unclip the harness and place the  
machine on the ground before you start to collect the cut  
material.  
English – 23  
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WORKING TECHNIQUES  
Sweeping  
Grass trimming with a trimmer head  
The fan effect of the rotating cord can be used for quick  
and easy clearing up. Hold the cord parallel to and above  
the area to be swept and move the tool to and fro.  
Trimming  
Hold the trimmer head just above the ground at an angle.  
It is the end of the cord that does the work. Let the cord  
work at its own pace. Never press the cord into the area  
to be cut.  
When cutting and sweeping you should use full throttle to  
obtain the best results.  
The cord can easily remove grass and weeds up against  
walls, fences, trees and borders, however it can also  
damage sensitive bark on trees and bushes, and damage  
fence posts.  
Reduce the risk of damaging plants by shortening the  
cord to 10-12 cm and reducing the engine speed.  
Clearing  
The clearing technique removes all unwanted vegetation.  
Keep the trimmer head just above the ground and tilt it.Let  
the end of the cord strike the ground around trees, posts,  
statues and the like. CAUTION! This technique increases  
the wear on the cord.  
The cord wears quicker and must be fed forward more  
often when working against stones, brick, concrete, metal  
fences, etc., than when coming into contact with trees and  
wooden fences.  
When trimming and clearing you should use less than full  
throttle so that the cord lasts longer and to reduce the  
wear on the trimmer head.  
Cutting  
The trimmer is ideal for cutting grass that is difficult to  
reach using a normal lawn mower. Keep the cord parallel  
to the ground when cutting. Avoid pressing the trimmer  
head against the ground as this can ruin the lawn and  
damage the tool.  
Do not allow the trimmer head to constantly come into  
contact with the ground during normal cutting. Constant  
contact of this type can cause damage and wear to the  
trimmer head.  
24 – English  
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MAINTENANCE  
The T-screw regulates the throttle setting at idle speed. If  
the T-screw is turned clockwise this gives a higher idle  
speed; turning it anti-clockwise gives a lower idle speed.  
Carburetor  
Your Jonsered product has been designed and manufactured  
to specifications that reduce harmful exhaust fumes. The  
engine will be run in after it has used 8-10 tanks of fuel. To  
ensure that the engine runs at peak performance and  
produces as little harmful exhaust fumes as possible after the  
running-in period, ask your dealer/service workshop (which  
has a rev counter for this purpose) to adjust your carburettor.  
Basic setting  
The basic carburetor settings are adjusted during testing  
at the factory. The basic setting is richer than the optimal  
setting and should be maintained for the first few hours the  
machine is in use. The carburettor should then be finely  
adjusted. Fine adjustment should be carried out by a  
skilled technician.  
WARNING! The complete clutch cover and  
shaft must be fitted before the machine is  
started, otherwise the clutch can come loose  
and cause personal injury.  
!
The basic setting can vary between: H = 1 - 1 1/4 turns  
and L = 1 - 1 1/4 turns.  
CAUTION! If the cutting attachment rotates when the engine  
is idling the idle adjustment screw T should be turned anti-  
clockwise until the cutting attachment stops.  
Carburetor adjustment  
The carburettor can be designed in different ways, depending  
on the existing environmental and emissions legislation.  
Some machines are equipped with movement limiters on the  
carburettor’s adjuster screws. These limit the adjustment  
range to a maximum of 1/2 turn.  
Rec. idle speed 2700 rpm  
WARNING! If the idle speed cannot be  
adjusted so that the cutting attachment  
stops, contact your dealer/service  
workshop. Do not use the machine until it  
has been correctly adjusted or repaired.  
!
H
L
1/2  
1/2  
CAUTION! The machine should only be run for short periods  
at its highest speed. For optimum adjustment of the  
carburettor, contact a qualified dealer/service workshop that  
has a revolution counter at their disposal.  
Function  
Recommended max. speed: See theTechnical data section.  
During the running-in period (8-10 tanks of fuel) the maximum  
speed should be set 600-700 rpm below the recommended  
maximum speed (= open the high speed jet H a further 1/8  
turn).  
The carburetor governs the engine’s speed via the throttle  
control. Air and fuel are mixed in the carburetor. The air/  
fuel mixture is adjustable. Correct adjustment is essential  
to get the best performance from the machine.  
Conditions  
Before any adjustments are made, make sure that the air  
filter is clean and the air filter cover is fitted. If you adjust  
the carburettor when the air filter is dirty it will result in a  
leaner mixture when the filter is finally cleaned. This can  
lead to serious engine damage.  
The setting of the carburetor means that the engine is  
adapted to local conditions, for example, the climate,  
altitude, fuel and the type of 2-stroke oil.  
The carburetor has three adjustment controls:  
L = Low speed jet  
Carefully turn both jets, L and H, so that they are midway  
between fully screwed in and fully screwed out.  
H = High speed jet  
Do not attempt to adjust the L and H jets beyond either  
stop as this could cause damage.  
T = Idle adjustment screw  
RS44  
RS52  
Now start the machine according to the starting  
instructions and let it warm up for 10 minutes.  
CAUTION! If the cutting attachment rotates when the engine  
is idling the idle adjustment screw T should be turned anti-  
clockwise until the cutting attachment stops.  
The L and H-jets are used to adjust the supply of fuel to  
match the rate that air is admitted, which is controlled with  
the throttle. If they are screwed clockwise the air/fuel ratio  
becomes leaner (less fuel) and if they are turned anti-  
clockwise the ratio becomes richer (more fuel). A lean  
mixture gives a higher engine speed and a rich mixture  
gives a lower engine speed.  
English – 25  
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MAINTENANCE  
Low speed jet L  
High speed jet H (RS52)  
Try to find the highest idling speed, turning the low speed  
needle L clockwise respectively counter-clockwise.When the  
highest speed has been found, turn the low speed needle L 1/  
4 turn counter-clockwise.  
The high speed jet H affects the engine power, speed,  
temperature and fuel consumption. If the high speed jet H is  
set too lean (screwed in too far) the engine speed will be too  
high and cause engine damage. Do not let the engine run at  
full speed for more than 10 seconds.  
+ 1/4  
Setting procedure without a load (Blade can be  
used)  
The machine is equipped with speed control in the ignition  
system. It is extremely important to be aware of this when  
adjusting the carburettor.  
L
RS52: Speed control at: 13500 rpm  
Fine adjustment of the idle speedT  
When attempting to adjust the speed over that specified, the  
speed is not changed, but only causes the engine to receive  
too little fuel resulting in a large risk of engine failure.  
Adjust the idle speed using the idle adjustment screw T, if it is  
necessary to readjust. First turn the idle adjustment screw T  
clockwise until the cutting attachment starts to rotate. Then  
turn the screw anticlockwise until the cutting attachment  
stops. The idle speed is correctly adjusted when the engine  
will run smoothly in every position.The idle speed should also  
be well below the speed at which the cutting attachment starts  
to rotate.  
Run the machine warm for approximately 5 minutes  
alternating between short intervals of full throttle and idling.  
When the carburettor is to be adjusted, apply full throttle and  
turn the H-needle anti-clockwise until the engine speed  
reaches 10,500-11,000 r/min (burbles) or until the cap  
reaches its stop position. Now turn the H-needle slowly  
clockwise until the engine reaches the speed when the speed  
control comes into force. In some cases, speed control can  
come into force at 200-300 revs below or above that specified.  
It is important that you do not continue to turn the H-needle  
clockwise when the engine speed has stabilised. Screw the  
H-needle (anti-clockwise) a few tenths of a turn instead.  
WARNING! If the idle speed cannot be  
adjusted so that the cutting attachment  
stops, contact your dealer/service  
workshop. Do not use the machine until it  
has been correctly adjusted or repaired.  
!
High speed jet H (GR41, GR50, RS44)  
The high speed jet H affects the engine power, speed,  
temperature and fuel consumption. If the high speed jet H is  
set too lean (screwed in too far) the engine speed will be too  
high and cause engine damage. Do not let the engine run at  
full speed for more than 10 seconds.  
H
Setting procedure with a load (Trimmer head  
should be used)  
Apply full throttle and turn the high speed jet H very slowly  
clockwise until the engine slows down. Then turn the high  
speed jet H very slowly anticlockwise until the engine starts to  
run unevenly. Now turn the high speed jet H slowly clockwise  
a little way until the engine runs smoothly.  
Ensure the length of the trimmer cord is correct, i.e. exactly  
reaches the knife on the trimmer guard. Use either 3 mm or  
3.3 mm diameter trimmer cord.  
Run the machine warm for about 5 minutes mostly at full  
throttle. When the carburettor is to be adjusted, apply full  
throttle and turn the H-needle anti-clockwise until the engine  
burbles or until the cap reaches its stop position.(If the engine  
runs smoothly when the cap is in its stop position no further  
adjustment is necessary!)Turn the H-needle slowly clockwise  
until the engine runs absolutely smoothly. (Burbling has  
stopped completely). Now screw the H-needle (anti-  
clockwise) a few tenths of a turn.  
H
Note that the engine should not be under load when you  
adjust the high speed jet H.You should therefore remove the  
cutting attachment, nut, support flange and drive disc before  
adjusting the high speed jet H.  
The high speed jet H is adjusted correctly when the machine  
burbles a little. If the machine races then the setting is too  
lean. If the engine produces a lot of smoke and burbles a lot  
then the setting is too rich.  
H
CAUTION! For optimum adjustment of the carburettor,  
contact a qualified dealer/service workshop that has a  
revolution counter at their disposal.  
CAUTION! For optimum adjustment of the carburettor,  
contact a qualified dealer/service workshop that has a  
revolution counter at their disposal.  
26 – English  
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MAINTENANCE  
Correctly adjusted carburetor  
Cooling system  
When the carburetor is correctly adjusted the machine will  
accelerate without hesitation and burble a little at maximum  
speed. It is also important that the cutting attachment does  
not rotate at idle. If the low speed jet L is set too lean it may  
cause starting difficulties and poor acceleration. If the high  
speed jet H is set too lean it will result in less power, less  
performance, poor acceleration and/or damage to the engine.  
If both the L and H jets are set too rich it will results in  
acceleration problems or too low a working speed.  
To keep the working temperature as low as possible the  
machine is equipped with a cooling system.  
Muffler  
CAUTION! Some mufflers are fitted with a catalytic  
converter. See chapter on Technical data to see whether your  
machine is fitted with a catalytic converter.  
The cooling system consists of:  
1
2
3
4
Air intake on the starter.  
Fins on the flywheel.  
The muffler is designed to reduce the noise level and to direct  
the exhaust gases away from the operator. The exhaust  
gases are hot and can contain sparks, which may cause fire  
if directed against dry and combustible material. Some  
mufflers are equipped with a special spark arrestor screen. If  
your machine has this type of muffler, you should clean the  
screen at least once a week. This is best done with a wire  
brush. On mufflers without a catalytic converter the screen  
should be cleaned weekly, or replaced if necessary. On  
mufflers fitted with a catalytic converter the screen should be  
checked, and if necessary cleaned, monthly. If the screen is  
damaged it should be replaced.  
Cooling fins on the cylinder.  
Cylinder cover (directs cold air over the cylinder).  
Clean the cooling system with a brush once a week, more  
often in demanding conditions. A dirty or blocked cooling  
system results in the machine overheating which causes  
damage to the piston and cylinder.  
Air filter  
If the screen is frequently blocked, this can be a sign that the  
performance of the catalytic converter is impaired. Contact  
your dealer to inspect the muffler. A blocked screen will cause  
the machine to overheat and result in damage to the cylinder  
and piston.  
The air filter must be regularly cleaned to remove dust and dirt  
in order to avoid:  
Carburettor malfunctions  
Starting problems  
RS44  
RS52  
Loss of engine power  
Unnecessary wear to engine parts  
Excessive fuel consumption.  
Clean the filter every 25 hours, or more regularly if conditions  
are exceptionally dusty.  
Cleaning the air filter  
Remove the air filter cover and take out the filter. Wash it  
clean in warm, soapy water. Ensure that the filter is dry before  
refitting it.  
CAUTION! Never use a machine with a defective muffler.  
An air filter that has been in use for a long time cannot be  
cleaned completely.The filter must therefore be replaced with  
a new one at regular intervals. A damaged air filter must  
always be replaced.  
WARNING! Mufflers fitted with catalytic  
converters get very hot during use and  
remain so for some time after stopping.This  
also applies at idle speed. Contact can result  
in burns to the skin. Remember the risk of  
fire!  
!
English – 27  
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MAINTENANCE  
Bevel gear  
The bevel gear is filled with the right amount of grease at the  
factory. However, before using the machine you should check  
that the bevel gear is filled 3/4 full with grease. Use  
JONSERED special grease.  
The grease in the bevel gear does not normally need to be  
changed except if repairs are carried out.  
Spark plug  
The spark plug condition is influenced by:  
Incorrect carburetor adjustment.  
An incorrect fuel mixture (too much or incorrect type of  
oil).  
A dirty air filter.  
These factors cause deposits on the spark plug electrodes,  
which may result in operating problems and starting  
difficulties.  
If the machine is low on power, difficult to start or runs poorly  
at idle speed: always check the spark plug first before taking  
any further action. If the spark plug is dirty, clean it and check  
that the electrode gap is 0.5 mm (0,020"). The spark plug  
should be replaced after about a month in operation or earlier  
if necessary.  
CAUTION! Always use the recommended spark plug type!  
Use of the wrong spark plug can damage the piston/cylinder.  
Check that the spark plug is fitted with a suppressor.  
IMPORTANT! Use only JONSERED replacement parts.  
Use of other brands of replacement parts can cause  
damage to your unit or injury to the operator or others.Your  
warranty does not cover damage or liability caused by the  
use of accessories and/or attachments not specifically  
recommended by JONSERED.  
28 – English  
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MAINTENANCE  
Maintenance schedule  
The following is a list of the maintenance that must be performed on the machine. Most of the items are described in the  
Maintenance section. The user must only carry out the maintenance and service work described in this manual. More extensive  
work must be carried out by an authorised service workshop.  
Daily  
maintenance  
Weekly  
maintenance  
Monthly  
maintenance  
Maintenance  
Clean the outside of the machine.  
X
X
Check that the harness is not damaged.  
Make sure the throttle trigger lock and the throttle function correctly from a  
safety point of view.  
X
X
Check that the handle and handlebar are undamaged and secured  
correctly.  
Check that the stop switch works correctly.  
Check that the cutting attachment does not rotate at idle.  
Clean the air filter. Replace if necessary.  
X
X
X
Check that the guard is undamaged and not cracked. Replace the guard if  
it has been exposed to impact or is cracked.  
X
Check that the blade is correctly centred, is sharp, and is not cracked. An  
off-centre blade will cause vibration that could result in damage to the  
machine.  
X
Check that the trimmer head is undamaged and not cracked. Replace the  
trimmer head if necessary.  
X
X
X
Check that the locking nut of the cutting equipment is tighten correctly.  
Check that the locking screw is tightened when using a support cup with  
bearings.  
Check that the transport guard for the blade is intact and that it can be  
secured correctly.  
X
Check that nuts and screws are tight.  
X
X
Check that there are no fuel leaks from the engine, tank or fuel lines.  
Check the starter and starter cord.  
X
X
Check that the vibration damping elements are not damaged.  
Clean the outside of the spark plug. Remove it and check the electrode  
gap. Adjust the gap to 0.5 mm (.20”), or replace the spark plug. Check that  
the spark plug is fitted with a suppressor.  
X
Clean the machines cooling system.  
X
X
X
X
Clean or replace the spark arrestor screen on the muffler (only applies to  
mufflers without a catalytic converter).  
Clean the outside of the carburettor and the space around it.  
Check that the bevel gear is filled three-quarters full with lubricant. Fill if  
necessary using special grease.  
Check the fuel filter from contamination and the fuel hose from cracks or  
other defects. Replace if necessary.  
X
X
X
Check all cables and connections.  
Check the clutch, clutch springs and the clutch drum for wear. Replace if  
necessary by an autorized service workshop.  
Replace the spark plug. Check that the spark plug is fitted with a  
suppressor.  
X
X
Check and clean the spark arrestor screen on the muffler (only applies to  
mufflers fitted with a catalytic converter).  
RS52: Lubricate the drive shaft with the special grease.  
Do this every three months.  
English – 29  
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TECHNICAL DATA  
Technical data  
Technical data  
RS44  
RS52  
Engine  
3
Cylinder displacement, cu.in/cm  
Cylinder bore, inch/mm  
Stroke, inch/mm  
2,70/44,3  
1,65/42  
1,26/32  
2700  
3,10/50,8  
1,77/45  
1,26/32  
2700  
Idle speed, rpm  
Recommended max. speed, rpm  
Speed of output shaft, rpm  
Max. engine output, acc. to ISO 8893  
Catalytic converter muffler  
13500  
10500  
2,0/9000  
No  
13500  
10500  
2,4/9600  
No  
Ignition system  
Manufacturer/type of ignition system  
EM/ET  
EM/ET  
NGK BPMR 7A/  
Champion RCJ 7Y  
NGK BPMR 7A/  
Champion RCJ 7Y  
Spark plug  
Electrode gap, inch/mm  
Fuel and lubrication system  
Manufacturer/type of carburetor  
Fuel tank capacity, US pint/litre  
Weight  
0,02/0,5  
0,02/0,5  
Zama C1Q  
1,70/0,8  
Walbro HDA  
1,60/0,75  
Weight without fuel, cutting attachment and guard, Lbs/kg 18,5/8,4  
20,1/9,1  
Sound levels  
(see note 1)  
Equivalent sound pressure level at the users ear,  
measured according to ANSI B175.3-1997, dB(A),  
min/max:  
100/103  
98/104  
Vibration levels  
Vibration levels at handles, measured according to  
2
ANSI B175.3-1997, m/s  
At idle, left/right handles, min.:  
2,5/2,7  
3,5/3,5  
3,3/3,3  
4,8/5,4  
3,4/4,0  
3,4/4,0  
1,4/3,0  
5,8/7,4  
At idle, left/right handles, max.:  
At max. speed, left/right handles, min.:  
At max. speed, left/right handles, max.:  
Note 1: Equivalent noise pressure level is calculated as the time-weighted energy total for noise pressure levels under various  
working conditions with the following time distribution: 1/2 idle and 1/2 max. speed.  
NOTE! Noise pressure at the user’s ear and vibration on the handles are measured with all the machine’s approved cutting  
equipment fitted. The table indicates the highest and lowest values.  
RS44/RS52  
Approved accessories  
Type  
Cutting attachment guard, Art. no.  
Centre hole in blades/cutters, Ø 20 mm  
Output shaft thread M12  
Multi 255-3 (Ø 255 3 teeth)  
Multi 300-3 (Ø 300 3 teeth)  
Opti XS 200-22 (Ø 200 22 teeth)  
Opti XS 225-22 (Ø 225 22 teeth)  
Polytrim Ø 300  
502 26 34-03  
502 26 34-03  
502 27 22-01  
502 03 94-05  
503 91 60-03 / 502 26 34-03  
503 91 60-03  
503 91 60-03  
-
Grass blade/grass cutter  
Saw blade  
Plastic blades  
Trimmer head  
Trimmy S II  
Auto 55  
Fixed  
Support cup  
With ball bearing  
-
30 – English  
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FEDERAL EMISSION CONTROL WARRANTY STATEMENT  
rights and responsibilities, you should contact your nearest  
authorized servicing dealer or call Jonsered, at Sweden +46-  
36-146500.  
YOUR WARRANTY RIGHTS AND  
OBLIGATIONS  
WARRANTY PERIOD Any warranted part which is not  
scheduled for replacement as required maintenance, or  
which is scheduled only for regular inspection to the effect of  
“repair or replace as necessary” shall be warranted for 2  
years.Any warranted part which is scheduled for replacement  
as required maintenance shall be warranted for the period of  
time up to the first scheduled replacement point for that part.  
The EPA (The US Environmental Protection Agency),  
Environment Canada and Jonsered are pleased to explain  
the emissions control system warranty on your 2001 and later  
small nonroad engine. In U.S. and Canada, new small  
nonroad engines must be designed, built and equipped to  
meet the federal stringent anti-smog standards. Jonsered  
must warrant the emission control system on your small  
nonroad engine for the period of time listed below provided  
there has been no abuse, neglect or improper maintenance of  
your unit.Your emmission control system includes Parts such  
as the carburetor and the ignition system. Where a  
DIAGNOSIS The owner shall not be charged for diagnostic  
labor which leads to the determination that a warranted part  
is defective, if the diagnostic work is performed at an  
approved Jonsered servicing dealer.  
warrantable condition exists, Jonsered will repair your small  
nonroad engine at no cost to you. Expenses covered under  
warranty include diagnosis, parts and labor.  
CONSEQUENTIAL DAMAGES Jonsered may be liable for  
damages to other engine components caused by the failure  
of a warranted part still under warranty.  
MANUFACTURER S WARRANTY  
COVERAGE  
WHAT IS NOT COVERED  
All failures caused by abuse, neglect or improper  
maintenance are not covered.  
The 2001 and later small nonroad engines are warranted for  
two years. If any emission related part on you engine (as  
listed above) is defective, the part will be repaired or replaced  
by Jonsered.  
ADD -ON OR MODIFIED PARTS  
The use of add-on or modified parts can be grounds for  
disallowing a warranty claim. Jonsered is not liable to cover  
failures of warranted parts caused by the use of add-on or  
modified parts.  
OWNER SWARRANTY RESPONSIBILITIES  
As the small nonroad engine owner, you are responsible for  
the performance of the required maintenance listed in your  
Operators Manual. Jonsered recommends that you retain all  
receipts covering maintenance on your small nonroad engine,  
but Jonsered cannot deny warranty solely for the lack of  
receipts or for your failure to ensure the performance of all  
scheduled maintenance. As the small nonroad engine owner,  
you should, however, be aware that Jonsered may deny you  
warranty coverage if your small nonroad engine or a part of it  
has failed due to abuse, neglect, improper maintenance,  
unapproved modifications or the use of parts not made or  
approved by the original equipment manufacturer.You are  
responsible for presenting your small nonroad engine to a  
Jonsered authorized servicing dealer as soon as a problem  
exists. The warranty repairs should be completed in a  
reasonable amount of time, not to exceed 30 days.If you have  
any questions regarding your warranty rights and  
HOW TO FILE A CLAIM  
If you have any questions regarding your warranty rights and  
responsibilities, you should contact your nearest authorized  
servicing dealer or call Jonsered, at Sweden +46-36-146500.  
WHERE TO GET WARRANTY SERVICE  
Warranty services or repairs shall be provided at all Jonsered  
authorized servicing dealers.  
MAINTENANCE, REPLACEMENT AND  
REPAIR OF EMISSION-RELATED PARTS  
Any Jonsered approved replacement part used in the  
performance of any warranty maintenance or repairs on  
emission-related parts, will be provided without charge to the  
owner if the part is under warranty.  
responsibilities, you should contact your nearest authorized  
servicing dealer or call Jonsered, at Sweden +46-36-146500.  
WARRANTY COMMENCEMENT DATE  
EMISSION CONTROL WARRANTY PARTS  
LIST  
The warranty period begins on the date small nonroad engine  
is delivered.  
1
2
3
4
Carburetor and internal parts  
LENGTH OF COVERAGE  
Intake pipe, airfilter holder and carburetor bolts.  
Airfilter and fuelfilter covered up to maintenance schedule.  
Ignition System  
Jonsered warrants to the initial owner and each subsequent  
purchaser that the engine is free from defects in materials and  
workmanship which cause the failure of a warranted part for  
a period of two years.  
1
2
Spark Plug, covered up to maintenance schedule  
Ignition Module  
WHAT IS COVERED  
REPAIR OR REPLACEMENT OF PARTS Repair or  
replacement of any warranted part will be performed at no  
charge to the owner at an approved Jonsered servicing  
dealer. If you have any questions regarding your warranty  
MAINTENANCE STATEMENT  
The owner is responsible for the performance of all required  
maintenance, as defined in the operator’s manual.  
English – 31  
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Trimmy SII  
1
2
7,0 m  
23'  
12 cm  
5"  
~ 3,5 m  
11'  
3
4
~ 15 cm  
7
5
6
6'  
"Clic"  
8
9
35-50 NM  
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Auto 55  
1
2
3
>1,1 Kw  
<1,1 Kw  
1.)  
2.)  
4
5
2,7 mm - 9,0 m  
3,0 mm - 7,5 m  
3,3 mm - 6,0 m  
15 cm  
6"  
8
7
6
15 cm  
6"  
15 cm  
6"  
15 cm  
6"  
10  
11  
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´®z+R:•¶5Q¨  
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1150269-95  
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´®z+R:•¶5Q¨  
2006-08-23  
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