Jonsered GR41, GR50, RS44, RS51 Operator's Manual
Operator's manual
Please read these instructions carefully and make sure you understand
them before using the machine.
2 – English
Symbols
SYMBOL EXPLANATION
WARNING! Clearing saws,
brushcutters and trimmers can be
dangerous!
Careless or incorrect use can result in
serious or fatal injury to the operator
or others.
Read through the Operator‘s Manual
carefully and understand the content
before using the machine.
• Use anti-slip and stable boots.
• Always wear approved protective
gloves.
• Only use non-metallic, flexible
cutting elements, that is trimmer
head with trimmer cord.
Always use
• A protective helmet where there is
a risk of falling objects
• Ear protection
• Approved eye protection
• Max. speed of output axle, rpm
• This product is in accordance with
applicable CE directives.
• Beware of thrown objects and
ricochets.
Checks and/or maintenance should
be carried out with the engine
switched off, with the stop switch in
the STOP position.
Always wear approved protective
gloves.
Regular cleaning required.
Ocular control.
Approved eye protection must always
be used.
50FT
15 m
50FT
15 m
• The operator of the machine shall
ensure, while working, that no
persons or animals come closer
than 15 metres.
• Machines fitted with clearing or
grass blades can be thrown
violently to the side when the
blade comes into contact with a
fixed object. The blade can cause
the amputation of arms and legs.
Always keep people and animals at
least 15 metres from the machine.
English – 3
CONTENTS
List of contents
SYMBOL EXPLANATION
Symbols ............................................................................... 2
CONTENTS
Before using a new machine ................................................. 3
List of contents .................................................................... 3
SAFETY INSTRUCTIONS
Personal protective equipment ............................................. 4
The machine‘s safety equipment .......................................... 4
Control, maintenance and service of the machine‘s safety
equipment ...................................................................... 7
Cutting equipment ............................................................ 10
General safety instructions ................................................. 11
General working instructions ............................................. 12
Basic clearing techniques .................................................... 13
WHAT IS WHAT?
What is what on the clearing saw (GR41/GR50/RS44)? .... 17
What is what on the clearing saw (RS51)? .......................... 18
ASSEMBLY
Assembling the handlebars ................................................. 19
Transport position, handlebars ........................................... 19
Assembly of the blade and trimmer head............................ 20
Assembling the blade guard and grass blade ....................... 20
Assembling the blade guard and clearing blade................... 20
Assembling the spray guard and trimmer head
Trimmy SII .................................................................. 21
Assembling other guards and cutting equipment ................ 21
Adjusting the harness and clearing saw ............................... 21
FUEL HANDLING
Fuel mixture ...................................................................... 22
Fuelling.............................................................................. 22
ST ART AND STOP
Control before starting....................................................... 23
Start and stop..................................................................... 23
MAINTENANCE
Carburettor ........................................................................ 24
Muffler .............................................................................. 25
Cooling system .................................................................. 25
Air filter ............................................................................. 25
Angle gear .......................................................................... 25
Spark plug.......................................................................... 26
Filing the grass blade .......................................................... 26
Sharpening the clearing blade ............................................ 26
Maintenance schedule ........................................................ 27
TECHNICAL DATA
GR41................................................................................. 28
GR50................................................................................. 28
RS44.................................................................................. 28
RS51.................................................................................. 28
Before using a new machine
• Read the Operator‘s Manual carefully.
• Check the assembly and adjustment of the cutting
equipment. See page 20-21.
• Start the machine and check the carburettor settings. See
page 23-24.
IMPORTANT! A too lean carburettor adjustment significantly
increases the risk of an engine breakdown.
Insufficient care of the air filter will cause deposits on the spark
plug resulting in starting difficulties.
!
WARNING!
Under no circumstances may the design
of the machine be modified without the
permission of the manufacturer. Always
use genuine accessories. Non-authorised
modifications and/or accessories can
result in serious personal injury or the
death of the operator or others.
4 – English
The machine‘s safety equipment
This section describes the machine‘s safety equipment, its
function and how checks and maintenance are carried out to
ensure that it operates correctly. (See the chapter “What is
what“ to locate where this equipment is positioned on your
machine.)
Personal protective equipment
SAFETY INSTRUCTIONS
!
WARNING!
Never use a machine with defective safety
equipment. Follow the control,
maintenance and service instructions
described in this section.
1. Throttle trigger
lock
The throttle trigger lock is
designed to prevent the
throttle from accidentally
being engaged. When the
trigger lock (A) is pressed
into the handle (= when you
hold the handle) the throttle
(B) is released. When the
grip on the handle is
released the throttle and the
throttle trigger lock return
to their original positions.
This takes place via two
independent return spring
systems. This means that the
throttle is automatically
locked in its “idling“
position.
A
B
IMPORTANT INFORMATION
• Incorrect or careless use of a clearing saw,
brushcutter or trimmer can turn it into a dangerous
tool that can cause serious or even fatal injury to
the operator or others. It is extremely important
that you read and understand the content of this
manual.
• When using a clearing saw, brushcutter or trimmer,
protective equipment approved by the appropriate
authorities must be used. Personal protective
equipment does not eliminate the risk of accidents,
however, it can reduce the effects of an injury in
the event of an accident. Ask your dealer for help
when choosing protective equipment.
HELMET
A helmet should be worn if
trees to be cleared are higher
than 2 metres.
EAR PROTECTION
Ear protection offering
sufficient dampening effect
should be used.
EYE PROTECTION
Blows from branches or
objects thrown by the
rotating cutting equipment
can damage the eyes.
GLOVES
Gloves should be worn
when necessary, e.g., when
assembling cutting
equipment.
BOOTS
Use anti-slip and stable
boots.
CLOTHING
Wear clothes made of a
strong fabric and avoid loose
clothing that can catch on
shrubs and branches.
FIRST AID KIT
A first aid kit should be
carried by operators of
clearing saws, brushcutters
or trimmers.
A
B
English – 5
2. Stop switch
The stop switch should be
used to stop the engine.
3. Cutting
attachment guard
This guard is intended to
prevent objects from being
thrown towards the operator
and to protect the operator
from unintentionel contact
with the cutting attachment.
4. Anti-vibration
system
Your machine is equipped
with an anti-vibration
system that has been
designed to give as vibrationfree and comfortable usage
as possible.
The use of incorrectly
wound cord or blunt,
incorrect cutting equipment
(incorrect type or incorrectly
sharpened, see section
“Filing the blade”) increases
the level of vibration.
The machine’s anti-vibration
system reduces the transfer
of vibrations between the
engine unit/cutting equipment and the machine’s
handle system. The engine
body including the cutting
equipment is suspended in
the handle system via a
vibration element.
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.
!
5. Quick-release
There is an easily accessible,
quick-release catch fitted to
the chest as a safety
precaution in the event of a
fire in the engine or for any
other situation that requires
you to free yourself from the
machine and harness. See the
section “Adjusting the harness
and clearing saw“.
!
SAFETY INSTRUCTIONS
WARNING!
Do not attach any blade to the unit
without proper installation of all required
parts. Failure to use the proper parts can
cause the blade to fly off and seriously
injure the operator and/or bystanders.
Under no circumstances may the cutting
equipment be used without an approved
guard fitted. See the chapter
“Technical
data”
. If the wrong guard or a defective
guard is fitted this can cause serious
personal injury.
6 – English
SAFETY INSTRUCTIONS
6. Muffler
The muffler is designed to
give the lowest possible noise
level and to direct the
engine‘s exhaust fumes away
from the operator. Muffler
fitted with catalytic
converter is also designed to
reduce harmful exhaust
components.
In countries that have a
warm and dry climate the
risk of fire is obvious. We
have therefore fitted certain
mufflers with a spark arrest
screen. Make sure that your
muffler is fitted with this
kind of screen.
It is extremely important
that the instructions for
checking, maintaining and
servicing the muffler are
followed. (See the section
“Control, maintenance and
service of the machine‘s safety
equipment“.)
7. Cutting
equipment
1) Clearing blades are
intended for cutting wood.
2) Grass blades are
intended for brush cutting.
3) The trimmer head is
intended for trimming
grass.
2
1
3
8. Locking nut
The locking nut secures the
cutting equipment on the
output shaft.
WARNING!
Mufflers fitted with catalytic converters
become extremely hot during use and
after stopping. This also applies at idling
speeds. Contact can result in burns to
the skin. Be observant to the risk of fire!
!
!
WARNING!
Bear in mind that exhaust fumes:
• contain carbon monoxide, which can
cause carbon monoxide poisoning.
Therefore never start or run the machine
indoors.
• are hot and can contain sparks that can
cause fires. Never start the machine
indoors or close to inflammable material.
English – 7
SAFETY INSTRUCTIONS
1. Throttle trigger
lock
• Check that the throttle is
locked in the “idling
position“ when the
throttle trigger lock is in
its original position.
• Press in the throttle
trigger lock and make sure
it returns to its original
position when released.
• Ensure that the throttle
and throttle trigger lock
move easily and that their
return spring systems
function.
The throttle trigger lock is
designed to prevent the
throttle from accidentally
being engaged. When the
trigger lock (A) is pressed
into the handle (= when you
hold the handle) the throttle
(B) is released. When the
grip on the handle is
released the throttle and the
throttle trigger lock return
to their original positions.
This takes place via two
independent return spring
systems. This means that the
throttle is automatically
locked in its “idling“
position.
Control, maintenance and service of
the machine‘s safety equipment
IMPORTANT INFORMATION
• All service and repairs to the machine require
special training.
• This applies especially to the machine‘s safety
equipment. If the machine 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.
• See section "Start". Start
the machine and apply full
throttle. Release the
throttle and check that the
cutting equipment stops
and remains at a standstill.
If the cutting equipment
rotates with the throttle in
the idling position then
the carburettor‘s idling
setting must be checked.
See chapter
“Maintenance“.
A
B
2. Stop switch
• Start the engine and make
sure that the engine stops
when the stop switch is
moved to the stop
position.
8 – English
SAFETY INSTRUCTIONS
3. Cutting
attachment guard
• Check that the guard is
undamaged and not
cracked.
• Replace the guard if it has
been exposed to impact or
is cracked.
• Always use the prescribed
blade an guard
combination, see chapter
"Technical data".
5. Muffler
1.Never use a machine that
has a defective muffler.
2.Check regularly that the
muffler is secure.
3.If your muffler is fitted
with a spark arrest screen
then it should be cleaned
regularly. A blocked
screen leads to the engine
overheating with serious
damage as a result. Never
use a muffler with a
defective spark arrest
screen.
4. Vibration
damping system
• Check the vibration
damping element
regularly for material
cracks and distortion.
• Check that the vibration
damping element is
securely attached
between the engine unit
and the handlebar unit.
English – 9
7. Quick-release
• Check that the harness
straps are correctly
positioned. When the
harness and machine are
adjusted, check the harness‘
safety release catch to
ensure it works correctly.
SAFETY INSTRUCTIONS
6. Cutting equipment
This section describes how through correct maintenance and
through using the right type of cutting equipment you can:
• Reduce the machine‘s tendency to kickback
• Obtain maximum cutting capacity.
• Increase the service life of the cutting equipment.
Four basic rules:
1)Only use the cutting
and guard equipment
we recommend! See
chapter “Technical
data“.
2)Keep the blade‘s teeth
well and correctly
sharpened! Follow our
instructions and use the
recommended filing
gauge. An incorrectly
sharpened or damaged
blade increases the risk
of an accident.
3)Keep the correct setting.
Follow our instructions
and use the
recommended setting
tool. An incorrectly set
blade increases the risk
of jamming and
kickback.
4)Check the cutting
equipment with regard
to damage and crack
formation. Damaged
cutting equipment
should always be
replaced.
!
WARNING!
Never use a machine with defective
safety equipment. The safety equipment
should be maintained as described in this
section. If your machine does not meet
any of these controls you should contact
your service workshop.
8. Locking nut
• Protect your hand from
injury when assembling,
use the blade guard as
protection when tightening
with a socket spanner.
Tighten the nut by turning
against the direction of
rotation. Loosen the nut by
turning in the direction of
rotation. (NOTE! the nut
has a left-hand thread).
• Tighten the nut using a
socket spanner, 35 - 50
Nm (3.5 - 5 kpm).
NOTE!
The locking nut‘s nylon lock
must not be so worn that it
can be turned by hand. The
lock shall hold at least 1.5
Nm. The nut should be
replaced after it has been put
on approx. 10 times.
10 – English
SAFETY INSTRUCTIONS
Cutting equipment
Sharpening the
grass blade
• See the cutting
equipment’s packaging for
correct filing instructions.
• The blades are sharpened
using a single cut flat file.
• Sharpen all edges equally
to maintain the balance of
the blade.
Trimmer head
• Only use a trimmer head
and trimmer cord that is
recommended. 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
cutting equipment we
recommend! See chapter
“Technical data“.
!
WARNING!
Always stop the engine before starting
work on any part of the cutting equipment.
This continues to rotate even after the
throttle has been released. Ensure that the
cutting equipment has stopped completely
and remove the cable from the spark plug
before you start to work on it.
IMPORTANT INFORMATION
Always ensure the trimmer cord is wound tightly
and evenly around the drum, otherwise harmful
vibrations will occur.
• Generally smaller machines require a small trimmer head
and vice versa. This is because when clearing using a cord
the engine must throw out the cord radially from the
trimmer head and also meet resistance from 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 the knife positioned 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 few days. This will make the line tougher and it will keep
longer.
Sharpening the
clearing blade
• See the cutting
equipment’s packaging for
correct filing instructions.
• A correctly sharpened
blade is a prerequisite for
working efficiently and to
avoid unnecessary wear to
the blade and clearing saw.
• Make sure that the blade is
well supported when you
use the file. Use a 5,5 mm
round file with a file
holder.
• The sharpening angle is
15°. Every other tooth is
sharpened to the right and
the intermediate tooth to
the left. When the blade
has been heavily pitted by
stones the upper side of
the teeth can, in
exceptional cases, need to
be dressed using a flat file.
In such cases this takes
place before sharpening
with the round file.
Dressing the top side must
be carried out equally for
all teeth.
• Adjust the setting. This
should be 1 mm.
IMPORTANT INFORMATION
The section describes how through correct mainte-
nance and through using the right type of cutting
equipment you can reduce the machine‘s tendency to
kickback, obtain maximum clearing capacity and
increase the service life of the cutting equipment.
• Only use the cutting and guard equipment we
recommend! See chapter “Technical data“.
• Refer to the instructions for the cutting
equipment for the correct winding of cord
and for the selection of the right cord diameter.
• Keep the blade’s teeht well and correctly
sharpened! Follow our recommendations. Also
refer to the instructions on the blade packaging.
• Maintain the correct setting. Follow our instructions and use the recommended filing gauge.
WARNING!
Incorrect cutting equipment or an
incorrectly sharpened blade increases
the risk of kickback.
!
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