GGP Italy SPA Brush Cutter ST291 Instructions Manual

							EN10HOW TO START - USE – STOP THE ENGINE
To avoid breaking the starter
rope, do not pull the whole length of it or let it
slide along the edge of the cable guide hole.
Release the starter gradually, to avoid letting it fly
back uncontrollably.
6. Pull the starter rope again until the engine
starts as normal.
Starting the engine with
the starter engaged causes the cutting
device to move, only stopping when the
starter is disconnected.
7. When the engine has started, press the throt-
tle trigger to disconnect the starter and allow
the engine to idle.
8. Let the engine run idle for at least 1 minute
before using the machine.
If the starter rope is pulled
repeatedly with the choke on, it may flood the
engine and make starting difficult.
If you have flooded the engine, remove the spark
plug and gently pull the handle on the starter
rope to eliminate any excess fuel; then dry the
spark plug electrodes and replace it on the
engine.
•Hot starting
When hot starting (immediately after stopping
the engine), follow the procedure indicated
above in points 1 - 4 - 5 - 6.
USE OF THE ENGINE (Fig. 8)
Cutting device speed is regulated by the throttle
trigger (2), located on the rear handgrip (4) or the
right handgrip (4a) of the handlebar.
The throttle trigger only works if the lockout (3) is
pressed at the same time.
The movement is transmitted from the engine to
the drive shaft by a centrifugal mass clutch that
prevents the shaft from moving when the engine
is running at minimum speed.
IMPORTANT

!WARNING!
IMPORTANTNever use the machine if
the cutting device moves when the engine is
running idle; if this is the case regulate the
minimum rate (see chap.8) and if the problem
persists please contact your dealer.
The correct running speed will be achieved by
pressing the throttle trigger (2) as far as possible.
Avoid using the engine at full
power for the first 6-8 working hours.
STOPPING THE ENGINE (Fig. 8)
To stop the engine:
–Release the throttle trigger (2) and allow the
engine to run idle for a few seconds.
–Set the switch (1) to “STOP”.
When you have reduced
speed to a minimum, it will take a few sec-
onds for the cutting device to stop
!WARNING!
IMPORTANT

!WARNING! 
						

							ENUSING THE MACHINE11
To respect people and the environment:
– Try not to cause any disturbance.
– Scrupulously comply with local regulations
and provisions for the disposal of waste
materials after sawing.
– Scrupulously comply with local regulations
and provisions for the disposal of oils,
petrol, damaged parts or any elements
which have a strong impact on the environ-
ment.
Prolonged exposure to
vibrations can cause injuries and neurovas-
cular disorders (also called “Renaud’s syn-
drome” or “white hand”), especially to people
suffering from circulation disorders. The
symptoms can regard the hands, wrists and
fingers and are shown through loss of sensi-
tivity, torpor, itching, pain and discolouring of
or structural changes to the skin. These
effects can be worsened by low ambient tem-
peratures and/or by gripping the handgrips
excessively tightly. If the symptoms occur,
the length of time the machine is used must
be reduced and a doctor consulted.
Always wear suitable
clothing when using the machine. Your deal-
er can provide you with all the information on
the most suitable accident-prevention
devices to guarantee your safety.
USING THE WEBBING (Fig. 10)
The machine must always
be used connected to the webbing worn cor-
rectly. Frequently check the efficiency of the
quick release mechanism used to quickly free
the machine from the belts in case of danger.
The webbing must be put on before connecting
the machine to the special coupling and the
belts must be adjusted to suit the operator’s
height and stature.
If the machine has more than one coupling hole,
use the most favourable point for keeping the
machine balanced when working.

!WARNING!

!WARNING!

!WARNING!USING THE MACHINE
When working, the
machine must always be firmly held in both
hands, keeping the power unit on the right of
the body and the cutting group below the line
of the belt.
Stop the engine immedi-
ately if the blade stops during sawing. Always
beware of a kickback, which could occur if a
blade encounters a solid object (logs, roots,
branches, stones, etc.). Do not touch the
ground with the blade. Kickbacks cause
blade recoils that are difficult to control, so as
to cause loss of control of the machine, com-
promise operator safety and cause damage
to the machine itself.
Before tackling a mowing job for the first time it
is advisable to gain the necessary familiarity with
the machine and the most suitable cutting tech-
niques, finding out how to wear the webbing cor-
rectly, firmly gripping the machine and making
the movements required by the job.
•
Choosing the cutting device
Choose the most suitable cutting device for the
job to be done, according to these general indi-
cations:
–
the 3-point bladeis suitable for cutting
brushwood and small shrubs up to 2 cm in
diameter;
–
the 4-point bladeis suitable for cutting resist-
ant grass over large surfaces;
–
the cutting line headcan eliminate tall grass
and non-woody vegetation near fences, walls,
foundations, pavements, around trees, etc. or
to completely clean a particular area of the
garden;
WORKING TECHNIQUES
a) 3-point blade (Fig. 11)
Start cutting above the undergrowth and then
move down with the scything blade so as to cut
the brush into small pieces.

!WARNING!

!WARNING!
7. USING THE MACHINE 
						

							EN12USING THE MACHINE
b) 4-point blade (Fig. 12)
Proceed using the machine as a traditional
scythe, with a circular movement of about 60-
90°, thus moving outside the undergrowth, and
so on.  
c) Cutting line head
Use ONLY nylon lines. The
use of metal lines, plasticised metal lines
and/or lines not suitable for the head can
cause serious injuries and wounds.
During use it is advisable to stop the engine peri-
odically and remove the weeds wound round the
machine, so as to prevent the drive tube from
overheating due to the grass caught under the
guard. 
Remove the caught-up grass with a screwdriver
to allow the rod to be properly cooled.
Do not use the machine
for sweeping, tilting the cutting line head.
The power of the engine could throw objects
and small stones 15 metres or more, causing
damage and injuries to people.
•Cutting in motion (Scything) (Fig. 13)
Proceed at a regular pace, with a circular motion
similar to a traditional scythe, without tilting the
cutting line head during the operation.
First try cutting at the right height in a small area,
so as to then achieve a uniform cutting height
keeping the cutting line head at a constant dis-
tance from the ground.
For heavier cutting it can be useful to tilt the cut-
ting line head by about 30°.
Do not work in this way if
there is the possibility of causing objects to
be thrown, which could harm people and ani-
mals and cause damage.
•Precision cutting (Trimming)
Keep the machine slightly tilted so that the lower

!WARNING!

!WARNING!

!WARNING!
part of the cutting line head does not touch the
ground and the cutting line is at the required
point, always keeping the cutting device at a dis-
tance from the operator.
•Cutting near fences/foundations (Fig.14)
Slowly approach the cutting line head to fences,
posts, rocks, walls, etc. without hitting them
hard. 
If the line strikes a solid object it could break or
become worn; if it gets tangled in a fence it
could break abruptly.
In any case, cutting around pavements, founda-
tions, walls, etc. can cause greater wear than
normal in the line.
•Cutting round trees (Fig.15)
Walk round the tree from left to right, approach-
ing the trunks slowly so as not to strike the tree
with the line and keeping the cutting line head
tilted forward slightly.
Remember that the nylon line could lop or dam-
age small shrubs and that the impact of the
nylon line against the trunk of bushes or trees
with soft bark could seriously damage the plant.
•
Adjusting line length when working (Fig. 16)
This machine is fitted with a “Tap & Go” head.
To release more line, tap the cutting line head
against the round with the engine at top speed:
the line will be released automatically and the
knife cut off the excess length.
END OF OPERATIONS
When you have finished your work:
–Switch off the engine as indicated above
(Chap. 6).
–Wait for the cutting device to stop and fit the
blade guard (if 3 or 4-point blades are used). 
						

							MAINTENANCE AND STORAGE 13EN
Correct maintenance is essential to maintain the
original efficiency and safety of the machine over
time.
During maintenance oper-
ations:
–Remove the spark plug cap.
–Wait until the engine is sufficiently cold.
–Use protective gloves when handling the
blades.
–Keep the blade protection device on,
except when intervening directly on the
blade.
–Never dispose of oils, fuel or other polluting
materials in unauthorised places.
CYLINDER AND SILENCER
To reduce fire risks, periodically clean the cylin-
der flaps with compressed air and clear the
silencer area to get rid of sawdust, branches,
leaves or other debris.
STARTING SYSTEM
To avoid overheating and damage to the engine,
always keep the cooling air vents clean and free
of sawdust and debris.
The starter rope must be replaced as soon as it
shows signs of wear.
NUTS AND SCREWS
Periodically check that all the nuts and screws
are securely tightened and the handgrips are
tightly fastened.
CLEANING THE AIR FILTER  (Fig. 17)
Cleaning the air filter is
essential to guarantee the efficiency and duration
of the machine. Do not work with a damaged fil-
ter or without a filter, as this could permanently
damage the engine. 
It must be cleaned after every 8-10 working
hours.
Clean the filter as follows:
–Press the tab (3), remove the cover (1) and the
filter element (2).
IMPORTANT

!WARNING!
–Wash the filter element(2) with soap and water.
Do not use petrol or other solvents.
–Leave the filter to dry in the open air. 
–Fit the filter element (2) and the cover (1) back
on.
CHECKING THE SPARK PLUG (Fig. 18)
Periodically remove and clean the spark plug
using a metal brush to get rid of any deposits.
Check and reset the correct distance between
the electrodes.
Replace the spark plug and fasten it firmly using
the supplied wrench.
The spark plug must be replaced with one with
the same characteristics whenever the elec-
trodes have burnt or the insulation has worn, and
in any case every 100 working hours.
TUNING THE CARBURETTOR
The carburettor is tuned by the manufacturer to
achieve maximum performance in all situations,
with a minimum emission of toxic gas in compli-
ance with the regulations in force.
In the case of poor performance contact your
Dealer for a check of the carburetion and engine.
•
Tuning minimum speed (Fig. 17)
The minimum speed must
only be tuned if the cutting device moves
when the engine idles.
Speed is reduced by turning the screw (4) anti-
clockwise until the cutting device stops moving.
The engine should continue to run as normal.
If the engine does not idle smoothly, turn the
screw clockwise to increase the speed.
The cutting device must
not move when the engine idles; contact your
dealer if you are not able to tune it to your
satisfaction.
!WARNING!

!WARNING!
8. MAINTENANCE AND STORAGE  
						

							ANGLE TRANSMISSION (Fig. 19)
Lubricate with lithium-based grease. 
Remove the screw (1) and put in the grease,
turning the shaft manually until grease emerges,
then replace the screw (1).
SHARPENING THE 3 OR 4-POINT BLADE
(Fig. 20)
Use protective gloves. If
sharpening is done without removing the
blade, disconnect the spark plug cap.
Sharpening must be done taking account of the
type of blade and cutting edges, using a flat file
and working all the points equally.
The references for correct sharpening are given
in Fig. 20:
A = Incorrect sharpening
B = Sharpening limits
C = Incorrect and unequal angles
It is important to retain the correct balance after
sharpening.
3 or 4-point blades can be used from both sides.
When one side of the points is worn, the blade
can be turned and the other side used.
The blade must never be
repaired, but must be replaced as soon as
signs of breaking are noted or the sharpening
limit is exceeded.
HEAD LINE REPLACEMENT
Follow the instructions attached to the head for
replacing the nylon line.
SHARPENING THE LINE CUTTING KNIFE
(Fig. 21)
–Remove the line cutting knife (1) from the
guard (2) by unscrewing screw (3).
–Fix the line cutting knife in a vice and sharpen
it using a flat file, being careful to retain the
original cutting angle.
–Refit the knife on the guard.

!WARNING!

!WARNING!EXTRAORDINARY MAINTENANCE
All maintenance operations not foreseen in this
manual must be performed exclusively by your
dealer.
All and any operations performed in unautho-
rised centres or by unqualified persons will total-
ly invalidate the warranty.
STORAGE
After every work stint, clean the machine thor-
oughly to remove all dust and debris, and repair
or replace any faulty parts.
The machine must be stored in a dry place away
from the elements and with the cover correctly
fitted.
LONG PERIODS OF DISUSE
If you are not going to use
the machine for a period of more than 2-3
months, we recommend you do a few things
before putting it away. This will make it easier
when you want to use the machine again and will
also prevent permanent damage to the engine.
•Storage
Before putting the machine away:
–Empty the fuel tank.
–Start the engine and run it idle until it comes to
a halt, so that it uses up all the fuel that is left
in the carburettor.
–Wait for the engine to cool down and remove
the spark plug
–Pour a teaspoon of fresh oil into the spark plug
hole.
–Pull the starter rope several times to deliver oil
to the cylinder.
–Replace the spark plug with the piston in the
dead end upper position (visible from the
spark plug slot when the piston is at maximum
stroke).
•Restarting work
When you wish to start using the machine again:
–Remove the spark plug.
–Pull the starter rope a few times to eliminate
excess oil.
–Check the spark plug as described in chapter
“Checking the spark plug”.
–Prepare the machine as indicated in the para-
graph entitled “Preparing for work”.
IMPORTANT
14MAINTENANCE AND STORAGE EN 
						

							TROUBLESHOOTING15EN
9. TROUBLESHOOTING
1)The engine will
not start or will not
keep running
2)The engine starts
but is lacking in
power
3)The engine runs
irregularly and lacks
in power when
revved
4)The engine gives
off an excessive
amount of smoke–Incorrect starting procedure
–Dirty spark plug or incorrect distance
between the electrodes
–Air filter clogged
–Carburetion problems
–Air filter clogged
–Carburetion problems
–Dirty spark plug or incorrect distance
between the electrodes
–Carburetion problems
–Incorrect composition of the fuel
mixture
–Carburetion problems–Follow the instructions (see chap-
ter 6)
–Check the spark plug (see chapter
8)
–Clean and/or replace the filter (see
chapter 8)
–Contact your dealer
–Clean and/or replace the filter (see
chapter 8)
–Contact your dealer
–Check the spark plug (see chapter
8)
–Contact your dealer
–Prepare the fuel mixture according
to the instructions (see chap. 5)
–Contact your dealer
PROBLEM LIKELY CAUSE SOLUTION 
						

							16TECHNICAL SPECIFICATIONSEN
Model .............................................. 28 Mono 28 Duplex 34 Mono 34 Duplex 40 Mono 40 Duplex
Noise level recorded (ISO 10884) dB(A)
with line cutter head ...................... 111,6 111,4 110,5 110,8 112,7 112,3
with 4-point blade.......................... 111,0 109,5 108,5 109,5 110,9 111,0
Noise level at the operator’s ear (EN 27917) dB(A)
with line cutter head ...................... 96,9 97,0 97,5 96,4 99,0 96,4
with 4-point blade  ........................ 98,6 95,8 96,0 94,8 98,2 96,1
Vibrations transmitted to the hand on the front handgrip (“MONO”) (ISO 7916) m/sec
2
at tick-over  ................................... 6,7 – 6,4 – 4,4 –
with line cutter head ...................... 7,4 – 8,1 – 7,9 –
with 4-point blade.......................... 9,5 – 4,9 – 7,2 –
Vibrations transmitted to the hand on the rear handgrip (“MONO”) (ISO 7916) m/sec
2
at tick-over  ................................... 4,2 – 4,4 – 3,4 –
with line cutter head ...................... 7,3 – 5,8 – 6,8 –
with 4-point blade.......................... 8,9 – 5,8 – 8,1 –
Vibrations transmitted to the hand on the left handgrip (“DUPLEX”) (ISO 7916) m/sec
2
at tick-over  ................................... – 3,1 – 2,2 – 2,1
with line cutter head  ..................... – 7,4 – 3,5 – 4,9
with 4-point blade.......................... – 9,5 – 3,9 – 5,3
Vibrations transmitted to the hand on the right handgrip (“DUPLEX”) (ISO 7916) m/sec
2
at tick-over  ................................... – 4,3 – 3,9 – 3,7
with line cutter head  ..................... – 7,3 – 2,7 – 6,0
with 4-point blade.......................... – 8,9 – 5,4 – 8,3
Engine .................................. 2-stroke air-cooled
Capacity / Power 
Mod. 28 ............................... 25,4 cm
3/ 0,8 kW
Mod. 34 ............................... 33,6 cm3/ 1,2 kW
Mod. 40 ............................... 40,6 cm3/ 1,2 kW
Engine rotation speed at tick-over  
Mod. 28 - 34 - 40 .................... 2600-2800 rpm
Maximum engine rotation speed 
Mod. 28  ................................. 9800-10200 rpm
Mod. 34  ................................... 9300-9700 rpm
Mod. 40  ............................... 10600-11000 rpm
Maximum tool rotation speed  
Mod. 28..  .......................................... 8000 rpm
Mod. 34  ............................................ 7600 rpm
Mod. 40  ............................................ 8650 rpmSpark plug................... LD L8RTF (or equivalent)
Mixture  .......... Petrol : 2-stroke oil  = 50:1 = 2%
Tank capacity
Mod. 28   ............................................. 750 cm
3
Mod. 34 - 40 ....................................... 900 cm3
Maximum permitted blade diameter
3-point blade  .................................. Ø 255 mm
4-point blade  .................................. Ø 255 mm
Weight 
1)
“MONO” models  ................. from 4.9 to 6.7 kg
“DUPLEX” models  .............. from 5.1 to 7.1 kg
1)Weight as per standard ISO 11806 (without
fuel, cutting devices and guards)  
10. TECHNICAL SPECIFICATIONS
Phonometric Recordings and Vibrations 
						

							FRPRESENTATION1
Cher Client,
Nous tenons avant tout à vous remercier de la préférence que vous avez accordée à nos produits, et
nous souhaitons que votre machine vous réserve de grandes satisfactions et réponde pleinement à
vos attentes. Ce manuel a été rédigé dans le but de vous permettre de bien connaître votre machine
et de l’utiliser en toutes conditions de sécurité et d’efficacité; n’oubliez pas qu’il fait partie intégrante
de la machine, tenez-le à portée de main pour le consulter à tout moment, et le jour où vous devriez
céder ou prêter la machine à quelqu’un, rappelez-vous de lui donner aussi ce manuel.
Cette nouvelle machine a été conçue et fabriquée conformément aux normes en vigueur, et elle ne
sera fiable et sûre que si vous l’utilisez dans le plein respect des indications contenues dans ce manuel
(usage prévu); toute autre utilisation, ou le non respect des normes de sécurité lors de lutilisation, de
lentretien et de la réparation qui sont indiquées dans le manuel, sont considérés comme un emploi
impropre: dans ce cas, la garantie perd tout effet et le fabricant décline toute responsabilité, en lais-
sant à la charge de lutilisateur les conséquences des dommages ou des lésions causés à lui-même
ou à autrui.
Si vous deviez trouver de légères différences entre la description donnée et la machine en votre pos-
session, tenez compte du fait que, dans le cadre de l’amélioration continuelle du produit, les informa-
tions contenues dans ce manuel sont sujettes à des modifications sans aucun préavis ni obligation de
mise à jour, sans toutefois que soient remises en cause les caractéristiques essentielles de sécurité et
de fonctionnement. En cas de doute, contactez votre revendeur. Bon travail!
SOMMAIRE
1.
Identification des pièces principales  ........................................... 22.Symboles ..................................................................................... 33.Prescriptions de sécurité  ............................................................ 44.Montage de la machine  .............................................................. 65.Préparation au travail  .................................................................. 86.Démarrage – Utilisation- Arrêt du moteur .................................... 97.Utilisation de la machine  ........................................................... 118.Entretien et conservation  .......................................................... 139.Localisation de pannes  ............................................................. 1510.Données techniques  ................................................................. 16 
						

							FR
PIÈCES PRINCIPALES
1. Ensemble moteur
2. Tube de transmission
3. Dispositif de coupe
a. Lame à 3 ou 4 pointes
b. Tête à fil
4. Protection du dispositif de coupe
5. Poignée avant
6. Protection
7. Guidon
8. Poignée arrière
9. Point dattache (du harnais)
10. Étiquette matricule
11. Harnais
12. Renvoi angulaire
13. Protection lame (pour le
transport)
14. Bougie
COMMANDES ET PLEIN DE
CARBURANT
21. Interrupteur d’arrêt du moteur
22. Commande d’accélérateur
23. Blocage de l’accélérateur
24. Lanceur
25. Commande du starter (s’il y en a
un)
26. Commande du dispositif d’a-
morçage (Primer) (s’il y en a un)
31. Bouchon du réservoir du mélan-
ge 2
IDENTIFICATION DES PIÈCES PRINCIPALES
1. IDENTIFICATION DES PIÈCES PRINCIPALES
ÉTIQUETTE MATRICULE
10.1) Marquage de conformité, selon la directi-
ve 98/37/CE
10.2) Nom et adresse du fabricant
10.3)Niveau de puissance acoustique LWA
selon la directive 2000/14/CE
10.4) Modèle de référence du fabricant
10.5) Modèle de machine
10.6)  Numéro de série
10.7)  Année de construction10.1
LWA
dB
10.2
10.610.410.510.7
10.3
1
“DUPLEX”2
412
13
3a
6
7
8
9
1011
3b
21
23
22
21
23
22
14
25
26
31
1
5
3
“MONO”
24 
						

							FR
1)Attention ! Danger. Cette machine, si elle
n’est pas utilisée correctement, peut être dange-
reuse pour vous-même et pour les autres.
2)Lire le manuel dinstructions avant dutiliser la
machine.
3)L’opérateur préposé à cette machine, si elle
est utilisée en conditions normales pour un
usage quotidien continu, peut être exposé à un
niveau de bruit égal ou supérieur à 85 dB (A).
Utiliser des protections acoustiques et porter le
casque de protection.
4)Porter des gants et des chaussures de sécu-
rité!
11)Réservoir du carburant
12)Positions de l’interrup-
teur d’arrêt du moteur
a= arrêtb= marche
13)Réglage du minimum
14)Commande du starter
15)Commande du dispositif
d’amorçage (Primer) 
16)Position correcte de la
poignée sur le tube de
transmission
5)Danger de projections! Pendant l’emploi de la
machine, éloigner toute personne ou tout animal
domestique d’au moins 15 mètres!
6)Ne pas employer de lames en scie circulaire.Danger: L’utilisation de lames en scie circu-
laire avec des machines qui portent ce sym-
bole expose leur utilisateur à un risque de
lésions très graves ou même mortelles.
7)
Vitesse maximum du dispositif de coupe.
N’utiliser que de dispositifs de coupe adéquats.
8)Indication de niveau de puissance acoustique
LWA selon la directive 2000/14/CE.
SYMBOLES3
SYMBOLES EXPLICATIFS SUR LA MACHINE
(si présents)
2. SYMBOLES
7
123
56
4
8
-1     min
ab 11
12
13
14
15
16
21)Dispositifs de
coupe pour les-
quels la protec-
tion est adéquate
22)À employer avec
la tête à fil
23)Sens de rotation
du dispositif de
coupe
SYMBOLES EXPLICATIFS SUR LES PRO-
TECTIONS (si présents)
21
22
23