1
READ & UNDERSTAND
INSTRUCTION MANUAL
Save all warnings and instructions for future reference.
GM B41
XSS41
Service centre: +44(0)1904727513
Mail: support@yardforce.co.uk
Web: www.yardforce.co.uk
SUMEC UK
Unit A&B Escrick Business Park
Escrick, York YO19 6FD
PETROL LAWNMOWER
Original Instructions
GB
2
Read this manual carefully prior to assembling and
operating the petrol lawnmower. It is dangerous to operate
this product without being familiar with these instructions.
Keep this manual in a safe place and have it ready for
future reference.
3
1
2
9
3
8
7
4
5
6
a b
e
c d
A
B
X
X
X
2
2
4
4
C
E
G
I
D
F
H
J
5
x3
1
2
K
M
L
6
GM B46A Original Instructions
CONTENT
Intended use 07
General safety warnings 07
Product safety warnings 10
Symbols 12
Technical data 15
Description of product 16
Installation 17
Operation 18
Maintenance and storage 21
Troubleshooting 24
CE declaration 25
7
INTENDED USE
This lawnmower has been designed for cutting grass. The machine is to be used only for its
prescribed purpose, any other use is deemed to be a case of misuse.
Please note that our equipment has not been designed for use in commercial, trade or
industrial applications. Our warranty will be voided if the machine is used in commercial, trade
or industrial businesses or for equivalent purposes.
GENERAL SAFETY WARNINGS
Safety Warnings
WARNING: Read all safety warnings and
instructions.
Failure to follow the warnings and instructions may
result in electric shock, re and/or serious injury.
WARNING! Read all safety warnings and
instructions designated by the symbol.
Save all warnings and instructions for future
reference.
Always ensure anyone intending to operate this machine
is fully conversant with the contents of this instruction
manual prior to assembling, maintaining or operating the
machine.
Perform assembly operations as described in this manual.
Failure to observe this warning may lead to serious injury,
death, or damage to the machine.
Always take care when removing the packaging to
prevent damage to you or to the machine.
IMPORTANT! Before assembling the machine, check all
the parts indicated in the manual are in the box. Inspect
all the parts for signs of damage. Do not assemble the
8
machine if you observe any damaged components.
NOTE: This lawnmower complies with the Noise Emission
Directive 2000/14/EC.
1. Keep this operating and maintenance manual in a safe
place for reference at a later date.
2. Read the instructions carefully. Be familiar with the
controls and the proper use of the equipment.
3. Never allow children or people unfamiliar with these
instructions use the lawnmower. Local regulations can
restrict the age of the operator.
4. Never mow while people, especially children or pets
are nearby. Keep in mind that the operator or user
is responsible for accidents or hazards occurring to
other people or their property.
5. This appliance is not intended for use by people
(including children) with reduced physical, sensory
or mental capabilities or lack of experience and
knowledge, unless they have been given supervision
or instruction concerning the use of the appliance by a
person responsible for their safety.
6. Never touch a rotating blade.
Personal safety
1. While mowing, always wear substantial footwear
and long trousers. Do not operate the equipment
when barefoot or wearing open-toed sandals.
2. Thoroughly inspect the area where the equipment
is to be used and remove all objects which can be
thrown by the machine.
GENERAL SAFETY WARNINGS
9
3. Petrol is highly ammable; store fuel in containers
specically designed for this purpose.
a) Refuel outdoors only and do not smoke while
refuelling.
b) Add fuel before starting the engine. Never remove
the cap of the fuel tank or add petrol while the
engine is running or when the engine is hot.
c) If petrol is spilled, do not attempt to start the
engine but move the machine away from the area
of spillage and avoid creating any source of ignition
until petrol vapours have dissipated.
d) Replace all fuel tank and container caps securely.
4. Replace faulty silencers.
5. Prior to use, visually inspect to see that the blade,
blade bolts and cutter assembly are not worn or
damaged. Replace worn or damaged blades and
bolts in sets to preserve balance.
Operation safety
1. Do not operate the engine in a conned space
where dangerous carbon monoxide fumes can
collect.
2. Mow only in daylight or in good articial light.
3. Avoid operating the equipment on wet grass,
where feasible.
4. Always be sure of your footing on slopes.
5. Walk, never run.
6. Mow across the face of a slope, never up and
down.
7. Exercise extreme caution when changing direction
GENERAL SAFETY WARNINGS
10
PRODUCT SAFETY WARNINGS
on slopes.
8. Do not mow excessively steep slopes.
9. Use extreme caution when reversing or pulling the
lawnmower towards you.
10. Stop the blade if the lawnmower has to be tilted
for transportation, when crossing surfaces other
than grass and when transporting the lawnmower
to and from the area to be mowed.
11. Never operate the lawnmower with defective
guards or without safety devices, for example
deectors and/or grass catchers, in place.
12. Do not change the engine governor settings or
overload the engine.
13. Start the engine carefully according to the
instructions and with feet well away from the
blade.
14. Do not tilt the lawnmower when starting the
engine.
15. Do not start the engine without the grass collector
in place.
16. Do not put hands or feet near or under rotating
parts. Keep clear of the discharge opening at all
times.
17. Never pick up or carry a lawnmower while the
engine is running.
18. Stop the engine and disconnect the spark plug
cable, making sure that all moving parts have
come to a complete stop:
a) Before clearing blockages or unclogging the chute.
b) Before checking, cleaning or working on the
lawnmower.
c) After striking a foreign object, inspect the
11
PRODUCT SAFETY WARNINGS
lawnmower for damage and make repairs before
restarting and operating the lawnmower.
d) If the lawnmower starts to vibrate abnormally,
check immediately.
19. Stop the engine and disconnect the spark plug wire
and make sure that all moving parts have come to a
complete stop before refuelling.
Maintenance and storage
1. Keep all nuts, bolts and screws tight to be sure the
equipment is in a safe working condition.
2. Never store the equipment with petrol in the tank
inside a building where fumes can reach an open
ame or spark.
3. Allow the engine to cool before storing in any
enclosure.
4. To reduce the risk of re, keep the engine, silencer and
petrol storage area free of grass, leaves or excessive
grease.
5. Check the grass collector frequently for wear or
deterioration.
6. For safety, always replace worn or damaged parts.
7. If the fuel tank has to be drained, this should be done
outdoors.
12
SYMBOLS
Safety symbols
The purpose of safety symbols is to attract your attention
to possible dangers. The safety symbols and the
explanations with them require your careful attention
and full understanding. The symbol warnings do not, by
themselves, eliminate any danger. The instructions and
warnings they give are no substitutes for proper accident
prevention measures.
WARNING: Be sure to read and understand all safety
instructions in this operator’s manual, including all safety
alert symbols such as “DANGER,” “WARNING,” and
“CAUTION” before using this tool. Failure to follow all
instructions listed below may result in electric shock, re
and/or serious personal injury.
SAFETY ALERT SYMBOL: Indicates DANGER,
WARNING, or CAUTION. May be used in conjunction
with other symbols or pictographs.
Symbol meaning
This page depicts and describes safety symbols that
may appear on this product. Read, understand and
follow all instructions on the machine before attempting
to assemble and operate.
13
SYMBOLS
Please read all of the safety and operating
instructions carefully before using this machine.
Read the instruction manual before operating.
Keep bystanders away - especially children and
pets.
Beware of sharp blades - remove the spark plug
lead before maintenance
No naked ames.
Appropriate ear, eye and head protection (PPE)
must be worn.
Add engine oil.
Only refuel with unleaded petrol.
Hot surfaces will burn the hands!
Warning! The lawnmowers exhaust gas contains
toxic substances. Do not run the engine in closed
or poorly-ventilated areas.
14
The blade continues to rotate for a period after
the machine is switched off. Do not touch the
blade until all the machine components have
stopped completely.
The product complies with the applicable
European directives, and an evaluation method
of conformity for these directives was done.
Sound level data (96 dB), in accordance with
Directive 2000/14/EC.
SYMBOLS
96
15
TECHNICAL DATA
Model GM B41
Engine type Single cylinder 4-stroke
Engine displacement 125cm
3
Engine power 1.8kW
Max. engine speed 3000r/min
Cutting width 41cm
Grass bag capacity 45L
Ignition T.C.I
Fuel tank capacity 0.8L
Oil tank capacity 0.47L
Measured sound power level 94 dB(A) K=1.5dB(A)
Guaranteed sound power level 93 dB(A)
Vibration 5m/s
2
k=1.5m/s
2
Spark type QC12YC
Net weight 21.5kg
WARNING: Depending on how the product is actually used, the vibration values
can differ from the declared total! Adopt proper measures to protect yourself against
vibration exposures. Take the whole work process, including times the product is
running under no load or switched off, into consideration. Proper measures include,
among others, regular maintenance and care of the product and its attachments,
keeping hands warm, regular breaks and proper planning of work processes.
16
DESCRIPTION OF PRODUCT
Parts description (Fig. A)
1. Engine-B&S 300
2. Cable clip
3. Hand tensioning knob
4. Start/stop lever
5. Top handle
6. Rope guide
7. Grass bag
8. Cutting height adjustment lever
9. Deck
Check the delivery parts (Fig. B)
Remove the machine from its packaging carefully and make sure that all of the following parts
are present:
a. Main mower deck (with upper handle)
b. Lower handle
c. Grass bag
d. Accessories
e. Manual
WARNING:If any parts are damaged or missing, do not operate this tool until these
parts are replaced. Failure to heed this warning could result in serious personal
injury.
NOTE: Always recycle the packaging in accordance with local recycling guidelines.
17
INSTALLATION
Installing the handle
1. Attach the lower handle onto the unit by using one bolt and one hand tension knob on
each side. (Fig. C)
2. Install the upper handle onto the lower handle by using one bolt and one hand tension
knob on each side. (Fig. D)
Fitting the cable clip
Ensure that the cable clips supplied are used to x the cable to the lower handle. (Fig. E)
Installing the grass bag
1. Attach the grass bag to the frame by xing all plastic hooks. (Fig. F)
2. Lift the safety ap with one hand and hook in the grass bag. (Fig. G)
3. Release the ejector ap to secure the grass bag in position.
Setting the cutting height (Fig. H)
CAUTION! The blade can cause serious injury. Before adjusting the mower height, stop the
engine and wait for the mower blade to stop completely.
1. Pull the lever towards the wheel, then move it forward or backward to adjust the cutting
height.
2. Move it to any one of the 7 positions for the desired cutting height.
3. Return lever into securing plate.
NOTE! Never use the lowest cutting height for the rst cut of the season or in
drought conditions. Only about one third of the grass height should be cut.
From position 1 to position 7, the cutting height ranges from 25mm to 75mm.
18
Checking the engine oil level and lling with engine oil.
CAUTION! The following procedures and adjustments must be performed before
the engine is started. Do not attempt to make any of these adjustments while the
engine is running.
CAUTION! To prevent engine damage the engine is shipped without oil or petrol.
The engine must be lled with the correct grade of oil and petrol before starting the
engine.
NOTE! Running the engine with a low oil level will cause engine damage. It is
recommend that, premium quality 4-stroke engine oil to be used. Using non-engine
oil can shorten the engine’s service life and using 2-stroke oil will damage the
engine.
CAUTION! Always use high quality engine oil (classied SAE30 oil or equivalent e.g
SAE 10W/30, often termed as 4 Stroke lawnmower oil). Never use additives with
recommended oil. To prolong the life of your engine it is important that the oil is
changed after the rst 5 hours of use.
NOTE! To check the engine oil level, stop engine and place the mower on a level
surface.
1. Remove the oil ller dipstick and wipe oil from it with a clean cloth.
2. Insert the dipstick into the oil ller neck and tighten the cap.
3. Remove the dipstick and check the oil level. The oil level must be between the min.
and max. marks on the dipstick. If near the lower level, ll to upper lever with the
recommended oil. Do not overll. Wipe away any spilt oil. (Fig. I)
4. Align the ribs of the cap with the groove of the ller neck. Then rotate 1/4 turn to secure
it.
Filling engine with engine fuel (Fig. J)
CAUTION! Always use clean, fresh unleaded petrol. Purchase fuel in quantities that
can be used within 30 days. Never mix oil with petrol.
CAUTION! Do not ll into the base of neck to allow for fuel expansion. Do not
overll the fuel tank.
WARNING! Petrol is highly ammable and extreme precaution must be taken when
handling or working with it. Keep out of reach of children.
WARNING! Refuel in a well-ventilated area with the engine stopped. Do not smoke
or allow ame or sparks in the area where the engine is refueled or where petrol is
stored. Avoid repeated or prolonged contact with skin or inhalation of vapour.
OPERATION
19
1. Clean the area around the petrol ller cap before removing. Remove the warning tag,
check the fuel level.
2. Rell the tank if the fuel level is low.
3. Refuel carefully to avoid overlling or spilling fuel. There should be no fuel in the ller
neck.
4. Clean up any overow or splashes of petrol before starting the engine.
5. Tighten the ller cap after lling, ensuring it is on tight.
START/STOP the engine
WARNING: The blade begins to rotate as soon as the engine is started.
NOTE: Do not operate the machine in enclosed or poorly ventilated areas as
the exhaust gas contains toxic substance. Keep hands, feet, hair and clothing
away from all the moving parts of the machine. The exhaust and other parts of
the machine will become hot during use. Make sure that the blade is securely
fastened before starting the engine.
NOTE: To start the engine, make sure that the spark plug boot is located on
the plug and the machine is lled with sufcient oil and petrol. When starting a
cold engine, press down the primer fully 3-5 times. (Fig. K)
WARNING! Too many presses on primer may cause engine to ood. When
starting a warm engine, the primer does not need to be used. If the engine
stops due to a lack of petrol, rell and press down the primer 3-5 times.
1. Stand behind the mower. Pull the engine Start/stop lever toward upper handle with one
hand and place the other hand on the starter handle. (Fig. L)
2. Pull the starter handle out approx. 10-15cm until you feel some resistance and then start
the engine with a sharp pull.
3. Once the engine is running, put the starter rope into the rope guide.
4. Release the engine start/stop lever; it will return to its initial position, the engine will
automatically switch off.
Starting procedure quick guide
1. Press the primer bulb 3-5 times.
2. Start/Stop bar activation
3. Pull cord handle
OPERATION
20
Mowing
WARNING! Always observe the strictest safety procedures when using the
lawnmower. Carefully read the safety instructions in this manual before using the
lawnmower.
WARNING! Never open the safety ap when the grass bag has been detached (to
be emptied) and the engine is still running. The rotating blade can cause serious
injuries!
1. Select your required setting.
2. Start the engine and allow it to run.
3. Keep a rm grip on the upper handle with engine stop/start lever and push it to start
mowing.
Good practice advice
1. Walk, never run with the mower. Be very careful when mowing uneven or rough ground.
2. Mow across slopes, never up and down.
3. Be careful when changing the direction of the mower on a slope.
4. Do not mow excessively steep slopes.
5. The best result will be achieved if the grass is dry. Wet grass will tend to clog the blade
and the grass collection system.
6. Grass grows at different rates at different time of the year. Never use the lowest cutting
height for the rst cut of the season or in drought conditions.
7. Only about one third of the grass height should be cut.
8. Do not remove grass debris in the mower casing or on the blade by hand or with your
feet. Instead use suitable tools such as a brush or broom.
9. To take off the grass bag, use one hand to lift up ejector ap and the other to grab onto
the carry handle. The ejector ap automatically falls down after removing the grass bag
and closes off the rear chute opening.
10. Empty the grass debris in the grass bag and ret grass bag to lawnmower.
NOTE: Before taking off the grass bag, switch off the engine and wait until the blade has
come to a stop.
NOTE: If any grass residue is caught in the discharge chute, clean it using a brush. Do not
remove grass debris in the mower casing or on the blade by hand or with your feet. Instead
use suitable tools such as a brush or broom. To ensure that the cut grass can be collected
into grass bag, the discharge opening and inside the mower casing must be cleared of any
blockage.
OPERATION
21
MAINTENANCE AND STORAGE
Storing the lawnmower for short periods
After mowing, please follow the actions below prior to placing the lawnmower in storage:
- Allow the engine to fully cool.
- Ensure the grass bag is empty.
- Clean all debris from under the mower deck.
Store the lawnmower on a at and level surface, with all 4 wheels on the ground.
Store in a dry, safe place which is not accessible by children or people who are not familiar
with operation.
Storing the lawnmower for extended periods
CAUTION! Do not empty the petrol tank in enclosed areas, near re or when
smoking. Petrol fumes can cause explosions and re. Always carry the product on
its gripping surfaces.
If the lawnmower is to be placed into storage at the end of the season, or if the mower is not
to be used for period longer than 6 weeks, storage maintenance must be performed on the
lawnmower.
Temperature uctuations cause condensation, which contaminates fuel and causes starting
problems. Simply emptying the machine of fuel will prevent this.
Empty the petrol tank with a petrol suction pump, if available, or use the tipping method.
Start the engine and let it run until any remaining petrol has been used up.
Change the oil at the end of every season. To do so, remove the used engine oil from a warm
engine and rell with fresh oil.
Remove the spark plug from the cylinder head. Fill the cylinder with approx. 20ml of oil from
an oil can. Slowly pull back the starter handle, which will bathe the cylinder wall with oil, and
screw the spark plug back in.
Clean the cooling ns of the cylinder and the housing.
Be sure to clean the entire machine to protect the paint.
Store the machine in a well-ventilated place.
Maintenance schedule
WARNING!
Before you tip the lawnmower onto its side, completely empty the fuel tank using a
petrol suction pump.
Never turn the mower upside down.
Before commencing any maintenance, always disconnect the spark plug.
Performing routine maintenance correctly on your lawnmower will ensure you get years of
trouble-free use.
Please keep this manual safe for future reference.
It is recommended that the following maintenance schedule is adhered to. This will ensure the
lawnmower operates correctly and is safe to use.
22
MAINTENANCE AND STORAGE
After every use After 12 hours use After 24 hours use After 36 hours use
Cleaning Clean Clean Clean Clean
Air lter / Clean Clean replace
Spark plug / check check replace
Engine oil check check check check
Cutting blade check check check replace
Cleaning
1. To ensure long life and good performance of the machine, it’s important to keep the
machine clean and well lubricated. Make sure the chute is clean and under the deck is
cleared from wet debris. (See also short term storage).
2. Do not allow grass cuttings and other debris to become dry and hard on any of the
mower surfaces, as this will directly affect the cutting and grass collection performance.
Make sure that the underside of the lawnmower deck is clean and clear.
3. Never clean the lawnmower with a water jet or high-pressure cleaner. The engine must
remain dry. Do not use aggressive cleaning agents or solvents, such as cold degreasers
or petroleum ether.
Cleaning or replacing the air lter
WARNING!
Never run the engine without the air lter element installed:
1. Loosen the fastener that holds the cover.
2. Open the cover and remove the lter.
3. To loosen debris, gently tap the lter on a hard surface. If the lter is excessively dirty,
replace with a new lter.
4. Install the lter.
5. Install the cover tabs into the slots.
6. Close the cover and secure with the fastener.
Cleaning or replacing the spark plug
1. Once the engine has cooled, pull off the spark plug boot with a twist. Remove the spark
plug using the socket spanner supplied.
2. Clean the plug with a wire brush.
3. Using a feeler gauge, set the gap to 0.51mm.
4. Install the spark plug carefully by hand to avoid cross-threading.
5. After the spark plug is seated, tighten with the spanner to compress the washer.
Changing the oil
Tilt the lawnmower towards the oil ller, have a container ready to catch the oil, and remove
the dipstick. Once the oil has been emptied, wipe clean any spillages.
Rell with 470ml SAE 30 oil or equivalent, i.e. SAE 5W/30, SAE 10W/30). When the dipstick
is rested on the ller pipe, the oil level must be between the min. and max. marks on the
dipstick.
23
MAINTENANCE AND STORAGE
See ‘Filling with engine oil’. Do not overll.
Start the engine and allow it to run briey.
Stop the engine, wait one minute and check the oil level. Top up if necessary.
Replacing the cutting blade (Fig. M)
WARNING! USE GLOVES.
Before you remove the grass collection bag, stop the engine and wait until the blade stops
completely.
You will need garden gloves (not provided) and a spanner wrench to remove the blade.
Always handle the blade with care - sharp edges could cause injury.
Don’t hold the blade directly by hand.
Renew your metal blade after 50 hours of mowing or after 2 years, whichever comes rst,
regardless of condition.
Regularly check your blade. If the cut of your grass is poor, the blade might be blunt.
Damaged blades not only result in a bad cut, they cause excessive vibration and
uneconomical running of the engine. If the blade has worn excessively and become pitted
and blunt, it should be replaced or sharpened.
Tip the machine slightly towards the oil ller pipe and reach under the deck.
Hold the blade and unscrew the blade bolt counterclockwise using a spanner wrench.
Remove the washer and the blade.
Inspect the blade adaptor for any signs of damage.
To t a new blade, position the blade on the two studs on the blade ange and then replace
the washer and bolts.
Check the washer is still slightly domed to keep the pressure on the bolt to stop it unwinding,
keeping the blade rmly secure. Then replace the washer (right way round!) and bolts.
Make sure the blade is correctly positioned, and then rmly tighten the bolt. Do not over
tighten. The up turn of the blade must project into the motor compartment.
24
TROUBLESHOOTING
WARNING: Always switch off the engine and pull the ignition cable before starting
any inspection or adjustment work.
If after making an adjustment or repair to the engine you let it run for a few minutes,
remember that the exhaust and other parts will get hot.
The following table provides solutions to common problems encountered with the
lawnmower:
Fault Possible cause Solution
Loud while
running,
machine
vibrates heavily
- Screws are loose
- Blade fasteners are loose
- Blade is unbalanced
- Check screws
- Check blade fasteners
- Replace blade
Engine does
not start
- Start/stop bar not pressed
- Primer bulb is empty
- Spark plug is defective
- Fuel tank is empty
- Engine may be ooded
- Press start/stop bar
- Press primer bulb 3-5 times
- Replace spark plug
- Rell with fuel
- Remove plug and dry,
Engine runs
unsteadily
- Air lter is soiled
- Spark plug is soiled
- Clean the air lter
- Clean the spark plug
Uneven
mowing results
- Blade is blunt
- Cutting height is too low
- Sharpen the blade
- Set correct height
Unsatisfactory
grass collection
- Cutting height is too low
- Blade is worn
- Grass bag is clogged
- Set correct height
- Replace the blade
- Clear any clogged grass debris
25
CE DECLARATION
To the provisions of Council Directives
We
SUMEC UK
Unit A&B Escrick Business Park
Escrick, York YO19 6FD
Declare that the product:
Description: PETROL LAWNMOWER
Model No. XSS41F / GM B41
Function: Cutting grass
Complies with the essential health and safety requirements of the following
directives:
Machinery Directive 2006/42/EC
Electromagnetic Compatibility Directive 2014/30/EU
Noise Directive 2000/14/EC amended by 2005/88/EC
Conformity Assessment Procedure as Per Annex VI
Measured Sound Power Level: 94 dB (A)
Declared Guaranteed Sound Power Level: 96 dB (A)
Relative Notied Body (NB no.0359):
Intertek Testing & Cercation Ltd., Davy Avenue, Knowlhill, Milton Keynes, MK5
8NL
The Emission of Pollutants directive 97/68/EC, as last amended by directive
2012/46/EU
Standards and technical specication referred to:
EN ISO 5395-1:2013
EN ISO 5395-2:2013+A1:2016+A2:2017
EN ISO 14982:2009
Authorized Signatory
Date: 11.10.2017
Signature:________________________
Place: YORK
Name: Mariana Hall
General Manager
SUMEC UK
Unit A&B Escrick Business Park
Escrick, York YO19 6FD
