FUXTEC FX-4MS131 Product information sheet

Original User Manual FX-4MS131_rev03

Original User Manual FX-4MS131_rev03
ORIGINAL USER MANUAL
Petrol brush cutter/grass trimmer
FX-4MS131
Your new device has been developed and designed to meet FUXTEC's high standards, such as
easy operation and user safety. Properly treated, this device will serve you well for years to come.
WARNING: To reduce the risk of injury, the user must read and understand this manual
before operating the device.
FUXTEC GMBH
KAPPSTRAßE 69, 71083 HERRENBERG, GERMANY

Original User Manual FX-4MS131_rev03
TABLE OF CONTENTS
1. Technical data ................................................................................................................ 4
2. Symbols on the machine ................................................................................................ 5
3. General Safety Instructions ............................................................................................ 7
4. Instructions for accessories ............................................................................................ 9
5. Component overview ................................................................................................... 13
6. Mounting the brush cutter ............................................................................................ 14
7. Cold start of the machine ............................................................................................. 18
8. Warm start of the machine ........................................................................................... 19
9. Trimming techniques .................................................................................................... 20
10. Maintenance and care .............................................................................................. 22
11. Troubleshooting ........................................................................................................ 26
12. Customer Service ..................................................................................................... 27
13. Warranty ................................................................................................................... 27
14. Disposal note ............................................................................................................ 27
15. EC Declaration of Conformity ................................................................................... 28
We are continually striving to improve our products. Therefore technical data and illustrations
can change!

Original User Manual FX-4MS131_rev03
1. Technical data
Type FX-4MS131
Engine type 1E139F, air-cooled; 4-stroke
Cubic capacity 31cm3
Maximum output power (kW)
(in accordance with ISO 8893) 0.8 kW / 6,000min-1
The maximum speed of the engine 10,000 min-1
Idle speed of the machine 3,000 ±200min-1
LPA at the operator station
98dB(A) (K=3dB)
Guaranteed LWA 113dB(A)
Maximum vibration values on the left handle 6.090m/s2
k=1.5m/s2
Maximum vibration values on the right handle
6.789m/s2
k=1.5m/s2
Maximum diameter of the thread Ф440mm (Φ2.5mm)
Rotation direction of the cutting device Counterclockwise (see the mark on
the plate)
Number of the handle 2 pieces
Dry weight (kg) 7.2
Fuel tank capacity (ml) 750
Oil tank capacity (ml) 80ml
Oil FUXTEC 4-stroke oil (SAE30)
Fuel consumption (kg/h) (in accordance with ISO
8893) 0.89
Specific fuel consumption (g/kWh) (in accordance
with ISO 8893) 380
Weight (net/gross) in (kg) 7.5 / 10.0

Original User Manual FX-4MS131_rev03
2. Symbols on the machine
WARNING! IMPROPER HANDLING CAN
LEAD TO SERIOUS INJURY
READ AND UNDERSTAND THIS USER MANUAL BEFORE
USE.
ALWAYS WEAR EYE PROTECTION, EAR PROTECTION,
AND HEAD PROTECTION
WEAR FOOT PROTECTION.
WEAR GLOVES (Sharp edge!).
DO NOT TOUCH THE ROTATING BLADE,
DANGER OF INJURY
ALWAYS KEEP 15 METERS AWAY FROM OTHER
PEOPLE
THE GUARANTEED NOISE LEVEL CORRESPONDS TO THE
LEGAL NOISE GUIDELINES
WARNING OF FLYING OBJECTS

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NO SMOKING AND OPEN FLAMES ON THE DEVICE
WARNING:
DANGER OF HOT COMPONENTS
ALWAYS TURN THE MACHINE ON AND MAKE SURE THE
CUTTING TOOL IS STOPPED BEFORE CLEANING,
REMOVING, OR ADJUSTING THE BLADE.
WARNING:
FUMES FROM THIS PRODUCT CONTAIN
CHEMICALS THAT CAUSE CANCER, BIRTH DEFECTS
AND FURTHER CAN LEAD
WARNING! NEVER CHANGE THE MACHINE. IMPROPER
USE OF THE MACHINE CAN CAUSE SERIOUS OR FATAL
PERSONAL INJURY.
Before use, fill in 70ml of engine oil 4-strokes and check
every 10 hours.
Warning! Flammable materials!
The maximum speed of the spindle (grass trimmer): 6600 min-1
The maximum speed of the spindle (brush cutter):7100 min-1
Please follow the instructions for refuelling

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Do not allow others to use this machine unless they are fully responsible and have read and
understood the machine manual and are trained in its operation.
Extensive use of a tool exposes the user to shocks that can lead to white
finger disease (Raynaud's syndrome) or carpal tunnel syndrome. This
condition reduces the hand's ability to feel and regulate temperatures, causes numbness and
sensations of heat, and can lead to nerve and circulatory damage and tissue death. Not all factors
leading to white finger disease are known. Still, cold weather, smoking, and conditions affecting
blood vessels and circulation, as well as extensive or prolonged exposure to shocks, are
mentioned as factors in the development of white finger disease. To reduce the risk of white finger
disease and carpal tunnel syndrome, please note the following
Wear gloves and keep your hands warm.
Take regular breaks.
All the above precautions cannot eliminate the risk of white finger disease or carpal tunnel
syndrome. Long-term and regular users are, therefore, advised to monitor the condition of their
hands and fingers closely. Consult a doctor immediately if any of the above symptoms occur.
The operating noise of the tool may damage your hearing. Wear a sound-
proofing (Oropax or ear muffs) to protect it. Long-term and regular users are
recommended to check your hearing regularly. Be especially vigilant and careful when
wearing hearing protection as it limits your ability to hear warnings (cries, alarms, etc.).
 WARNING: Some noise exposure from this device cannot be avoided. Do not
work in noisy environments during approved and designated times. If necessary,
observe rest periods and limit the working time to the absolute minimum. For your
protection and protection of persons in the vicinity, wear suitable hearing protection.
3. General Safety Instructions
This machine may only be used for mowing or trimming grass, weeds, and undergrowth. Never
use it for other purposes, as this may cause injuries!
Correct safety instructions must be observed. DO NOT EXPOSE YOURSELF OR

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OTHERS TO DANGER. Follow these general safety instructions.
 Always wear safety glasses for eye protection. Long hair must be tied back. Do not
wear loose clothing or jewellery that can get caught in moving parts of the machine.
Safe, stable, non-slip safety shoes must always be worn. It is recommended that
legs and feet are covered to protect against fly debris during operation.
 Check the entire machine for loose parts over (nut, bolt, screw, etc.). Maintain or
replace them if necessary,
before you use the device. Do not use accessories with this drive head other than
those recommended by our company. Otherwise, severe
injuries to the user or bystanders and
damage to the machine may result.
 Keep the handles free of oil and fuel.
 Always use the correct handles and shoulder strap when cutting.
 Do not smoke when mixing the fuel or filling the tank.
 Do not mix fuel in a closed room or near open fires. Ensure sufficient ventilation/air
circulation.
 Mix and store the fuel mixture in a marked
container approved for such consumption according to local
regulations.
 Never remove the fuel tank cap while the machine is running.
 Do not operate the machine in a closed room or building. Exhaust gases contain
dangerous carbon monoxide.
 Do not attempt to adjust the machine while running or carrying the device. Always
adjust the machine on a flat, free surface.
 Do not use the machine if it is damaged. Never remove the protection of the device.
Otherwise, severe injuries of the operator or spectators, as well as damage to the
device, can result.
 Check the area to be cut and remove any debris that may be entangled in the nylon
cutting head or cutting blade. Also, remove any objects that the machine may throw
around while cutting.
 Never leave the machine unattended.
 Do not reach far forward. Maintain a firm stand and balance at all times. Do not let
the machine run while standing on a rope ladder or any other unstable standing
position.
 Children must not have access to the machine. Spectators should be kept
at a safe distance from the work area, at least 15 METERS.

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 Keep hands and feet free of the nylon cutting head or metal blade during the
operation.
 Do not use the machine if you are tired, sick, or under the influence of medication,
drugs, or alcohol.
 Use an undamaged nylon cutting-head. If you hit a stone or any other obstacle, stop
the machine and check the nylon cutting head. Never use a defective or unbalanced
nylon cutting head.
 Before starting, after failure or impact, be sure to check the device and make sure it is
in good condition.
 Attention! Local regulations may limit the use of the machine.
 Always keep the device with the cutting tool in good condition.
 Note, improper maintenance, use of non-compliant spare parts or removal or
modification of safety devices can cause damage to the device and severe injury to
the person working with it.
 Secure the device properly during transportation to prevent loss of fuel, damage to the
device, and injury.
 For machines with a clutch, regularly check that the cutting attachment stops
rotating when the engine is idling.
 Before each use, check the machine for loose fasteners, fuel leaks, damaged parts,
etc. Replace damaged parts before use.
 It is necessary to take sufficient breaks and change the working position regularly.
4. Instructions for accessories
 Do not store the machine in an enclosed area where fuel vapours can reach an
open fire from water heaters, stoves, etc. Store the device in a well-ventilated area
only.
 Make sure that your product is only equipped with original accessories. These parts
are available from your dealer. The use of any other accessories or attachments
may cause injury to the user and damage to the machine.
 Clean the machine thoroughly, mostly the fuel tank and air filter. All fuel must be
removed after using the
device.
 IMPORTANT: When filling fuel, make sure that the machine is off and cooled down.
Never refuel when the device is running or hot. If gasoline is spilt, wipe it up before
starting the engine.
 Keep at least 15m distance to other persons during the work.
 If you, as a spectator, approach a user of the machine, carefully attract his attention
and confirm that the user stops the engine. Please do not startle or distract the user.
Otherwise, you could cause an unsafe situation.

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 Never touch the nylon cutting head or metal blade when the machine is running. If it
is necessary to replace the guard or cutting tool, be sure that the machine and
cutting tools have stopped.
 The machine must be OFF before changing the machine's working range.
 Please make sure that the nylon cutting head does not hit against stones or
other hard objects.
 Please always make sure that screws have not become loose or that the machine
does not overheat.
 If necessary, have the machine serviced by an authorized dealer. If the device is
defective, do not let it continue to run.
 When starting or operating the machine, never touch hot parts like the exhaust, the
ignition cables, or the spark plug.
 After the machine has stopped, the exhaust is still hot. Never place the device near
inflammable materials (dry grass, inflammable gases, or inflammable liquids, etc.).
 Take special care that the ground can be slippery when operating the machine in the
rain or immediately after rain.
 If you slip or fall to the ground, release the throttle immediately.
 Be careful not to drop the machine or hit it against obstacles.
 Before adjusting or repairing the machine, make sure that the device is stopped, and
the spark plug connector is removed.
 If the machine is to be stored for an extended period, drain fuel from the fuel tank
and carburettor, clean the parts, place the device in a safe place and ensure that
the machine has cooled down completely.
 Carry out constant checks to ensure safe and efficient operation. For a complete
inspection of your machine, please contact a specialist workshop.
 Keep the machine away from fire or sparks.
 Be careful when using it. There is a danger of kick-back and recoil.
 Use extreme caution when using this machine with the cutting blade. A cutting blade
kick-back is a reaction that can occur when the rotating cutting blade hits an object
that cannot be cut. This contact causes the cutting knives to stop for a moment and
then suddenly push away from the hit object with accelerated force. This kick-back
reaction can be severe enough that the operator loses control of the machine. A
cutter blade kick-back can occur without warning if the cutter blade encounters an
obstacle, becomes blocked, or jams. This is more likely in areas where it is difficult
to see the material being cut. For easy and safe cutting, approach the weeds to be
mowed from your right to your left side. If an object or stick of wood is hit
unexpectedly, this can reduce a cutter blade kick-back.

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CUTTING WITH A CUTTING BLADE
A metal sheet with 3 teeth is equipped with the machine.
The metal blade is used for cutting bushes and weeds up to 3/4" in diameter. The use of the
saw blade with this machine is prohibited.
WARNING DANGER
Additionally, wear head, eye, face, and hearing protection and shoes
against smooth surfaces. Do not wear bars, jewellery, or
loose, dangling clothes that could get caught in the machine.
Do not wear footwear with unprotected toes and do
not work barefoot or without leg protection. In certain situations,
you must wear head protection.
WARNING DANGER
Do not cut with blunt, cracked or damaged metal sheets.
Before working, check the surface for obstacles such as stones, metal bars or
other objects. If they cannot be removed,
mark this position to avoid collision with
the sheet. Lines can become entangled on the blade head and flap or be whirled
into the air.
WARNING DANGER
Do not use the brush cutter to cut out trees.
WARNING DANGER
Always use the shoulder strap. Adjust and fix the belt and
belt clamping plate on the machine so that the machine hangs a few cm above
the floor.
The cut-out head and the protective shield should be aligned horizontally
in all directions. Pre-tension the machines on the right side of your
body.

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The shoulder strap is equipped with a quick-release device
(see picture). You can quickly remove the shoulder strap
by pulling the quick release.
Read the manual carefully. Be thoroughly familiar with the
controls and correct use of the machine. Learn how to stop
the machine and how to turn off the device. Understand how to stop and shut down the device.
Understand how to release a clamped attachment quickly.
Do not allow anyone to use the machine without correct instructions. Be sure that the user
wears a foot, leg, eye, face, and hearing protection. Keep the area clear of bystanders,
children, and pets. Never allow children to operate or play with the machine.
Never allow anyone to enter the HAZARDOUS ZONE while working with you. The DANGER
ZONE is an area with a radius of 15 meters (approximately 16 steps) or 50 feet. Insist that
persons in the DANGER ZONE wear eye protection from thrown objects beyond the danger
zone. If the machine is to be used where there are unprotected people, operate at a low,
reduced speed to reduce the risk of an object thrown.

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5. Component overview
1. BLADE (3-tooth)
2. CUTTING KNIFES
3. PROTECTIVE SHIELD
4. DRIVE AXLE
5. U-HANDLE
6. ASSISTANCE HANDLE
7. HANDLE
8. THROTTLE LOCK*
9. ENGINE STOP SWITCH
10. SAFETY INTERLOCK
11. GAS LEVER
12. TANK
13. FUEL CAP
14. CONNECTOR
15. WING SCREW
16. SHOULDER STRAP
*8 GAS LEVER LOCK prevents accidental acceleration of the engine. The throttle stick can only be pressed
when the throttle stick lock is pressed.

Original User Manual FX-4MS131_rev03
6. Mounting the brush cutter
Attaching the handle
The handle must be mounted before use.
For correct installation, follow the illustrations below.
Mounting the handle tube for use
Place cup B on the shaft tube, up and down, screw both cups and the shaft tube together.
Put the handle into the provided clamping bush, which is already attached to the shaft tube.
Now place the other shell on top and screw both half-shells and the grip tube together.
Please pay attention to the illustration "Components" to ensure that the handle is in the
correct position!
Mounting the drive axle
1). Place the drive axle against the main shaft so that the hole of
the axle is aligned with the locking bolt of the connecting piece.
2). Actuate the locking pin and insert the drive axle into the main
shaft. Release the locking pin and ensure that the locking pin
engages in the hole.
3). Turn the wing screw clockwise to secure the connection.

Original User Manual FX-4MS131_rev03
Installing the protective shield
Install the blade guard on the driveshaft tube against the
gear housing. Tighten the holder of the guard so that the
blade guard does not move or slide down during
operation.
Mounting the grass trimmer
Step 1:
Insert the key (1) into the hole in the gear head so that the gear shaft is locked. Unscrew and
remove the nut. Since it is a safety nut, please make sure that there is a left-hand thread here
Step 2:
mount the distance disk (2) and install the thread spool on the gear shaft. And then tighten it
by hand.
Warning!
Make sure that all components are correctly assembled and installed and that all screws are
tightened.
2
1

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2
4
3
Installation of the protective shield
Install the protective shield on the driveshaft tube
against the gear housing. Tighten the holder of the
guard so that the blade guard does not move or slide
down during operation.
Mounting the metal blade
steps:
1. Place the key (1) in the hole at the gear head.
2. Remove the nut, the cover (4), and the
upper distance disk (3) from the gear shaft
3. Place the metal sheet on the lower
distance disk (2). Make sure that the marked
side of the cutting blade is in contact with the disc (2).
4. Slide the upper distance disk (3) over the
gear shaft on the metal sheet. Make sure the upper side
of the cutting blade is in contact with the
distance disk (3).
5. Put on the cover (4) and screw
the union nut tight with locked gear head
(see point 1)
1

Original User Manual FX-4MS131_rev03
Check the oil level.
1 Place the engine horizontally on the floor.
2 Unscrew the dipstick and check the oil level,
which should be up to the oil filler neck
3 If the oil level is too low, add the recommended oil
up to the oil filler neck.
4 Close the oil cap.
WARNING
The capacity of the oil tank is 75ml.
Due to the low capacity, it is necessary
to fill the oil slowly to avoid overflow and spillage.
Check the oil level every 10 working
hours and top up if necessary
WARNING
We recommend the Oregon 4-stroke oil
or other brand oils
SAE 10W-30 in average ambient temperature.
WARNING
The use of 2 stroke oil is not allowed and reduces the life of the engine. The
recommended operating temperature is between -5℃ and +40℃
Recommended fuel
It is recommended to use unleaded gasoline with an octane number of 90 # or higher to reduce
carbon deposition in the combustion chamber. Do not use old or dirty gasoline. Do not use a fuel
mixture of engine oil and gasoline. Keep the fuel tank dust-free and avoid water getting into the
tank. Sometimes misfiring will occur due to usual overload.
If the backfires are heard under the average load, we recommend changing the gasoline. If the
misfire is still present afterwards, please consult an authorized workshop.
WARNING
● Gasoline is highly flammable, and sparks can cause an explosion.
● Refuel only in well-ventilated rooms and let the engine cool down before filling. Smoking and
max. filling
level engine
oil
Ambient temperature
Fuel filler cap
max. filling le
vel

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open fire, as well as any sparks, must be avoided during refuelling.
● Do not overfill the tank (the level should not be higher than the tank nozzle).
After refuelling, check that the tank cap is closed correctly.
● Avoid spilling any gasoline.
● Keep the machine away from children
Tank capacity: S35 (139F/P-B) 0.6L
Gasoline with an ethanol content
The engine can be operated with E10 gasoline. However, do not use gasoline with
the higher ethanol content of 10%.
7. Cold start of the machine
1. Place the device on a firm and flat surface.
Slide the engine stop switch down.
2. Move the choke lever upwards to "COLD START."
3. Press the carburettor pump about 8-10 times (until gasoline flows in the line)
4. Pull out the starter rope with a short-stroke until
resistance is felt
(about 100mm). A continuous, mainly fast train will provide a
strong spark, and the engine will respond after 2-3 trains.
5. Important: After the engine has responded, return the
choke lever to the "WARM START" position and immediately
pull the starter again until the engine starts. Also, see the
video "Device start" on our homepage.
6. Let the engine warm-up for about 10 minutes at idle
NOTE: If the machine does not start after repeated attempts, refer to troubleshooting chapters.
NOTE: Always pull the starter cord straight out. Pulling the starter at an angle will cause the rope
to rub against the eyelet. Pulling the starter at an angle can cause the starter cord to fray or break.
Always hold the starter handle firmly when the rope pulls back. Never let the rope be thrown back
1
2
3
4
5

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from the pulled-out position. This could damage the starter device.
8. Warm start of the machine
1. Place the device on a firm and flat surface.
2. Move the engine stop switch down
3. Slide the choke to the "WARM START" position
4. Pull out the starter rope with a short-stroke until resistance is felt
(about 100mm). A continuous high-speed train will provide a strong spark and start the engine
If the machine does not start, please proceed again according to "Cold start of the machine
STOP MACHINE
Unlock the throttle lever. Let the machine return to idle. Push the engine stop switch until the
machine stops.
ADDITIONAL SAFETY INSTRUCTIONS
Before running your machine, repeat GENERAL SAFETY INSTRUCTIONS in this manual.
CAUTION
IF YOU are NOT familiar with the trimming techniques, practice with the MACHINE in the "OFF"
position.
ALWAYS TRIM OR CUT AT HIGH ENGINE SPEEDS. Do not run the machine slowly at the
beginning or when trimming.
ALWAYS MAKE DISTANCE IN WORKING AREAS from cans, bottles, rocks, etc. Striking objects
can cause serious injury to users or bystanders and can also damage the machine. If an object is
accidentally struck, immediately stop the MACHINE and check the device. Never run the machine
with damaged or defective parts.
DO NOT use the machine for any purpose other than trimming grass.
NEVER lift nylon cutting head above knee height when operating.
Do not run the machine on a slope if there is a chance of slipping or losing stability.
RELEASE OF THE NYLON CUTTING HEAD
To release fresh thread, leave the machine at full power and "push" on
Run nylon cutting head against the grass. The thread releases automatically.
The blade in the protective shield cuts off excess thread.
CAUTION: Remove grass deposits regularly to prevent overheating of the drive
axle. Grass build-up occurs when weed fibres become entangled around the shaft
under the protective shield. This condition prevents the shaft from cooling correctly.
Remove grass deposits with a screwdriver or similar tool only when the machine is
switched off.

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9. Trimming techniques
When properly equipped with a protective shield and nylon cutting head, your machine will trim
unsightly weeds and tall grass with extended reach and areas along fences, walls, land, and
around trees.
NOTE: Pay special attention when trimming on brick or stone walls, etc., which will cause rapid
weed wear.
TRIM MORE ACCURATELY
Swing the trimmer from side to side with a nylon cutting
head. Do not tilt the nylon cutting head while working. For
correct cutting height, trim in a test area beforehand. For
right cutting height, trim in
advance in a test area. Keep nylon cutting head at the
same level for the uniform depth
of the cut.
TRIMMING AROUND TREES
Trim around logs with a slow approach, so the thread does not contact the log. Walk around
the tree from left to right. Approach grass or weeds with the tip of the thread and tilt the nylon
cutter head slightly.
Replace nylon thread
1. Switch off the engine.
2. Place the trimmer on the floor so that the cutting tool is facing upwards with the bobbin.
3. Open the cutting device and the spool by turning the locking knob on the shock absorber.