Echo SRM-4300 User manual

ENGLISH
GB
WARNING
Read the instructions carefully and follow the rules for safe
operation.
Failure to do so could result in serious injury.
SRM-4300
OPERATOR’S MANUAL
GRASS TRIMMER / BRUSHCUTTER
ESPAÑOL
ES
PORTUGUÊS
BR

2
SRM-4300
ECHO Grass Trimmers / Brushcutters are lightweight,
high-performance, petrol engined units designed for
weed control, grass trimming and brush cutting in areas
difficult to control by any other means.
Do not use this unit for any purpose other than
aforementioned.
Never let children operate this unit.
This Manual provides the information necessary for
assembly, operation and maintenance.
You must read this Manual to understand the safe and
effective operation of your ECHO product.
For future reference, you should keep this Operator’s
Manual.
If this Operator’s Manual has become illegible through
impairment or is lost, please purchase a new one from
your ECHO dealer.
When renting or lending this machine to a person who
will operate it, always include this Operator’s Manual,
which provides explanation and instructions.
When transferring a product, please deliver it attaching
the Operator’s Manual.
Specifications, descriptions and illustrative material in
this literature are as accurate as known at the time of
publication, but are subject to change without notice.
Illustrations may include optional equipment and
accessories, and may not include all standard
equipment.
If there is any clause in this Manual that is hard to be
understood, please contact your ECHO dealer.
Contents
Introduction................................................................... 2
Decals and symbols ..................................................... 3
Rules for safe operation................................................ 4
Training ................................................................... 4
Eye protection......................................................... 4
Hearing and ear protection ..................................... 4
Protective clothing................................................... 4
Additional protection ............................................... 4
Using shoulder harness .......................................... 5
Fuel......................................................................... 6
Physical condition ................................................... 6
Area and equipment inspection .............................. 6
General operation ................................................... 7
Vibration and cold ................................................... 9
Repetitive stress injuries......................................... 9
With metal blade ..................................................... 10
Reaction forces ....................................................... 10
Blade selection ....................................................... 11
Description ................................................................... 12
Assembling................................................................... 13
Drive shaft............................................................... 13
Handle .................................................................... 13
Throttle cable .......................................................... 13
Installation of shield ................................................ 13
Installing blade........................................................ 14
Check positions of attached cutting blade .............. 14
Check positions of attached shield ......................... 14
Fuel............................................................................... 15
Fuel......................................................................... 15
Handling fuel........................................................... 15
Operation...................................................................... 16
Starting cold engine................................................ 16
Starting warm engine.............................................. 16
Stopping engine...................................................... 16
Service maintenance guide.......................................... 17
Troubleshooting ............................................................ 17
Maintenance and care ................................................. 18
Cleaning air filter..................................................... 18
Check fuel system................................................... 18
Replacing fuel filter ................................................. 18
Check spark plug .................................................... 18
Cooling system maintenance.................................. 18
Carburettor adjustment ........................................... 19
Cleaning silencer .................................................... 20
Angle transmission.................................................. 20
Lubricating shaft tube (SRM-4300R)..................... 20
Storage......................................................................... 21
Long term storage (over 30 days)........................... 21
Disposal procedure....................................................... 21
Specifications ............................................................... 22
Introduction

3SRM-4300
Decals and symbols
DANGER
This symbol accompanied by the word “DANGER”
calls attentions to an act or a condition which will
lead to serious personal injury or death of
operators and bystanders.
WARNING
This symbol accompanied by the word “WARNING”
calls attentions to an act or a condition which can
lead to serious personal injury or death of
operators and bystanders.
CAUTION
“CAUTION” indicates a potentially hazardous
situation which, if not avoided, may result in minor
or moderate injury.
Circle and slash symbol means whatever is
shown is prohibited.
NOTE
This enclosed message provides tips for use, care
and maintenance of the unit.
Carefully read the Operator’s
Manual
Wear eyes, ears and head
protection
Carburettor adjustment
- Low speed mixture
Purge bulb (Primer)
Petrol and oil mixture
Carburettor adjustment
- High speed mixture
Symbol form / shape Symbol description / application Symbol form / shape Symbol description / application
Emergency stop
Keep bystanders away 15 m
Carburettor adjustment
- Idle speed
Wear gloves
Locate this safety decal on your unit.
The complete unit illustration found in the “Description”
section will help you locate them.
Make sure the decal is legible and that you understand
and follow the instructions on it.
If a decal cannot be read, a new one can be ordered
from your ECHO dealer.
Part number P022-007070
Wear foot protection
Beware of high-temperature
areas

4
SRM-4300
Rules for safe operation
Training
WARNING
Grass trimmers and brushcutters can throw small gravel, stone, glass, metal
or plastic objects as well as the material being cut.
Read these “Rules for safe operation” with care.
Follow instructions in the Operator’s Manual.
Read the Operator’s Manual carefully.
Be thoroughly familiar with the controls and proper use of the unit.
Know how to stop the unit and shut off the engine.
Know how to unhook a harnessed unit quickly.
Never allow anyone to use the unit without proper instruction.
• If you have any questions or problems, please contact your ECHO dealer.
Eye protection
The operator must wear eye protection not only against objects thrown by the unit,
but also because eye infections can be caused by airborne dust, seeds and pollen.
Prescription glasses may be worn under the safety goggles.
Eye protection should also be worn by persons in the risk zone which extends beyond
the danger zone.
Hearing and ear protection
Prolonged exposure to loud noise can cause impairment or loss of hearing.
Wear a suitable hearing protective device such as earmuffs or earplugs to protect
against objectionable or uncomfortable loud noises.
Protective clothing
Choose trousers, shirts and jackets that fit trimly and have no strings, frills or dangling
straps which could catch on the unit or the underbrush.
Do not wear ties, loose clothing or jewellery.
Keep clothing buttoned or zipped up and shirt tails tucked in.
Secure hair so it is above shoulder length.
The wearing of gloves offers some protection against contact with skin irritants such
as poison ivy.
Soft leather work gloves may also improve your grip.
Additional protection
WARNING
In addition to head, eye and ear protection wear protective clothes, safety
gloves and shoes to protect your feet and body from thrown objects, and
improve your footing on slippery surfaces.
Do not wear ties, jewellery, or loose, dangling clothing which could be caught
in the unit.
Do not wear open-toed footwear, or go bare-foot or barelegged.
In certain situations, total face and head protection may be required.
For heavy brush cutting with metal blade, logger’s trousers or leg chaps with
protective inserts are added considerations.
Hay fever (Rhinitis) sufferers may wear disposable masks to help reducing the intake
of allergenic particles.
Operator’s Manual
Do not permit operation
without proper training and
protective equipment
Wear eye protection
Earmuffs Earplugs
1. Hearing protectors
2. Safety goggles
3. Head and face protection
4 Shoulder harness
5. Safety gloves
6. Trim-fitting clothes
7. Sturdy shoes or boots
8. Long trousers
3
4
5
2
6
1
7
8

5SRM-4300
Using shoulder harness
WARNING
• ECHO trimmers and brushcutters are designed to fit a wide variety of body
sizes, but may not be adjustable for extremely tall persons.
Do not use the unit if your feet can reach the cutting attachment when the
unit is attached to the harness.
• In case of an emergency, use detaching button on harness to free yourself
from unit.
NOTE
A person’s size can affect the balancing adjustment.
Also the balancing procedure may not work with some ECHO units on some
persons.
If the procedure does not work for you, please ask your ECHO servicing dealer for
assistance.
The accompanying shoulder harness is suitable for people of standard adult
physique, who are 150 cm - 195 cm in height and 60 cm - 140 cm in waist size.
Use a shoulder harness when provided or when recommended in this Manual.
Adjust both harness and the suspension point on the unit so the unit hangs with the
cutting attachment a few centimetres above ground level.
The cutting attachment and shield should be level in all directions.
Harness the unit on the right side as shown.
Place shoulder harness over the both shoulders and adjust straps so the hook
suspension point rests just below the waist.
Buckle waist belt.
Belt should be snug.
Attach grasstrimmer / brushcutter to harness.
Check for correct adjustment by moving cutting attachment along ground.
Re-adjust position of suspension point if necessary.
a) Choose suspension point up and down lifting hole to find the right balance.
b) Balancing and levelling may require relocation of the clamp and readjustment of
the harness straps.
Also, each type of cutting attachment and shield mounted on the unit may require
balancing.
Balance tool for a level plane
of cutting head rotation
1.Throttle trigger
2.Suspension point
3.Ground level
2
3
1
Choose suspension point
up and down lifting hole, it
until tool head hangs level
just above ground
Lifting hole
Hook
suspension
point
Detaching button
Detaching button
Push

6
SRM-4300
Fuel
Handle fuel with care.
It is highly flammable.
a) Use an appropriate type of fuel container.
b) Do not smoke or bring flame or sparks near to fuel supplies.
c) The fuel tank may be under pressure.
Always loosen the fuel cap and wait for pressure to be equalized before removing
the cap.
d) Fill the fuel tank outdoors over bare ground and install the fuel cap securely.
Do not pour fuel indoors.
e) Wipe any spilled fuel off the unit.
Then move at least 3 m from the fuelling spot before starting the engine.
f) Never refuel while the engine is still hot, or fuel a running engine.
g) Do not store the unit with fuel in its tank, because a fuel leak could start a fire.
Physical condition
You should be in good mental and physical health.
Do not operate if you are under the influence of alcohol or any medication or
substance which could affect your vision, dexterity or judgement.
For your own health and your safe and comfortable work, operate the machine within
the air temperature range of -5°C to 40°C.
Area and equipment inspection
WARNING
• Improper fit will result fly off the cutting attachment.
• Never start the engine if the power transmission shaft is not in place to
prevent the engine from over speeding or the clutch from flying apart.
Inspect the area before using the unit.
Remove objects the unit could throw.
Remember where there are obstructions to be avoided.
Inspect the unit before using it.
Perform only maintenance or adjustments for which the Operator’s Manual gives
instruction.
Do not try to repair the unit without proper instruction.
The unit should be serviced only by trained ECHO dealer servicemen with the proper
tools.
Be sure that:
a) Engine does not leak fuel.
b) Fasteners are tight, and none are missing.
c) Silencer is in good condition.
d) The unit has the proper equipment-shield, handles, harness, etc.-for the cutting
attachment to be used.
e) If used on the unit, the cutting attachment is properly tightened.
Fly off
Do not start engine near
fuelling spot
Do fuelling outdoors
Remove objects grass
trimmers / brushcutters
could throw

7SRM-4300
General operation
WARNING
Eye protection should be considered for everyone in the zone of risk.
Risk of eye injury diminishes with distance.
Do not run the engine indoors, or where there is poor ventilation.
Engine fumes contain deadly poisonous carbon monoxide.
Do not operate with a worn or damaged cutting attachment.
Do not run engine at full throttle without a load.
Do not hit rocks, stones, tree stumps, and other foreign objects with the cutting
attachment.
If cutting attachment strikes an obstruction, stop engine immediately and inspect
cutting attachment for damage.
Lay the unit down on a clear area and set the controls for starting.
Be sure the cutting attachment cannot contact the ground or any obstruction.
Hold the unit firmly down so you will not lose control during starting.
Do not start the unit in the air, or from the harness.
The unit could swing into your leg or an obstruction if you lose control.
Do not raise the cutting attachment above knee height.
If raised higher, the cutting attachment will be more directly in line with your face.
Thrown objects may hit your face and eyes.
Wear the recommended protective gear.
Never operate the unit without the proper guards, shoulder harness and other
protective devices.
Never operate the unit without good visibility and light.
Do not allow anyone to enter the operating DANGER ZONE with you.
The danger zone is an area of 15 m in radius.
Insist that persons in the RISK ZONE beyond the danger zone wear eye protection to
protect them from thrown objects.
If the unit must be used where there are unprotected people, operate at a low throttle
speed to reduce the risk.
Ensure that there are no children, bystanders, and pets in the work area.
Keep all children, bystanders and fellow workers outside 15 m radius for brushcutters
/ grasstrimmers.
Start on ground with cutting
attachment in the clear
15 m
Indoor operation

8
SRM-4300
Stop the engine before leaving the machine, children are not allowed to use the
machine, stop the machine between different working places.
If you are approached, stop the engine and cutting attachment immediately.
Keep your hands and body away from silencer to prevent heat injury while the engine
is hot.
Shut down immediately if the unit starts to shake or vibrate.
A sudden vibration is a sign there may be dangerous trouble, such as a broken
flywheel, clutch or cutting attachment, or loose parts.
Do not use the unit until the problem has been properly diagnosed and corrected.
When the unit is turned off, make sure the cutting attachment stops before the unit is
set down.
A cutting attachment can injure while it continues to spin after the engine is shut off or
throttle control is released.
If the cutting attachment rotates after throttle is returned to idle, carburettor
adjustment is required.
Follow instruction on this Manual to make the adjustment yourself, or have the
carburettor adjusted by your ECHO dealer.
All maintenance and adjustments given in this Manual should be performed by you or
your ECHO servicing dealer on a timely basis.
All required service or repair must be done only by ECHO servicing dealer.
Never attempt to use an incomplete or one fitted with unauthorized modification.
Always use both hands on the handles.
Do not operate one-handed.
Always hold the unit with the fingers and thumbs encircling the handles.
Sudden vibration?
Shut down immediately!
Keep feet and hands away
until rotation stops
Do not operate one-handed

9SRM-4300
Vibration and cold
It is believed that a condition called Raynaud’s Phenomenon which affects the fingers
of certain individuals may be brought about by exposure to vibration and cold.
Exposure to vibration and cold may cause tingling and burning, followed by loss of
colour and numbness in the fingers.
The following precautions are strongly recommended because the minimum exposure
which might trigger the ailment is unknown.
• Keep your body warm, especially the head and neck, feet and ankles, and hands
and wrists.
• Maintain good blood circulation by performing vigorous arm exercises during
frequent work breaks, and also by not smoking.
• Limit the number of hours of operation.
Try to fill each day with jobs where operating the trimmer or other hand-held power
equipment is not required.
• If you experience discomfort redness and swelling of the fingers, followed by
whitening and loss of feeling, consult your physician before exposing yourself further
to cold and vibration.
Repetitive stress injuries
It is believed that over-using the muscles and tendons of the fingers, hands, arms and
shoulders may cause soreness, swelling, numbness, weakness and extreme pain to
the areas just mentioned.
Certain repetitive hand activities may put you at a high risk for developing a repetitive
stress injury (RSI).
To reduce the risk of RSI, do the following:
• Avoid using your wrist in a bent, extended or twisted position.
• Take periodic breaks to minimize repetition and rest your hands.
Reduce the speed and force in which you do the repetitive movement.
• Do exercises to strengthen hand and arm muscles.
• See a doctor if you feel tingling, numbness or pain in your fingers, hands, wrists or
arms.
The sooner RSI is diagnosed, the more likely permanent nerve and muscle damage
can be prevented.
Painful or numb fingers?
See your doctor
immediatelty!

10
SRM-4300
With metal blade
DANGER
Always stop the engine when a cutting attachment jam occurs.
Do not attempt to remove an object causing a jam if the engine is running.
Svere injury can occur if a jam is removed and the cutting attachment
suddenly starts.
WARNING
• Serious injury may result from the improper use of blades.
Read and comply with all safety instructions listed in this Manual.
• The metal blade is designed especially to cut weeds and grass.
To avoid injury due to kickback or blade fracture, do not use the metal blade
to cut brush or trees.
• Use only cutting attachments recommended by ECHO.
• Pieces from a cracked metal blade can fly off during operation.
Inspect metal blades for cracks before each use.
Discard cracked blades no matter how small the crack.
Cracked blades can be the result of misuse or improper sharpening.
• Always use the blade suited for the job.
• Do not hit rocks, stones, tree stumps, and other foreign objects with the blade.
• Do not cut into the ground with the blade.
• If blade strikes an obstruction, stop engine immediately and inspect blade for
damage.
• Do not operate with a dull, bent, fractured or discoloured blade and worn or
damaged nut.
• Do not run engine at full throttle without a load.
• Remove all foreign objects from work area.
• Do not operate brushcutter without shoulder harness and shield.
Scything weeds.
This is cutting by swinging the cutting attachment in a level arc.
It can quickly clear areas of field grass and weeds.
Scything should not be used to cut large, tough weeds or woody growths.
If a sapling or shrub binds the cutting attachment, do not use the cutting attachment
as a lever to free the bind, because this will cause cutting attachment failure.
Instead, shut off the engine and push the sapling or shrub to free the blades.
Do not use a cracked or damaged blade.
Reaction forces
WARNING
Be sure you understand the reaction forces of push and pull, and kickback
described in this Manual, and how these forces may affect your balance in
the operation of a unit.
Push.
The operator may feel the unit push toward him when he tries to cut the object on
right.
If he cannot hold the blade in the cut, a kickback may occur when the blade is pushed
out to where the teeth at the outside furthest point from the operator are cutting.
The blade will “kickback” sideways.
Pull.
The opposite of push.
When object on left, the operator may feel the unit pull away.
Although this pull type of cutting may cause sawdust to be thrown back at the
operator, it is recommended for sawing off heavy brush because the cutting is
smoother and more stable than when the unit pushes.
Kickback.
This may occur when the moving blade at the front of the blade circle contacts strong
brush or trees.
The force that occurs pushes the entire unit and blade violently away in an arc.
Kickback is a danger to a bystander and also a jolting force to the operator.
Inspect blades before use
Use correct blade
Wires can catch and flap
around
Scything weeds
Anticlockwise rotation
Kickback
Push
Pull

11 SRM-4300
Blade selection
WARNING
Use only ECHO approved attachments.
Serious injury may result form the use of a non-approved attachment
combination.
ECHO will not be responsible for the failure of cutting devices, attachments
or accessories which have not been tested and approved by ECHO.
Read and comply with all safety instructions listed in this manual.
The type of blade used must be matched to the type and size of material cut.
An improper or dull blade can cause serious personal injury.
Blades must be sharp.
Dull blades increase the chance of kick-out and injury to yourself and
bystanders.
Plastic grass / weed blade may be used wherever the nylon line head is used.
Do not use this blade for heavy weeds or brush!
8 tooth weed / grass blade is designed for grass, garden debris and thick weeds.
Do not use this blade for brush or heavy woody growth, 2 cm diameter or larger.
80 tooth brush blade is designed for cutting brush and woody growth up to 2 cm
diameter.
22 tooth clearing blade is designed for dense thickets and saplings up to 6.5 cm
diameter.

12
SRM-4300
Description
1. Angle transmission - Having two gears to change
the angle of rotating axis.
2. Shield - Device to protect the operator from
accidental contact with the cutting head and thrown
objects.
3. Shaft tube - Part of the unit that provides a casing
for power transmission shaft.
4. Throttle trigger - Activated by the operator’s finger
for controlling the engine speed.
5. Ignition switch - “Turn Switch” mounted on top of
the Throttle Trigger Housing, turn switch
anticlockwise to RUN, clockwise to STOP position.
6. Throttle trigger lockout - Locks throttle trigger in
the idling position until you have a proper grip with
your right hand around the handle.
7. Safety decal - Part Number P022-007070
8. U-handle - Having the configuration of a bicycle
handle bar.
9. Suspension point - Device on which the harness
can be hooked.
10. Spark plug
11. Air cleaner cover - Covers air filter.
12. Starter handle - Pull handle to start the engine.
13. Fuel tank cap - For closing the fuel tank.
14. Fuel tank - Contains fuel and fuel filter.
15. Silencer cover - Cover the silencer not to make
operator touch to hot surface of silencer.
16. Safety decal - Part Number X505-002310
17. Shouler harness - An adjustable straps to suspend
unit.
18. Hip pad - To protect hip / leg and clothing.
19. Operator’s Manual - Included with unit.
Read before operation and keep for future reference
to learn proper, safe operating techniques.
20. Throttle cable cap
21. Safety goggles
22. Tools - 17 x 19 mm T-wrench (combination
screwdriver / spark plug socket), 8 x 10 mm spanner,
4 mm hexagonal wrench and four bolts (M5 x 20).
19 20 21 22
1
2
3
4
5
6
7
8
910
11
12
13
14
15
16
17
18
P022-007070
X505-002310

13 SRM-4300
Assembling
Drive shaft
1. Stand engine upright on a level surface.
2. Fit drive shaft assembly ensuring that the drive shaft is correctly engaged.
3. Tighten four bolts (M5×20) to fasten drive shaft assembly.
Handle
CAUTION
Install the handle so that it does not hide any of the safety decals.
1. Loosen handle bar support bolts.
2. Locate handle bar in a comfortable operating position and tighten four bolts (M5×25).
Throttle cable
CAUTION
After assembly, adjust the play of wire end on carburettor side to 1 - 2 mm.
As the engine is delivered with throttle cable (engine side) separated, assemble the
cable to carburettor as follows.
1. Loose nut from throttle cable.
2. Insert throttle cable through the bracket as shown.
3. Replace nut finger tight, install the cable cap and attach the inner cable to swivel
on throttle lever.
4. Connect the stop lead.
5. Tighten nut to secure in this position.
6. Check that throttle operates freely and returns to idle position.
Installation of shield
• Be sure to install the shield onto shaft tube before operation.
Operation without shield can lead to serious injury.
• Install the shield as follows.
1. Match tightening boss of angle transmission with shield.
2. Cramp shaft tube with bracket from above and drive two bolts (M6×28) through
into the threaded holes of the shield and tighten the bolts.
3. Install the clog prevention plate with three screws (M5×20).
Four bolts (M5×20)
Four bolts
(M5×25) Handle bar
suppoet
Ground lead
Stop lead
Throttle cable
Nuts
Bracket
Cable cap
Inner cable
Swivel
Wire end
1 - 2 mm
Bracket
Shield
Tightening boss
Three
screws
(M5×20)
Clog
prevention
plate
Angle transmission
Two bolts
(M6×28)
Ground lead

14
SRM-4300
Installing blade
DANGER
If worn nut and retainers for blade are used, there is a danger of blade
getting loose.
Replace them with new ones.
CAUTION
• Fasten output shaft using locking tool securely in order to avoid the
possibility of output shaft rotating when mounting cutting blade which will
prevent the cutting blade fastening nut from being tightened sufficiently.
• Wear gloves to reduce the risk of injury caused by unintentional contact
with the blade.
NOTE
Check to be sure the locking tool is fully engaged to prevent the output shaft from
turning.
Inspect blades before installation.
Check for sharpness.
Dull blades increase the risk of blade kickback reactions.
Small cracks can develop into fractures resulting in a piece of blade flying off during
operation.
Discard cracked blades no matter how small the crack.
Use a locking tool to prevent the output shaft from turning during blade installation.
Install blade retainer, blade, lower blade retainer and nut finger tight.
Tighten the nut (turn anticlockwise) using a socket wrench.
Never fasten while applying your weight.
Otherwise the thread of nut could be broken.
Replace nut and retainers with new ones no matter how small the wear is.
Check positions of attached cutting blade
DANGER
If attached eccentrically, cutting blade is dangerous.
Attach it correctly.
If cutting blade is not correctly attached, it can cause abnormal vibration, injury and
unit failure.
Turn cutting blade with hand to check if cutting blade is in position.
Check positions of attached shield
DANGER
Cutting blade must be inside shield.
Check if cutting blade is inside shield.
If not, correct the position of shield.
Nut
Lower blade retainer
Blade
Blade retainer
Blade retainer
fixing slot
Locking tool
(Hexagonal wrench)
Tightening direction
Socket
wrench
Blade
NutLower blade
retainer
Blade
Blade retainer
Shield
Angle transmission
Blade
Lower blade retainer
Inspect blades
Locking tool
(Hexagonal wrench)

15 SRM-4300
Fuel
Fuel
NOTE
Stored fuel ages.
Do not mix more fuel than you expect to use in thirty (30) days.
Do not mix directly in fuel tank.
• Fuel is a mixture of regular grade petrol and an air-cooled 2-stroke engine oil of
reputable brand name.
Minimum 89 Octane unleaded petrol is recommended.
Do not use fuel containing methyl alcohol or more than 10 % of ethyl alcohol.
• Recommended mixture ratio; 50 : 1 (2 %) for ISO-L-EGD Standard (ISO/CD 13738),
JASO FC, FD grade and ECHO Premium 50 : 1 oil or 25 : 1 (4 %) for JASO FB
grade oil.
- Do not mix directly in engine fuel tank.
- Avoid spilling petrol or oil.
Spilled fuel should always be wiped up.
- Handle petrol with care, it is highly inflammable.
- Always store fuel in approved container.
Handling fuel
DANGER
After refuelling, tighten fuel cap firmly and check for leakage.
In case of fuel leakage, repair before starting operation since there is a
danger of fire.
• Never smoke or allow flame or sparks near fuel.
• Always fill the fuel tank outdoors.
Never pour fuel indoors.
• Always remove the fuel cap slowly to relieve any pressure buildup in the tank.
• Never refuel the engine when it is hot or running.
• Always use an approved, safe fuel container.
• It is not permitted to fill fuel above the shoulder level of fuel tank.
• After fuelling, always wipe away spilled fuel.
• Always move at least 3 m away from the fuelling spot before starting the engine.
• Never store the unit with fuel in the tank a fuel leak could start a fire.
Shoulder level
Fuel tank

16
SRM-4300
Operation
Starting cold engine
WARNING
• When engine starts, the cutting attachment may rotate, even with throttle
trigger in low-speed position.
• When engine is started, confirm if there is not any abnormal vibration or
sound, ask your dealer to repair.
• When starting engine using throttle latch, cutting attachment rotates.
After engine starts, pull throttle trigger slightly to release throttle latch
immediately.
Never use throttle latch for operation.
NOTE
• Check unit for loose nuts, bolts and screws before starting.
• Always clear work area of debris before starting operation.
• Always hold the unit firmly on the ground.
• When pulling starter handle, use short pulls, 1/2 to 2/3 of rope length.
• Do not allow the starter handle to snap back against the housing.
• Before starting engine make sure cutting attachment is not in touch with ground or
other objects.
• Place ignition switch in “START (LATCH)” position.
• Push purge bulb until fuel is visible in clear fuel return line.
• Move choke lever to CLOSE position.
• Pull starter handle until first firing sound is heard.
• Open choke.
• Restart engine, after engine starts, pull throttle trigger slightly to release throttle
latch immediately and allow to warm up.
Starting warm engine
NOTE
If engine does not start after 4 pulls, use cold starting procedure.
• Place ignition switch in “START” position.
• Move choke lever to OPEN position.
• If tank is not empty, pull starter handle.
• If fuel tank is empty, after refilling, push the purge bulb (until fuel is visible in clear
fuel return line).
Pull starter handle.
Stopping engine
WARNING
If engine does not stop, close choke to stall engine.
Have your ECHO dealer inspect and repair ignition switch before using the
unit.
• Release throttle trigger and allow engine to idle.
• Place ignition switch in “STOP” position.
Always disconnect the spark plug cap (ignition cable) from the spark plug to ensure
the engine cannot be started before you work on the unit or leave it unattended.
Starter handle
Fuel return line
Ignition switch
Throttle
trigger
Purge bulb
Spark plug cap
Throttle trigger
lockout
START
(LATCH)
Ignition switch
HIGHT
Throttle
trigger
LOW
Throttle adjuster
Start on ground with cutting
attachment in the clear
Choke lever
RUN START
(LATCH)
Ignition switch
CLOSE (Start)
OPEN (Run)

17 SRM-4300
Trouble
Cause RemedyEngine - hard to start
- does not start
Engine
cranks
Fuel at carburettor No fuel at carburettor • Fuel filter clogged
• Fuel line clogged
• Carburettor
• Clean or replace
• Clean
• Ask your ECHO dealer
Fuel at cylinder No fuel at cylinder • Carburettor • Ask your ECHO dealer
Silencer wet with fuel • Fuel mixture is too rich • Open choke
• Clean / replace air filter
• Adjust carburettor
• Ask your ECHO dealer
Spark at end of
plug wire
No spark at end of plug
wire
• Ignition switch off
• Electrical problem
• Turn switch on
• Ask your ECHO dealer
Spark at plug No spark at plug • Spark gap incorrect
• Covered with carbon
• Fouled with fuel
• Spark plug defective
• Adjust 0.6 to 0.7 mm
• Clean or replace
• Clean or replace
• Replace plug
Engine does
not crank
• Internal engine problem • Ask your ECHO dealer
Engine runs Dies or accelerates poorly • Air filter dirty
• Fuel filter dirty
• Fuel vent plugged
• Spark plug
• Carburettor
• Cooling system plugged
• Exhaust port / silencer
plugged
• Clean or replace
• Clean or replace
• Clean
• Clean and adjust / replace
• Adjust
• Clean
• Clean
Troubleshooting
WARNING
• All trimmer service operations, other than items listed in the Operator’s Manual, should be performed by
competent service personnel.
• Fuel vapors are extremely flammable and may cause fire and / or explosion.
Never test for ignition spark by grounding spark plug near cylinder plug hole, otherwise serious
personal injury may result.
Service maintenance guide
IMPORTANT
Time intervals are maximum.
Actual use and your experience will determine the frequency of required maintenance.
* Or 50 hours, whichever occurs first.
Area Maintenance Page Before use Monthly
Air Filter Clean / Replace 18 •
Fuel System Inspect 18 •
Fuel Filter Inspect / Clean / Replace 18 •
Spark Plug Inspect / Cl ean / Adjust / Replace 18 •
Cooling System Inspect / Clean 18 •
Carburettor Adjust / Replace and adjust 19 •
Silencer Inspect / Tighten / Clean 20 •
Angle Transmission Grease 20 •*
Shaft Tube (SRM-4300R) Oil 20 •*
Starter Rope Inspect / Replace - •
Screws, Bolts and Nuts Inspect, Tighten / Replace - •

18
SRM-4300
Maintenance and care
• If you have any questions or problems, please contact your ECHO dealer.
Cleaning air filter
NOTE
If filter is excessive dirty or no longer fits properly, replace it.
• Close choke.
Release the cleaner cover latch, and remove air cleaner cover.
• Remove air filter.
• Brush off dust lightly, or wash them in a non-inflammable solvent if necessary, or
replace the air filters.
Do not wash the felt air filter.
• Dry them completely before installation.
• Reinstall air filters and cover, and engage latch.
Check fuel system
• Check before every use.
• After refuelling, make sure fuel does not leak or exude from around fuel pipe, fuel
grommet or fuel tank cap.
• In case of fuel leakage or exudation there is a danger of fire.
Stop using the machine immediately and request your dealer to inspect or replace.
Replacing fuel filter
• Use a piece of steel wire or the like to pick up fuel filter through fuel tank opening.
• Pull old filter from fuel line.
• Install new fuel filter.
Check spark plug
• Check plug gap.
Correct gap is 0.6 to 0.7 mm.
• Inspect electrode for wear.
• Inspect insulator for oil or other deposits.
• Replace plug if needed and tighten to 15 - 17 N•m (150 to 170 kgf•cm).
Cooling system maintenance
IMPORTANT
To maintain proper engine operating temperature, cooling air must pass
freely through the cylinder fin area.
This flow of air carries combustion heat away from the engine.
Overheating and engine seizure can occur when:
• Air intakes are blocked, preventing cooling air from reaching the cylinder,
or
• Dust and grass build up on the out side of the cylinder.
This build-up insulates the engine and prevents the heat from leaving.
Removal of cooling passage blockages or cleaning of cylinder fins is
considered “Normal Maintenance”.
Any resultant failure attributed to lack of maintenance is not warranted.
• Remove dust and dirt from between fins.
• Before each use, remove accumulated debris from bottom engine intake grille
located between the fuel tank and starter.
Air filters
Air cleaner cover
Fuel filter
Fuel line
Air intake
0.6 to 0.7 mm
Cylinder fins
Cleaner cover latch
Felt air filter

19 SRM-4300
Carburettor adjustment
CAUTION
Cutting attachment must not turn when unit is idling.
Every unit is test run at the factory and the carburettor is fine tuned for maximum
performance.
Any change from this setting should be performed only with the aid of an accurate
tachometer (see Specification for r/min setting).
If carburettor adjustment is performed without a tachometer, only the Basic Setting
adjustment is recommended.
Before adjusting carburettor, clean or replace air filter, start engine and run several
minutes to bring it to operating temperature.
Idle speed adjustment
Turn idle speed adjuster clockwise until cutting attachment begins to turn, then turn
screw out anticlockwise until cutting attachment stops turning.
Turn screw out, anticlockwise, and additional 1/4 turn.
Basic setting
NOTE
DO NOT over tighten (L) / (H) adjusters.
Forcing them to tighten will damage the carburettor.
1. Stop engine and turn both low (L) and high (H) speed mixture adjusters in,
clockwise until they stop and are lightly seated.
2. Turn low speed mixture adjuster (L) out, anticlockwise 1 and 1/2 turn.
Fine tuning
(Requires Accurate Tachometer)
1. Start engine and allow to run at high idle until warm.
2. Adjust idle speed if necessary (2500 to 3000 r/min).
3. Always begin fine tuning with low speed mixture adjuster (L).
4. Slowly turn (L) adjuster clockwise, try to reach maximum idle speed.
5. Turn (L) adjuster anticlockwise 1/8 to 1/4 turn.
6. Turn idle speed adjuster clockwise until cutting attachment begins to turn.
7. Turn idle speed adjuster anticlockwise 1/2 turn or until cutting attachment stops.
High speed adjustment
NOTE
• Improper high speed mixture adjustment can result in lean operation and
consequent severe engine damage.
• Do not run engine on full throttle longer than 5 to 6 seconds during high speed
mixture adjuster (H) adjustment to avoid damage to engine.
• The engine will overheat when the high speed mixture adjuster (H) is adjusted to
the lean condition reducing engine life.
1. While engine running at full throttle, turn (H) adjuster slowly clockwise until engine
runs smoothly under no load.
2. Turn (H) adjuster anticlockwise 1/8 turn to obtain optimum fuel for full power under
the load conditions.
3. After the high speed adjustment has been completed, and should the engine
hesitate during acceleration from idle to full throttle, turn (H) adjuster anticlockwise
until smooth acceleration is obtained.
Make sure that the final engine speed does not exceed 11000 r/min.
T: Idle speed adjuster
L: Low speed
mixture adjuster
H: High speed
mixture adjuster

20
SRM-4300
Two bolts
Silencer cover
Silencer
Cleaning silencer
• Clean deposits from silencer and tighten two bolts.
Angle transmission
NOTE
Use good quality lithium multi grease.
• Remove the plug and drain screw from the angle transmission.
• Add grease into the transmission until old grease is pushed out.
If necessary, use a low pressure pump.
• Reinstall the drain screw and plug.
Lubricating shaft tube (SRM-4300R)
• Remove screw from shaft tube housing.
• Add machine oil.
• Reinstall screw.
Plug (Bolt)
Angle transmission
Screw
Drain
screw