Shindaiwa 340s User manual

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© 10/23 ECHO Incorporated
Operator’s
Manual
340s
Chainsaw
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth defects,
or other reproductive harm.
Read and understand all provided literature before
use. Failure to do so could result in serious injury.
Note: This product complies with CAN ICES-2/NMB-2.

TABLE OF CONTENTS 340S
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TABLE OF CONTENTS
Introduction................................................................................................................. 3
Servicing Information.................................................................................................. 3
Parts and Serial Number.................................................................................... 3
Service ............................................................................................................... 4
Consumer Product Support................................................................................ 4
Product Registration........................................................................................... 4
Additional Literature ........................................................................................... 4
Safety ......................................................................................................................... 5
Manual Safety Symbols and Important Information ........................................... 5
International Symbols......................................................................................... 6
Personal Condition and Safety Equipment ........................................................ 8
Rules for Safe Operation.................................................................................. 12
Correct Use of Chain Brake ............................................................................. 13
Emission Control .(Exhaust & Evaporative) ............................................................ 19
CARB and EPA Emissions Control Information................................................ 19
Description ............................................................................................................... 20
Contents................................................................................................................... 22
Assembly.................................................................................................................. 22
Preparation for Use .......................................................................................... 22
Operation.................................................................................................................. 26
Fuel .................................................................................................................. 26
Chain Lubricant ................................................................................................ 29
Winter Operation .............................................................................................. 30
Starting Cold Engine ........................................................................................ 30
Starting Warm Engine ...................................................................................... 32
Running............................................................................................................ 34
Stopping ........................................................................................................... 35
Checking Chain Tension .................................................................................. 35
Chain Lubrication Test...................................................................................... 35
Cutting Instructions .......................................................................................... 36
Guide Bar and Chain Combination .................................................................. 40
Kick GuardTM ................................................................................................... 41
Guide Bar ......................................................................................................... 41
Saw Chain........................................................................................................ 41
Maintenance............................................................................................................. 42
Skill Levels ....................................................................................................... 42
Maintenance Intervals ...................................................................................... 43
Carburetor Adjustment ..................................................................................... 44
Air Filter............................................................................................................ 46
Spark Plug........................................................................................................ 46
Check Fuel System .......................................................................................... 46
Fuel Filter ......................................................................................................... 47
Oil Filter............................................................................................................ 47
Guide Bar ......................................................................................................... 48
Sprocket ........................................................................................................... 48
Cooling System Cleaning................................................................................. 49
Spark Arrester Muffler ...................................................................................... 49
Spark Arrester Screen...................................................................................... 50
Exhaust Port Cleaning ..................................................................................... 50
Setting the Saw Chain...................................................................................... 51
Troubleshooting........................................................................................................ 54
Storage..................................................................................................................... 56
Storage After Use............................................................................................. 56
Specifications ........................................................................................................... 57
Product Registration................................................................................................. 58

340S INTRODUCTION
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INTRODUCTION
Specifications, descriptions, and illustrative material in this literature are as
accurate as possible. Specifications are subject to change without notice.
Illustrations might include optional equipment and accessories, and might
not include all standard equipment. Your equipment might appear slightly
different than pictured equipment.
Read and understand all provided literature.
Literature contains specifications and
information for safety, operation,
maintenance, storage, and assembly
specific to this product. Scan QR codes for
more information.
For additional literature, including safety manuals where applicable, or
questions regarding terms used in this manual, visit:
https://www.echo-usa.com/manuals
OR
https://www.shindaiwa-usa.com/manuals
SERVICING INFORMATION
Parts and Serial Number
Genuine Shindaiwa Parts and
Assemblies for your Shindaiwa
products are available only from an
Authorized Shindaiwa Dealer. When
you do need to buy parts always
have the Model Number and Serial
Number of the unit with you. For
future reference, write them in the
space provided below.
Model No. _____________________ Serial No. _____________________

SERVICING INFORMATION 340S
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Service
Service of this product during the warranty period must be performed by an
Authorized Shindaiwa Service Dealer. For the name and address of the
Authorized Shindaiwa Service Dealer nearest you, ask your retailer or call:
1-877-986-7783. Dealer information is also available on www.shindaiwa-
usa.com. When presenting your unit for Warranty service/repairs, proof of
purchase is required.
Consumer Product Support
If you require assistance or have questions concerning the application,
operation or maintenance of this product you may call the Shindaiwa
Consumer Product Support Department at 1-877-986-7783 from 8:00 am to
5:00 pm (Central Standard Time) Monday through Friday. Before calling,
please know the model and serial number of your unit.
Product Registration
To ensure trouble free warranty coverage it is important that you register
your Shindaiwa equipment on-line at www.shindaiwa-usa.com or by filling
out the product registration sheet included in this manual. Registering your
product confirms your warranty coverage and provides a direct link between
you and ECHO if we find it necessary to contact you.
Additional Literature
In addition to finding information online, information is available from your
Authorized Shindaiwa Service Dealer, or by contacting ECHO Incorporated,
400 Oakwood Road, Lake Zurich, IL 60047, 1-800-432-ECHO (3246).

340S SAFETY
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SAFETY
Manual Safety Symbols and Important Information
Throughout this manual and on the product itself, you will find safety alerts
and helpful, informational messages preceded by symbols or key words.
The following is an explanation of those symbols and key words and what
they mean to you.
The safety alert symbol accompanied by the word “DANGER”
calls attention to an act or condition which WILL lead to serious
personal injury or death if not avoided.
The safety alert symbol accompanied by the word “WARNING”
calls attention to an act or condition which CAN lead to serious
personal injury or death if not avoided.
The safety alert symbol accompanied by the word “CAUTION”
calls attention to an act or condition which might lead to minor
or moderate personal injury if not avoided.
The enclosed message provides information necessary for the
protection of the unit.
Note: This enclosed message provides tips for use, care and
maintenance of the unit.
CIRCLE AND SLASH SYMBOL
This symbol means the specific action shown is prohibited.
Ignoring these prohibitions can result in serious or fatal injury.

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International Symbols
Symbol Description Symbol Description
WARNING!
Read and follow
all safety
precautions in
the instruction
manual. Failure
to follow
instructions
could result in
serious personal
injury.
Carburetor
Adjustment -
High Speed
Mixture
Wear Eye, Ear,
and Head
Protection.
Carburetor
Adjustment -
Idle Speed
Tip contact may
cause the guide
bar to move
suddenly upward
and backward,
which may cause
serious injury.
Carburetor
Adjustment -
Low Speed
Mixture
Contact of the
guide bar tip with
any object
should be
avoided.
Measured
maximum
kickback value,
without brake,
for approved
bar and chain
combinations.
Both of the
operator’s hands
must be used to
operate the
chainsaw.
Fuel and Oil
Mixture
Hot Surface Chain Oil Fill
H
T
L

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Note: Not all symbols will appear on your unit.
Chain Brake
Operation
Chain Oiler
Adjustment
Choke Control
“COLD START”
Position (Choke
Closed)
Choke Control
“RUN” Position
(Choke Open)
Purge Bulb
Decompression
Device
STOP /
Momentary
STOP Switch
Symbol Description Symbol Description
STOP
STOP

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Personal Condition and Safety Equipment
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
The muffler or catalytic muffler and surrounding cover
may become extremely hot. Always keep clear of
exhaust and muffler area, otherwise serious personal
injury might occur.
Users of this product risk injury to themselves and others if the
unit is used improperly and/or safety precautions are not
followed. Proper clothing and safety gear must be worn when
operating unit.
Physical Condition
Your judgment and physical dexterity may not be good:
• If you are tired or sick
• If you are taking medication
• If you have taken alcohol or drugs
Operate unit only if you are physically and mentally well.
Eye Protection
◆Eye protection that meets ANSI Z87.1 or CE requirements
must be worn whenever you operate the unit.
◆For additional safety, a full-face shield can be worn over
safety glasses or goggles to provide protection from sharp
branches or flying debris.

340S SAFETY
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Hand Protection
Wear sturdy, no-slip, rubber work gloves to improve your grip on the
handles. Gloves also provide protection against cuts and scratches, cold
environments, and reduce the transmission of machine vibration to your
hands.
Hearing and Ear Protection
ECHO recommends wearing personal protective equipment whenever unit
is used.
Breathing Protection
Operators who are sensitive to dust or other common airborne allergens
may need to wear a dust mask to prevent inhaling these materials while
operating unit. Dust masks can provide protection against dust, plant debris,
and other plant matter such as pollen. Make sure the mask does not impair
your vision, and replace the mask as needed to prevent air restrictions.
Proper Clothing
Wear snug-fitting, durable clothing:
• Pants should have long legs, shirts should have long sleeves.
• DO NOT WEAR SHORTS.
• DO NOT WEAR TIES, SCARVES, JEWELRY, or clothing with loose or
hanging items that could become entangled in moving parts or
surrounding growth.
• Keep clothing buttoned or zipped, and keep shirt tails tucked in.
• Wear sturdy work shoes with nonskid rubber soles.
• DO NOT WEAR OPEN TOED SHOES.
• DO NOT OPERATE UNIT WITH BARE FEET.
Keep long hair away from engine and air intake. Retain hair with cap or net.
Heavy protective clothing can increase operator fatigue, which may lead to
heat stroke. Schedule heavy work for early morning or late afternoon hours
when temperatures are cooler.

SAFETY 340S
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The components of this machine generate an electromagnetic
field during operation, which can interfere with some
pacemakers. To reduce the risk of serious or fatal injury,
persons with pacemakers should consult with their physician
and the pacemaker manufacturer before operating this
machine. In the absence of such information, ECHO does not
recommend the use of this machine by anyone who has a
pacemaker.
Extended Operation and Extreme Conditions
Prolonged exposure to cold and/or vibration can result in injury.
Read and follow all safety and operation instructions to
minimize risk of injury. Failure to follow instructions can result
in painful wrist/hand/arm injuries.
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 sensations, followed by loss of color 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, neck, feet, ankles, hands, and
wrists.
• Maintain good blood circulation by performing vigorous arm exercises
during frequent work breaks, and also by not smoking.
• Limit the hours of operation. Try to fill each day with jobs where operating
the unit 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
further exposing yourself to cold and vibration.

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Repetitive Stress Injuries (RSI)
It is believed that overusing the muscles and tendons of the fingers, hands,
arms, and shoulders may cause soreness, swelling, numbness, weakness,
and extreme pain in those areas. Certain repetitive hand activities may put
you at a high risk for developing a Repetitive Stress Injury (RSI). An
extreme RSI condition is Carpal Tunnel Syndrome (CTS), which could occur
when your wrist swells and squeezes a vital nerve that runs through the
area. Some believe that prolonged exposure to vibration may contribute to
CTS. CTS can cause severe pain for months or even years.
To reduce the risk of RSI/CTS, do
the following
• Avoid using your wrist in a bent,
extended, or twisted position.
Instead try to maintain a straight
wrist position. Also, when
grasping, use your whole hand,
not just the thumb and index
finger.
• Take periodic breaks to minimize
repetition and rest your hands.
• Reduce the speed and force with
which you do the repetitive
movement.
• Do exercises to strengthen the
hand and arm muscles.
• Immediately stop using all power equipment and consult a doctor if you
feel tingling, numbness, or pain in the fingers, hands, wrists, or arms. The
sooner RSI/CTS is diagnosed, the more likely permanent nerve and
muscle damage can be prevented.
All over head electrical conductors and communications wires
can have electricity flow with high voltages. This unit is not
insulated against electrical current. Never touch wires directly
or indirectly, otherwise serious injury or death can result.
Do not operate this product indoors or in inadequately
ventilated areas. Engine exhaust contains poisonous emissions
and can cause serious injury or death.

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Rules for Safe Operation
Kickback Safety Precautions for Chainsaw Users
KICKBACK may occur when the nose or tip of the guide bar
touches an object, or when the wood closes in and pinches the
saw chain in the cut.
Tip contact in some cases may
cause a lightning fast reverse
REACTION, kicking the guide bar
up and back towards the operator.
Pinching the saw chain along the
top of the guide bar may push the
guide bar rapidly back towards the
operator. Either of these reactions
may cause you to lose control of the
saw which could result in serious
personal injury.
The optional Kick GuardTM device is
not installed on the guide bar when
you purchase your chainsaw. The
optional Kick Guard can be used in
a majority of cutting operations, and
is especially recommended for
beginners, homeowners, or
chainsaw novices. Most cutting
operations can be accomplished
with the optional Kick Guard in
place.
Do not rely exclusively upon the safety devices built into your saw. As a
chainsaw user, you should take several steps to keep your cutting jobs free
from accident or injury.
1. With a basic understanding of
kickback, you can reduce or
eliminate the element of
surprise. Sudden surprise
contributes to accidents.
Rotational kickback
Rotational kickback
Chain moving downward at impact
Kickback Danger Zone

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2. Keep a good firm grip on the saw with both hands, the right hand on the
rear handle, and the left hand on the front handle, when the engine is
running. Use a firm grip with thumbs and fingers encircling the
chainsaw handles. A firm grip will help you reduce kickback and
maintain control of the saw. Don’t let go.
3. Make sure that the area in
which you are cutting is free
from obstructions. Do not let
the nose of the guide bar
contact a log, branch, or any
other obstruction which could
be hit while you are operating
the saw.
4. Cut at high engine speeds.
5. Do not overreach or cut above shoulder height.
6. Follow manufacturer’s sharpening and maintenance instructions for the
saw chain.
7. Only use replacement bars and chains specified by the manufacturer or
the equivalent.
Correct Use of Chain Brake
Chain Brake Operation
• Set the lever in the unlocked
position before starting to cut.
• If the brake is tripped by kickback
reaction, the chain will stop
immediately. Release the throttle
to avoid possible damage to the
engine or clutch.
• Do not attempt to operate the
engine with the brake locked.
Linear kickback
Kickback
Pinch
Unlocked
Locked

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Testing the Brake
• Start the engine on a solid level surface and run at a fast idle until warm.
• Hold the saw firmly by the handles and accelerate the engine to a fast
idle.
• Slowly operate the chain brake lever while holding the saw firmly on the
ground. When the brake lever trips, the chain should stop. Immediately
release the throttle trigger.
Do not allow the saw to tip forward in order to avoid damage to the
chain.
If the chain does not stop immediately, return the saw to your
authorized dealer for repair.
Note:
• For practice, while cutting a small tree, push the lever forward to lock
the brake.
• Confirm that the brake works properly before each use.
• If the chain brake is clogged with wood chips, function of the brake may
deteriorate. Always keep the device clean.
• Do not increase engine RPM while the chain brake is locked.
Do not use a bar and chain combination other than those specified in this
manual.
For your own safety, do not remove the chain brake system.
The installation of a chain brake may be mandatory by law or as stipulated
by insurance regulations in your area of operation. You should inquire
through local government offices, your employer or your local dealer to
ensure that your chainsaw conforms to the required safety standard.
Chain brakes have been designed and tested to comply with international
safety standards as follows:
USA: ANSI Standard B175.1 Safety Requirement for chainsaws
Canada: CSA Standard Z62.1, Z62.3

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ANSI Standard B175.1 and
CSA Z62.1.3 stipulate that the
brake shall stop the chain
0.12 seconds at an engine
speed of 13,500 RPM. It is the
responsibility of the owner/
operator to ensure that the
brake is serviced, adjusted
and tested strictly in
accordance with the
instructions as detailed here
in order to ensure that the
brake performance is
maintained in compliance with
the Standards B175.1 and CSA
Z62.1.3.
Automatic Chain Brake
Kickback produced from the tip of the guide bar will trip the automatic chain
brake. To make sure that the automatic chain brake operates properly,
follow these steps:
1. Stop the engine.
2. Hold the saw with the guide bar approximately 35 cm (14 in.) above a
wooden surface. Right hand should hold the rear handle, and left hand
should hold the front handle.
3. Release the front handle and drop the end of the guide bar against the
wooden surface.
4. The impact should lock the chain brake.
35 cm
(14 in.)

SAFETY 340S
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When checking the operation of the automatic chain brake, use a soft
surface substance like wood to absorb the impact so the chain is not
damaged.
Other Safety Precautions
1. Do not operate a chainsaw with one hand! Serious injury to the
operator, helpers, bystanders, or any combination of these persons
may result from one-handed operation. A chainsaw is intended for two-
handed use.
2. Do not operate a chainsaw when you are fatigued.
3. Use safety footwear, snug-fitting clothing and protective gloves. Wear
eye, hearing, and head protection devices.
4. Use caution when handling fuel. Mix and pour fuel outdoors where
there are no sparks and flames. Slowly remove the fuel cap only after
stopping the engine and allowing the chain saw to cool. Do not smoke
while fueling or mixing fuel. Move the chainsaw at least 10 feet (3 m)
from the fueling point before starting the engine.
5. Do not allow other persons to be near the chainsaw when starting or
cutting with the chainsaw. Keep bystanders and animals out of the work
area.
6. Do not start cutting until you have a clear work area, secure footing,
and a planned retreat path from the falling tree.
7. Keep all parts of your body away from the saw chain when the engine is
running.
8. Before you start the engine, make sure that the saw chain is not
contacting anything.
9. Carry the chainsaw with the engine stopped, the guide bar and saw
chain to the rear, and the muffler away from your body.
10. Do not operate a chainsaw that is damaged, improperly adjusted, or not
completely and securely assembled. Be sure that the saw chain stops
moving when the throttle control trigger is released.
11. Shut off the engine before setting the chainsaw down.
12. Use extreme caution when cutting small size brush and saplings
because slender material may catch the saw chain and be whipped
toward you or pull you off balance.
13. When cutting a limb that is under tension, be alert for spring-back so
that you will not be struck when the tension in the wood fibers is
released.
14. Keep the handles dry, clean, and free of oil or fuel mixture.
15. Operate the chainsaw only in well ventilated areas.

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16. Do not operate a chainsaw in a tree unless you have been specifically
trained to do so.
17. All chainsaw service, other than items listed in the operator’s manual
maintenance instructions, should be performed by competent service
personnel. For example, if improper tools are used to remove the
flywheel or if an improper tool is used to hold the flywheel in order to
remove the clutch, structural damage to the flywheel could occur and
could subsequently cause the flywheel to burst.
18. When transporting your chainsaw, use the appropriate guide bar cover.
19. A spark arrester muffler approved to SAE Standard J335 is standard on
this chainsaw to reduce the possibility of forest fires. Do not operate the
chainsaw with a loose or defective muffler. Do not remove the spark
arrester screen.
20. When using a chainsaw a fire extinguisher should be available.
21. When felling, keep at least two tree lengths between yourself and your
fellow workers.
22. Follow instructions in your operator’s manual for starting the chainsaw.
23. Never adjust the guide bar or saw chain with the engine operating.
24. When boring with the chainsaw, the initial cut should be introduced with
the lower part of the nose (tip) until the hole is sufficiently large so as to
introduce the entire nose (tip) of the guide bar. This technique should
reduce the danger of kickback.
25. Allow your chainsaw to cool before refueling, and do not smoke while
refueling.
Chainsaws shall be used in accordance with the operating
instructions and safety precautions listed in the operator's
manual(s). It shall be the responsibility of the owner to see that
such instructions and precautions are given to every operator
who uses the saw.
During operation, the muffler or catalytic muffler and
surrounding cover become hot.
Never suspend the saw on a lanyard with the engine
running.
Always use the saw from the right-hand side of your body –
NEVER from the left side.
Always wear proper safety clothing to protect your lower
body from sharp saw chain and hot muffler.

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Always keep exhaust area clear of flammable debris during
transportation or when storing, otherwise serious property
damage or personal injury may result.
Moving parts can amputate fingers or cause severe injuries.
Keep hands, clothing and loose objects away from all openings.
ALWAYS stop engine, disconnect spark plug, and make
sure all moving parts have come to a complete stop before
removing obstructions, clearing debris, or servicing unit.
DO NOT start or operate unit unless all guards and
protective covers are properly assembled to unit.
NEVER reach into any opening while the engine is running.
Moving parts may not be visible through openings.
Using improper replacement components or removing safety
devices may result in serious or fatal injury.
Unit includes safety devices that reduce the likelihood of
kickback:
◆Chain brake - brake actuated by kickback energy, not
manual activation.
◆Reduced-kickback guide bar - reduced nose radius guide
bar.
◆Low-kickback saw chain - saw chain that meets ANSI
kickback performance requirements when configured with
the bar/chain recommendations in this manual.
◆Front hand guard - a structural barrier between the front
handle of a chainsaw and the guide bar.
Periodically check fuel system (fuel lines, vent, grommet, fuel
tank, and fuel cap) for leaks especially if the unit is dropped. If
damage or leaks are found, do not use unit, otherwise serious
personal injury or property damage may occur. Have unit
repaired by an authorized servicing dealer before using.

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EMISSION CONTROL (EXHAUST &
EVAPORATIVE)
CARB and EPA Emissions Control Information
The emission control system for
the engine is EM (engine
modification) and, if the second to
last character of the Engine Family
on the Emission Control
Information label (sample below) is
“B”, “C”, “K”, or “T”, the emission
control system is EM and TWC
(3-way catalyst). The fuel tank/fuel
line emission control system is EVAP (evaporative emissions). Evaporative
emissions for California models are only applicable to fuel tanks and fuel
feed lines.
An Emission Control Label is
located on the engine. (This is an
EXAMPLE ONLY, information on
label varies by engine FAMILY).
Product Emission Durability (Emission Compliance Period)
The 50 or 300 hour emission compliance period is the time span selected by
the manufacturer certifying the engine emissions output meets applicable
emissions regulations, provided that approved maintenance procedures are
followed as listed in the Maintenance Section of this manual.

DESCRIPTION 340S
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DESCRIPTION
Locate the safety decal(s) or etching(s) on your unit. Make sure they are
legible, and that you understand and follow the instructions. If any cannot be
read, replacements can be ordered from your Shindaiwa dealer. Images
shown below are for example only. Those on your unit might appear slightly
different.
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