Shindaiwa 402S-18 User manual

X7503256302
© 09/19 ECHO Incorporated
Operator’s
Manual
402s
Chain Saw
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.

X7503256302
© 09/19 ECHO Incorporated
TABLE OF CONTENTS
Introduction ................................................................................................. 4
Servicing Information .................................................................................. 4
Parts/Serial Number............................................................................. 4
Service................................................................................................. 5
Consumer Product Support ................................................................. 5
Product Registration ............................................................................ 5
Additional Literature............................................................................. 5
Packing List................................................................................................. 5
Safety.......................................................................................................... 6
Rules For Safe Operation .................................................................... 6
Correct Use Of Chain Brake ................................................................ 7
Personal Condition and Safety Equipment ........................................ 12
International Symbols ........................................................................ 16
Manual Safety Symbols and Important Information........................... 17
(Exhaust & Evaporative) ........................................................................... 19
CARB And EPA Emissions Control Information ................................ 19
Description ................................................................................................ 20
Preparation For Use........................................................................... 22
Operation .................................................................................................. 26
Fuel.................................................................................................... 26
Chain Lubricant.................................................................................. 29
Winter Operation................................................................................ 30
Starting Cold Engine.......................................................................... 30
Starting Warm Engine........................................................................ 32
Running ............................................................................................. 33
Stopping............................................................................................. 34
Checking Chain Tension.................................................................... 35
Chain Lubrication Test....................................................................... 35
Cutting Instructions ............................................................................ 35
Chain And Guide Bar Combination.................................................... 40
Guide Bar........................................................................................... 40
Saw Chain ......................................................................................... 41

402S TABLE OF CONTENTS
X7503256302 3
© 09/19 ECHO Incorporated
Maintenance ............................................................................................. 42
Skill Levels ........................................................................................ 42
Maintenance Intervals ....................................................................... 43
Carburetor Adjustment ...................................................................... 44
Air Filter ............................................................................................. 45
Spark Plug......................................................................................... 45
Check Fuel System ........................................................................... 46
Fuel Filter .......................................................................................... 46
Automatic Oiler.................................................................................. 47
Oil Filter ............................................................................................. 47
Guide Bar .......................................................................................... 47
Sprocket ............................................................................................ 48
Cooling System Cleaning .................................................................. 48
Spark Arrestor Muffler ....................................................................... 48
Spark Arrestor Screen....................................................................... 49
Exhaust Port Cleaning....................................................................... 49
Setting The Saw Chain...................................................................... 50
Troubleshooting........................................................................................ 53
Storage ..................................................................................................... 55
Storage After Use.............................................................................. 55
Specifications ........................................................................................... 56
Product Registration ................................................................................. 58

INTRODUCTION 402S
4 X7503256302
© 09/19 ECHO Incorporated
INTRODUCTION
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.
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/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.
You can find these numbers on the
engine housing. For future reference,
write them in the space provided below.
Model No. _________________ Serial No. _________________

402S PACKING LIST
X7503256302 5
© 09/19 ECHO Incorporated
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 Inc., 400
Oakwood Road, Lake Zurich, IL 60047 (1-800-432-ECHO (3246)).
PACKING LIST
The ECHO product you purchased has been factory pre-assembled for your
convenience. Due to packaging restrictions, some assembly may be
necessary.
After opening the carton, check for damage. Immediately notify your retailer
or ECHO Dealer of damaged or missing parts. Use the contents list to check
for missing parts.
1 Power Head
1 Operator's Manual
1 Warranty Statement
1 Guide Bar
1 Saw Chain

SAFETY 402S
6 X7503256302
© 09/19 ECHO Incorporated
SAFETY
Rules For Safe Operation
Kickback Safety Precautions for Chain Saw 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 chain saw. The
optional Kick GuardTM can be used in
a majority of cutting operations, and is
especially recommended for
beginners, homeowners, or chain saw
novices. Most cutting operations can
be accomplished with the optional
Kick GuardTM in place.
Do not rely exclusively upon the safety devices built into your saw. As a
chain saw 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

402S SAFETY
X7503256302 7
© 09/19 ECHO Incorporated
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 chain
saw 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.
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.
Linear kickback
Kickback
Pinch
Locked
Shown with optional
Kick GuardTM
Unlocked
Shown with optional
Kick GuardTM

SAFETY 402S
8 X7503256302
© 09/19 ECHO Incorporated
• 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 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 chain saw 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 chain saws
Canada: CSA Standard Z62.1, Z62.3

402S SAFETY
X7503256302 9
© 09/19 ECHO Incorporated
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 r/min. 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 inches) 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.
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.
35 cm
(14 in.)

SAFETY 402S
10 X7503256302
© 09/19 ECHO Incorporated
Other Safety Precautions
1. Do not operate a chain saw with one hand! Serious injury to the
operator, helpers, bystanders, or any combination of these persons
may result from one-handed operation. A chain saw is intended for two-
handed use.
2. Do not operate a chain saw 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. Move the chain saw at least 3 m (10
feet) from the fueling point before starting the engine.
5. Do not allow other persons to be near the chain saw when starting or
cutting with the chain saw. 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 chain saw 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 chain saw 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.
16. Do not operate a chainsaw in a tree unless you have been specifically
trained to do so.
17. All chain saw service, other than items listed in the Instruction 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.)

402S SAFETY
X7503256302 11
© 09/19 ECHO Incorporated
18. When transporting your chain saw, use the appropriate guide bar
scabbard.
19. A spark arrestor muffler approved to SAE Standard J335 is standard on
this chain saw to reduce the possibility of forest fires. Do not operate
the chain saw with a loose or defective muffler. Do not remove the
spark arrestor screen.
20. When using a chainsaw a fire extinguisher should be available.
21. When felling, keep at least 2 tree lengths between yourself and your
fellow workers.
22. Follow instructions in your operator’s manual for starting the chain saw.
23. Never adjust the guide bar or sawchain when 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.
Chain saws 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.
◆Always keep exhaust area clear of flammable debris during
transportation or when storing, otherwise serious property
damage or personal injury may result.

SAFETY 402S
12 X7503256302
© 09/19 ECHO Incorporated
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.
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.
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 may occur.

402S SAFETY
X7503256302 13
© 09/19 ECHO Incorporated
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 may be worn over
safety glasses or goggles to provide protection from sharp
branches or flying debris.
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/Ear Protection
ECHO recommends wearing personal protection 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.

SAFETY 402S
14 X7503256302
© 09/19 ECHO Incorporated
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 BAREFOOTED.
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.
The components of this machine generate an electromagnetic
field during operation, which may 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 / Extreme Conditions
Prolonged exposure to cold and/or vibration may result in
injury. Read and follow all safety and operation instructions to
minimize risk of injury. Failure to follow instructions may result
in painful wrist/hand/arm injuries.

402S SAFETY
X7503256302 15
© 09/19 ECHO Incorporated
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.
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.

SAFETY 402S
16 X7503256302
© 09/19 ECHO Incorporated
• 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 may result.
Do not operate this product indoors or in inadequately
ventilated areas. Engine exhaust contains poisonous emissions
and can cause serious injury or death.
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
Emergency Stop
Both of the operator’s
hands must be used to
operate the chain saw
Fuel and Oil Mixture
H
T
L

402S SAFETY
X7503256302 17
© 09/19 ECHO Incorporated
Hot Surface Chain Oil Fill
Chain Brake Operation Chain Oiler
Adjustment
Choke Control “COLD
START” Position
(Choke Closed)
Purge Pump
Measured maximum
kickback value, without
brake, for approved bar
and chain
combinations.
Symbol Description Symbol Description

SAFETY 402S
18 X7503256302
© 09/19 ECHO Incorporated
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 may 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.

402S EMISSION CONTROL
X7503256302 19
© 09/19 ECHO Incorporated
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 402S
20 X7503256302
© 09/19 ECHO Incorporated
DESCRIPTION
Locate the safety decal(s) on your unit. Make sure the decal(s) 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 Shindaiwa dealer. Safety label is
for example only. Your label my appear slightly different.
X505009400
X505009400
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1920
21
22
23
24