Echo CS-310 User manual

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© 02/2019 ECHO Inc.
Operator’s
Manual
CS-310
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.
This product complies with CAN ICES-2/NMB-2.

TABLE OF CONTENTS CS-310
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TABLE OF CONTENTS
Introduction ................................................................................................. 4
Servicing Information .................................................................................. 5
Parts/Serial Number............................................................................. 5
Service................................................................................................. 5
ECHO Consumer Product Support...................................................... 5
Product Registration ............................................................................ 5
Additional Literature............................................................................. 5
Packing List................................................................................................. 6
Safety.......................................................................................................... 6
Rules For Safe Operation .................................................................... 6
Correct Use Of Chain Brake ................................................................ 8
Personal Condition and Safety Equipment ........................................ 12
International Symbols ........................................................................ 16
Manual Safety Symbols and Important Information ........................... 18
Emission Control (Exhaust & Evaporative) .............................................. 19
CARB And EPA Emissions Control Information ................................ 19
Description ................................................................................................ 20
Preparation For Use........................................................................... 22
Operation .................................................................................................. 25
Fuel.................................................................................................... 25
Chain Lubricant.................................................................................. 28
Winter Operation................................................................................ 29
Starting Cold Engine.......................................................................... 29
Starting Warm Engine........................................................................ 31
Running ............................................................................................. 33
Stopping............................................................................................. 34
Checking Chain Tension.................................................................... 34
Chain Lubrication Test....................................................................... 34
Cutting Instructions ............................................................................ 35
Chain And Guide Bar Combination.................................................... 39
Guide Bar........................................................................................... 40
Saw Chain ......................................................................................... 40

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Maintenance ............................................................................................. 41
Skill Levels ........................................................................................ 41
Maintenance Intervals ....................................................................... 42
Carburetor Adjustment ...................................................................... 43
Air Filter ............................................................................................. 44
Spark Plug......................................................................................... 45
Check Fuel System ........................................................................... 45
Fuel Filter .......................................................................................... 45
Oil Filter ............................................................................................. 46
Guide Bar .......................................................................................... 46
Sprocket ............................................................................................ 46
Cooling System Cleaning .................................................................. 47
Spark Arrestor Muffler ....................................................................... 47
Spark Arrestor Screen....................................................................... 48
Exhaust Port Cleaning....................................................................... 48
Setting The Saw Chain...................................................................... 49
Troubleshooting........................................................................................ 52
Storage ..................................................................................................... 54
Long Term Storage (Over 30 Days) .................................................. 54
Specifications ........................................................................................... 55
Product Registration ................................................................................. 56
Notes......................................................................................................... 58

INTRODUCTION CS-310
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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

CS-310 SERVICING INFORMATION
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SERVICING INFORMATION
Parts/Serial Number
Genuine ECHO Parts and
Assemblies for your ECHO products
are available only from an Authorized
ECHO 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. _______________
Service
Service of this product during the warranty period must be performed by an
Authorized ECHO Service Dealer. For the name and address of the
Authorized ECHO Service Dealer nearest you, ask your retailer or call:
1-800-432-ECHO (3246). Dealer information is also available on our Web
Site www.echo-usa.com. When presenting your unit for Warranty service/
repairs, proof of purchase is required.
ECHO Consumer Product Support
If you require assistance or have questions concerning the application,
operation, or maintenance of this product, call the ECHO Consumer
Product Support Department at 1-800-673-1558 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
Register your ECHO equipment on-line at www.echo-usa.com or by filling
out the product registration sheet included in this manual. Registering your
product confirms warranty coverage and provides a direct link to ECHO if
we find it necessary to contact you.
Additional Literature
In addition to finding information online, information is available from your
Authorized ECHO Service Dealer, or by contacting ECHO Inc., 400
Oakwood Road, Lake Zurich, IL 60047 (800-673-1558).

PACKING LIST CS-310
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Safety Videos are available from your Authorized ECHO Service Dealer. A
$5.00 shipping charge is required for each video.
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.
SAFETY
Rules For Safe Operation
1. Fatigue causes carelessness. Be more cautious
before rest periods and before the end of your shift.
2. Personal protective clothing required by your safety
organizations, government regulations, or your
employer should be used; otherwise, snug fitting
clothing, protective eye wear, safety footwear and
hand, leg and hearing protection should be worn.
Note: Personal protective
clothing should meet the
requirements of
applicable Standards.
3. Before fueling, servicing or
transporting your chain saw
switch off the engine. To help
prevent fire, restart your chain
saw at least 3 m from the fueling
area.
4. When using a chain saw a fire extinguisher should be available.
1 Power Head
1 Operator's Manual
1 Warranty Statement
1 Guide Bar
1 Saw Chain
1TipGuard
Rotational kickback

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5. When felling, keep at least 2 tree
lengths between yourself and
your fellow workers.
6. Plan your work; assure yourself
of an obstacle-free work area
and, in the case of felling, have at
least one escape path from the
falling tree prepared in advance.
7. Follow instructions in your
operator’s manual for starting the
chain saw and control the chain saw with a firm grip on both handles
when it is in operation. Keep handles dry, clean and free of oil. A chain
saw should never be carried with the engine running.
8. When transporting your chain
saw, use the appropriate
transportation covers that should
be available for the guide bar and
saw chain.
9. Never operate a chain saw that is
damaged, improperly adjusted,
or is not completely and securely
assembled. Be sure that the saw
chain stops moving when the
throttle control trigger is released. Never adjust the guide bar or saw
chain when the engine operating.
10. Beware of carbon monoxide
poisoning. Operate the chain saw
in well-ventilated areas only.
11. Do not attempt a pruning or
liming operation in a standing
tree unless specifically trained to
do so.
12. Guard against kickback.
Kickback is the upward motion of
the guide bar, which occurs when the saw chain, at the nose of the
guide bar, contact an object. Kickback can lead to dangerous loss of
the chain saw.
TO AVOID KICKBACK:
a. Contact of the guide bar tip with any object should be avoided.
b. Tip contact may cause the guide bar to move suddenly upward and
backward which may cause serious injury.
c. Always use two hands when operating the chain saw.
d. Use a firm grip, thumbs and fingers encircling the handles.
e. Don’t overreach.
Rotational kickback
Chain moving downward at impact
Kickback Danger Zone
Linear kickback
Kickback
Pinch

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f. Avoid cutting above shoulder height.
g. Follow the manufacturer’s instructions for sharpening and
maintenance of the saw chain.
13. When boring with the chain saw, 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.
14. A chain saw is intended for two-handed use. Serious injury to the
operator, helpers and/or bystanders may result from one-handed
operation.
a. Allow your chain saw to cool before refueling, and do not
smoke while refueling.
b. Do not allow other persons or animals close to running chain
saw or close to where a tree is being felled.
c. Use extreme caution when cutting small size brush and
saplings because slender material may catch the saw chain
and be whipped toward you.
d. When cutting a limb that is under tension be alert for spring-
back.
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.
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's while the chain brake is locked.
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.
This chain brake has been designed and tested to comply with international
safety standards as follows.
Canada: CSA Standard Z62.1, Z62.3
USA: ANSI Standard B175.1 Safety Requirement for chain saws
Unlocked

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CSA Z62.1, .3 stipulates 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 herein in order to ensure that the brake
performance is maintained in compliance with the Standard
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.
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.
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.
35 cm
(14 in.)

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◆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.
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.

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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 may 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 may be worn over
safety glasses or goggles to provide protection from sharp
branches or flying debris.

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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/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.
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.

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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.
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 may result.

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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 precaution 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
Hot Surface Chain Oil Fill
H
T
L

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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

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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.

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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.
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 CS-310
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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 ECHO dealer. Safety label is for
example only. Your label my appear slightly different.
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