x7722271404 / x772000164
CS-310
CHAIN SAW
Instruction Manual
Burn Hazard
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.
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth defects,
or other reproductive harm.
Users of this equipment risk injury to themselves and others
if the unit is used improperly and/or safety precautions are
not followed. Echo provides and operator’s manual and a
safety manual. Both must be read and understood for proper
and safe operation. Failure to do so could result in serious injury.
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.
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TABLE OF CONTENTS CS-310
TABLE OF CONTENTS
Table of Contents........................................................................................ 2
Packing List.............................................. ................................................... 4
Safety.......................................................................................................... 5
Rules For Safe Oper ation.................................................................... 5
Correct Use Of Chain Brake................................................................ 6
Personal Condition and Safety Equipment.................................... .... 11
International Symbols........................................................................ 15
Manual Safety Symbols and Important Information........................... 16
Emission Control (Exhaust & Evaporative) .............................................. 18
CARB And EPA Emissions Control Information................................. 18
Description....................................................... ......................................... 19
Preparation For Use........................................................................... 21
Operation........................................ ... ....................................................... 24
Fuel....................................................................................... ... .......... 24
Chain Lubricant.................................................................................. 26
Winter Operation............................................. ... ................................ 28
Starting Cold Engine.......................................................................... 28
Starting Warm Engine............................................. ........................... 30
Running ................................. ..................................................... ... .... 30
Stopping............................................... .............................................. 31
Checking Chain Tension.................................................................... 32
Chain Lubrication Test ................................................................... .... 32
Cutting Instructions............................................................................ 32
Chain And Guide Bar Combination.................................................... 37
Guide Bar........................................................................................... 38
Saw Chain.......................................................................................... 38
Maintenance ................................. ..................................................... ... .... 39
Skill Levels......................................................................................... 39
Maintenance Intervals...................................................... .. ................ 39
Carburetor Adjustment..................................................... .. ... ............. 40
Air Filter .............................. ... ............................................................ 42
Spark Plug ......................................................................................... 42
Check Fuel System............................................................................ 42
Fuel Filter........................................................................................... 43
Oil Filter ............................................................................................. 43
Guide Bar........................................................................................... 44
Sprocket............................................... .. ............................................ 44
Cooling System Cleaning................................... ................................ 44
Spark Arrestor Muffler........................................................................ 44
Spark Arrestor Screen ....................................................... ... ............. 45
Exhaust Port Cleaning....................................................................... 45
Setting The Saw Chain.................................................................... .. 47
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Troubleshooting ........................................................................................ 49
Storage..................................................................................................... 50
Storage After Use.............................................................................. 50
Specifications ..................................... ... ... ................................................ 51
Product Registration................................................................................. 52
Servicing Information................................................................................ 58
Parts/Serial Number.......................................................................... 58
Service .......................... ... ..................................................... ... ......... 58
Echo Consumer Product Support...................................................... 58
Product Registration.......................................................................... 58
Additional or Replacement Manuals...................................... ............ 59
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PACKING LIST CS-310
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 - Instruction Manual
____ 1 - Safety Manual
____ 1 - Warranty Statement
____ 1 - Echo Power Blend X™
2-Stroke Oil Sample
____ 1 - Guide bar
____ 1 - Saw chain
____ 1 - Tip Guard Assembly
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CS-310 SAFETY
Rotational kickback
Rotational kickback
Chain moving downward at impact
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 a nd pinches t he
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 th e op e rator. Either of
these reactions may cause you to
lose control of the saw which could
result in serious personal injury.
The tip guard device is not installed
on the guide bar when you purchase
your chain saw. The tip guard 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 tip guard in
place.
Do not rely exclusively upon the safety devices built into your saw. As a
chain saw user, y ou should take several steps to keep your cutting jobs free
from accident or injury.
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SAFETY CS-310
Kickback Danger Zone
Linear kickback
Kickback
Pinch
Locked
1. With a basic understanding of
kickback, you can reduce or
eliminate the element of surprise.
Sudden surprise contributes to
accidents.
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.
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CS-310 SAFETY
Unlocked
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 f orward 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 de vice 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.
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
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SAFETY CS-310
35 cm
(14 in.)
ANSI Standard B175.1 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 here in order to ensure that the brake
performance is maintained in compliance with the Standard
B175.1.
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 sof t
surface substance like wood to absorb the imp act so the chain is not
damaged.
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 twohanded use.
2. Do not operate a chain saw when you are fatigued.
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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 chain saw down.
12. Use extreme caution when cutting small size bru s h and saplings because slender material may catch the saw chain and be whipped toward you or pu l l 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 chain saw only in well ventilated areas.
16. Do not operate a chain saw 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.)
18. When transporting your chain saw, use the appropriate guide bar scabbard.
19. A spark arrestor muffler approv ed 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.
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SAFETY CS-310
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 kee p exhaust area clear of flammable debris during
transportation or when storing, otherwise serious prope rty
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 .
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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 servi cing
dealer before using
.
Personal Condition and Safety Equipment
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.
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Hearing/Ear Protection
ECHO recommends wearing hearing 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 ma terials 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.
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 physicia n
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.
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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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SAFETY CS-310
Repetitive Stress Injuries (RSI)
It is believed that overusin g 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.
Do not operate this product indoors or in inadequately
ventilated areas. Engine exhaust contains poisonous emis sions
and can cause serious injury or death.
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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.
Wear Eye, Ear
and Head
Protection
Tip contact may
cause the guide
bar to move
suddenly upward
and backward,
which may cause
serious injury
Contact of the
guide bar tip with
any object should
be avoided
Both of the
operator’s hands
must be used to
operate the chain
saw
Carburetor
Adjustment -
High Speed
Mixture
Carburetor
Adjustment - Idle
Speed
Carburetor
Adjustment -
Low Speed
Mixture
Emergency Stop
Fuel and Oil
Mixture
Hot Surface Chain Oil Fill
Chain Brake
Operation
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Chain Oiler
Adjustment
SAFETY CS-310
Symbol Description Symbol Description
Choke Control
“COLD START”
Position (Choke
Closed)
Measured
maximum
kickback value,
without brake, for
approved bar and
chain
combinations.
Purge Pump
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.
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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 o r
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 CS-310
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.
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CS-310 DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
20
21
13
22
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.
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DESCRIPTION CS-310
1. CHAIN BRAKE LEVER/ FRONT HAND GUARD - Locks and unlocks the chain brake to stop or allow saw chain rotation. Guard between the front handle and the saw chain helps protect the hand from injuries if the hand slips off the handle.
2. SPARK ARRESTOR MUFFLER OR SPARK ARRESTOR MUFFLER
WITH CATALYST - The muffler or catalytic muffler controls exhaust
noise and emission. The spark arrestor screen prevents hot, glowing
particles of carbon from leaving the muffler. Keep exhaust area clear of
flammable debris.
3. TIP GUARD - Anti-kickbac k device attached to the bar nose.
4. SAW CHAIN - Chain, serving as a cutting tool.
5. GUIDE BAR - The part that supports and guides the saw chain.
6. CHAIN CATCHER - A projection designed to reduce the risk of the operator’s right hand from being hit by a chain which has broken or derailed from the guide bar during cutting.
7. CHAIN TENSION ADJUSTER - Device to adjust chain tension.
8. CHAIN BRAKE/SPROCKET GUARD - Protective cover for the chain brake, guide bar, sa w chain, clutch, and sprocket when the chain saw is in use.
9. REAR HAND GUARD - Extension on the lower part of the rear handle for protecting the hand from the chain if it breaks or derails.
10. PURGE PUMP - When starting engine, push purge pump 3 or 4 times.
11. CHOKE CONTROL KNOB - De vice f or enriching the fuel/air mixture in the carburetor to aid cold starting. Also activates fast idle throttle latch.
12. CYLINDER COVER - The cooling airflow grill. It covers the cylinder, spark plug and silencer.
13. SPARK PLUG - Provides spark to ignite fuel mixture.
14. THROTTLE TRIGGER LOCKOUT - A safety lever which must be
depressed before the throttle trigger can be activated. Prevents
accidental operation of the throttle trigger.
15. REAR HANDLE - FOR THE RIGHT HAND - Support handle located towards the rear of the engine housing.
16. THROTTLE TRIGGER - Device activated by the operator’s finger, for controlling the engine speed. Also releases fast idle throttle latch when squeezed and released immediately after starting engine.
17. IGNITION SWITCH - Device for connecting and disconnecting the ignition system and thus allowing the engine to be started or stopped.
18. FUEL TANK CAP - For sealing the fuel tank.
19. CYLINDER COVER LATCH - Secures cylinder cover.
20. STARTER HANDLE - Pull handle slowly until starter engages then quickly and firmly. When engine sta rts, return handle slowly. DO NOT let handle snap back or damage to unit will occur.
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CS-310 DESCRIPTION
A
B
C
D
E
F
21. FRONT HANDLE - FOR THE LEFT HAND - Support handle located at the front of the engine housing.
22. OIL TANK CAP - For sealing the oil tank.
CHAIN SAW TERMS
1. FAST IDLE - Throttle setting that causes engine to operate at a faster speed for easier starting.
2. THROTTLE LATCH - Device that sets idle speed to fast idle when choke control is operated.
3. CHAIN BRAKE - Stops the saw chain.
4. DRIVE SPROCKET - Drives saw chain.
5. CLUTCH - Turns drive sprocket when engine rpm is fast enough to provide the power needed for cutting.
Preparation For Use
Saw chain is sharp! Always wear gloves when handling
assembly, otherwise serious personal injury may result.
Note: The machine may be d elivered with guide bar,
tip guard, and saw chain separated. Install
guide bar , tip guard , and sa w chain a s f o llows .
Tip Guard to Bar Instructions
Tools Needed: Two 11 mm (7/16 in.)
Wrenches. For saws with tip guard P/N
2894901 and Symmetrical or
Asymmetrical Low-Kick type (Double
Guard) guide bars.
1. Install bolt (A) in rear hole (B) of tip guard and through front hole (C) in guide bar.
2. IMPORTANT: Dimple (D) in tip guard must engage recess (E) in guide bar.
3. Securely tighten nut (F) and bolt (A).
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DESCRIPTION CS-310
A
B
Unlock chain brake
E
D
B
A
F
C
Guide Bar and Saw Chain Installation/Removal
1. Release the cylinder cover latches, and remove the cylinder cover.
2. Remove spark plug lead.
3. Remove sprocket guard nuts (A) and remove sprocket guard (B).
4. Remove guide bar and saw chain if necessary.
Note: See “Maintenance and
Care” section for guide bar/
saw chain maintenance
procedures.
5. Unlock the chain brake, and mount guide bar on studs (C) and slide toward sprocket (E) to make saw chain installation easier. Install chain with cutters on top of guide bar facing forward.
6. Install the sprocket guard over the guide bar studs. Ensure chain tension adjuster pin (F) fits into the guide bar adjuster hole (D). Tighten sprocket guard nuts finger tight.
7. Adjust saw chain tension, as instructed in “Adjustment, Chain Tension”.
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Unlock chain brake
A
Adjusting Chain Tension
Always loosen sprocket guard nuts before turning the
chain tension adjuster , otherwise the sprocket gu ard
and tensioner will be damaged.
1. Release the cylinder cover latches, and remove the cylinder cover. Remove spark plug lead.
2. Unlock chain brake and loosen sprocket guard nuts.
3. Hold the bar nose up , an d turn the adjuster screw (A) clockwise until chain contacts underside of the bar.
4. Tighten nuts with the bar nose held up.
5. Pull the chain around the bar by hand. Loosen the adjustment if you feel tight spots.
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OPERATION CS-310
Tighten guide bar nuts to 20-23 N•m (175-200 in•lbf). DO NOT overtighten nuts. Damage to saw may result.
6. Assemble components in reverse order.
7. Keep chain properly tensioned at all times.
Note: All chains require frequent adjustments.
OPERATION
Fuel
Diesel fuels and alternative fuels, such as E-15 (15% ethanol),
E-85 (85% ethanol) or any fuels not meeting ECHO requirements
are NOT approved for use in ECHO 2-stroke gasoline engines.
Use of diesel or alternative fuels may cause performance
problems, loss of power, overheating, fuel vapor lock, and
unintended machine operation, including, but not limited to,
improper clutch engagement. Diesel or alternative fuels may
also cause premature deterioration of fuel lines, gaskets,
carburetors and other engine components.
Fuel Requirements
Gasoline - Use 89 Octane [R+M/2] (mid grade or higher) gasoline known to
be good quality. Gasoline may contain up to 10% Ethanol (grain alcohol) or
15% MTBE (methyl tertiary-butyl ether). Gasoline containing methanol
(wood alcohol) is NOT approv ed. ECHO Red Armor Fuel
93 octane, ethanol-free fuel premixed with ECHO Red Armor
50:1 ratio. Use of ECHO Red Armor Fuel
to extend engine life in all air-cooled 2-stroke and 2/4-stroke hybrid engines.
Two Stroke Oil - A two-stroke engine oil meeting ISO-L-EGD (ISO/CD
13738) and J.A.S.O. FD
meet these standards. Engine problems due to inadequate lubrication
caused by failure to use an ISO-L-EGD (ISO/CD 13738) and J.A.S.O.
M345-FD
stroke engine warranty.
24 X7503275300
certified oil, such as Echo brand 2-stroke oils, will void the two-
Standards must be used. Echo brand 2-stroke oils
™
(Pow er Fuel™) is recommended
™
(Power Fuel™) is
®
engine oil at
© 1/2017 ECHO Inc.
CS-310 OPERATION
Fuel to Oil Mix – 50:1 Ratio
US Metric
Gas Oil Gas Oil
Gallons Oz. Liter CC.
12.65100
2 5.2 10 200
51325500
Echo brand 2-stroke oils may be mixed at 50:1 ratio fo r application in
all Echo engines sold in the past regardless of ratio sp ecified in those
manuals.
Handling Fuel
Fuel is VERY flammable. Use extreme care when mixing, storing
or handling, or serious personal injury may result.
◆ Use an approved fuel container.
◆ DO NOT smoke near fuel.
◆ DO NOT allow flames or sparks near fuel.
◆ Fuel tanks/cans may be under pressure. Always loosen
fuel caps slowly allowing pressure to equalize.
◆ NEVER refuel a unit when the engine is HOT or RUNNING!
◆ DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks
outdoors over bare ground.
◆ DO NOT overfill fuel tank. Wipe up spills immediately.
◆ Securely tighten fuel tank cap and close fuel container
after refueling.
◆ Inspect for fuel leakage. If fuel leakage is found, do not
start or operate unit until leakage is repaired.
◆ Move at least 3 m (10 ft.) from refueling location before
starting the engine.
Mixing Instructions
1. Fill an approved fuel container with half of the required amount of gasoline.
2. Add the proper amount of 2-stroke oil to gasoline.
3. Close container and shake to mix oil with gasoline.
4. Add remaining gasoline, close fuel container, and remix.
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Spilled fuel is a leading cause of hydrocarbon emissions. Some
states may require the use of automatic fuel shut-off containers to
reduce fuel spillage.
• Empty the fuel tank prior to storing the unit. Return
unused fuel to an approved fuel storage container.
Storage - Fuel storage laws vary by locality. Contact your
local government for the laws affecting your area. As a
precaution, store fuel in an approved, airtight container.
Store in a well-ventilated, unoccupied building, away from
sparks and flames.
Stored fuel ages. Do not mix more fuel than you expect to use in thirty
(30) days, ninety (90) days when a fuel stabilizer is added.
Stored two-stroke fuel may separate. ALWAYS shake fuel container
thoroughly before each use.
Used oil and gasoline, and soiled towels are hazardous waste
materials. Disposal laws vary by locality.
Chain Lubricant
Note: Cap indication - Fuel/oil tanks are indicated b y the following
illustrations
Proper lubrication of the chain while in operation reduces friction between
the chain and the guide bar to a minimum and assures a longer service life.
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Fuel tank cap Oil tank cap
• Use bar and chain oil of high quality
for this purpose.
• Do not use used or reclaimed oil to
avoid various oiler problems.
• Use high quality bar and chain oil.
• Use bar and chain oil of the
following grades:
• SAE No. 30....in summer
• SAE No. 10....in winter or when
cutting resinous trees.
• When refueling, also refill chain oil.
Moving parts can amputate fingers or cause severe injuries.
Keep hands, clothing and loose objects away f rom 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.
Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a
poison gas. Breathing CO can cause unconsciousness, ser ious
injury, or death. Exhaust can cau se serious burns. ALWAYS
position unit so that exhaust is directed away from your face
and body.
Operation of this equipment may create sparks that can start
fires around dry vegetation. This unit is equipped with a spark
arrestor to prevent discharge of hot particles from the engine.
Metal cutters can also create sparks if the cutter strikes rocks,
metal, or other hard objects. Contact local fire authorities for
laws or regulations regarding fire prevention requirements.
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OPERATION CS-310
A
C
B
Chain brake
A
Winter Operation
Air cleaner cover - Use the winter
plug (A) to prevent carburetor trouble
in winter.
• Remove air cleaner cover. Remove
plug from warm weather position
(B), and install into cold weather
position (C).
Note: For operation at normal
temperature (5°C [41°F]) return the plug to its original
position. To prevent over heating of the engine.
Starting Cold Engine
Make sure the bar and chain are free from any
obstruction when starting the chain saw.
1. Move chain brake lever fully
FORW ARD to LOCK chain brake
before starting.
2. Fill the fuel tank with fuel mixture.
Do not over fill.
3. Fill the chain oil tank with
lubricant. Do not over fill.
4. Move ignition switch (A) UP to
“RUN” position.
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B
5. Push purge pump (B) 3 to 4 times or until fuel is visibl e i n purge pump.
6. Pull choke control knob all the way OUT (CLOSED [ ] choke position).
◆ After choke control knob is pulled and then knob is
returned to original position, throttle remains slightly o pen
(fast idle latch condition).
◆ The chain will attemp t to move when e ngine is start ed with
fast idle throttle latch engaged.
◆ Do not start engine before chain brake is locked.
7. Securely hold the chain saw and pull starter handle several times until first starting sound.
8. Push choke control knob all the way IN (OPEN choke position).
9. Pull starter handle to start the engine.
Note: Do not pull starter rope out
to the maximum possible
position.
Note: Do not allow recoil handle
to snap back against the
casing.
◆ After starting the engine, immediately squeeze and then
release throttle trigger to release fast idle throttle latch,
otherwise severe brake damage may occur.
◆ Never use fast idle throttle latch for cutting.
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OPERATION CS-310
Chain brake
◆ Use the fast idle throttle latch only in starting.
Note: If engine does not start after 5 pulls, repeat instructions.
Note: Do not increase engine speed while chain brake is locked.
Severe brake damage will result.
Starting Warm Engine
Make sure the bar and chain are free from any obstruction when
starting the chain saw.
1. Move chain brake lever fully
FORW ARD to LOCK chain brake
before starting.
2. Confirm there is fuel and chain oil in the tanks.
3. Move ignition switch UP to “RUN” position.
4. Securely hold the chain saw as shown and pull starter handle.
5. Choke may be used if necessary , but after first starting sound, squeeze throttle trigger to release choke and return engine to idle.
Note: If engine does not start
after 5 pulls, use cold start
procedure.
Note: Do not increase engine speed while chain brake is locked.
Severe brake damage will result.
Running
The saw chain should not move at idle, otherwise serious
personal injury may result.
Note: If saw chain moves adjust carburetor according to
30 X7503275300
“Carburetor Adjustment” instructions in this manual, or see
your dealer.
© 1/2017 ECHO Inc.
CS-310 OPERATION
Unlock Chain brake
B
A
1. After engine starts, allow it to return to idle and warm up before using.
2. Move chain brake lever fully REARWARD to UNLOCK chain brake.
3. Squeeze throttle trigger (B) gradually and increase engine speed.
4. The chain starts run ning when the engine reaches clutch engagement speed (see technical data page).
5. Confirm proper acceleration and lubrication of chain and bar.
6. Do not run the engine at high speed unnecessarily.
7. Be sure that saw chain stops moving when throttle trigger is released.
Stopping
1. Release throttle trigger and allow engine to idle.
2. Move ignition switch (A) DOWN to “STOP” position.
Note: If engine does not stop, pull
choke control knob out fully
to stop engine.
Note: Return the unit to your
authorized dealer to check
and repair stop switch before starting the engine again.
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OPERATION CS-310
Checking Chain Tension
Chain tension should be checked
frequently during work and corrected
as necessary.
Do not operate with a loose chain.
Chain Lubrication Test
Hold the chain just above a dry
surface and open the throttle to half
speed for 30 seconds.
A thin line of “thrown” oil should be
seen on the dry surface.
Cutting Instructions
General
◆ This ch ain saw is designed for cutting wood.
Do not cut metal, plastic or any non-wood
material.
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Kickback
◆ Read the “CHAIN SAW
SAFETY MANUAL”
included with your chain
saw for additional cutting
and safety instructions.
◆ Wear suitable hearing
protection such as
earmuffs or earplugs to protect against objectionable or
uncomfortable loud noises.
◆ Do not let the tip of the bar
touch anything while the
engine is running. At
cutting speed the chain is
moving at a high rate of
speed. Should the tip
contact a limb or log while
the chain is moving, the tip
will be pushed upward with
considerable force. This is known as kickback. Avoid it!
In all circumstances the operation of the chain saw is a one-man job. It is
difficult at times to take care for your own safety, so don’t assume the
responsibility for a helper as well. After you have learned the basic
techniques of using the saw, your best aid will be your own good common
sense.
The accepted way to hold the saw is
to stand to the left of the saw with
your left hand on the front handlebar
and your right hand on the rear
handle so you can operate the throttle
trigger with your right index finger.
Before attempting to f ell a tree, cut
some small logs or limbs. Become
thoroughly familiar with the controls
and the responses of the saw.
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OPERATION CS-310
Start the engine, see that it is running
properly. Squeeze the trigger to open
the throttle wide open and start the
cut. If the chain is properly
sharpened, the cutting should be
relatively effortless. It is not
necessary to press down hard to
make the saw cut. Pushing the saw
too hard will slow the engine and
cutting will actually be more difficult.
Sap from palm trees may corrode metal parts unless proper saw
maintenance is performed. Make sure to clean m etal parts from palm
sap immediately after use.
• Remove sprocket cover. Clean wood chips and sawdust from cover and
engine crankcase.
• Never use metal tools for cleaning which ma y scratch the metal paint and
allow corrosion to develop.
• Clean sap accumulation from metal parts with cloth and warm water with
soap.
• Rinse with clean water and dry metal surfaces.
• Apply a light coating of engine or bar and chain oil to metal parts after
they are cleaned.
• Install and properly tension guide bar and chain. Run engine for one
minute alternating engine speed between full throttle for 5 seconds and
idle for 5 seconds to coat metal parts with additional protective chain oil.
◆ Do not run a chainsaw not under cutting load at wide open
throttle longer than 5 seconds or engine damage may
occur.
◆ K eep chain properly tensioned during operation to prevent
the chain from jumping out of the guide bar rail slot and
damaging metal engine parts.
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Retreat
Retreat
Direction
45°
45°
3 m (10 feet)
Not this way
of fall
Direction of fall
First cut
Notch
Second cut
One-third tree diameter
5 cm (2 in.)
Felling cut
Hinge
5 cm (2 in.)
Felling The Tree
A falling tree can seriously damage anything it
may hit - a car, a house, a fence, a power line, or
another tree. There are ways to make a tree fall
where you want it, so first decide where that is!
Before cutting, clear the area around
the tree. You will need good footing
while working and you should be able
to work the saw without hitting any
obstacles. Next, select a path of
retreat. When the tree begins to fall
you should retreat away from the
direction of fall at a 45-degree angle
and at least 3 m (10 feet) from the
trunk to avoid the trunk kicking back
over the stump.
Begin the cut on the side to
which the tree is to fall. Cut a
notch about 1/3 of the way into
the tree. The position of this
notch is important since the tree
will try to fall “into” the notch. The
felling cut is made on the side
opposite the notch and at a level
about 5 cm (2 in.) above the
bottom of the notch. Do not try to
cut through to the notch with the
felling cut. The remaining wood
between the notch cut and felling
cut about 5 cm (2 in.) will act as a hinge when the tree falls, guiding it in the
desired direction. When the tree starts to fall, kill the engine, place the saw
on the ground and make your retreat quickly.
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OPERATION CS-310
1
2
3
Finish cut
First cut
Support
Uphill position
To fell big trees with a diameter
exceeding twice the bar length, start
the notching cuts from one side and
draw the saw through to the other
side of the notch. Start the back cut
on one side of the tree, pivoting the
saw through to form the desired hinge
on that side. Then remove the saw for
the second cut. Insert the saw in the
first cut, very carefully so as not to
cause kickback. The final cut is made
by drawing the saw forward in the cut to reach the hinge.
Limbing
Limbing a fallen tree is much the
same as bucking. Never stand on the
tree that you are limbing. When
limbing, caution is the word. Be
careful of the tip touching other limbs.
Always use both hands.
Don’t cut with the saw overhead or
aligned vertically with your body. If the
saw should kickback, you may not
have enough control to prevent
possible injury.
Bucking
Bucking is the sawing of a log or
fallen tree into smaller pieces.
There are a few basic rules which
apply to all bucking operations.
• Keep both hands on the
handles at all times.
• Support logs if possible.
• When cutting on a slope or
hillside, always stand uphill.
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When the bar nose
hits another tree, etc.
Keep in mind that the wood is heavy
and that it will bend and pinch the
saw if improperly supported. The
trunk will weaken at the point where
you make the cut unless the tree is
lying on perfectly flat ground or
supported as shown. If you make the
cut with the tree on the ground, don’t
let the saw’s chain dig into the earth;
it is harmful for the saw, and you
stand a good chance of being struck
by flying debris.
To cut the trunk, use the bucking and two-cut sequence shown. The first cut
should be no deeper than one-third the trunk diameter.
Chain And Guide Bar Combination
The following combinations are recommended for model CS-310.
Guide Bar Saw Chain
Length mm (in.)
305 (12) 12A0CD3745 9.53 (3/8) 91PX / 91VG 45 356 (14) 14A0CD3752 9.53 (3/8) 91PX / 91VG 52 406 (16) 16A0CD3757 9.53 (3/8) 91PX / 91VG 57
ECHO Part No.
Low-kickback
Pitch mm (in.) Type Links
Use of replacement saw chain and/or guide bar other than that
specified, or operation without the “tip guard” in place, may
cause severe kickback resulting in serious injury.
Only use saw chain designated as, “LOW-KICKBACK,” that
meets ANSI B175.1 or CSA Z62.1, .3 Standard when tested on
the representative sample of chain saws below 3.8 C.I.D., and
Echo guide bar specified.
Chain and guide bar gauge size must be identical. Use Bar/Chain
combinations shown in table above.
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OPERATION CS-310
If your tip guard is damaged or lost, contact your Echo dealer for a
replacement. For the name of the Echo dealer nearest you, Call: 1800-432-ECHO (3246) or on the web at www.echo-usa.com
Refer to your Chain Saw Saf ety Man ual f or tip guard application information.
.
Guide Bar
(Low-kickback)
Replacement guide bars.
The following guide bars may be considered to have equivalent kickback
energy.
• Sprocket nose guide bars of the same length and nose radius, same pitch
and having the same number of teeth.
• Hard nose guide bars of the same length and nose radius as a sprocket
nose bar.
Saw Chain
(Low-kickback)
Do not use replacement saw chain unless it has been
designated as meeting ANSI B175.1 or CSA Z62.1, .3 kickback
performance requirements, when tested on the representative
sample of chain saws below 3.8 c.i.d. specified in ANSI B175.1
or CSA 62.1, .3.
Note: LOW KICKBACK SAW CHAIN meets the kickback
performance requirements of ANSI B175.1 or CSA 62.1, .3
(safety requirements for gasoline-powered chain saws).
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CS-310 MAINTENANCE
MAINTENANCE
Moving parts can amputate fingers or cause severe injuries.
Keep hands, clothing and loose objects away f rom 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. Allow unit to
cool before performing service. Wear gloves to protect hands
from sharp edges and hot surfaces.
Your ECHO unit is designed to provide many hours of trouble free service.
Regular scheduled maintenance will help your unit achieve that goal. If you
are unsure or are not equipped with the necessary tools, we recommend
that you take your unit to an ECHO Servicing Dealer for maintenance. T o
help you decide whether you want to DO-IT-YOURSELF or have the ECHO
Dealer do it, each maintenance task has been graded. If the task is not
listed, see your ECHO Dealer for repairs.
Skill Levels
Level 1 = Easy to do. Common tools may be required.
Level 2 = Moderate difficulty. Some special ized tools may be required.
Click HERE or go to http://www.echo-usa.com/products/maintenance-kit f or
information on Maintenance Kits.
Maintenance Intervals
COMPONENT/SYSTEM
Daily or Before Use
Air Filter Inspect/Clean * 1 Automatic Oiler Inspect/Adjust 1 Oil Filter Inspect 1 Fuel System Inspect (1)* 1 Guide Bar & Sprocket Nose Inspect/Clean * 1
Saw Chain
Sprocket Inspect/Replace * 2
Cooling System Inspect/Clean 2
Recoil Starter Rope Inspect/Clean * 1
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MAINTENANCE
PROCEDURE
Inspect/Sharpen/Replace/
Tensioning *
REQ’D
SKILL
LEVEL
2
MAINTENANCE CS-310
T
L
H
COMPONENT/SYSTEM
Screws/Nuts/Bolts Inspect/Tighten/Replace * 1
Every Refuel
Fuel System Inspect (1)* 1
Guide Bar & Sprocket Nose Inspect 1
3 Months
Air Filter Replace * 1 Oil Filter Inspect/Replace * 1 Fuel Filter Inspect * 1 Fuel Cap Gasket Inspect * 1 Spark Plug Inspect/Clean/Replace * 1 Muffler Spark Arrestor Inspect/Clean/Replace * 2 Cylinder Exhaust Port Inspect/Clean/Decarbon 2
Yearly
Fuel Filter Inspect/Replace * 1 Fuel Cap Gasket Replace * 1
IMPORTANT NOTE - Time intervals shown are maximum. Actual use and
your experience will determine the frequency of required maintenance.
MAINTENANCE PROCEDURE NOTES:
(1) Low evaporative fuel tanks DO NOT require regular maintenance to
maintain emission integrity.
* Replacement is recommended based on the finding of damage or wear
during inspection.
MAINTENANCE
PROCEDURE
REQ’D
SKILL
LEVEL
Carburetor Adjustment
Every unit is run at the factory and the
carburetor is set in compliance with
Emission Regulations. In addition, the
carburetor is equipped with “H” (High
Speed) and “L” (Low Speed) needle
adjustment limiters that prevent
settings outside acceptable limits.
Engine Break-In
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New engines must be operated a minimum duration of two tanks of fuel
break-in before carburetor adjustments can be made. During the break-in
period your engine performance will increase and exhaust emissions will
stabilize. Idle speed can be adjusted as required.
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting,
emission, and durability performance up to 1,100 feet above sea lev el (ASL)
(96.0 kPa). To maintain proper engine operation and emission compliance
above 1,100 feet ASL the carburetor may
authorized service dealer.
If the engine is adjusted for operation above 1,100 feet ASL, the
carburetor must be re-adjusted when operating the engine below
1,100 feet ASL, otherwise severe engine damage may result.
1. Before adjusting carburetor clean or replace air filter and muffler “Spark Arrestor Screen”.
2. Make sure the bar and chain are properly adjusted.
3. Start engine and run several minutes to bring to operating temperature. Flash choke twice during warm-up to clear any air from the fuel system.
4. Stop engine. Turn “H” speed needle counterclockwise (CCW) to stop. Turn “L” speed needle midway between full clockwise (CW) stop and CCW stop.
5. Idle Speed Adjustment:
• Start engine, turn “Idle” speed adjustment screw “T” CW until the saw
chain begins to move, then turn screw out CCW until the saw chain
stops moving. T urn screw out, CCW , an additional 1/4 turn.
need to be adjusted by an
When carburetor adjustment is completed, the saw chain
should not move at idle, otherwise serious personal injury may
result.
6. Accelerate to full throttle for 2 - 3 seconds to clear any excess fuel in
the engine, then return to idle. Accelerate engine to full throttle to check
for smooth transition from idle to high speed. If engine hesitates turn “L”
needle CCW 1/8 turn and repeat acceleration. Continue adjustment
until smooth acceleration results.
7. Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speed should be set to value listed on technical data page.
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MAINTENANCE CS-310
A
C
B
0.65 mm (0.026 in.)
When starting, idling adjustment speed should be adjusted to
prevent the saw chain from moving. When you experience
trouble with the carburetor, contact your dealer.
Air Filter
1. Check before every use.
2. CLOSE choke ( ).
3. Press hand guard FORWARD and LOCK chain brake.
4. Release the cylinder cover latches (C) and remove cylinder cover (A) and air filter (B).
5. Lightly brush dust off air filter, or clean with compressed air, or replace the air filter.
6. Install air filter and cylinder cover, engage latches.
Spark Plug
• Check periodically.
• The standard spark gap is 0.65 mm
(0.026 in.).
• Fastening torque: 13-17 N•m (110-
150 in•lbf).
1. Remove cylinder cover and remove spark plug.
2. Correct the spark gap if it is wider or narrower than the standard gap.
Check Fuel System
• Check before every use.
• After refueling, make sure fuel does not leak from around fuel pipe, fuel
grommet or fuel tank cap.
• In case of fuel leakage there is a danger of fire. Stop using the machine
immediately and request your dealer to inspect or replace.
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A
B
Fuel Filter
• Check periodically.
• Do not allow dust to enter fuel tank.
• A clogged filter (A) will cause
difficulty in starting engine or
abnormalities in engine
performance.
1. Pull filter out through gas port,
and inspect filter.
2. When the filter is dirty, replace it.
Do not damage fuel line while removing fuel filter from tank.
3. When the inside of the fuel tank is dirty, rinse the tank out with gasoline
to clean it.
Note: Federal EPA regulations requ ire all model y ear 201 2 and later
gasoline powered engines produced for sale in the United
States to be equipped with a special low permeation fuel
supply hose between the carburetor and fuel tank. When
servicing model year 2012 and later equipment, only fuel
supply hoses certified by EPA can be used to replace the
original equipment supply hose. Fines up to $37,500 may be
enforced for using an un-certified replacement part.
Oil Filter
• Check periodically.
• Do not allow dust to enter into oil
tank.
• A clogged oil filter (B) will affect the
normal lubricating system.
1. Pull filter out through oil port, and
inspect filter.
2. If the filter is dirty, wash it in gasoline or replace it.
3. When the inside of the tank gets dirty, rinse the tank out with gasoline
to clean it.
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MAINTENANCE CS-310
A
B
Worn: 0.5 mm (0.020 in.)
Cylinder fins
Guide Bar
1. Clean before using.
2. Clean the groove (A) of the guide bar with a small screwdriver.
3. Clean oil holes (B) with a wire.
4. Inve rt guide bar periodica ll y.
5. Clean the bar mount area before installing of the bar.
Sprocket
• A damaged sprocket will cause
premature damage or wear of saw
chain.
• When the sprocket has worn 0.5
mm (0.020 in.) or more, replace it.
• Check sprocket when you install
new chain. Replace it if worn.
Some tree sap and resins are corrosive. Thoroughly wash the guide
bar and sprocket areas after each use, then coat met al parts with light
oil.
Cooling System Cleaning
• Check periodically.
• Clogged fins will result in poor
engine cooling.
1. Remove cylinder cover and starter.
2. Use compressed air or wooden tool to remove dirt and dust from between fins to let cooling air pass easily.
Spark Arrestor Muffler
• The spark arrestor muffler controls the exhaust noise and prevents hot,
glowing particles of carbon from leaving the muffler.
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A
C
B
• Make sure the spark arrestor screen is in good repair and properly seated
in the muffler.
• Certain inter nal combustion engines operated on forest, brush, and/or
grass-covered areas in the states of Washington, Oregon, Idaho,
California, Minnesota, New Jersey and Maine, are required to be
equipped with a spark arrestor.
This requirement also applies to all U.S. Forest Service lands. In some of
these areas, the spark arrestor system must be certified per USDA Forest
Service Regulation SAE J335.
Check with your local or state authorities for specific regulations in your
area. Failure to follow these requirements is a violation of the law.
Spark Arrestor Screen
Carbon deposits in muffler will cause drop in engine output and
overheating. Spark arrestor screen must be checked periodically.
1. Remove air cleaner cover and
remove spark plug lead.
2. Remove spark arrestor cover (C)
and screen (B) from muffler (A)
body.
3. Clean carbon deposits from
muffler components.
4. Replace screen if it is cracked, or
has holes burned through.
5. Assemble components in reverse
order.
Note: When cleaning carbon deposit, be careful not to dam age the
catalytic element inside muffler.
Exhaust Port Cleaning
Level 2.
Parts Required: As needed: Muffler gasket
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MAINTENANCE CS-310
1. Remove cylinder cover and remove spark plug lead.
2. Place piston at top dead center.
3. Remove muffler. Check parts for wear or damage, and replace if necessary.
Never use a metal tool to scrape carbon from the exhaust port. Do
not scratch the cylinder or piston when cleaning the e xhaust port. Do
not allow carbon particles to enter the cylinder.
4. Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port.
5. Install muffler. Tighten muffler mounting bolts (or nuts) to 7 - 9 N•m (60-80 in•lbf).
6. Install cylinder cover and attach spark plug lead.
7. Start engine, and allow unit to warm up at idle for several minutes.
8. Stop engine, and re-tighten mounting bolts (or nuts) to 7 - 9 N•m (60-80 in•lbf).
9. Install guide bar and chain. Adjust chain tension.
10. Start engine and check for exhaust leaks between muffler and cylinder head. Stop engine if leak is found and correct problem before operating chain saw.
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Top plate
Side plate
Depth
Left hand cutter
Preset tie strap
gauge
Guard link
Drive link
Tie strap
Right hand cutter
Sharpen lower edge
30°
Keep this angle
Setting The Saw Chain
Important points for proper maintenance of saw chain:
• Keep the cutters sharp at all times.
• Keep the left and the right cutters properly aligned.
• Note that blunt or irregular cutters will result in poor
cutting performance, increased vibration of chains and
premature breakage of the saw chain.
• Drive link serves to remove
sawdust from the groove of the
guide bar. Keep the lower edge of
the drive link sharp where
indicated.
Setting Saw Chain
• For setting saw chain, round file
(4.0 mm [5/32 in.] diam.) and flat
file are used.
• Push file as shown.
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MAINTENANCE CS-310
90°
1/5
Depth gauge tool
55°
Side plate angle
30°
Top plate filing angle
• T o keep correct position and correct
angle, use a file hold er.
• Hold the file horizont a ll y.
• Place the depth gauge tool firmly
on guide bar so that depth gauge
protrudes. Then file top of depth
gauge with the flat file until flat with
top of the depth gauge tool.
• One fifth of the file diameter
remains above cutter edge.
• Be sure to round off the front edge
of the depth gauge.
• Properly filed cutters are shown in
illustration.
• When setting of the chain is
finished, soak it in oil and
wash away filings completely
before using.
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CS-310 TROUBLESHOOTING
0.64 mm (0.025 in.)
Parallel
Depth gauge
• When chain has been filed on the
bar, supply sufficient oil to it, move
the chain slowly to wash away the
filings before using again.
• If the chain saw is operated with
filings clogged in the groove, the
saw chain and the guide bar will be
damaged prematurely.
• If the saw chain becomes soiled
with resin, for instance, clean it with
kerosene and soak in it oil.
To sharpen other chains, follow chain manufacturer’s instructions.
TROUBLESHOOTING
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem Check Status Cause Remedy
Fuel at
carburetor
Engine
starts
hard
or
Engine
does not
start
Fuel at
cylinder
Spark at
end of plug
wire
Spark at
plug
No fuel at
carburetor
No fuel at
cylinder
Muffler wet
with fuel
No spark
No spark
Fuel strainer or
fuel line
obstructed
Carburetor
Fuel mixture
too rich
Stop switch
OFF - Electrical
problem Interlock switch
Incorrect gap -
Covered with
carbon - Fouled
with fuel - Plug
defective
Clean or replace
See your Echo
dealer
See your Echo
dealer
OPEN choke
Clean or replace
air filter
Adjust carburetor
See your Echo
dealer
Turn switch to ON
See your Echo
dealer
Adjust to 0.65mm
(0.026 in.)
Clean or replace
plug
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STORAGE CS-310
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem Check Status Cause Remedy
Air filter Air filter dirty Normal wear Clean or replace
Engine
runs, but
dies
or
Engine
does not
accelerate
properly
Engine
does not
crank
Fuel filter Fuel filter dirty
Fuel vent
Spark plug
Carburetor
Cooling
system
Spark
arrestor
screen
N/A N/A
Fuel vent
plugged
Plug dirty or
worn
Improper
adjustment
Cooling
system dirty
or plugged
Spark
arrestor
screen
plugged
Contaminants
or residue in
fuel
Contaminated
fuel
Normal wear
Vibration Adjust
Extended
operation in
dirty or dusty
locations
Normal wear Replace
Internal engine
problem
Replace filter or
replace fuel
Clean or replace
Clean and adjust
or replace
Clean
See your Echo
dealer
Fuel vapors are extremely flammable and may cause fire an d/or
explosion. Never test for ignition spark by grounding spark plug
near cylinder plug hole, otherwise serious personal injury may
result.
STORAGE
Storage After Use
• Inspect and adjust every part of the chain saw.
• Completely clean every part and repair if necessary .
• Apply thin coating of oil on metal parts to prevent rust.
• Remove chain and guide bar.
• Drain fuel tank completely. Press purge bulb 6-7 times to remove
remaining fuel from carburetor then drain the tank again. Close choke,
start and run the engine until it stops due to lack of fuel.
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CS-310 SPECIFICATIONS
• Allow engine to cool then remove the spark plug and pour 7 cc (1/4 oz.) of
fresh, clean, two-stroke engine oil into the cylinder through the spark plug
hole.
• Store in a dry area, free from dust.
Do not store in an enclosure where fuel fumes may accumulate
or reach an open flame or spark.
Do not lend or rent your chain saw without the Instruction
manual and Safety manual.
Note:
• For future reference, y ou should keep this Instruction manual and the
Safety manual.
• If this Instruction manual or the Safety manual has become illegible or
is lost, please contact your ECHO dealer, or go to www .echo-usa.com.
SPECIFICATIONS
Model CS-310
Length 396 mm (15.6 in.)
Width 232 mm (9.1 in.)
Height 273 mm (10.7 in.)
Dry weight 4.0 kg (8.8 lb.) Without chain and guide bar
Engine Air-cooled two-stroke single cylinder
Displacement 30.5 mL (1.861 cu. in.)
Bore 36.0 mm (1.417 in.)
Stroke 30.0 mm (1.181 in.)
Compressions ratio 6.7:1
Carburetor Diaphragm type
Spark plug NGK BPMR8Y (Gap 0.65 mm [0.026 in.])
Fuel tank capacity 250 mL (8.45 US. fl. oz.)
Fuel
50:1 ratio with ECHO Power Blend X™ or
ECHO Red Armor
13738) and JASO M345-FD two-stroke, aircooled engine oil.
®
ISO-L-EGD (ISO/CD
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PRODUCT REGISTRATION CS-310
Model CS-310
Use 89 octane unleaded. Do not use fuel
Gasoline
Oiling system automatic oiler
Chain oil capacity 260 mL (8.8 US. fl. oz.)
Starter system Automatic rewind starter
Clutch Centrifugal type
Sprocket type Spur type, 6-tooth, 3/8 in. pitch
Chain brake Automatic band brake type
Idle speed 3,200 RPM
Clutch engagement speed 4,200 RPM
Wide open throttle speed
(W.O.T.)
Chain tensioner Side access system
Guide bar 12, 14, 16 in
Saw chain 91PX/91VG
Standard features
Technical data subject to change without notice.
containing methyl alcohol, more than 10% ethyl
alcohol or 15% MTBE. Do not use alternative
fuels such as E-15 or E-85.
12,500 RPM
Front hand guard, Rear hand guard, Antivibration device, Throttle control lockout, Chain
catcher, Spark arrestor muffler, Tip guard,
(Spiked bumper; Option)
PRODUCT REGISTRATION
Thank you for choosing ECHO Power Equipment
Please go to http://www.echo-usa.com/Warranty/Register-Your-ECHO to
register your new product on-line. It's FAST and EASY! NOTE: your
information will never be sold or misused by ECHO, Inc. Registering your
purchase enables us to contact you in the unlikely event of a service update
or product recall, and verifies your ownership for warranty consideration.
If you do not have access to the Internet, you can complete the form below
and mail to:
ECHO Inc., Product Registration, PO Box 1139, Lake Zurich IL 60047.
52 X7503275300
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CS-310 PRODUCT REGISTRATION
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PRODUCT REGISTRATION CS-310
NOTES
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CS-310 PRODUCT REGISTRATION
NOTES
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PRODUCT REGISTRATION CS-310
NOTES
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NOTES
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SERVICING INFORMATION CS-310
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. You can find these numbers
on the engine housing. 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 Frid ay. 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.
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CS-310 SERVICING INFORMATION
Additional or Replacement Manuals
Replacement Operator or Safety Manuals, and Parts
Catalogs, are available from your Authorized ECHO
Service Dealer, or at www.echo-usa.com, or by contacting
ECHO Inc., 400 Oakwood Road, Lake Zurich, IL 60047
(800-673-1558). Always check www.echo-usa.com for
updated information.
Safety Videos are available from y our Authorized ECHO Service Dealer. A
$5.00 shipping charge is required for each video.
X7503275300 59
© 1/2017 ECHO Inc.
C67815001001-C67815999999
C67915001001-C67915999999
ECHO, INCORPORATED
400 Oakwood Road
Lake Zurich, IL 60047
www.echo-usa.com
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