Echo SRM-2100SB, SRM-2400SB User Manual

Grass T rimmer/Brush Cutter

Operator's Manual

MODELS, Type 1E SRM - 2100SB

Serial Number 0533424 & Up

SRM - 2400SB

Serial Number 0563001 & Up

X7532277103

W ARNING DANGER

Read rules for safe operation and instructions carefully. ECHO provides an
Operator's Manual with this unit and a separate Operator's Manual and Safety
Manual (if available) with the attachment. All manuals must be read and under­stood for proper and safe operation. Failure to do so could result in serious injury.

89861056733
12/01

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

MANUAL SAFETY SYMBOLS AND IMPORTANT INFORMATION

Throughout this manual and on the product itself, you will find
safety alerts and helpful, information messages preceded by
symbols or key words. The following is an explanation of those
symbols and key words and what they mean to you.

This symbol accompanied by the words WARNING and
DANGER calls attention to an act or condition that can lead
to serious personal injury to operator and bystanders.

The circle with the slash symbol means whatever is shown
within the circle is prohibited.

IMPORTANT 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.

3

SAFETY

DECALS

Locate these safety decals on your unit. The complete unit illustration,
found in the "DESCRIPTION" section, will help you locate them. Make
sure the decals are legible and that you understand and follow the
instructions on them. If a decal cannot be read, a new one can be
ordered from your ECHO dealer. See PARTS ORDERING instructions
for specific information.

DEBRIS SHIELD DECAL

4

4

Shaft Decal

W ARNING DANGER

• This unit can be dangerous and cause serious injury if improperly
used. To reduce injury risk to operator, helpers and bystanders,
read and understand the Operator's and Safety manuals.

• Blindness can occur from objects that are thrown or ricocheted even
with shield in place. Operators, helpers and bystanders must wear

ANSI Z87.1 approved eye protection.

• Always wear hearing protection when operating unit.

• Prevent accidental contact with unit and any cutting attachment.
Maintain a 15M (50 ft.) radius, DANGER ZONE surrounding the
operator. ONLY the operator, dressed in proper protective clothing
should be in the DANGER ZONE.

• Beware of KICKOUT (blade thrust) when using blades. Special
precautions are necessary for blade operation, see your Operator's
and Safety Manuals. ONLY install ECHO approved blades on
Brush Cutters (SRM) models equipped with proper blade shield,
U-handles, harness, blade collar, nut and cotter pin.

• Blade/Cutting attachment does not stop immediately after releasing
throttle. Keep hands and feet clear of blade/cutting attachment
unless engine is shut off and cutting attachment is not moving.

• INSPECT BLADES BEFORE USE.

• DO NOT USE DAMAGED, CRACKED, BENT, DULL OR
IMPROPERLY SHARPENED BLADES.

• Do not remove shields, modify the unit or install attachments or
parts not approved by ECHO. Approved attachment information
and replacement Operator's and Safety Manuals are available from
your ECHO dealer or by writing: ECHO, INCORPORATED, 400

OAKWOOD RD., LAKE ZURICH, IL 60047.

P/N 89016844830

INTERNA TIONAL SYMBOLS

Symbol form/shape

Symbol

description/application

"WARNING, SEE

OPERATOR'S

MANUAL

Wear eyes, ears and

head protection

Finger Severing

Wear hand and

foot protection

Symbol form/shape

Keep bystanders and helpers

away 15 m (50 ft.).

Symbol

description/application

Hot

Surface

Fuel and oil mixture

Emergency stop

WARNING

Symbol form/shape

Symbol

description/application

Carburetor adjustment

- High speed mixture

Carburetor adjustment

- Idle speed

Carburetor adjustment

- Low speed mixture

Blade and string

line capable

Do not exceed

10,000 RPM.

Symbol form/shape

Symbol

description/application

Primer Bulb

Ignition
ON/OFF

Engine choke

control.

Do not operate

without guards and

shields in place.

BEWARE

- Thrown,
Ricochet

objects

SAFETY INSTRUCTIONS

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

5

PERSONAL

CONDITION AND SAFETY EQUIPMENT

W ARNING DANGER

Trimmer/Brush Cutter users risk injury to themselves and others if the trimmer/brush cutter is used improperly
or safety precautions are not followed. Proper clothing and safety gear must be worn when operating a
trimmer/brush cutter.

Eye Protection

Wear eye protection that meets ANSI Z87.1 or CE
requirements whenever you operate the trimmer.

Hand Protection

Wear no-slip, heavy duty work gloves to improve your
grip on the Trimmer/Brush Cutter handles. Gloves also
reduce the transmission of machine vibration to your
hands.

Hearing Protection

ECHO recommends wearing hearing protection whenever
unit is used.

Proper Clothing

Wear snug fitting, durable clothing;

• Pants should have long legs, shirts with long
sleeves.

• DO NOT WEAR SHORTS,

• DO NOT WEAR TIES, SCARVES, JEWELRY.

Wear sturdy work shoes with non-skid soles;

• DO NOT WEAR OPEN TOED SHOES,

• DO NOT OPERATE UNIT BAREFOOTED.

EXTENDED OPERATION/EXTREME CONDITIONS

Vibration and Cold

It is believed that a condition called Raynaud’s Phenomenon, which
affects the fingers of certain individuals, may be brought about by
exposure to vibration and cold. Exposure to vibration and cold may
cause tingling and burning 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 trimmer or other hand-held power equipment is not
required.

• If you experience discomfort, redness and swelling of the fingers
followed by whitening and loss of feeling, consult your physician
before further exposing yourself to cold and vibration.

6

Repetitive Stress Injuries

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.

EQUIPMENT

W ARNING DANGER

Use only ECHO approved attachments. Serious injury may result from the use of a non-approved attachment combi­nation. ECHO, INC. will not be responsible for the failure of cutting devices, attachments or accessories which have
not been tested and approved by ECHO. Read and comply with all safety instructions listed in this manual and safety
manual.

• Check unit for loose/missing nuts, bolts, and screws. Tighten and/or
replace as needed.

• Inspect fuel lines, tank, and area around carburetor for fuel leaks. DO
NOT operate unit if leaks are found.

• Inspect shield for damage and ensure that the cut-off knife issecurely
in place. Replace if either is damaged or missing.

• Check that the cutting attachment is firmly attached and in safe
operating condition.

• Check that front loop handle and shoulder strap/ or shoulder/
waist harness are adjusted for safe, comfortable operation. See
Assembly Section for proper adjustment.

• Keep exhaust area clear of flammable debris. Avoid contact during
and immediately after operation.

GRASS TRIMMER/BRUSH CUTTER

SAFE OPERATION

W ARNING DANGER

Do not operate this product indoors or in inadequately ventilated
areas. Engine exhaust contains poisonous emissions and can cause
serious injury or death.

PROVIDE ALL OPERATORS OF THIS EQUIPMENT WITH THE
OPERATOR'S MANUAL AND INSTRUCTIONS FOR SAFE OPERA­TION.

Keep A Firm Grip

• Hold the front and rear handles with both hands with thumbs and
fingers encircling the handles

Keep A Solid Stance

• Maintain footing and balance at all times. Do not stand on slippery,
uneven or unstable surfaces. Do not work in odd positions or on
ladders. Do not over reach.

OPERATOR'S MANUAL

7

EMISSION CONTROL

Type 1E Models

The emission control system for this engine is EM (Engine Modifica­tion).

Emission Control Label located on Engine
(EXAMPLE ONLY, information on label varies by FAMILY).

IMPORTANT ENGINE INFORMATION

ENGINE FAMILY: TEH024UB24RA
DISPLACEMENT: 23.6 CC
THIS ENGINE MEETS U.S. EPA PH1 EMISSION
REGULATIONS FOR SMALL NON ROAD ENGINES.
REFER TO OWNER'S MANUAL FOR MAINTENANCE
SPECIFICATIONS AND ADJUSTMENTS.

DESCRIPTION

The ECHO product you purchased has been factory pre-assembled for your convenience. Due to packaging restrictions,
shield installation and other 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.

8

CONTENTS

Contents List

Items

1 - Power Head w/Upper Drive Shaft Assembly
1 - Lower Drive Shaft Assembly
1 - Plastic Bag (co-pack)

- 1, Operator's Manual

- 1, Safety Manual

- 1, Warranty Registration Card

- 1, Limited Warranty Statement

- 1, Plastic shield

- 1, Tool Bag

--1, 8 mm x 10 mm wrench

--1, scrench

--1, locking tool

- 1, Nylon Trimmer Head

- 1, Safety Glasses

- 1, 2-Stroke Oil Sample, 2.6 oz.

- 1, Front Handle (L.H.) Assembly

-- 1, Plastic Bag

---1, shield plate

--- 3, 5 mm x 15 mm screws (shield mounting)

MODELS

SRM-2400SBSRM-2100SB

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22

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

13

14

21

20

9

15

19

18

8

7

9

10

11

6

5

17

4

3

2

16

1

12

10

1. POWER HEAD - Includes the Engine, Clutch, Fuel System, Ignition System and Recoil Starter.

2. GRIP - Rear (right hand) handle.

3. THROTTLE TRIGGER LOCKOUT - Operation of the throttle trigger is prevented unless throttle trigger lockout lever is

engaged.

4. STOP SWITCH - "SLIDE SWITCH" mounted on top of the Throttle Trigger Housing. Move switch FORWARD to RUN,

BACK to STOP.

5. UPPER DRIVE SHAFT ASSEMBLY - Includes the Rear (Right Hand) Grip Assembly, Front (Left Hand) Handle Assem-

bly, Upper Flexible Drive Cable, Drive Shaft Assembly Coupler and Power Head.

6. FRONT HANDLE - The front (loop) handle must be assembled to the Upper Drive Shaft Assembly (some models) and

must be positioned for proper cutting attitude and operator comfort.

7. DRIVE SHAFT COUPLER - Includes Locator Pin and Clamping Knob.

8. NYLON CUTTING ATTACHMENT - Contains replaceable nylon trimming line that advances when the trimmer head is

tapped against the ground while the head is turning at normal operating speed.

9. CUT-OFF KNIFE - Automatically trims line to the correct length: 5 in. after head is tapped on the ground. If trimmer is

operated without a cut-off knife the line will become too long, the engine will overheat and engine damage may occur.

10. PLASTIC DEBRIS SHIELD ASSEMBLY - Included in plastic bag (co-pack). MUST be installed on unit before use, see

Assembly Instructions. Shield assembly includes the Cut-Off Knife and Safety Decal. Mounts on the Gear Housing
Assembly just above the cutting attachment. Helps protect the operator by deflecting debris produced during the trimming
operation. This shield must be replaced with the steel shield for blade use.

11. LOWER DRIVE SHAFT ASSEMBLY - Includes the Debris Shield Assembly, Gear Housing Assembly, Lower Flexible

Drive Cable, Nylon Cutting Attachment and Safety Decal.

12. THROTTLE TRIGGER - Spring loaded to return to idle when released. During acceleration, press trigger gradually for

best operating technique.

13. ARM REST - Provides arm rest during operation and protects arm from the hot engine.

14. SPARK PLUG - Provides spark to ignite fuel mixture.

15. MUFFLER/SPARK ARRESTOR - The muffler controls the exhaust noise while the spark arrestor prevents hot, glowing

particles of carbon from leaving the muffler where they could possibly start a fire.

16. FUEL TANK - Contains fuel and fuel filter.

17. RECOIL STARTER HANDLE - Pull recoil starter handle slowly until starter engages, then quickly and firmly. When

engine starts, return handle slowly. DO NOT let handle snap back or damage to unit will occur.

18. FUEL TANK CAP - Covers and seals fuel tank opening.

19. PRIMER BULB - Pumping primer bulb before starting engine draws fresh fuel from the fuel tank priming the carburetor for

starting. Pump the bulb 10 times until fuel is visible in clear fuel return line.

20. AIR CLEANER - Contains replaceable filter element.

21. CHOKE - The choke control lever is located on the top of the air filter case. Move lever to "COLD START" to close choke

for cold starting. Move lever to the "RUN" position to open choke.

22. SAFETY VIDEO - (Not included with unit) P/N 99922202540 English version only is available at a cost of $5.00 from ECHO,

INC. or any authorized ECHO dealer. The video overviews safety precautions and proper operating techniques and is
supplemental to the Safety Manual. Read and understand the Safety Manual for complete information on safe operation.

SPECIFICATIONS

LEDOMBS0012-MRSBS0042-MRS

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

11

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* Install and use U-Handle when operating any model with steel blade.
**The RPM range shown applies for all attachments. Refer to your attachment Operator's Manual "Specifications"

section for proper RPM specifications.

12

ECHO APPROVED OPTIONAL ATTACHMENTS

W ARNING DANGER

• Use only ECHO approved attachments for Pro Attachment SeriesTM models. Serious injury may result from the use
of non-approved attachment combinations. Read and comply with all safety instructions listed in this manual and
attachment manual.

• ECHO, INC. will not be responsible for the failure of cutting devices, attachments, or accessories which have not
been tested and approved by ECHO for use with this Pro Attachment SeriesTM unit.

RECOMMENDED OPTIONAL ATTACHMENTS

• PAS Edger Model 99944200470

• PAS Cultivator Model 99944200510

• PAS Trimmer Model 99944200540

• PAS Hedge Clipper Model 99944200480

• PAS Power Pruner

TM

Model 99944200530

• PAS Pro Sweep

• PAS Pro Thatch

• PAS Articulating Hedge Clipper Mod el 99944200590

• PAS Rapid Loader

• PAS Brush Cutter Mod el 99944200600

TM

TM

TM

Model 99944200550
Model 99944200560

Model 99944200610

ASSEMBLY

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

13

POWER

Tools Required: None
Parts Required: Split Boom Attachment Assembly

1 . Set Power Head/Shaft Assembly on a level surface.

2 . Pull locator pin (A) out, and turn counter-clockwise 1/4 turn to lock-

out position.

3 . Carefully fit attachment drive shaft assembly into coupler (B) to

decal assembly line (C), making sure that the inner lower drive shaft
engages into the square upper drive shaft socket.

NOTE

Lower bearing housing and head assembly must be in line with the
engine.

4 . Rotate locator pin (A) 1/4 turn clockwise to engage lower shaft

hole. Insure locator pin is fully engaged by twisting lower drive
shaft. Locator pin should snap flush in coupler. Full engagement will
prevent further shaft rotation.

HEAD SHAFT/LOWER SHAFT ASSEMBLY

B

D

A

B

D

A

C

5 . Secure lower shaft assembly to coupler by tightening clamping

knob (D).

PLASTIC SHIELD INSTALLATION

(For Nylon Line Operation)

Tools Required: Screwdriver.
Parts Required: Plastic Shield, Shield Plate, three (3) 5 mm x 15 mm

screws.

NOTE

The plastic shield is for use with the Nylon Line Head only. Install
Metal Shield when using plastic or metal blades.

1. Snap the shield on the bottom of the bearing housing flange.
2 . Place shield plate on shield, align holes and install three (3) screws.

14

NYLON LINE HEAD INSTALLATION

Tools Required: Head Locking Tool
Parts Required: Nylon Line Head.

1 . Align locking hole in upper plate (B) with notch in edge of gear

housing and insert head locking tool (A).

2 . Remove plastic sleeve from P.T.O. shaft (C).
3 . Be sure upper plate (B) remains on P.T.O. shaft.
4 . Thread line head onto P.T.O. shaft by turning it counter clockwise

until head is tight against upper plate (B).

5 . Remove locking tool (B).

FRONT HANDLE INSTALLATION

Tools Required: Screwdriver.

Parts Required: Front Handle Assembly

A

C

B

1 . Assemble front handle on drive shaft, DO NOT tighten screws yet.

2 . Position front handle for comfortable operation and secure screws.

PRE - OPERATION

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

15

OPERATION

Preparing the Trimmer/Brush Cutter for Blade Use

WITH BLADES

WARNING DANGER

Blade use DEMANDS specific Brush Cutter configuration. Operation without specified shield and harness can result
in serious personal injury. Follow installation instructions included in optional kits.

Plastic and Nylon Blades Require:

"Blade Conversion Kit," P/N 99922200415
(metal shield [A], shoulder harness [B],
and Barrier Bar [C]).

A

C

Steel/Metal Blades Require:

SRM-2100SB "Combination Blade" and
"U-Handle Kit" P/N 99944200451 (D).
SRM-2400SB "Combination Blade"
and "U-Handle Kit" P/N 99944200521 (D).

B

D

Choosing the Correct Blade

WARNING DANGER

The type of Blade used MUST be matched to the type and size of material cut. An improper or dull blade can cause
serious personal injury. Blades MUST be sharp. Dull blades increase the chance of kick out and injury to yourself
and bystanders.

Plastic/Nylon Blades may be used where ever the nylon line head
is used. DO NOT use this blade for heavy weeds or brush!

16

8 Tooth Weed/Grass Blade P/N 69600120331 is designed for grass,
garden debris and thick weeds. DO NOT use this blade for brush or
heavy woody growth, 3/4" in. (19 mm) diameter or larger.

Brush/Clearing Blade P/N 69500120331 is designed for cutting brush
and woody growth up to 3" in. (76 mm) diameter.

Use Shoulder/Waist Harness P/N 99944200200 The Shoulder/Waist
Harness when used in a trimming operation with nylon line head
suspends the trimmer from the operator's shoulder and reduces operator
fatigue.

During blade operation, the same fatigue reduction is achieved. Safety
to the operator is also enhanced by preventing blade contact with the
operator's hands and feet by restricting trimmer movement.

NOTE

In case of Emergency, pull up on the Quick Release Collar to
disconnect the trimmer from the harness.

GRASS TRIMMER/BRUSH CUTTER

FUEL

Fuel Requirements

Gasoline - Use 89 Octane [ ] (mid grade or higher) gasoline known
to be good quality. Gasoline may contain up to 15% MTBE (methyl
tertiary-butyl ether). Gasohol containing methyl (wood) alcohol is NOT
approved.

Two Stroke Oil - A two-stroke engine oil meeting ISO-L-EGD (ISO/CD

13738) and J.A.S.O. FC Standards, must be used. Echo brand Premium
50:1 oil meets these standards. Engine problems due to inadequate
lubrication caused by failure to use an ISO-L-EGD and J.A.S.O. FC
certified oil, such as Echo Premium 50:1 Two-stroke Oil, will void the
two-stroke engine warranty. (Emission related parts only are covered
for two years, regardless of two-stroke oil used, per the statement listed
in the EPA Phase I/California Emission Defect Warranty Explanation.)

IMPORTANT

Echo Premium 2-Stroke Oil may be mixed at 50:1 ratio for applica­tion in all Echo engines sold in the past regardless of ratio speci­fied in those manuals.

Mixing Instructions

1 . Fill an approved fuel container with half of the required amount
of gasoline.
2 . Add 2-stroke oil to gasoline.
3 . Close container and shake to mix oil with gasoline.
4 . Add remaining gasoline and remix.
5 . Install fuel container cap and wipe any spilled fuel from container
and surrounding area.

Handling Fuel

R + M

2

OPERATOR'S MANUAL

IMPORTANT

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. Contact your ECHO dealer for

ordering information.

After Refueling

• Wipe any spilled fuel from the unit.

• Move at least 3 m (10 ft.) from refueling
location before starting.

After use

• DO NOT store a unit with fuel in its tank.
Leaks can occur. 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, air tight container. Store in a well

ventilated, unoccupied building, away from
sparks and flames. Do not store fuel longer
than 30 days.

IMPORTANT

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.

17

WARNING DANGER

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!

• NEVER refuel a unit with the engine running.

• DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks out
doors over bare ground.

• Securely tighten fuel cap after refueling.

• Inspect for fuel leakage. If fuel leakage is found, do not start or
operate unit until leakage is repaired.

IMPORTANT

Stored two-stroke fuel may separate.
ALWAYS shake fuel container thor­oughly before each use.

18

OPERATION

STARTING

COLD ENGINE

WARNING DANGER

The cutting attachment should not rotate at idle. If attachment
rotates, readjust carburetor according to "Carburetor Adjustment"
instructions in this manual or see your ECHO Dealer, otherwise
serious personal injury may result.

NOTE

Refer to the attachment Operator's Manual and Safety Manual (if
included) for proper and safe operating techniques.

All Models

1. Stop Switch
Move stop switch button (A) forward away from the STOP position.

2. Choke
Move choke (B) to “Cold Start” Position.

3. Primer
Pump primer bulb (C) until fuel is visible and flows freely in the clear
fuel tank return line. Pump bulb an additional 4 or 5 times.

A

B

W ARNING DANGER

Inspect starting area for hazards such as rocks, glass, debris etc.
which could be contacted by the cutting attachment when starting.
Keep helpers and bystanders at least 15 m (50 ft.) from starting area,
otherwise serious personal injury may result.

SRM-2100SB

B

SRM-2400SB

C

C

SRM-2100SB

4A. Recoil Starter

Lay the unit on a flat clear area. Firmly grasp rear handle grip
and throttle lockout with left hand and fully depress throttle
trigger to wide open position. Rapidly pull recoil starter handle/
rope (D) until engine fires (or maximum five [5] pulls).

5A. Choke

After engine fires (or five [5] pulls), move choke to “Run”
position. Hold throttle trigger fully depressed and pull recoil
starter handle/rope (D) until engine starts and runs. Release
throttle trigger and allow unit to warm up at idle for several
minutes.

SRM-2400SB

4B. Recoil Starter

Lay the unit on a flat clear area and pull the recoil starter
handle (D) until engine fires.

5B. Choke

Move the choke to the OPEN - RUN position. Restart engine if
necessary and allow to warm up running at idle for several
minutes.

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

SRM-2100SB

D

SRM-2400SB

19

All Models

NOTE

If engine does not start with choke in “Run” position after 5 pulls,
repeat instructions 4 (A/B) and 5 (A/B).

6 . After engine warm up, gradually depress throttle trigger to increase

engine RPM to operating speed.

STARTING WARM ENGINE

All Models

The starting procedures is the same as Cold Start except DO NOT close
the choke, and do not depress throttle trigger to wide-open position.

WARNING DANGER

The cutting attachment should not rotate at idle. If cutting attach­ment moves, readjust carburetor according to "Carburetor Adjust­ment" instructions in this manual or see your ECHO Dealer,
otherwise serious personal injury may result.

A

1. Stop Switch
Move stop switch button (A) forward away from the STOP position.

2. Primer
Pump primer bulb (C) until fuel is visible and flows freely in the clear
fuel tank return line. Pump bulb an additional 4 or 5 times.

C

D

20

3. Recoil Starter
Lay the unit on a flat clear area and pull the recoil starter handle (D)
until the engine fires.

NOTE

If engine does not start after 5 pulls, use Cold Start Procedure.

STOPPING ENGINE

1. Throttle
Release throttle, and allow engine to return to idle before shutting
engine off.

2. Stop Switch
Move stop switch button (A) backward to STOP position.

A

WARNING DANGER

If engine does not stop when stop switch is moved to STOP
position, close choke - COLD START position - to stall engine.
Have your ECHO dealer repair stop switch before using trimmer
again.

MAINTENANCE

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, you may want to take your unit to
an ECHO Service Dealer for maintenance. To help you decide whether you want to DO-IT-YOURSELF or have the ECHO
Dealer do it, each maintenance task has been graded. If a task is not listed, see your ECHO Dealer for repairs.

SKILL LEVELS

Level 1 = Easy to do. Most required tools come with unit.
Level 2 = Moderate difficulty. Some specialized tools may be required.
Level 3 = Experience required. Specialized tools are required. ECHO recommends

that the unit be returned to your ECHO dealer for service.

ECHO offers REPOWERTM Maintenance Kits and Parts to make your maintenance job easier. Below each task heading
are listed the various part numbers required for that task. See your ECHO dealer for these parts.

MAINTENANCE INTERV ALS

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

21

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22

AIR FIL TER

Level 1.

Tools required: Cleaning brush, 25 - 50 mm (1 or 2 in.) medium bristle

paint brush.

Parts required:

SRM-2100SB 90008 REPOWERTM AIR & FUEL FILTER KIT.
SRM-2400SB 90030 REPOWERTM AIR & FUEL FILTER KIT.

1 . Close choke (Cold Start Position). This prevents dirt from entering

the carburetor throat when the air filter is removed. Brush accumu­lated dirt from the air cleaner area.

2 . Remove the air cleaner cover. Clean and inspect the element for

damage. If element is fuel soaked and very dirty, replace.

SRM-2100SB

SHOWN

3 . If element can be cleaned and reused, be certain it:

•still fits the cavity in the air cleaner cover.

•is installed with the original side out.

NOTE

Carburetor adjustment may be needed after air filter cleaning/
replacement.

FUEL FILTER

Level 1.

Tools required: 200-250 mm ( 8 - 10 in.) length of wire with one end

bent into a hook, Clean rag, funnel, and an approved f
fuel container.

Parts required:

SRM-2100SB 90008 REPOWERTM AIR & FUEL FILTER KIT.
SRM-2400SB 90030 REPOWERTM AIR & FUEL FILTER KIT.

WARNING DANGER

Fuel is VERY flammable. Use extreme care when mixing, storing or
handling, otherwise serious personal injury may result.

1 . Use a clean rag to remove loose dirt from around fuel cap and

empty fuel tank.

2 . Use the “fuel line hook” to pull the fuel line and filter from the tank.

3 . Remove the filter from the line and install the new filter.

GRASS TRIMMER/BRUSH CUTTER

SPARK PLUG

Level 2.

Tools required: Scrench (combination socket wrench and screw

driver), Feeler gauge (preferably a wire gauge) ,
Brush.

Parts Required: Spark Plug, SRM -2100SB NGK BPM-7A

SRM-2400SB NGK BPM-7Y

1 . Remove spark plug and check for fouling, worn and rounded

center electrode.

2 . Clean the plug or replace with a new one. DO NOT sand blast to

clean. Remaining sand will damage engine.

3. Adjust spark plug gap by bending outer electrode.

4 . Tighten spark plug to 145-155 kg/cm (125-135 in. lb.).

OPERATOR'S MANUAL

0.65 mm

(0.026 in.)

23

COOLING SYSTEMS CLEANING

Level 2.

Tools required: Cross Head Screwdriver, 3 mm Hex Wrench, Pointed

Wood Stick, Cleaning brush 25 - 50 mm (1 or 2 in.)
medium bristle paint brush).

Parts Required: None if you are careful.

IMPORTANT

To maintain proper engine operating temperatures, cooling air must
pass freely through the cylinder fin area. This flow of air carries
combustion heat away from the engine.

Overheating and engine seizure can occur when:

• Air intakes are blocked, preventing cooling air from reaching the
cylinder.

• Dust and grass build up on the outside of the cylinder. This build up
insulates the engine and prevents the heat from leaving.

Removal of cooling passage blockages or cleaning of cooling fins is
considered “Normal Maintenance”. Any failure attributed to lack of
maintenance is not warranted.

A

1 . Remove spark plug lead and throttle linkage end from the carburetor

swivel.

2 . Remove the three screws that retain the engine cover (A). Two at the

top of the recoil starter, one in the arm rest. Lift the cover from the
engine.

24

3 . Use the wooden stick or brush to remove dirt form cylinder fins.

IMPORTANT

Do not use a metal scraper to remove dirt from the cylinder fins.

4 . Remove grass and leaves from the grid between the recoil starter and

fuel tank.

5. Assemble components in reverse order.

NOTE

When installing the engine cover, be certain the tab of the metal
deflector shield is in the slot of the engine cover.

EXHAUST SYSTEM

Spark Arrestor Screen

Level 2.

Tools required: Cross Head Screwdriver, 3 mm Hex Wrench, Soft

Metal Brush, Wooden Carbon Scraper.

Parts Required: Screen P/N 14586240630, Gasket P/N 14586642031
1 . Remove engine cover (A). See “Cleaning Cooling System” pages

26 & 27 for step by step instructions.

2 . Place piston at Top Dead Center (TDC) to prevent carbon/dirt from

entering cylinder.

3 . Remove spark arrestor screen cover (B), screen holder (C), gasket

(D) and screen (E) from muffler body.

4 . Clean carbon deposits from muffler components.

5 . Replace screen if it is cracked, plugged or has holes burned through.

6. Assemble components in reverse order

NOTE

When installing the engine cover, be certain the tab of the metal
deflector shield is in the slot of the engine cover.

E

D

C

B

GRASS TRIMMER/BRUSH CUTTER

CARBURETOR ADJUSTMENT

SRM-2100SB Emission Models

Level 2.

Tools required: Screwdriver, Tachometer (ECHO P/N 99051130017)
Parts required: None.

NOTE

Every unit is run at the factory and the carburetor is set in compli­ance with emission regulations. In addition, the carburetor is
equipped with HI and LO needle adjustment limiters that prevent
settings outside acceptable limits.

1 . Before adjusting the carburetor, clean or replace the air filter and

spark arrester screen.

OPERATOR'S MANUAL

25

2 . Trimmer line must be extended to the cut-off knife.

3 . Start engine and run for several minutes to reach operating tempera-

ture.

4 . Stop engine. Turn HI speed needle (C) CCW (counter clockwise) to

stop. Turn LO speed needle (B) midway between full CCW and CW
(clockwise) stops.

5 . Idle Speed Adjustment.

• Start engine and turn “idle” speed adjustment screw (A) CW
until the cutting attachment begins to turn, then turn the screw
CCW until cutting attachment stops turning. Turn screw CCW
an additional 1/4 turn.

6 . Accelerate to full throttle for 2-3 seconds to clear excess fuel from

engine then return to idle. Accelerate to full throttle to check for
smooth transition from idle to full throttle. If engine hesitates, turn
LO needle (B) CCW an additional 1/8 turn and repeat acceleration.
Continue adjusting until smooth acceleration results.

7 . Check HI speed RPM at W.O.T. (Wide Open Throttle). HI speed

RPM should be set to specifications found on page 11 "Specifica­tions" of this manual.

C

A

SRM-2100SB

C

B

8 . Check idle speed and reset if necessary. If a tachometer is available,

idle speed should be set to the specification found on page 11
"Specifications" of this manual.

W ARNING DANGER

When carburetor adjustment is completed, the cutting attachment
should not turn at idle, otherwise serious personal injury may result.

26

CARBURETOR ADJUSTMENT

SRM-2400SB Emission Models

Level 2.

Tools required: Screwdriver, Tachometer (ECHO P/N 99051130017).
Parts required: None.

NOTE

Every unit is run at the factory and the carburetor is set in compli­ance with emission regulations. This carburetor does not have
acceleration and high speed adjustment needles. Do not attempt to
use carburetor adjustment procedures provided in the Warranty/

Emissions Booklet.

1 . Check idle speed and reset if necessary. If a tachometer is available,

idle speed screw (A) should be set to the specifications found on
page 11 "Specifications" of this manual. Turn idle screw (A)
clockwise to increase idle speed; counter clockwise to decrease idle
speed.

W ARNING DANGER

When carburetor adjustment is completed, the cutting attachment
should not turn at idle, otherwise serious personal injury may result.

SRM-2400SB

A

LUBRICA TION

Level 1.

Tools Required: 8 mm Open End Wrench, Screwdriver, Clean Rag
Parts Required: ECHO® LUBETM 8 oz. (P/N 91014) or Lithium Base

Grease.

Gear Housing

1 . Clean all loose debris from gear box.

2 . Remove plug (A) and check level of grease.

3 . Add grease if necessary, DO NOT over fill.

A

GRASS TRIMMER/BRUSH CUTTER

Drive Shaft (Lower)

IMPORTANT

Lower and upper drive shaft
ture automotive grease every 25 hours of operation, otherwise
drive shaft assembly overheating and failure can result.

1 . Loosen two (2) screws (A) and remove center locating screw (B).

Pull gear box and shield from drive shaft housing.

2 . Pull flexible cable from the drive shaft housing, wipe clean and

re-coat with a thin coating [15 ml (1/2 oz.)] of ECHO

3 . Slide the flexible cable back in the drive housing. DO NOT get

dirt on the flex cable.

4. Install the gear housing and shield assembly.

must be lubricated with high tempera-

LUBETM.

®

OPERATOR'S MANUAL

B

A

27

Drive Shaft (Upper)

1 . Remove coupler from upper drive shaft assembly by loosening

clamping screw (C) and removing set screw (D).

2 . Remove upper flex drive cable, wipe clean and apply a thin coating

15 ml (1/2 oz.) of ECHO® LUBETM.

3 . Install flex drive cable. Make sure that the flex cable engages into the

clutch mount and also into the coupler mount.

4 . Slide coupler on upper drive shaft until fully seated, and align set

screw hole in coupling with hole in upper drive shaft.

5 . Install and tighten set screw (D), and tighten clamping screw (C).

D

C

28

NYLON LINE REPLACEMENT

Level 1.

Tools required: Head locking tool (if head is to be removed)

Parts Required: ECHO 0.095" Nylon Trimmer Line 6m (20 ft.) long.

1. Shut engine off. Lay unit on the ground with head assembly up.

2 . Hold drum (A) and turn spool (B) CW (clockwise) until it stops.

Pull spool from drum. DO NOT push in on spool when turning.

3 . Use one piece of new nylon line (C) 6m (20 ft.) long and thread

through the molded loop (D) on the spool. Pull line tight and
adjust so one end is 15 cm (6 in.) longer than the other.

4 . Hold the spool, opening toward you. Place index finger between

the two strands and wind line, tightly and evenly, in direction of
arrow marked "CC".

5 . Stop when approximately 15-20 cm (6-8 in.) line (C) remains and

place ends of line in notches (E) in spool (B).

B

6. Feed ends of line through housing eyelets (F) and place spool (B)
over drive (G). Align pegs (H) on drive with notches in spool and
push spool into drum.

7 . Pull on both lines until they come free from notches (E) in spool.

8 . Hold drum (A) firmly and turn spool (B) CCW (counterclockwise)

until it stops. DO NOT push in on spool when turning.

9 . Pull both lines out and trim to cut-off knife length.

B

A

GRASS TRIMMER/BRUSH CUTTER

SHARPENING METAL BLADES

Three styles of metal blades are approved for use on the ECHO Brush
Cutter. The 8-tooth blade can be sharpened during normal maintenance.
The clearing blade and 80 tooth blade require professional service.

Before sharpening, CLOSELY inspect blade for cracks (look at the
bottom of each tooth and the center mounting hole closely), missing
teeth and bending. If ANY of these problems are discovered, replace
the blade.

When sharpening a blade, always remove the same amount of materials
from each tooth to maintain balance. A blade that is not balanced will
cause unsafe handling due to vibration and can result in blade failure.

8-tooth Blade

Tool required: Flat file (preferred). Electric grinder if special care is
used. Round (rat tail) file for gullet (radius).

OPERATOR'S MANUAL

29

1 . File each tooth at a 30 degree angle a specific number of times,

eg. 4 strokes per tooth. Work your way around the blade until
all teeth are sharp.

2 . DO NOT file the 'gullet' (radius) of the tooth with the flat file.

The radius must remain. A sharp corner will lead to a crack and
blade failure.

IMPORTANT

If an electric grinder is used, use care not to overheat teeth, do not
allow tips/tooth to glow red or turn blue. DO NOT place blade in
cooling water. This will change the temper of the blade and could
result in blade failure.

3. After sharpening teeth, check each tooth radius for evidence of a
square (sharp) corner. Use the round (rat tail) file to renew the
radius.

30

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WARNING DANGER

Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition spark by grounding
spark plug against cylinder, otherwise serious personal injury may result.

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

STORAGE

Long Term Storage (over 30 days)

W ARNING DANGER

During operation the muffler or catalytic muffler and surrounding cover become hot. Always keep exhaust area clear
of flammable debris during transportation or when storing, otherwise serious property damage or personal injury may
result.

Do not store your unit for a prolonged period of time (30 days or longer) without performing protective storage mainte­nance which includes the following:

1 . Store unit in a dry, dust free place, out of the reach of children.

31

W ARNING DANGER

Do not store in enclosure where fuel fumes may accumulate or reach an open flame or spark.

2. Place the stop switch in the "OFF" position.

3 . Remove accumulation of grease, oil, dirt and debris

from exterior of unit.

4 . Perform all periodic lubrication and services that are

required.

5. Tighten all the screws and nuts.

6. Drain the fuel tank completely and pull the recoil

starter handle several times to remove fuel from the
carburetor.

7 . Remove the spark plug and pour 7 cc (1/4 oz.) (1/2

tablespoon) of fresh, clean, two-stroke engine oil into
the cylinder through the spark plug hole.

A. Place a clean cloth over the spark plug hole.

B . Pull the recoil starter handle 2-3 times to distribute

the oil inside the engine.

C. Observe the piston location through the spark plug

hole. Pull the recoil starter handle slowly until the
piston reaches the top of it's travel and leave it
there.

8. Install the spark plug (do not connect spark plug
cable).

SERVICING INFORMATION

P ARTS

Genuine ECHO Parts and ECHO REPOWER™ 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. _____________ SN. ____________

DEALER?

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. 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 you may call the ECHO
Consumer Product Support Department at 1-800-673-1558 from 8:30 am
to 4:30 pm (Central Standard Time) Monday through Friday. Before
calling, please know the model and serial number of your unit to help
your Consumer Product Support Representative.

1-800-432-ECHO

www.echo-usa.com

CONSUMER PRODUCT

1-800-673-1558

8:30 - 4:30 Mon - Fri C.S.T.

WARRANTY REGISTRATION

You may register your Echo equipment using the warranty registration
card or register on-line at www.echo-usa.com. Registering provides a
direct link between you and ECHO if we find it necessary to contact
you.

ADDITIONAL OR REPLACEMENT MANUALS

Safety Manuals in English/Spanish or English/French are available, free of charge, from your ECHO dealer or at
www.echo-usa.com.
Operator's and Parts Manuals are available by:

• Downloading free from www.echo-usa.com

• Purchasing from your Echo Dealer.

• Sending a check or money order for $2.00 per Parts Catalog or $1.50 per Operator's Manual made payable to ECHO,
INCORPORATED. State on a sheet of paper the model number and serial number of the ECHO unit you have, part
number of the manual (if known), your name and address and mail to address below.

Safety Videos are available from your Echo dealer. A $5.00 shipping charge will be required for each video.

Call

or

SUPPORT

Available Parts Catalog

SRM-2100SB TYPE 1E S/N 001001 & UP PART NUMBER 99922202870
SRM-2400SB TYPE 1E S/N 563000 & UP PART NUMBER 99922202871

ECHO, INCORPORATED

400 OAKWOOD ROAD

LAKE ZURICH, IL 60047-1564

www.echo-usa.com

SUPPLEMENT TO OPERATOR'S MANUAL
PART NUMBER X7532277103 (89861056733)
FOR MODEL: SRM-2100SB, SN 520301 & UP

DESCRIPTION Page 7

EMISSION CONTROL

IMPORTANT ENGINE INFORMATION

ENGINE FAMIL Y : 2EHXS.0214RA DISPLACEMENT : 21.2cc
EMISSION COMPLIANCE PERIOD : 300 HRS.
THIS ENGINE MEETS U.S. EPA PHASE 2 EMISSION
REGULATIONS FOR SMALL NONROAD ENGINES. REFER
TO OWNER'S MANUAL FOR MAINTENANCE SPECIFICA­TIONS AND ADJUSTMENTS.

Please use this Operator Manual Supplement when assembling and

maintaining your SRM-2100SB

PRODUCT EMISSION DURABILITY

The 300 hour emission durability compliance period is the time span selected by
the manufacturer certifying the engine emissions output meets applicable U.S.
EPA emissions regulations, provided that approved maintenance procedures

are followed as listed in the Maintenance Section of this manual.

PRE-OPERATION Page 17

FUEL

Two Stroke Oil - A two-stroke engine oil meeting ISO-L-EGD (ISO/CD 13738) and J.A.S.O. FC Standards, must be used. Echo brand
Premium 50:1 oil meets these standards. Engine problems due to inadequate lubrication caused by failure to use an ISO-L-EGD and
J.A.S.O. FC certified oil, such as Echo Premium 50:1 Two-stroke Oil, will void the two-stroke engine warranty. (Emission related parts
only are covered for two years, regardless of two-stroke oil used, per the statement listed in the EPA Phase II Defect Warranty Explana­tion.)

MAINTENANCE

CARBURETOR

Emission Models

ADJUSTMENT Page 25

NOTE

Every unit is run at the factory and the carburetor is set in compliance with EPA Phase II Emission Regulations. In addition, the
carburetor is equipped with HI and LO needle adjustment limiters that prevent settings outside acceptable limits.

SUPLEMENTO DEL MANUAL DEL OPERADOR

NÚMERO DE PIEZA X7532277103 (89861056733)

PARA LOS MODELO: SRM-2100SB S/N 520301 y Superior

Utilice por favor este suplemento manual del operador al ensamblar y manteniendo su SRM-2100SB

DESCRIPCIÓN Page 7

CONTROL DE EMISIONES

INFORMACIÓN IMPORTANTE SOBRE EL MOTOR

FAMILIA DE MOTORES: 2EHXS.0214RA CILINDRADA: 21.2 cc
PERIODO DE LA CONFORMIDAD PARA LA EMISIONES : 300
HORAS.
ESTE MOTOR RESUELVE LOS E.E.U.U. REGULACIONES DE
LA EMISIÓN DE EPA PH2 PARA EL MOTOR PEQUEÑO DEL
NONROAD. CONSULTE EN EL MANUAL DEL PROPIETARIO
LAS ESPECIFICACIONES Y AJUSTES DE MANTENIMIENTO.

El período de durabilidad de comformidad para la emisiones de 300 horas
es el tiempo seleccionado por el fabricante certificando que las emisiones
de salida del motor cumplen con las regulaciones de emisiones aplicables
de EPA de EE,UU, siempre que se sigan los procedimientos de
mantenimiento aprobados según se indican en la sección de

DURABILIDAD DE LAS EMISIONES DEL PRODUCTO

mantenimiento de este manual.

OPERACIÓN PRELIMINAR Page 17

COMBUSTIBLE

Aceite de dos tiempos - Se debe usar un aceite de motor de dos tiempos que cumpla con las normas ISO-L-EGD (ISO/CD. 13738) y
J.A.S.O. FC. El aceite de calidad Echo 50:1 cumple con estas normas. Los problemas del motor debidos a una lubricación inadecuada
por no usar un aceite certificado ISO-L-EGD y J.A.S.O.FC, tal como aceite de dos tiempos 50:1 de calidad óptima de Echo, anulará la
garantía del motor de dos tiempos. (Las piezas relacionadas con las emisiones sólo están cubiertas durante dos años, sea cual sea el
aceite de dos tiempos usado, según la declaración indicada en la explicación de garantía de defectos de emisiones de la Fase II de la
EPA).

MANTENIMIENTO Page 25

AJUSTE DEL CARBURADOR

NOTA

Todas las unidades se hacen funcionar en fábrica y el carburador se ajusta en cumplimiento con las regulaciones de emisiones de
EPA Fase II. Este carburador no tiene agujas de ajuste de aceleración y alta velocidad.

99922203534

SUP22203534

1

01/02