Echo srm-251e, srm-251 Operator's Manual

Grass T rimmer/Brush Cutter

Operator's Manual

MODEL SRM - 251

SRM - 251E

X7502021603

W ARNING DANGER

Read rules for safe operation and instructions carefully. ECHO provides an Operator's
Manual and a Safety Manual. Both must be read and understood for proper and safe
operation.

X750007283
03/06

2

INTRODUCTION

Welcome to the ECHO family. This ECHO product was designed and manufactured to provide long life and on-the-job
dependability. Read and understand this manual. You will find it easy to use and full of helpful operating tips and
SAFETY messages.

THE OPERATOR’S MANUAL

Read and understand this manual before operation. Keep it in a safe
place for future reference. It contains specifications and information for
operation, starting, stopping, maintenance, storage, and assembly
specific to this product.

THE SAFETY MANUAL

Read and understand this manual before operation. Keep it in a safe
place for future reference. It explains possible hazards involved with the
use of this product and what measures you should take to make their
use safer.

TABLE OF CONTENTS

Introduction .................................................................... 2

- The Operator's Manual............................................. 2

- The Safety manual.................................................... 2

Safety .............................................................................. 3

- Manual Safety Symbols and Important Information 3

- International Symbols.............................................. 3

- Personal Condition and Safety Equipment .............. 4

- Equipment Check ..................................................... 6

Emission Control............................................................. 8

Description ..................................................................... 7

Contents ......................................................................... 9

Assembly ...................................................................... 10

- Plastic Shield Installation....................................... 10

- Nylon Head Installation......................................... 10

- Front Handle Installation ....................................... 1 1

Operation ...................................................................... 12

- Fuel ........................................................................ 12

- Starting Cold Engine .............................................. 1 3

- Starting Warm Engine............................................ 14

- Stopping Engine .................................................... 14

Copyright© 2006 By Echo, Incorporated
All Rights Reserved.

Maintenance ................................................................. 15

- Skill Levels ............................................................. 15

- Maintenance Intervals ........................................... 15

- Air Filter ................................................................. 16

- Fuel Filter ............................................................... 16

- Spark Plug.............................................................. 17

- Cooling System...................................................... 1 7

- Exhaust System...................................................... 1 8

- Carburetor Adjustment .......................................... 1 9

- Lubrication............................................................. 21

- Nylon Line Replacement ........................................ 22

Troubleshooting ........................................................... 23

Storage.......................................................................... 24

Specifications................................................................ 25

Servicing Information.................................................... 28

- Parts/Serial Number ............................................... 28

- ECHO Consumer Product Support......................... 2 8

- Service ................................................................... 28

- Warranty Card ....................................................... 28

- Additional or Replacement Manuals ..................... 2 8

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.

SAFETY

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

3

MANUAL

SAFETY SYMBOLS AND IMPORT ANT 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.

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.

INTERNA TIONAL SYMBOLS

DESCRIPTION

"WARNING, SEE

OPERATOR'S

MANUAL

Wear eye, ear

and head

protection

Wear hand and
foot protection

Safety/Alert

SYMBOLSYMBOL

Keep bystanders and helpers

away 15 m (50 ft.).

DESCRIPTION

Hot

Surface

Finger Severing

DO NOT allow

flames or sparks

near fuel.

DO NOT smoke

near fuel.

SYMBOL DESCRIPTION

Emergency

Stop

Carburetor

Adjustment

- High speed
mixture

Carburetor

Adjustment

- Idle speed

Carburetor

Adjustment

- Low speed
mixture

Choke Control

"Run"

Position

(Choke Open)

SYMBOL

DESCRIPTION

Fuel and oil

mixture

Primer

Bulb

Ignition

ON/

OFF

Do not use

blades. String

line only

Choke Control

"Cold Start"

Position

(Choke Closed)

4

PERSONAL CONDITION AND SAFETY EQUIPMENT

W ARNING DANGER

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

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

Hand Protection

Wear no-slip, heavy-duty work gloves to improve your grip on the handle. 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, SCARFS, JEWELRY.
Wear protective hair covering to contain long hair.
Wear sturdy work shoes with nonskid soles;

• DO NOT WEAR OPEN TOED SHOES,

• DO NOT OPERATE UNIT BAREFOOTED.

Hot Humid Weather

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.

Extended Operation/Extreme Conditions

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.

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

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 exercise 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.

5

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.

Read the Manuals

• Provide all users of this equipment with the Operator’s Manual and
Safety Manual for instructions on Safe Operation.

Clear the Work Area

• Spectators and fellow workers must be warned, and children and
animals prevented from coming nearer than 15 m (50 ft.) while the
unit is in use.

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.

Avoid Hot Surfaces

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

6

EQUIPMENT CHECK

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 is
securely 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.

EMISSION CONTROL

EPA Phase 2 SRM-251E

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

IMPORTANT ENGINE INFORMATION

ENGINE FAMILY: 6EHXS.0254ED DISPLACEMENT: 25.4 CC
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.

California Tier 2 SRM-251

The emission control system for these engines is EM/
TWC (Engine Modification and Catalyst).

ENGINE FAMILY: 6EHXS.0254KE DISPLACEMENT: 25.4 cc
EMISSION COMPLIANCE PERIOD: 300 Hours
THIS ENGINE MEETS U.S. EPA PH2 AND 2005 - 2006
CALIFORNIA EXH EMISSION REGULATIONS FOR SORE
REFER TO OWNER'S MANUAL FOR MAINTENANCE SPECIFI­CATIONS AND ADJUSTMENTS.

IMPORTANT ENGINE INFORMATION

S.

An Emission Control Label is located on the engine. (This is an EXAMPLE ONLY, information on label varies by engine
FAMILY).

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 emissions regulations, provided that approved maintenance procedures are
followed as listed in the Maintenance Section of this manual.

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

DESCRIPTION

Locate these safety decals on your unit. 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.

7

P/N 89016054130

6

16

18

17

15

14

P/N 89022809560

9

13

5

11

12

P/N X505001930

4

Hot Decal (near muffler)

P/N 89016006361

1

3

2

7

Shaft Decals

P/N 89022809560

P/N 89016054130

8

10

P/N X505001930

8

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

2. GRIP - Rear (right hand) handle.

3. THROTTLE TRIGGER LOCKOUT - This lever must be held during starting. 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. FRONT HANDLE - The Front (loop) handle is loosely assembled to the Drive Shaft assembly and must be positioned

for proper cutting attitude and operator comfort.

6. NYLON CUTTER HEAD - 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.

7. CUT-OFF KNIFE - Automatically trims line to the correct length: 5" 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.

8. 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. Mounts on the Gear Housing Assembly just
above the cutting attachment. Helps protect the operator by deflecting debris produced during the trimming operation.

9. DRIVE SHAFT ASSEMBLY - Includes the Rear (right hand) Handle assembly, Gear Housing assembly, Front (loop,

left hand) Handle assembly, steel drive shaft and Safety Decal.

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

best operating technique.

11. SPARK ARRESTOR - CATALYTIC MUFFLER / MUFFLER -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.

12. FUEL TANK - Contains fuel and fuel filter.

13. I-30 RECOIL STARTER/HANDLE - i30 spring-assisted recoil starter requires 30% less pulling force than standard

recoil starter. Pull 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.

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

15. CHOKE - The choke control is located on the top of the air filter case. Move choke lever to "Cold Start" ( ) to

close choke for cold start. Move choke lever to "Run" ( ) position to open choke.

16. AIR CLEANER - Contains replaceable filter element.

17. PURGE BULB - Pumping purge bulb before starting engine draws fresh fuel from the fuel tank, purging air from the

carburetor. Pump purge bulb until fuel is visible and flows freely in the clear fuel tank return line. Pump purge bulb
an additional 4 or 5 times.

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

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

CONTENTS

The ECHO product you purchased has been partially assembled for your convenience. Due to packaging restrictions,
installation of the plastic debris shield, nylon line head, and positioning of the front handle 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.

* Some units may be factory pre-assembled. No assembly tools are needed and the nylon line head, plastic debris shield,

and mounting hardware, shown in the contents list, are pre-assembled to the unit. Only the front handle may need to be
re-positioned for comfortable operation.

______1 - Power Head / Drive Shaft Assembly
______1 - Operator's Manual
______1 - Safety Manual
______1 - Warranty Registration Card
______1 - Limited Warranty Statement
______1 - Safety Glasses
______1 - Echo Power Blend TM 2-stroke oil sample

* ___ 1 - Nylon Trimmer Head
* ___ 1 - T-wrench 17x19, P/N 89541008030
* ___ 1 - Locking tool, P/N 89751801131
* ___ 1 - Plastic shield
* ___ 1 - Shield plate

* ___ 3 - 5mm x 16mm screws (shield mtg.)

9

10

ASSEMBLY

Tools Required: Screwdriver, Head Locking Tool, 17x19mm T-Wrench

Parts Required: Plastic Shield, Shield Plate, three (3) 5mm x 16mm

screws, Nylon Line Head

PLASTIC SHIELD INSTALLATION

(For Nylon Line Operation)

NOTE

The plastic shield is for use with the Nylon Line Head only.

1 . Remove plastic sleeve and upper plate (A) from PTO shaft.

2. Install the shield on the bottom of the bearing housing flange.

3 . Place shield plate (B) on shield, align holes and install three (3)

5x16 mm screws.

4 . Install upper plate (A).

NYLON LINE HEAD INSTALLATION

1. Align hole in upper plate with notch in edge of gear housing and
insert head locking tool (C). Remove plastic sleevefrom PTO shaft.

2 . Be sure upper plate (A) remains on PTO shaft.

3 . Thread line head onto PTO shaft by turning it counter clockwise

until head is tight against upper plate.

4 . Remove locking tool (C).

B

A

C

GRASS TRIMMER/BRUSH CUTTER

FRONT HANDLE INSTALLATION

NOTE

Label shows minimum spacing for front handle location.

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

OPERATOR'S MANUAL

MIN

SPACING

11

12

OPERATION

FUEL

NOTICE: Use of unmixed, improperly mixed, or fuel older than 90
days, (stale fuel), may cause hard starting, poor performance, or
severe engine damage and void the product warranty. Read and
follow instructions in the Storage section of this manual.

Fuel Requirements

Gasoline - Use 89 Octane [R+M/2] (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

Power Blend TM Universal 2-Stroke 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 Power
Blend TM, 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 Emission Defect Warranty Explanation.)

IMPORTANT

Echo premium Power Blend TM Universal 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.

Handling Fuel

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1
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5

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.

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.

6.2

2.5

31

4
8

02

08

061

004

After use

• DO NOT store a unit with fuel in its
tank. Leaks can occur. Return unused
fuel to an approved fuel storage
container.

W ARNING

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 3m (10 ft.) from refueling location before starting
the engine.

DANGER

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.

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.

IMPORTANT

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

GRASS TRIMMER/BRUSH CUTTER

STARTING COLD ENGINE

W ARNING DANGER

The attachment will operate immediately when the engine starts and
could result in loss of control and possible serious injury. Keep
movable parts of the attachment off the ground and away from
objects that could become entangled or thrown.

1. Stop Switch

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

OPERATOR'S MANUAL

A

13

2. Choke

Move choke lever (B) to Cold Start Position ( ).

3. Purge Bulb

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

4. Recoil Starter

Lay the unit on a flat area and keep movable attachment parts clear
of all obstacles. Firmly grasp right hand grip and throttle trigger
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).

5. Choke

After engine fires (or 5 pulls), move choke lever back to Run ( )
position. Hold throttle trigger and throttle trigger lockout fully

depressed, and pull recoil starter starter handle/rope until engine
starts and runs. Allow engine to run at partial throttle for approxi­mately 10 seconds. Release throttle trigger, and allow unit to warm
up at idle for several minutes.

C

B

D

NOTE

If engine does not start with choke in “Run” position after 5 pulls,
repeat instructions.

6. Throttle Trigger

After engine warm-up, gradually depress throttle trigger to increase
engine RPM to operating speed.

14

STARTING WARM ENGINE

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

W ARNING DANGER

The attachment should not move at idle, otherwise serious personal
injury may result.

NOTE

If attachment moves, readjust carburetor according to “Carburetor
Adjustment” instructions in this manual or see your ECHO Dealer.

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

A

C

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

3. Recoil Starter
Lay the unit on a flat area and keep movable attachment parts clear
of all obstacles. Rapidly pull recoil starter handle/rope (D) until
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 off
engine.

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

D

A

W ARNING 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.

B

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

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 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. Just below each task
heading are listed the various part numbers required for that task. See your ECHO dealer for these parts.

MAINTENANCE INTERVALS

15

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16

AIR FIL TER

Level 1.

Tools Required: Cleaning brush 25 or 50 mm (1 or 2 in.)

Parts Required: 90008 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 air cleaner area.

2 . Remove air filter cover. Brush dirt from inside cover.

3 . Remove air filter and lightly brush debris from filter. Replace filter if it

is damaged, fuel soaked, very dirty, or the rubber sealing edges are
deformed.

4 . If filter can be reused, be certain it:

• Fits tightly in the air filter cavity.

• Is installed with the original side out.

5 . Install air filter cover.

FUEL FIL TER

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 fuel
container.

Parts Required: 90008 REPOWERTM AIR & FUEL FILTER KIT.

W ARNING DANGER

Fuel is VERY flammable. Use extreme care when mixing, storing or
handling.

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: T-Wrench, feeler gauge, soft metal brush.

Parts Required: REPOWERTM Tune-Up Kit P/N 90074

IMPORTANT

Use only NGK BPM-8Y spark plug (BPMR-8Y in Canada) otherwise
severe engine damage may occur.

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 150-170 kg/cm (130-150 in. lb.).

OPERATOR'S MANUAL

0.65 mm

(0.026 in.)

17

COOLING SYSTEM

Level 2.

Tools Required: 3 & 4 mm Hex Wrench, cleaning brush, 25 or 50 mm

(1 or 2 in.)

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.

18

1 . Remove spark plug lead (A).

2 . Remove air filter cover (B).

3 . Remove one (1) muffler cover screw and muffler cover (C).

4 . Remove two (2) screws and engine cover (D).

IMPORTANT

DO NOT use a metal scraper to remove dirt from the cylinder fins.

5 . Use brush to remove dirt from the cylinder fins.

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

fuel tank.

7. Assemble components in reverse order.

A

B

C

D

EXHAUST SYSTEM

Spark Arrestor Screen

Level 2.

Tools Required: Cross Head Screwdriver, Soft Metal Brush,

4 mm Hex Wrench
Parts Required: Spark Arrestor Screen, Gasket
1 . Remove spark plug lead.
2 . Remove one (1) muffler cover screw and muffler cover.
3 . Place piston at Top Dead Center (TDC) to prevent carbon/dirt from

entering cylinder.

4 . Remove spark arrestor screen cover (A), gasket (B) and screen (C)

from muffler body.

5 . Clean carbon deposits from screen and muffler components.

NOTE

When cleaning carbon deposits, be careful not to damage the
catalytic element inside muffler.

SRM-251E

SRM-251

C

C

B

A

B

A

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

7. Assemble components in reverse order.

GRASS TRIMMER/BRUSH CUTTER

Cylinder Exhaust Port

Level 3.

IMPORTANT

The cylinder exhaust port must be inspected and cleaned of excess
carbon every 3 months or 90 hours of operation in order to maintain
this engine within the emissions durability period. ECHO strongly
recommends that you return your unit to your ECHO dealer for this
important maintenance service.

CARBURETOR ADJUSTMENT

Engine Break-In

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.

OPERATOR'S MANUAL

19

High Altitude Adjustment

High altitude adjustment is not required for proper operation of this
engine.

Level 2.

Tools required: Screwdriver, tachometer (Echo P/N 99051130017)

Parts required: None.

NOTE

Do not adjust carburetor unless necessary. If you have difficulty,
see your ECHO dealer.

Adjustment Screws

Idle Speed (A) Controls throttle opening at idle.

Low (LO) Speed (B) Controls amount of fuel at low speed and

supplementary fuel for smooth progression from
idle to high speed.

High (HI) Speed (C) Controls amount of fuel at full throttle

B

C

A

20

Before Adjustment

Check that:

• Air filter is clean and properly installed.

• Spark arrestor screen and muffler are free of carbon.

• Nylon line head with lines trimmed to 8 in. is installed.

Initial Adjustment

1 . With engine off, turn HI speed screw (C) counterclockwise to stop.

2 . Turn LO speed screw (B) midway between stops.

3 . Turn idle screw (A) until tip of screw just touches throttle plate; then

turn three (3) turns clockwise.

Final Adjustment

IMPORTANT

Limiter caps prevent exceeding emission limits and over rich
adjustment, but not over lean adjustment, which can cause engine
failure: Do not exceed recommended HI speed engine R.P.M.
during operation, or for long periods during adjustment.

1 . Start engine, run at idle for one minute.

2 . Complete warm up by running at full throttle for 5 minutes, operating

choke twice to clear air from carburetor chambers.

3 . Run at idle and accelerate to check for smooth transition from idle to

high speed; if engine hesitates, turn LO speed screw (B) counter­clockwise 1/8th of a turn at a time until acceleration is smooth.

4. Use a tachometer to adjust idle speed to specifications found on

page 25.

B

C

A

GRASS TRIMMER/BRUSH CUTTER

LUBRICA TION

Level 1.

Tools required: 8 & 13 mm Open End Wrench, Cross Head

Screwdriver, Clean rag, Grease gun P/N 91016

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.

OPERATOR'S MANUAL

A

A

21

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

Drive Shaft

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

Pull gear box and shield from drive shaft housing.

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

recoat with a thin coating [15 ml (1/2 oz.)] of grease.

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.

IMPORTANT

Flat edge of washers (D) must be against drive shaft.

D

B

C

A

22

NYLON LINE REPLACEMENT

Level 1.

Parts Required: ECHO 2.4mm (0.095 in.) Nylon Trimmer Line 12m (40

feet [two 20 ft. sections])

Echomatic Pro Trimmer Head

1 . Do not push spool in. Hold drum and turn spool clockwise until

peg clicks and disappears from hole. Pull spool out of drum.

2 . Place ends of two 20 ft. x .095 in. CrossfireTM trimmer lines into

holes in spool, one on each side of barrier.

3. Wind both lines tightly and evenly (one on each side of barrier)
in the direction of arrow on bottom of spool.

4 . Place ends of lines into notches in spool, leaving 6 in. protruding.

5 . Feed ends of line outward through eyelets in drum.

6 . Turn inner drive so that pegs in drive align with grooves in

spool, and push spool into drum

7 . Hold spool and drum securely with one hand, and pull each line

to disengage from notches.

8 . Hold drum and twist spool counter clockwise until peg clicks into

hole.

9 . Trim lines to 8 in. length.

TROUBLESHOOTING

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GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

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23

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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 near cylinder plug hole, otherwise serious personal injury may result.

24

STORAGE

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.

Long Term Storage (over 30 days)

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.

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 "STOP" 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.) 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 handle slowly until the
piston reaches the top of its travel and leave it
there.

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

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

SPECIFICATIONS

MODELS ---------------------------------------------------SRM-251, SRM-251E

Length------------------------------------------------------- 1800 mm (70.9 in.)
Width--------------------------------------------------------245 mm (9.65 in.)
Height ------------------------------------------------------- 330 mm (13.0 in.)
Weight (dry) w/Cutter Head (SRM-251) ---------------- 5.52 kg (12.2 lb.)
Weight (dry) w/Cutter Head (SRM-251E) ---------------5.42 kg (11.9 lb.)
Engine Type ------------------------------------------------ Air cooled, two-stroke, single cylinder gasoline engine
Bore---------------------------------------------------------- 34.0 mm (1.34 in.)
Stroke--------------------------------------------------------28.0 mm (1.10 in.)
Displacement -----------------------------------------------25.4 cc (1.55 cu. in.)
Exhaust (SRM-251) ---------------------------------------- Spark Arrestor Muffler with catalyst
Exhaust (SRM-251E) ---------------------------------------Spark Arrestor Muffler
Carburetor -------------------------------------------------- Zama diaphragm model w/purge pump
Ignition System -------------------------------------------- Flywheel magneto, capacitor discharge ignition
Spark Plug -------------------------------------------------- NGK BPM-8Y (Gap 0.65 mm (0.026 in.)
Fuel ----------------------------------------------------------Mixed (Gasoline and Two-stroke Oil)
Fuel/Oil Ratio -----------------------------------------------50:1 two-stroke air cooled engine oil
Gasoline ----------------------------------------------------- 89 Octane unleaded. DO NOT use fuel containing methyl alcohol,

more than 10% ethyl alcohol or 15% MTBE.
Oil------------------------------------------------------------ Power Blend TM Premium Universal 2-Stroke Oil
Fuel Tank Capacity ----------------------------------------0.40 lit. (13.5 US fl. oz.)
Recoil Starter System --------------------------------------i-30 Automatic Recoil Starter
Clutch -------------------------------------------------------Centrifugal Type
Vibration Isolated System---------------------------------Rubber anti-vibration grip on front handle.
Operating Rod ---------------------------------------------- 25.0 mm aluminum tube
Drive Shaft -------------------------------------------------- 6.35 mm (1/4 in.) flexible shaft
Gear Case Ratio -------------------------------------------- 1.4:1 Reduction
Rotating Direction ----------------------------------------- Counter Clockwise; viewed from top
Cutter Head ------------------------------------------------- Nylon line head (2-line) with .095 Crossfire™ Line capacity 6 m (20 ft.)
Handle------------------------------------------------------- Front - Loop and right rear handle with rubber grip
Shoulder Harness ------------------------------------------ Optional
Idle Speed---------------------------------------------------2,400 - 3,200 RPM
Wide Open Throttle Speed (W.O.T.) -------------------- 7,850 - 9,850 RPM

25

26

NOTES

GRASS TRIMMER/BRUSH CUTTER

OPERATOR'S MANUAL

NOTES

27

SERVICING INFORMA TION

PARTS

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.

/SERIAL NUMBER

Model No. _____________ SN. ____________

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.

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.

DEALER?

Call

1-800-432-ECHO

or

www.echo-usa.com

CONSUMER PRODUCT

SUPPORT

1-800-673-1558

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

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.

• Manuals are available by sending a written request stating the model number and serial number of your Echo unit,
part number of the manual, your name and address, and mail to the address below.

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

ECHO, INCORPORATED

400 OAKWOOD ROAD

LAKE ZURICH, IL 60047

www.echo-usa.com

08001001/08999999
09001001/09999999