Echo 02999999 User manual

Grass Trimmer/Brush Cutter
Operator'sManual
MODEL SRM - 231
SRM - 231U
Serial Number 02001001 - 02999999
WARNING DANGER
Readrulesforsafeoperationandinstructionscarefully. ECHOprovidesanOperator's
ManualandaSafetyManual. Bothmustbereadandunderstoodforproperandsafe
operation.
X7502094200 X750001150
03/01

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 and the SAFETY MANUAL you found in the same package. You will
find both easy to use and full of helpful operating tips and SAFETY messages.
WARNING 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.
THE OPERATOR'SMANUAL —
contains specifications and information for operation, starting,
stopping, maintenance, storage and assembly specific to this product.
THE SAFETY MANUAL —
explains possible hazards involved with the use of Grass Trimmers and
Brush Cutters 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
Manual Safety Symbols and Important Information ......... 3
Safety ................................................................................ 3
- Decals ..................................................................... 3
- International Symbols............................................. 4
- Equipment .............................................................. 5
- Fuel ......................................................................... 6
- Personal Condition and Safety Equipment............. 6
- Safe Operation ........................................................ 8
- ExtendedOperation/ExtremeConditions ............... 9
Description ....................................................................... 10
- Contents ............................................................... 10
- Emission Control .................................................. 11
- Blade Terms and Definitions ................................ 11
Specifications.................................................................... 14
Assembly.......................................................................... 15
- Drive Shaft/Power Head ....................................... 15
- Throttle Linkage and Ignition Leads ..................... 15
- PlasticShield Installation...................................... 16
- Nylon Head Installation ....................................... 16
- Front Handle Installation...................................... 16
- Accessory Installation .......................................... 17
- Harness Clamp Installation .................................. 17
- Install Metal Shield............................................... 18
- U-Handle Installation ........................................... 19
Pre-Operation ................................................................... 21
- Operation with Blades.......................................... 21
- Fuel ....................................................................... 23
- Equipment Check ................................................. 25
- Determine Operation Area ................................... 25
Operation.......................................................................... 26
- StartingColdEngine ............................................. 26
- StartingWarmEngine ........................................... 27
- StoppingEngine.................................................... 28
Maintenance ..................................................................... 28
- SkillLevels............................................................ 28
- Maintenance Intervals .......................................... 29
- Air Filter ............................................................... 30
- Fuel Filter ............................................................. 30
- SparkPlug............................................................. 31
- CoolingSystemCleaning ...................................... 31
- Exhaust System .................................................... 32
- Carburetor Adjustment ......................................... 33
- Lubrication............................................................ 34
- Nylon Line Replacement ...................................... 35
- Sharpening Metal Blades ...................................... 37
Troubleshooting................................................................ 38
Storage .............................................................................. 39
ServicingInformation........................................................ 40
- Parts...................................................................... 40
- Service ................................................................... 40
- ECHO Consumer Product Support...................... 40
- Warranty Card ...................................................... 40
- Additional or Replacement Manuals .................... 40
- Manual Ordering Instructions .............................. 40
Specifications,descriptionsandillustrative 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.
CopyRight© 2001 By Echo, Incorporated
All Rights Reserved.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 3
IMPORTANT Theenclosedmessage
provides information necessary for the
protection of the unit.
NOTE This enclosed message provides
tips for use, care and maintenance of the
unit.
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.
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.
SAFETY
DECALS
Metal Debris
Shield
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
orderedfromyourECHOdealer. SeePARTSORDERINGinstructions
forspecificinformation.
89017740630
Shaft Decal
Spanish Decal
English Translation
DEBRISSHIELDDECAL
ADVERTENCIA PELIGRO
Esta unidad puede ser peligrosa y producir
lesiones personales graves si no se usa en forma
adecuada. Para reducir el riesgo de lesionarse, los
operadores, los ayudantes y los espectadores
deben leer y comprender el Manual Del Operador y
los Manuales De Seguridad que se entregan
escritos en español.
WARNING DANGER
Thisunitcanbedangerous andcause
serious injury if improperly used. To
reduce injury risk to operator, helpers
and bystanders, read and understand
the Operator's and Safety Manuals,
whichareprovidedinSpanish.
HOTDECAL (near muffler)
P/N 89016006361

4
Shaft Decal
WARNING 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 precau-
tions 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 releasingthrottle.
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 IMPROP-
ERLYSHARPENED 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,400OAKWOODRD.,LAKE
ZURICH,IL 60047.
P/N 89016844830
INTERNATIONAL SYMBOLS
Symbol
description/application Symbol form/shape Symbol
description/application
Symbol form/shape
Hot
Surface
Carburetor adjustment
- Idle speed
Carburetor adjustment
- High speed mixture
Symbol
description/application Symbol form/shape Symbol
description/application
Symbol form/shape
"WARNING, SEE
OPERATOR'S
MANUAL
Wear eyes, ears and
head protection
Emergency stop
Fuel and oil mixture
Finger Severing Carburetor adjustment
- Low speed mixture
Primer Bulb
Ignition
ON/OFF
Wear hand and
foot protection WARNING
Keep bystanders and helpers
away 15 m (50 ft.).
Blade and string
line capable
Do not exceed
10,000 RPM.
Do not operate
without guards and
shields in place.
BEWARE
- Thrown,
Ricochet
objects
Engine choke
control.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 5
EQUIPMENT
WARNING DANGER
• Use only ECHO approved attachments. Serious injury may result
from the use of a non approved attachment combination. Read
and comply with all safety instructions listed in this manual and
safety manual.
• ECHO,INC.willnot be responsible for thefailureofcutting
devices, attachments or accessories which have not been tested
and approved by ECHO.
Before operation a complete check of the unit must be performed;
• Check unit for loose/missing nuts, bolts and screws. Tighten and/or
replace as needed. Do not use trimmer if any part is missing or
damaged.
• 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/or optional shoulder/waist harness
are adjusted for safe, comfortable operation. See Assembly for proper
adjustment.
• Have repairs done only by an authorized ECHO Dealer.
• Do not use any attachment, accessory or replacement part unless it is
recommended in this Operator's Manual.
Spark Arrestor - Catalytic Muffler / Muffler
• The muffler or catalytic muffler controls the exhaust noise and
emissions. The spark arrestor screen prevents hot, glowing particles
of carbon from leaving the muffler. Make sure the spark arrestor
screen is in good repair and properly seated in the muffler. Keep
exhaust area clear of flammable debris. Avoid contact during and
immediatelyafteroperation.
ATTACHMENTS
AND
ACCESSORIES

6
FUEL
WARNING DANGER
FuelisVERYflammable.Useextremecarewhenmixing,storingor
handling, or serious personal injury may result.
• Use an approved fuel container.
• DONOTsmokenearfuel.
• DONOTallow flamesorsparks nearfuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel
caps slowly allowing pressure to equalize.
• NEVERrefuelaunitwhentheengineis HOT!
• NEVERrefuela unitwiththe enginerunning.
• DONOTfillfueltanksindoors.ALWAYSfillfueltanks
outdoors 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
Spilled fuel is a leading cause of hydrocarbon emissions. Some
states may require the use of automatic fuel shut-off containers to
reducefuelspillage.ContactyourECHO 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.
PERSONAL CONDITION AND SAFETY EQUIPMENT
WARNING DANGER
Trimmer/Brush Cutter users risk injury to themselves and others if the trimmer/brush cutter is used improperly and or
safety precautions are not followed. Proper clothing and safety gear must be worn when operating a trimmer.
3 m (10 ft.)

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 7
Physical Condition --
Your judgment and physical dexterity may not be good:
• if you are tired or sick,
•ifyouaretakingmedication,
• 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 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.
• DONOTWEARSHORTS,
• DONOTWEARTIES,SCARVES,JEWELRY.
Wear sturdy work shoes with non-skid soles;
• DONOTWEAROPENTOEDSHOES,
• DONOTOPERATEUNITBAREFOOTED.
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.

8
SAFE OPERATION
Determine Operation Area
• Provide all operators of this equipment with the Operator's Manual
and instructions for safe operation.
• Review the area to be trimmed. Look for hazards that could contribute
to unsafe conditions.
• Spectators and fellow workers must be warned, and children and
animalspreventedfromcomingnearerthan15m(50ft.)while
thetrimmeris in use.
Operation
UseProperClothing&Equipment
• Before starting the unit, equip yourself and any other person
workingwithinthe15 m (50ft.)SafetyZone with the required
Protective Equipment and clothing.
WARNING DANGER
Do not operate this product indoors or in inadequately ventilated
areas. Engine exhaust contains poisonous emissions and can cause
serious injury or death.
AvoidHotSurfaces
• During operation, the exhaust area, drive shaft and the bearing
housing may become very hot. Avoid contact during and immediately
after operation. Always keep the exhaust area clear of flammable
debris. Allow the engine and muffler to completely cool before
performinganymaintenance activity.
KeepAFirmGrip
• Hold the front and rear handles with both hands with thumbs and
fingers encircling the handles
KeepASolidStance
• 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.
15 m
(50ft.)

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 9
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
recommendedbecausethe minimum exposurewhichmighttrigger the
ailmentisunknown.
• 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.
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).AnextremeRSIconditionisCarpalTunnelSyndrome
(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.

10
Contents List
Items MODELS
231U
231
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1 - Power Head / 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, wrench 17x19
--1, locking tool
--1, 8 x 10mm wrench
- 1, Nylon Trimmer Head
- 1, Safety Glasses
- 1, 2-Stroke Oil Sample, 2.6 oz.
- 1, Plastic Bag
--1, shield plate
--3, 5mm x 15mm screws (shield mtg.)
--1, 4mm Hexagon Wrench
--1, 8mm x 55mm bolt
--1, flat washer
--2, cable clips
- 1, Plastic Bag
--3, 5mm x 15mm screws (shield mount)
--2, 5mm x 8mm screws (bracket to shield)
--4, 5mm nuts
--4, 5mm lockwashers
--1, metal shield
--1, bracket
- 1, Shoulder Harness w/hip pad
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.
CONTENTS

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 11
EMISSION CONTROL
California Tier 2
The emission control system for these engines are EM (Engine
Modification).
AnEmissionControlLabelislocatedon theengine.
(ThisisanEXAMPLEONLY,informationonlabelvaries
byengineFAMILY).
IMPORTANTENGINEINFORMATION
ENGINE FAMILY: YEHXS.0234CA
DISPLACEMENT: 22.8 CC
THIS ENGINE MEETS U.S. EPA PH1 AND 2000 AND
LATER CALIFORNIA EMISSION REGULATIONS FOR
S.O.R.E. REFER TO OWNER'S MANUAL FOR
MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
AIRINDEXTAG
The Air Index Tag indicates, for purposes of
consumer awareness, how this product's
emissions compare to the standards enacted
by the California Air Resources Board.
PRODUCTEMISSIONDURABILITY
The 300 hour emission durability period is the time span selected by the manufacturer certifying the engine emissions
output meets applicable California emissions regulations, provided that approved maintenance procedures are
followed as listed in the Maintenance Section of this manual.
BLADE TERMS AND DEFINITIONS --
BladeConvertible
Model SRM-231 can be converted to utilize blades. Plastic/nylon blades require a, "Blade Conversion Kit" P/N
99944200415, which includes a shoulder harness, and steel shield with necessary attaching hardware. Steel/metal blades
requireCombination"U-Handle/BladeConversionKit"P/N99944200521whichincludesBladeConversionKitParts,
U-Handle,ThrottleCableand Stop Switch.
DedicatedBladeCapable
Model(SRM-231U)includesthe"U-Handle/BladeConversionKit".

12
12
3
4
5
6
7
8
9
10
11
17
19
20
21
22
23
24
25
18
26
3
5
7
12
13
14
16
15
SRM-231U
SRM-231

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 13
1. OPERATOR'SMANUAL- Included inplasticbag(co-pack). Read beforeoperationand keep inasafeplace for
future reference, i.e., operation, maintenance, storage and specifications.
2. SAFETYMANUAL- Included inplasticbag(co-pack). Read beforeoperationand keep inasafeplace for future
reference to learn proper, safe operating techniques.
3. POWERHEAD-IncludestheEngine,Clutch,FuelSystem,IgnitionSystemandRecoilStarter.
4. GRIP-Rear(righthand)handle.
5. STOPSWITCH - "SLIDE SWITCH" mounted on top of the Throttle Trigger Housing. Move switch FORWARD to
RUN,BACKtoSTOP.
6. FRONT HANDLE - The Front (loop) handle is loosely assembled to the Drive Shaft assembly and must be posi-
tioned for proper cutting attitude and operator comfort.
7. DRIVESHAFTASSEMBLY-IncludestheRear(righthand)Handleassembly,GearHousingassembly,Front(loop,
left hand) Handle assembly, steel drive shaft and Safety Decal.
8. NYLONCUTTERHEAD-Containsreplaceablenylontrimminglinethatadvanceswhenthetrimmerheadistapped
against the ground while the head is turning at normal operating speed.
9. CUT-OFFKNIFE -Automaticallytrimslineto thecorrect length:5" afterhead istappedontheground.Iftrimmeris
operated without a cut-off knife the line will become too long, the engine will overheat and engine damage may occur.
10. PLASTICDEBRISSHIELDASSEMBLY-Includedinplasticbag(co-pack). MUSTbeinstalledonunitbeforeuse,
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 opera-
tion. This shield must be replaced with the steel shield for blade use.
11. THROTTLETRIGGER-Springloadedtoreturntoidlewhenreleased. Duringacceleration,presstriggergradually
for best operating technique.
12. BLADE - Circular blade for grass, weed or brush cutting applications. Harness, metal shield & U-handles required for
blade operation.
13. METALBLADESHIELD-Requiredwhenunitisequipped withblades. Donotoperateunitwithoutshield.
14. U-HANDLE-Requiredformetalbladeoperation.
15. HIP PAD - Used to protect hip/leg and clothing when using U-handle equipped unit.
16. SHOULDER HARNESS- An adjustable strap that suspends the unit from the operator. Using the strap reduces
operator fatigue.
17. SPARKPLUG-Providessparktoignitefuelmixture.
18. ARM REST - Provides arm rest during operation and protects arm from the hot engine.
19. SPARKARRESTOR-CATALYTICMUFFLER/MUFFLER-Themufflerorcatalyticmufflercontrolsexhaustnoise
and emission. The spark arrestor screen prevents hot, glowing particles of carbon from leaving the muffler. Keep
exhaustareaclearofflammabledebris.
20. FUELTANK-Containsfuelandfuelfilter.
21. RECOILSTARTERHANDLE-Pullhandleslowlyuntilstarterengages,thenquicklyandfirmly. Whenengine
starts, return handle slowly. DO NOT let handle snap back or damage to unit will occur.
22. FUELTANKCAP-Coversandsealsfueltankopening.
23. PRIMERBULB -Pumpingprimerbulbbeforestartingenginedrawsfreshfuelfromthefueltankprimingthecarbure-
tor for starting. Pump primer bulb until fuel is visible and flows freely in the clear fuel tank return line. Pump bulb an
additional4 or5times.
24. AIRCLEANER-Containsreplaceablefilterelement.
25. CHOKE - The choke control is located at the rear of the air cleaner housing. Move choke lever to "Cold Start" to
close choke for cold start. Move choke lever to "Run" position to open choke.
26. SAFETYVIDEO-(Notincludedwithunit)P/N99922202540Englishversiononlyisavailableatacostof$5.00from
ECHO, INC. or any authorized ECHO dealer. The video overviews safety precautions and proper operating tech-
niques and is supplemental to the Safety Manual. Read and understand the Safety Manual for complete information
on safe operation.

14
SPECIFICATIONS
* Install and use U-Handle when operating any model with blade.
LEDOM132-MRSU132-MRS
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deepSelttorhTnepOediW edalBhtiw).T.O.W( MPR00011-0059

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 15
ASSEMBLY
THROTTLE LINKAGE AND IGNITION LEADS
(SRM-231U)
1. Connect ignition stop leads (A) and (B).
2. Place throttle linkage (C)throughadjustmentfixture (D) and install
wire end into large carburetor throttle swivel hole (E). Check throttle
for freedom of movement and that wide open throttle / low idle
extremes are adjusted properly. The throttle linkage must be
adjusted by moving the adjustment fixture (D). Consult with your
Echo Dealer for correct adjustment procedure.
3. Bundle and secure ignition leads against engine housing with clip
(F).
PLASTIC SHIELD INSTALLATION
(For Nylon Line Operation)
Tools Required: Screwdriver.
Parts Required: PlasticShield,ShieldPlate,three(3)5mmx15mm
screws.
NOTE
The plastic shield is for use with the Nylon Line Head only.
Install Metal Shield when using plastic or metal blades.
1A. (SRM-231)RemovevinylprotectorfromPTOshaft.
1B. (SRM-231U)Removebladeandmetalshield,ifinstalled.
2. Place plastic shield on bottom of bearing housing flange.
3. Place shield plate on plastic shield, align holes. Install three (3)
screws from bottom through plate and shield into gear case.
4. Install adapter plate (A) onto PTO shaft.
A
B
C
DE
F
A

16
NYLON LINE HEAD INSTALLATION
(Use with Plastic Shield)
Tools Required: HeadLockingTool,
Parts Required: NylonLineHead.
1. Be sure upper adaptor plate remains on PTO shaft.
2. Align locking hole in upper plate with notch in edge of gear
housing and insert head locking tool (B).
3. Thread line head onto shaft by turning it counter clockwise until
head is tight against upper plate.
FRONT HANDLE INSTALLATION
(SRM-231)
Tools Required: Screwdriver.
Parts Required: Front Handle Assembly
1. Position front handle for comfortable operation and secure screws.
NOTE
ForSRM-231U HandleAssembly referto "U-HandleInstallation"
page19,instructions10,12-14,16,17.
B
ACCESSORYINSTALLATION
BladeConversionKitP/N99944200415,U-Handle/BladeConversionKitP/N99944200521.
NOTE
Refer to Operation with Blades page 21 for correct Accessory / Blade equipment requirements.
WARNING DANGER
You must install a U-Handle/Blade Conversion Kit before operating this unit using metal blades, otherwise serious
injurymayresult.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 17
HARNESS CLAMPINSTALLATION
NOTE
SRM-231requiresinstallation of Harness Clampincludedinthe
Blade Conversion Kit or U-Handle / Blade Conversion Kit. If your
unit does not have a clamp, follow these directions.
Tools Required: Screwdriver,8mmx10mmOpenEndWrench.
1. Remove shield and gear housing as an assembly.
a. Loosen two (2) screws (A) that clamp the gear housing to the
drive shaft housing.
b. Remove locating screw (B) found at the top of the gear
housing. Pull shield and gear housing assembly from the drive
shaft assembly.
IMPORTANT
Prevent steel drive shaft from sliding from drive shaft housing. If
shaft does slide free, clean dirt from shaft and re-assemble.
2. Remove front handle.
a. Remove four (4) screws and nuts and handle support from
handle.
b. Removehandle.
3. Installclamp.
4. Install front handle, gear housing and shield.
5. Balanceunit.
a. Put on harness and attach unit to harness.
b. Slide harness clamp (C) up or down until unit balances with
cutting attachment approximately 2" - 3" from the ground.
c. Tighten harness clamp screw.
A
BA
C

18
SRM-231
INSTALL METAL SHIELD
ToolsRequired: 8mmx10mmOpenEndWrench,Screwdriver.
PartsRequired: MetalShield,Bracket,3-5mmx15mmscrews
w/captivated flat and lockwasher (metal shield to gear housing),
2-5mmx8mmscrews,4-5mmnuts,4-5mmlockwashers(bracketto
shield and bracket to gear housing).
1. If necessary, remove nylon line head and plastic shield.
2. Loosely attach bracket (A) to shield (B) and attach to bottom of
gear housing (C) with screws and nuts provided. Tighten all
attaching hardware.
Install Blade
Tools Required: Locking Tool, scrench.
PartsRequired: 1-20mmUpperFixingPlate,GrassBlade
(69600120330),BrushBlade(69500120330) orTri-CutBladew/GlideCup
(99944200030), 1-LowerFixingPlate, 1-10mmL.H.Nut, 1-2x22mm
SplitPin.
3. Install upper plate (D) on splined shaft. Blade installation requires
useofupperPlate(D) with20mmpilot. Upperplatewith37mmpilot
should be retained for use with nylon line head.
4. Place Blade (E)overupper plate pilot,installthelower Plate (F)
and10mmLHnut(G). Tri-CutBlade(H)isinstalledwithGlide
Cup (J).
5. Insert Locking Tool (K) through hole in upper plate and notch in
gear housing to prevent splined shaft from turning. Tighten nut
andsecurewith SplitPin(L).

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 19
U-HANDLEINSTALLATION
Tools Required: 8mmx10mmOpenEndWrench,Screwdriver,3mm
and4mmHexWrench,Pliers
Parts Required: U-Handle/BladeConversionKitP/N99944200521.
NOTE
ForModelSRM-231Uusesteps10,12-14,16,17.
1. Disconnect ignition stop leads (A) and (B).
2. Removeinnerthrottlelinkagefromcarburetorswivel(C).
3. Removethrottlelinkage(D)fromthrottlelinkagefixture(E).
4. Loosen bolt (F) and pull drive shaft assembly from clutch case.
5. Loosen two (2) rear handle screws (G) and pull rear handle (H) from
the drive shaft assembly.
6. Loosen four (4) screws (I) and remove front handle.
7. Install harness hook (J).
8. PositionlowerU-Handlebracket(K)400mm(15-3/4in.)from
engineend ofdrive shaft. Securewiththree(3)5mmx30mm
bolts.
9. Position harnesshook220mm(8-5/8 in.)fromengine end ofdrive
shaft assembly. DO NOT tighten at this time.
10. Install upper U-Handle and bracket on lower bracket and secure
withone(1)8mmx55mmbolt(L)andlargecircularwasher.
11. Install power head and align gear box, power head and U-Handles.
Tighten all screws.
L
400 mm (15-3/4 in.)
220 mm
(8-21/32 in.)
ENGINE
END
J
K
F
G
I
H
A
B
D
EC

20
12. Route throttle linkage and ignition lead assembly along shaft and
clip as shown.
13. Place throttle linkage(D)through adjustment fixture (E)andinstall
wire end into large carburetor throttle swivel hole (C). Check
throttle for freedom of movement and that wide open throttle / low
idle extremes are adjusted properly. The throttle linkage must be
adjusted by moving the adjustment fixture (E). Consult with your
Echo Dealer for correct adjustment procedure.
14. Connect ignition leads (A) and (B).
15. (SRM-231)Removeleftsideclutchcasebolt(M).Installmetal
bracket clamp (N) with curved end up.
16. (All Models) Install throttle linkage into bracket clamp and pinch
tight with pliers. Bend bracket up and flush against drive shaft.
17. Bundle and secure ignition leads against engine housing with clip
(O).
MN
A
B
D
EC
O