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•  SAFETY AND INTERNATIONAL SYMBOLS  •

This operator's manual describes safety and international symbols and pictographs that may appear on this product.
Read the operator's manual for complete safety, assembly, operating, maintenance, and repair information.

RULES FOR SAFE OPERATION

The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols,
and their explanations, deserve your careful attention and understanding. The safety warnings do
not by themselves eliminate any danger. The instructions or warnings they give are not substitutes
for proper accident prevention measures.

NOTE:

Advises you of information or instructions vital to the operation or maintenance of the equipment.

SYMBOL

MEANING

SPARK ARRESTOR NOTE
NOTE: For users on U.S. Forest Land and in the states of California, Maine, Oregon and Washington.

All U.S. Forest Land and the state of California (Public Resources Codes 4442 and 4443), Oregon and
Washington require, by law that certain internal combustion engines operated on forest brush and/or grass-
covered areas be equipped with a spark arrestor, maintained in effective working order, or the engine be
constructed, equipped and maintained for the prevention of fire. Check with your state or local authorities for
regulations pertaining to these requirements. Failure to follow these requirements could subject you to liability
or a fine. 

This unit is factory equipped with a spark arrestor.

If it requires replacement, ask your LOCAL

SERVICE DEALER to install the 

Accessory Part #753-06182 Muffler Assembly

.

READ ALL INSTRUCTIONS BEFORE OPERATING

• Read the instructions carefully. Be familiar with the controls and proper use of the unit.
• Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.
• Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.
• All guards and safety attachments must be installed properly before operating the unit.
• Inspect the unit before use. Replace damaged parts. Check for fuel leaks. Make sure all fasteners are in

place and secure. Replace parts that are cracked, chipped, or damaged in any way. Do not operate the
unit with loose or damaged parts.

• Carefully inspect the area before starting the unit. Remove all debris and hard or sharp objects such as

glass, wire, etc.

• Be aware of the risk of injury to the head, hands and feet.
• Clear the area of children, bystanders, and pets. At a minimum, keep all children, bystanders, and pets

outside a 50 feet (15 m) radius; there still may be a risk to bystanders from thrown objects. Bystanders
should be encouraged to wear eye protection. If approached, stop the unit immediately.

• Use only 0.095 inch (2.41 mm) diameter original equipment manufacturer replacement line. Never use

metal-reinforced line, wire or rope. These can break off and become dangerous projectiles. 

• Squeeze the throttle control and check that it returns automatically to the idle position. Make all

adjustments or repairs before using unit.

SAFETY WARNINGS FOR GAS UNITS

• Store fuel only in containers specifically designed and approved for the storage of such materials.
• Avoid creating a source of ignition for spilled fuel. Do not start the engine until fuel vapors dissipate.
• Always stop the engine and allow it to cool before filling the fuel tank. Never remove the cap of the fuel

tank, or add fuel, when the engine is hot. Never operate the unit without the fuel cap securely in place.
Always loosen the fuel tank cap slowly to relieve any pressure in the tank.

• Mix and add fuel in a clean, well-ventilated outdoor area where there are no sparks or flames. Do not

smoke while fueling or mixing fuel. Wipe up any spilled fuel from the unit immediately. Always wipe unit
dry before using.

• Move the unit at least 30 feet (9.1 m) from the fueling source and site before starting the engine. Do not

smoke or allow sparks and open flames near the area while adding fuel or operating the unit.

WHILE OPERATING

• Never start or run the unit inside a closed room or building. Breathing exhaust fumes can kill. Operate this

unit only in a well ventilated outdoor area.

• Wear safety glasses or goggles that are marked as meeting ANSI Z87.1-1989 standards. Also wear

ear/hearing protection when operating this unit. Wear a face or dust mask if the operation is dusty. Long
sleeve shirts are recommended.

• Wear heavy, long pants, boots and gloves. Do not wear loose clothing, jewelry, short pants, sandals or go

barefoot. Secure hair above shoulder level.

• The cutting head shield must always be in place while operating the unit. Do not operate unit without

both trimming lines extended, and the proper line installed. Do not extend the trimming line beyond the
length of the shield.

• The cutting attachment may spin during idle speed adjustments. Wear protective clothing and observe all

safety instructions to prevent serious personal injury.

• Adjust the D-handle to provide the best grip.
• Be sure the cutting head is not in contact with anything before starting the unit.
• Use the unit only in daylight or good artificial light.
• Avoid accidental starting. Be in the starting position whenever pulling the starter rope. The operator and

unit must be in a stable position while starting. See Starting/Stopping Instructions.

• Use the right tool. Only use this tool for the purpose intended.
• Do not overreach. Always keep proper footing and balance.
• Always hold the unit with both hands when operating. Keep a firm grip on both the front and rear handle

or grips.

• Keep hands, face, and feet at a distance from all moving parts. Do not touch or try to stop the cutting

head when it is rotating.

• Do not touch the engine or muffler. These parts get extremely hot from operation. They remain hot for a

short time after turning off the unit.

• Do not operate the engine faster than the speed needed to cut, trim or edge. Do not run the engine at

high speed when not cutting.

• This unit has an overspeed protection switch to keep the unit from overheating. When the unit is run at full throttle

while not in use for extended lengths of time the overspeed protection switch will engage.

• Always stop the engine when cutting is delayed or when walking from one cutting location to another.
• If the unit is struck or becomes entangled with a foreign object, stop the engine immediately and check for

damage. Do not operate before repairing damage. Do not operate the unit with loose or damaged parts.

• Stop and switch the engine to off for maintenance, repair, or for changing the cutting head or other Add-Ons.
• Use only original equipment manufacturer replacement parts and accessories for this unit. These are

available from an authorized service dealer. The use of any unauthorized parts or accessories could lead
to serious injury to the user, or damage to the unit, and void the warranty.

• Keep unit clean of vegetation and other materials. They may become lodged between the cutting head

and shield.

• To reduce fire hazard, keep the engine and muffler free from grass, leaves, excessive grease or carbon

build up.

OTHER SAFETY WARNINGS

• Never store the unit, with fuel in the tank, inside a building where fumes may reach an open flame or spark.
• Allow the engine to cool before storing or transporting. Be sure to secure the unit while transporting.
• Store the unit in a dry area, locked up or up high to prevent unauthorized use or damage, out of the reach

of children.

• Never douse or squirt the unit with water or any other liquid. Keep handles dry, clean and free from

debris. Clean after each use. See the Cleaning and Storage instructions.

• Keep these instructions. Refer to them often and use them to instruct other users. If loaning someone this

unit, also loan them these instructions.

SAVE THESE INSTRUCTIONS

SERVICE INFORMATION

TABLE OF CONTENTS

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Rules for Safe Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Know Your Unit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Assembly Instructions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Oil and Fuel Information  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Starting/Stopping Instructions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Operating Instructions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Maintenance & Repair Instructions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Cleaning and Storage  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Troubleshooting Chart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Warranty Information  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

All information, illustrations, and specifications in this manual are based on the latest product information
available at the time of printing. We reserve the right to make changes at any time without notice.
Copyright© 2009 MTD SOUTHWEST INC, All Rights Reserved.

For service call 

1-800-828-5500

in the United States or 

1-800-668-1238

in Canada to obtain a list of authorized

service dealers near you. For more details about your unit, visit our website at 

www.troybilt.com 

or

www.troybilt.ca

.

If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, please call the Customer Support Department.

DO NOT RETURN THE UNIT TO THE RETAILER.  PROOF OF PURCHASE WILL BE REQUIRED FOR
WARRANTY SERVICE.

THIS PRODUCT IS COVERED BY ONE OR MORE U.S. PATENTS. OTHER PATENTS PENDING. 
Service on this unit both within and after the warranty period should be performed only by an authorized and
approved service dealer.
Before beginning, locate the unit’s model plate. It lists the model and serial numbers of your unit. Refer to
the sample plate below and copy the information for future reference. 

Copy the serial number here:

Copy the model and parent part numbers here:

NOTE-

This Unit Can Use an Electric Start or Power Start Bit™ Optional Accessory!

Please refer to the Electric Starter or Power Start Bit™ operator’s manual for proper use of
these features. (Items Sold Separately! Please refer to page 5 of this manual for more
information about purchasing these accessories.)

READ THE OPERATOR’S MANUAL AND FOLLOW ALL WARNINGS AND SAFETY
INSTRUCTIONS. FAILURE TO DO SO CAN RESULT IN SERIOUS INJURY TO THE OPERATOR
AND/OR BYSTANDERS.
FOR QUESTIONS, CALL 1-800-828-5500 IN U.S. OR 1-800-668-1238 IN CANADA

CALIFORNIA PROPOSITION 65 WARNING

WARNING

THE ENGINE EXHAUST FROM THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE

OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.

SAFETY ALERT:

Indicates danger, warning or caution. Attention is required in order to

avoid serious personal injury. May be used in conjunction with other symbols or pictographs.

DANGER: 

Failure to obey a safety warning will result in serious injury to yourself or to

others. Always follow the safety precautions to reduce the risk of fire, electric shock and
personal injury.

WARNING:

Failure to obey a safety warning can result in injury to yourself and others. Always

follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

CAUTION: 

Failure to obey a safety warning may result in property damage or personal injury

to yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric
shock and personal injury.

WARNING:

When using the unit, you must follow the safety rules. Please read these

instructions before operating the unit in order to ensure the safety of the operator and any
bystanders. Please keep these instructions for later use.

WARNING:

Gasoline is highly flammable, and its vapors can explode if ignited. Take the

following precautions:

RULES FOR SAFE OPERATION

SYMBOL

MEANING

• SAFETY ALERT SYMBOL

Indicates danger, warning or caution. May be used in conjunction with other symbols
or pictographs.

• READ OPERATOR'S MANUAL

WARNING:

Read the operator’s manual(s) and follow all warnings and safety

instructions. Failure to do so can result in serious injury to the operator and/or bystanders.

• WEAR EYE AND HEARING PROTECTION

WARNING:

Thrown objects and loud noise can cause severe eye injury and hearing

loss. Wear eye protection meeting ANSI Z87.1-1989 standards and ear protection
when operating this unit. Use a full face shield when needed.

• UNLEADED FUEL

Always use clean, fresh unleaded fuel

• ON/OFF STOP CONTROL

ON / START / RUN

• ON/OFF STOP CONTROL

OFF or STOP

• DO NOT USE E85 FUEL IN THIS UNIT

WARNING:

It has been proven that fuel containing greater than 15% ethanol will

likely damage this engine and void the warranty.

• THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY

WARNING:

Small objects can be propelled at high speed, causing injury. Keep

away from the rotating rotor.

• KEEP BYSTANDERS AWAY

WARNING:

Keep all bystanders, especially children and pets, at least 50 feet (15 m.)

from the operating area.

• HOT SURFACE WARNING

Do not touch a hot muffler or cylinder. You may get burned. These parts get extremely
hot from operation. When turned off they remain hot for a short time.

• OIL

Refer to operator’s manual for the proper type of oil.

• CHOKE CONTROL

1. • FULL choke position
2. • PARTIAL choke position
3. • RUN choke position

• SHARP BLADE

WARNING: 

Sharp blade on cutting attachment shield.  To prevent serious injury, do

not touch the line cutting blade.

Summary of Contents for TB21 EC

Page 1: ...cal retailer or call 1 800 828 5500 for more information Information may also be found at www troybilt com DIDN T START Repeat these instructions IF engine fails to start after 2 attempts move choke lever to position 3 and pull the starter rope until engine starts IF unit still fails to start refer to the operator s manual for additional starting and troubleshooting information 1 Gallon 3 2 oz 40 ...

Page 2: ...object stop the engine immediately and check for damage Do not operate before repairing damage Do not operate the unit with loose or damaged parts Stop and switch the engine to off for maintenance repair or for changing the cutting head or other Add Ons Use only original equipment manufacturer replacement parts and accessories for this unit These are available from an authorized service dealer The...

Page 3: ...ex hole in the handle and push through Place the washer on the bolt then screw the wing nut onto the bolt Do not tighten until making the handle adjustment 3 Rotate the D handle to place the grip above the top of the shaft housing Place it a minimum of 6 inches 15 24 cm from the end of the shaft grip 4 While holding the unit in the operating position Fig 10 move the D handle to the location that p...

Page 4: ...d align with the eyelets on the outer spool Fig 22 2 Release the SpeedLock NOTE The SpeedLock should stand about 1 4 of an inch above the outer spool 3 Firmly pull one end of the trimming line until the whole piece exits the outer spool REMOVING THE SPEEDLOCK 1 While holding the outer spool in place turn the Bump Knob counterclockwise until it completely unscrews from the shaft 2 Remove the spring...

Page 5: ...mixture Improper carburetor adjustment Adjust according to the Carburetor Adjustments section TROUBLESHOOTING ENGINE WILL NOT START ENGINE WILL NOT IDLE ENGINE WILL NOT ACCELERATE IF FURTHER ASSISTANCE IS REQUIRED CONTACT AN AUTHORIZED SERVICE DEALER ENGINE LACKS POWER OR STALLS CUTTING LINE ADVANCES UNCONTROLLABLY CUTTING HEAD WILL NOT ADVANCE LINE ENGINE Drive Shaft Housing Steel Tube Throttle C...

Page 6: ...Z la manette des gaz en continu TOUT AU LONG des étapes suivantes Tirez 5 fois sur le cordon Mettez le levier d étranglement en position 2 et pressez la manette des gaz Tirez sur le cordon 3 à 5 fois de suite pour démarrer le moteur Laissez tourner le moteur 30 à 60 secondes pour le réchauffer Continuez de presser la manette des gaz Mettez le levier d étranglement en position 3 1 1 2 Retirez tous ...

Page 7: ...ER DES BLESSURES GRAVES AVERTISSEMENT ne faites pas fonctionner sans protecteur de sécurité en plastique Tenez vous à l écart de le tête de coupe rotatif ÉLOIGNEZ LES SPECTATEURS AVERTISSEMENT éloignez tout spectateur les enfants et les animaux domestiques en particulier d au moins 15 m 50 pi de la zone de coupe SURFACE CHAUDE AVERTISSEMENT Ne touchez pas un silencieux ou un cylindre chaud Vous po...

Page 8: ...AVERTISSEMENT évitez tout démarrage accidentel Tenez vous en position de démarrage lorsque vous tirez sur la corde de démarrage Fig 9 L opérateur et l appareil doivent tous deux être en position stable pour éviter des blessures graves INSTRUCTIONS DE DÉMARRAGE 1 Mélangez l essence avec l huile Remplissez le réservoir avec le mélange d essence et d huile Voir Instructions de mélange d huile et de c...

Page 9: ...res graves Fig 28 Fig 26 Fig 25 Fig 27 Couvercle du filtre à air Filtre à air Étiquette Fig 29 Vis de réglage de ralenti INSTRUCTIONS D ENTRETIEN ET RÉPARATIONS AVERTISSEMENT Pour éviter des blessures graves éteignez toujours la désherbeuse et laissez la refroidir avant tout nettoyage ou entretien Bobine externe Fig 21 Œillet Arbre SpeedLock Ressort Enfoncement Bump Knob Ligne de coupe Fig 22 Flèc...

Page 10: ...de démarrage Carburant vieux ou mal mélangé Drainez le réservoir ajoutez du carburant frais Bougie encrassée Remplacez ou nettoyez le CAUSE SOLUTION Accessoire de coupe engorgé d herbes Arrêtez le moteur et nettoyez l accessoire Accessoire de coupe mal aligné Chargez du fil neuf Moulinet intérieur bloqué Rembobinez le moulinet Tête de coupe sale Nettoyez le moulinet intérieur et la bobine extérieu...

Page 11: ...n Tire de la cuerda de arranque 5 veces Mueva la palanca del obturador hasta la Posición 2 y oprima el control del regulador Tire de la cuerda de arranque fuertemente de 3 a 5 veces para arrancar el motor Haga funcionar la unidad entre 30 y 60 segundos para calentar el motor Mantenga apretado el control del regulador Coloque la palanca del obturador en la Posición 3 1 1 2 Saque todo el contenido d...

Page 12: ...ial a niños y animales domésticos a por lo menos 50 pies 15 m del área de corte DE SUPERFICIE CALIENTE ADVERTENCIA No toque un silenciador ni un cilindro caliente Puede quemarse Estas partes se calientan mucho con el uso Luego de apagarse permanecen calientes durante un corto tiempo INDICADOR DE ACEITE Consulte el manual del operador para obtener información acerca del tipo correcto de aceite LEA ...

Page 13: ...deberá arrancar Si no sucede así repita el procedimiento SI SE CALIENTA El motor ya está caliente comience la unidad con la palanca del obturador en la Posición 2 Después de que la unidad arranque mueva la palanca azul a la Posición 3 Apagado O Encendido I Control del regulador Fig 7 Cuerda de arranque La Posición que empieza Fig 9 Fig 8 Bombilla del cebador Palanca azul INSTRUCCIONES PARA MEZCLAR...

Page 14: ...tador y espere que se enfríe antes de limpiarlo o realizar todo tipo de mantenimiento Fig 28 Fig 26 Fig 25 Fig 27 Cubierta del filtro de aire Filtro de aire Orejeta INSTRUCCIONES DE MANTENIMIENTO Y REPARACIÓN Línea de corte Fig 22 Flecha Ojete Línea de corte Fig 23 Uniforme Cabeza de corte Fig 24 Punto SpeedLock Ojete Bobina Exterior Fig 21 Ojete Eje SpeedLock Resorte Cavidad Bump Knob INSTRUCCION...

Page 15: ...uelgo Si usa una llave de torsión ajuste a 12 3 13 5 N m 110 120 pulg libras No ajuste demasiado LIMPIEZA Use un cepillo pequeño para limpiar la parte exterior de la unidad No use detergentes fuertes Los limpiadores domésticos que contienen aceites aromáticos como pino y limón y con solventes como el queroseno pueden dañar el bastidor de plástico y la manija Seque toda la humedad con un paño suave...

Page 16: ...s possessions et territoires exception faite en ce qui concerne les produits vendus par l intermédiaire de ses canaux agréés de distribution à l exportation Troy Bilt LLC se réserve le droit de modifier ou d améliorer la conception de ses produits sans pour autant assumer l obligation de modifier tout produit d une fabrication plus ancienne Aucune garantie implicite y compris toute garantie de val...

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