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Troubleshooting Guide

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21 Troubleshooting Guide 21 Troubleshooting Guide English 21.1 Trimmer / Brushcutter Many performance issues can be resolved with a few simple steps. When troubleshooting, STIHL recommends that you start with the following measures: ► Replace the air filter, @ 21.2. ► Clean or replace the spark plug, @ 21.3. ► As appropriate for conditions, set the trimmer's "shutter" for winter or summer operation, @ 15.1 or @ 15.2. ► Adjust the trimmer's / brushcutter's idle speed, @ 21.4. ► If these measures do not resolve the issue, continue to the steps described below. Always shut off the engine before carrying out any inspection, cleaning or maintenance. Condition Possible Cause The engine does not start. There is insufficient fuel in the fuel tank. The carburetor is too hot. The carburetor is iced up. The engine idles erratically. The carburetor is iced up. The engine stops while The carburetor is iced up. idling. The cutting attachment The throttle cable is not set correctly. rotates when the engine is The idle speed is not set correctly. idling. Remedy ► Refuel the trimmer / brushcutter, @ 10.2. ► Cool down the trimmer / brushcutter. ► Before starting the engine. Press the manual fuel pump bulb at least ten times - even if the bulb is filled with fuel. ► Allow the engine to warm up gradually to a temperature of about 50 °F (10 °C). ► Allow the engine to warm up gradually to a temperature of about 50 °F (10 °C). ► Allow the engine to warm up gradually to a temperature of about 50 °F (10 °C). ► Adjusting the throttle cable, @ 21.5. ► Adjust the trimmer's / brushcutter's idle speed, @ 21.4. The engine does not reach The throttle cable is not set correctly. maximum speed. The fuel tank is not completely emptied. The pick-up body / filter inside the fuel tank is not in place. ► Adjusting the throttle cable, @ 21.5. ► Have the pick-up body / filter checked by an authorized STIHL servicing dealer. 21.2 Replacing the Air Filter Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult. 0458-853-8601-B If there is a noticeable loss of engine power: ► Shut off the engine, @ 12.1. ► Allow the trimmer / brushcutter to cool down. 45

Section	Page
1 Introduction	4
2 Guide to Using this Manual	5
2.1 Signal Words	5
2.2 Symbols in Text	5
3 Main Parts	5
3.1 Trimmer / Brushcutter	5
3.2 Available Cutting Attachments and Deflectors	7
4 Safety Symbols on the Products	7
4.1 Trimmer / Brushcutter	7
4.2 Deflector for Mowing Heads	8
4.3 Deflector for Metal Cutting Attachments	8
4.4 Skirt	8
5 IMPORTANT SAFETY INSTRUCTIONS	9
5.1 Introduction	9
5.2 Intended Use	9
5.3 Operator	9
5.4 Personal Protective Equipment	10
5.5 Trimmer / Brushcutter	11
5.6 Fueling Instructions	12
5.7 Using the Trimmer / Brushcutter	15
5.7.1 Before Operation	15
5.7.2 Starting	16
5.7.3 Holding and Controlling the Trimmer / Brushcutter	17
5.7.4 Working Conditions	18
5.7.5 Operating Instructions	19
5.8 Working with the Cutting Attachments	22
5.8.1 Kickout (Blade Thrust) with All Metal Cutting Attachments	22
5.8.2 Using a Mowing Head	23
5.8.3 Using a Grass Cutting Blade	23
5.8.4 Using a Brush Knife	24
6 Maintenance, Repair and Storage	25
6.1 Warnings and Instructions	25
7 Before Starting Work	26
7.1 Preparing the Trimmer / Brushcutter for Operation	26
8 Assembling the Trimmer / Brushcutter	26
8.1 Mounting the Carrying Ring	26
8.2 Mounting the Loop Handle	26
8.3 Mounting the Barrier Bar	27
8.4 Mounting and Removing a Deflector	27
8.4.1 Mounting a Deflector	27
8.4.2 Removing a Deflector	28
8.5 Mounting and Removing a Mowing Head	29
8.5.1 Mounting a Mowing Head	29
8.5.2 Removing a Mowing Head	30
8.6 Mounting and Removing a Metal Cutting Attachment	30
8.6.1 Mounting a Metal Cutting Attachment	30
8.6.2 Removing a Metal Cutting Attachment	31
9 Adjusting the Trimmer / Brushcutter	31
9.1 Putting on and Adjusting the Shoulder Strap or Full Harness	31
9.2 Adjusting the Loop Handle	32
9.3 Balancing the Trimmer / Brushcutter	32
10 Mixing Fuel and Refueling the Trimmer / Brushcutter	33
10.1 Mixing Fuel	33
10.2 Refueling the Trimmer / Brushcutter	34
11 Starting the Engine	36
11.1 Starting the Engine	36
12 Shutting Off the Engine	37
12.1 Shutting Off the Engine	37
13 Checking the Power Tool	38
13.1 Testing the Controls	38
14 During Operation	38
14.1 Using the Trimmer / Brushcutter	38
14.2 Adjusting the Nylon Line	39
15 Adjusting the Carburetor	40
15.1 Winter Operation	40
15.2 Summer Operation	40
16 After Finishing Work	40
16.1 Preparing for Transportation or Storage	40
17 Transporting	41
17.1 Transporting the Trimmer / Brushcutter	41
18 Storing	41
18.1 Storing the Trimmer / Brushcutter	41
19 Cleaning	42
19.1 Cleaning the Trimmer / Brushcutter	42
20 Inspection and Maintenance	43
20.1 Inspection and Maintenance Chart	43
20.2 Inspecting and Maintaining the Trimmer / Brushcutter	43
20.3 Lubricating the Gearbox	44
20.4 Replacing the Trimmer Line on an AutoCut 25-2 Mowing Head	44
20.5 Sharpening and Balancing a Metal Cutting Attachment	46
21 Troubleshooting Guide	47
21.1 Trimmer / Brushcutter	47
21.2 Replacing the Air Filter	47
21.3 Cleaning the Spark Plug	48
21.4 Adjusting Idle Speed	49
21.5 Adjusting the Throttle Cable	49
22 Specifications	49
22.1 EPA	49
22.2 STIHL FS 251 R	50
22.3 Symbols on the Power Tool and Deflector	50
22.4 Engineering Improvements	50
23 Approved Deflector, Cutting Attachment and Harness Combinations	51
23.1 STIHL FS 251 R	51
24 Replacement Parts and Equipment	52
24.1 Genuine STIHL Replacement Parts	52
25 Disposal	53
25.1 Disposal of the Power Tool	53
26 Limited Warranty	53
26.1 STIHL Incorporated Limited Warranty Policy	53
27 Emission Control Warranty	53
27.1 STIHL Incorporated Federal Emission Control Warranty Statement	53
28 Trademarks	55
28.1 Registered Trademarks	55
28.2 Common Law Trademarks	55
29 Addresses	56
29.1 STIHL Incorporated	56
1 Introducción	59
2 Acerca de este manual de instrucciones	59
2.1 Palabras identificadoras	59
2.2 Símbolos en el texto	60
3 Componentes importantes	60
3.1 Motoguadaña / desmalezadora	60
3.2 Accesorios de corte y deflectores disponibles	62
4 Símbolos de seguridad en los productos	62
4.1 Motoguadaña / desmalezadora	62
4.2 Deflector para cabezas segadoras	63
4.3 Deflector para accesorios de corte de metal	63
4.4 Faldilla	64
5 INSTRUCCIONES IMPORTANTES DE SEGURIDAD	64
5.1 Introducción	64
5.2 Uso previsto	64
5.3 Operador	65
5.4 Equipos de protección personal	66
5.5 Motoguadaña / desmalezadora	67
5.6 Instrucciones para el llenado de combustible	68
5.7 Uso de la motoguadaña / desmalezadora	71
5.7.1 Antes de usar	71
5.7.2 Arranque	73
5.7.3 Sujeción y control de la motoguadaña / desmalezadora	73
5.7.4 Condiciones de trabajo	75
5.7.5 Instrucciones de manejo	76
5.8 Uso de los accesorios de corte	79
5.8.1 Expulsión (disparo de la cuchilla) con todos los accesorios de corte metálicos	79
5.8.2 Uso de una cabeza segadora	80
5.8.3 Uso de una cuchilla para pasto	81
5.8.4 Uso de la cuchilla para matorrales	82
6 Mantenimiento, reparación y almacenamiento	83
6.1 Advertencias e instrucciones	83
7 Antes de empezar a trabajar	84
7.1 Preparación de la motoguadaña /desmalezadora para el funcionamiento	84
8 Armado de la motoguadaña / desmalezadora	84
8.1 Montaje de la argolla de transporte	84
8.2 Montaje del mango circular	84
8.3 Montaje de la barra de defensa	85
8.4 Instalación y retiro de un deflector	85
8.4.1 Montaje de un deflector	85
8.4.2 Retirada del deflector	86
8.5 Montaje y retiro de una cabeza segadora	87
8.5.1 Montaje de un cabezal de corte	87
8.5.2 Desmontaje de un cabezal de corte	88
8.6 Montaje y retiro de un accesorio de corte metálico	88
8.6.1 Montaje de un accesorio de corte de metal	88
8.6.2 Retirada de un accesorio de corte metálico	89
9 Ajuste de la motoguadaña / desmalezadora	89
9.1 Colocación y ajuste de la correa para el hombro o del arnés completo	89
9.2 Ajuste del mango circular	90
9.3 Equilibrado de la motoguadaña / desmalezadora	90
10 Mezcla del combustible y carga de combustible en la motoguadaña / desmalezadora	91
10.1 Mezcla del combustible	91
10.2 Carga de combustible en la motoguadaña / desmalezadora	93
11 Arranque del motor	94
11.1 Arranque del motor	94
12 Apagado del motor	96
12.1 Apagado del motor	96
13 Comprobación de la herramienta motorizada	96
13.1 Prueba de los controles	96
14 Durante el funcionamiento	97
14.1 Uso de la motoguadaña / desmalezadora	97
14.2 Ajuste del hilo de nilón	98
15 Ajuste del carburador	98
15.1 Manejo durante el invierno	98
15.2 Manejo durante el verano	99
16 Después de completar el trabajo	99
16.1 Preparación para el transporte o el almacenamiento	99
17 Transporte	100
17.1 Transporte de la motoguadaña / desmalezadora	100
18 Almacenamiento	100
18.1 Almacenamiento de la motoguadaña / desmalezadora	100
19 Limpieza	101
19.1 Limpieza de la motoguadaña / desmalezadora	101
20 Inspección y mantenimiento	102
20.1 Tabla de inspección y mantenimiento	102
20.2 Inspección y mantenimiento de la motoguadaña / desmalezadora	103
20.3 Lubricación de la caja de engranajes	103
20.4 Sustitución del hilo de la motoguadaña en una cabeza segadora AutoCut 25-2	103
20.5 Afilado y equilibrado de un accesorio de corte metálico	105
21 Guía de solución de problemas	106
21.1 Motoguadaña / desmalezadora	106
21.2 Sustitución del filtro de aire	107
21.3 Limpieza de la bujía	107
21.4 Ajuste de marcha en vacío	108
21.5 Ajuste del cable del acelerador	109
22 Especificaciones	109
22.1 E.P.A.	109
22.2 STIHL FS 251 R	109
22.3 Símbolos en la herramienta motorizada y el deflector	110
22.4 Mejoramientos técnicos	110
23 Combinaciones aprobadas de deflector, accesorio de corte y arnés	111
23.1 STIHL FS 251 R	111
24 Piezas y equipos de repuesto	112
24.1 Piezas de repuesto originales de STIHL	112
25 Eliminación	113
25.1 Desecho de la herramienta motorizada	113
26 Garantía limitada	113
26.1 Política de garantía limitada de STIHL Incorporated	113
27 Garantía del sistema de control de emisiones	113
27.1 Declaración de garantía de STIHL Incorporated sobre sistemas de control de emisiones según normas federales	113
28 Marcas comerciales	115
28.1 Marcas comerciales registradas	115
28.2 Marcas comerciales por ley común	116
29 Direcciones	116

Match case Limit results 1 per page

0458-853-8601-B

English

21 Troubleshooting Guide

21.1

Trimmer / Brushcutter

21.2

Replacing the Air Filter

Dirty air filters reduce engine power, increase fuel

consumption and make starting more difficult.

If there is a noticeable loss of engine power:

►

Shut off the engine,

12.1.

►

Allow the trimmer / brushcutter to cool down.

Troubleshooting Guide

Many performance issues can be resolved with a few simple steps. When troubleshooting, STIHL recommends that you start

with the following measures:

►

Replace the air filter,

21.2.

►

Clean or replace the spark plug,

21.3.

►

As appropriate for conditions, set the trimmer's "shutter" for winter or summer operation,

15.1 or

15.2.

►

Adjust the trimmer's / brushcutter's idle speed,

21.4.

►

If these measures do not resolve the issue, continue to the steps described below.

Always shut off the engine before carrying out any inspection, cleaning or maintenance.

Condition

Possible Cause

Remedy

The engine does not start.

There is insufficient fuel in the fuel tank.

►

Refuel the trimmer / brushcutter,

10.2.

The carburetor is too hot.

►

Cool down the trimmer / brushcutter.

►

Before starting the engine. Press the manual

fuel pump bulb at least ten times – even if the

bulb is filled with fuel.

The carburetor is iced up.

►

Allow the engine to warm up gradually to a

temperature of about 50 °F (10 °C).

The engine idles

erratically.

The carburetor is iced up.

►

Allow the engine to warm up gradually to a

temperature of about 50 °F (10 °C).

The engine stops while

idling.

The carburetor is iced up.

►

Allow the engine to warm up gradually to a

temperature of about 50 °F (10 °C).

The cutting attachment

rotates when the engine is

idling.

The throttle cable is not set correctly.

►

Adjusting the throttle cable,

21.5.

The idle speed is not set correctly.

►

Adjust the trimmer's / brushcutter's idle

speed,

21.4.

The engine does not reach

maximum speed.

The throttle cable is not set correctly.

►

Adjusting the throttle cable,

21.5.

The fuel tank is not

completely emptied.

The pick-up body / filter inside the fuel tank is

not in place.

►

Have the pick-up body / filter checked by an

authorized STIHL servicing dealer.