Toro 18in Gas Straight-Shaft Trimmer Manuel utilisateur

Trimmer/Brushcutter

Model No. 51973—260000001 & Up

Model No. 51993—260000001 & Up

English (EN), French (FR), and Spanish (ES)

WARNING:

To reduce the risk of injury, the user must read and understand the operator’s manual. Save this manual.

Form No. 3356-125 Rev. A

2

READ THIS INFORMATION

Before you use your new trimmer/brushcutter, read the following

helpful hints to get you started.

Fueling

DANGER:

Gasoline is extremely ﬂammable and explosive.

A ﬁre or explosion from gasoline will burn you and

others.

1. Obtain a clean container that is approved for use with gasoline.

2. Mix all of the 2-cycle oil provided with 1 US gallon of 87-octane, unleaded

gasoline (50:1).

3. Fill the trimmer’s gas tank carefully.

Cold Starting vs. Warm Starting

When you restart the trimmer/brushcutter and you are not sure whether the engine is still warm, set

the choke lever to RUN (Choke Open) and pull the starter cord. If the engine does not start within

5 pulls, see To Start a Cold Engine later in this manual.

Flooded Engine

Will the engine start? If not, it may be ﬂooded. Relax, this is easy to correct. Set the choke lever to

RUN (Choke Open). Squeeze the trigger and pull the starter cord quickly for 10 to 12 pulls.

If the engine does not start, refer to Troubleshooting later in this manual or call toll-free at

1-866-574-9242 (US) or 1-866-574-9243 (Canada).

WARNING: The engine exhaust from this product contains chemicals known to the State

of California to cause cancer, birth defects, or other reproductive harm.

Printed in USA

STOP

1-866-574-9242

CAL

L

For questions concerning your

trimmer/brushcutter, call us

toll free at 1-866-574-9242.

3

Table of Contents

Introduction ...................................................................................................................................................................................4

Safety Rules .............................................................................................................................................................................. 5-6

Symbols .................................................................................................................................................................................... 6-7

Product Labels ..............................................................................................................................................................................8

Features ................................................................................................................................................................................... 9-11

Product Speciﬁcations ...........................................................................................................................................................9

Assembly ............................................................................................................................................................................... 12-16

Unpacking ............................................................................................................................................................................12

Connecting the Attachment to the Upper Shaft ...................................................................................................................13

Removing the Attachment from the Upper Shaft ................................................................................................................

13

Attaching the Front Handle .................................................................................................................................................

13

Attaching the Shoulder Strap ...............................................................................................................................................14

Attaching the Grass Deﬂector ..............................................................................................................................................14

Converting from Brushcutter to Trimmer ............................................................................................................................15

Converting from Trimmer to Brushcutter ............................................................................................................................16

Operation ............................................................................................................................................................................... 17-20

Applications .........................................................................................................................................................................

17

Mixing the Fuel ....................................................................................................................................................................

17

Filling the Tank ....................................................................................................................................................................17

Starting the Product .............................................................................................................................................................

18

Stopping the Product ............................................................................................................................................................18

Operating the Trimmer ........................................................................................................................................................19

Operating the Brushcutter ....................................................................................................................................................20

Cutting Tips .........................................................................................................................................................................

20

Maintenance .......................................................................................................................................................................... 21-24

Emissions Maintenance Schedule ........................................................................................................................................21

Cleaning the Product ............................................................................................................................................................

21

Servicing the Product ...........................................................................................................................................................21

Replacing the Cutting Line ............................................................................................................................................ 21-22

Replacing the Spool .............................................................................................................................................................22

Checking the Fuel Cap .........................................................................................................................................................23

Cleaning the Air Filter .........................................................................................................................................................

23

Replacing the Spark Arrester ...............................................................................................................................................

23

Replacing the Spark Plug .....................................................................................................................................................24

Storing the Product ..............................................................................................................................................................24

Transporting the Product .....................................................................................................................................................24

Troubleshooting ..........................................................................................................................................................................25

Warranty ................................................................................................................................................................................ 26-28

Table of Contents

4

Introduction

Thank you for purchasing a Toro product.

We would like for you to be completely satisﬁed with your new product, so feel free to contact an authorized service dealer

for help with service, genuine Toro parts, or other information you may require.

Whenever you contact an authorized service dealer, always know the model and serial numbers of the product. These num-

bers will help the service representative provide exact information about your speciﬁc product. You will ﬁnd the model and

serial number decal located on the motor housing.

For your convenience, write the product model and serial numbers in the space below.

Model No.

Serial No.

Read this manual carefully to learn how to operate and maintain your product correctly. Reading this manual will help you

and others avoid personal injury and damage to the product. Although Toro designs, produces, and markets safe, state-of-the-

art products, you are responsible for using the product properly and safely. You are also responsible for training persons you

allow to use the product about safe operation.

The Toro warning system in this manual identiﬁes potential hazards and has special safety messages that help you and others

avoid personal injury, even death. DANGER, WARNING, and CAUTION are signal words that identify the level of hazard.

However, regardless of the hazard, be extremely careful. One other word, “Note,” highlights information.

Signal Word Explanation

DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury.

WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or

serious injury.

CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor

or moderate injury. It may also be used to alert against unsafe practices that may cause

property damage.

Note Advises you of additional information concerning the operation or maintenance of the

equipment.

Introduction

5

This product has been designed and manufactured to

meet or exceed the requirements of the current version of

ANSI B175.3, safety requirements for gasoline-powered

string trimmers and brushcutters.

 Physical Condition of the Operator. Do not operate

this product when tired, ill, or under the inﬂuence of

alcohol, drugs, or medication.

 Clothing Requirements. Always wear long heavy

pants, boots, and gloves. Do not wear loose cloth-

ing, jewelry, short pants, sandals, or go barefoot.

Secure hair so that it is above shoulder level to avoid

entanglement in moving parts.

 Protective Accessories Requirements. Wear eye

protection marked to comply with ANSI Z87.1

standards when operating this product. Wear hearing

protection during extended periods of operation.

 Condition of Trimmer Before Use. Inspect the

product before each use. Replace damaged parts.

Check for fuel leaks. Make sure all fasteners are

in place and secure. Replace cutting attachment

parts that are cracked, chipped, or damaged in any

way. Make sure the cutting attachment is properly

installed and securely fastened. Be sure the cutting

attachment shield is properly attached and in the

position recommended by the manufacturer. Use

only ﬂexible, non-metallic line recommended by the

manufacturer. For example, never use wire or wire-

rope, which can break off and become a dangerous

projectile.

 Proper Stance. Keep ﬁrm footing and balance. Do

not overreach. Keep the cutting attachment below

waist level. Keep all parts of your body away from

the rotating cutting attachment and hot surfaces.

 Exhaust Gases. Never start or run the product inside

a closed room or building; breathing exhaust fumes

can cause illness or death.

 Fueling. Mix and pour fuel outdoors where there are

no sparks and ﬂames. Slowly remove the fuel cap

only after stopping the engine. Do not smoke while

fueling or mixing fuel. Wipe spilled fuel from the

product. Move at least 30 ft. (9 m) away from the

fueling source and site before starting the engine.

 Work Area. Clear the area to be cut before each

use. Remove all objects, such as rocks, broken glass,

nails, wire, or string, that can be thrown or become

Safety Rules

WARNING:

Read and understand all instructions. Failure to follow all instructions may result in serious personal injury

as well as damage to the product.

entangled in the cutting attachment. Clear the area of

children, bystanders, and pets. At a minimum, keep

all children, bystanders, and pets outside a 50 ft.

(15 m) radius. Because there still may be a risk of

injury to bystanders from thrown objects, bystanders

should be encouraged to wear eye protection. If you

are approached while operating the product, stop the

engine and the cutting attachment.

 Dangerous Environments. To avoid falling, do not

use the product in damp or wet locations.

 Controlling the Product. During carburetor adjust-

ments the cutting attachment may spin. Therefore,

you should wear protective equipment and observe

all safety instructions when adjusting the carbure-

tor. For products equipped with a clutch, be sure the

cutting attachment stops turning when the engine

idles. When the product is turned off, make sure the

cutting attachment has stopped before setting down

the product.

 Use the Right Product. Use the product for the

intended purpose only.

 Condition of Brushcutter Before Use. The handles

shall be mounted according to the manufacturer’s

instructions. Do not attach any blade to a product

without proper installation of all required parts. Fail-

ure to use the proper parts can cause the blade to ﬂy

off and seriously injure the operator and/or bystand-

ers. Discard blades that are bent, warped, cracked,

broken, or damaged in any way.

 Use the Right Equipment. Always use the barrier

bar on the front handle and the shoulder strap with

the brushcutter.

 Blade Thrust. Blade thrust may occur when the

spinning blade contacts an object that it does not im-

mediately cut. A blade thrust can be violent enough

to cause the product and/or operator to be propelled

in any direction, and possibly lose control of the

product. Blade thrust can occur without warning if

the blade snags, stalls, or binds. This is more likely to

occur in areas where it is difﬁcult to see the material

being cut.

 Stopping the Product. A coasting blade can cause

injury while it continues to spin after the engine is

stopped or throttle is released. Maintain proper con-

trol until the blade has completely stopped rotating.

Safety Rules

6

Symbols

This engine is equipped with a spark arrester mufﬂer. It is a violation of California Public Resource Code Section

4442 to use or operate this engine without a spark arrester mufﬂer on any forest-covered, brush-covered, or grass-

covered land. Other states or federal areas may have similar laws.

This spark ignition system complies with Canadian ICES-002.

Save these instructions. Refer to them frequently and use them to instruct others who may use this product. If you

loan someone this product, loan these instructions also.

Symbols

The following symbols are located on the product. Please study them and learn their meaning. Proper interpretation of these

symbols allows you to operate the product better and safer.

Symbol Name Explanation

Safety Alert Symbol Precautions that involve your safety.

Read the Operator’s Manual Read the operator’s manual before starting or operating this product.

Failure to follow operating instructions and safety precautions in the

operator’s manual can result in serious injury.

Wear Eye and Hearing Protection Wear eye protection which is marked to comply with ANSI Z87.1 as

well as hearing protection when operating this equipment.

Keep Bystanders Away Keep all bystanders at least 50 feet (15 m) away.

Ricochet Thrown objects can ricochet and result in personal injury or property

damage.

No Blade Do not install or use any type of blade on a product displaying this

symbol.

Blade Thrust Beware of blade thrust. Products authorized for blade use will

display this symbol to warn of blade thrust.

Gasoline and Oil Use unleaded gasoline intended for motor vehicle use with an octane

rating of 87 [(R + M) / 2] or higher. This product is powered by a

2-cycle engine and requires pre-mixing gasoline and 2-cycle oil.

Safety Rules

7

Symbols

The following signal words and meanings are intended to explain the levels of risk associated with this

product.

SYMBOL SIGNAL MEANING

DANGER: Indicates an imminently hazardous situation, which, if not avoided, will

result in death or serious injury.

WARNING: Indicates a potentially hazardous situation, which, if not avoided, could result

in death or serious injury.

CAUTION: Indicates a potentially hazardous situation, which, if not avoided, may result

in minor or moderate injury.

CAUTION: (Without Safety Alert Symbol) Indicates a situation that may result in property

damage.

Symbols

SERVICE

Servicing requires extreme care and knowledge and should

be performed only by a qualiﬁed service technician. For

service we suggest you return the product to your nearest

AUTHORIZED SERVICE CENTER for repair. When

servicing, use only identical replacement parts.

WARNING:

To avoid serious personal injury, do not attempt

to use this product until you read thoroughly and

understand completely the operator’s manual. If you

do not understand the warnings and instructions in the

operator’s manual, do not use this product. Call Toro

customer service for assistance.

The operation of any power tool can result in foreign objects being thrown into your

eyes, which can result in severe eye damage. Before beginning power tool operation,

always wear safety goggles or safety glasses with side shields and, when needed, a full

face shield. We recommend Wide Vision Safety Mask for use over eyeglasses or standard

safety glasses with side shields. Always use eye protection which is marked to comply

with ANSI Z87.1.

WARNING:

SAVE THESE INSTRUCTIONS

8

Product Labels

Product labels and instructions are easily visible to the operator and are located near any area of potential danger.

Replace damaged or lost labels.

Part No. 940627032 (Shoulder Strap)

Part No. 940686006

Part No. 940230129 Part No. 940657004

Part No. 940627017

Product Labels

50' 15m

OFF ON

TO START

Set switch to ON

Push bulb 8x

Set choke lever to “FULL”

SQUEEZETHROTTLETRIGGER FULLY (THRU STEP

7)

and pull starter handle sharply (no more than 4x)

Set choke lever to “HALF”

Pull starter handle until engine runs

,

no more

than 6 pulls

.

For Help Call: 1-866-574-9242

Run engine at Full Throttle for 20 seconds, set

choke lever to "RUN"

pantone 2945c

pantone 362c

black

RYOBI ART WORK

Art Part No.: 940686006

Label Part No.: 940686006

Refer to Drawings for Dimensions

Rev.000

Part No. 308207004 (Air Box Cover)

9

Features

Product Specifications

Name Specification

Engine 25.4 cc Full Crank

Cutting Width

Model No. 51973 18 in.

Model No. 51993 8 in. for brushcutter, 18 in. for trimmer

Line Size .095 in.

Weight

Model No. 51973 13-1/2 lbs.

Model No. 51993 13-1/2 lbs.

Specifications

10

Features

Know Your Trimmer/Brushcutter

See Figure 1.

The safe use of this product requires an understanding of the

information on the tool and in this operator’s manual as well

as a knowledge of the project you are attempting. Before

use of this product, familiarize yourself with all operating

features and safety rules.

Common Features

Engine

The engine is powerful and easy to start. It is effectively

counterbalanced, which allows for less vibration and more

durability.

Dual Line

The dual line permits more efﬁcient cutting than a single

line.

Grass Deflector

The grass deﬂector helps protect you from ﬂying debris.

Ergonomic Design

The design of the product provides for easy handling. It is

designed for comfort when operating in different positions

and at different angles.

Brushcutter Features

(Model No. 51993)

Blade

The Tri-Arc

®

blade allows you to brushcut weeds, vines, and

light brush.

Brushcutter Guard

The brushcutter guard helps protect you from the blade and

from ﬂying debris.

Shoulder Strap

The brushcutter includes a shoulder strap that helps support

the product.

Barrier Bar

The handle on the brushcutter contains a barrier bar that

restrains the operator in position and maintains a proper

distance between the operator and the blade.

Features

11

Figure 1

Features

Barrier

Bar

Brushcutter

Guard

Shoulder

Strap

Trigger

Handle

Blade

Straight Shaft Trimmer

(Model No. 51973)

Engine

Trigger

Handle

Front Handle

Straight Shaft

Grass Deflector

Dual

Line

Engine

Front Handle

Brushcutter

(Model No. 51993)

Features

Straight Shaft

Grass Deflector

String Head

Assembly

12

Unpacking

This product requires assembly.

 Carefully remove the items from the box. Make sure

that all items listed in the packing list are included.

 Inspect the product carefully to make sure no breakage

or damage occurred during shipping.

 Do not discard the packing material until you have care-

fully inspected and satisfactorily operated the product.

 If any parts are damaged or missing, please call toll free

1-866-574-9242 for assistance.

Packing List

Upper Shaft (Power Head)

Attachment Shaft (Cutting Head)

Handle (Model No. 51973)

Handle with Barrier (Model No. 51993)

Straight Shaft Grass Deﬂector

String Head Assembly (Model No. 51993)

Oil

Head Locking Tool (Model No. 51993)

Shoulder Strap (Model No. 51993)

Hanger Cap

Operator’s Manual

Assembly

Unpacking

WARNING:

If any parts are damaged or missing, do not

operate the product until the parts are replaced.

Failure to heed this warning could result in seri

-

ous personal injury.

WARNING:

Do not attempt to modify this tool or create

accessories not recommended for use with this

tool. Any such alteration or modiﬁcation is

misuse and could result in a hazardous condition

leading to possible serious personal injury.

WARNING:

Do not start trimmer until assembly is complete.

Failure to comply could result in accidental

starting and possible serious personal injury.

13

Assembly

Connecting the Attachment to the

Upper Shaft

See Figure 2.

To connect the attachment to the upper shaft:

1. Loosen the knob by turning it counterclockwise.

2. Remove the end cap from the attachment shaft.

3. Align the button on the attachment shaft with the guide

recess on the upper shaft.

4. Slide the attachment shaft into the upper shaft until the

attachment shaft clicks into place.

Note: You may need to turn the attachment shaft to

properly align the two shafts.

5. Tighten the knob securely by turning it clockwise.

Removing the Attachment from the

Upper Shaft

See Figure 2.

Follow these steps to remove the attachment from the upper

shaft.

1. Loosen the knob by turning it counterclockwise.

2. Push the button while pulling out the attachment.

Attaching the Front Handle

See Figure 3.

To attach the front handle:

1. Remove the slotted Torx

™

screws to separate the handle

from the handle support.

2. Press the handle onto the top of the upper shaft, no

less than 10 in. (25.4 cm) from the center of the trigger

handle, angling the handle toward the trigger handle.

3. Place the handle along the upper shaft to a position that

allows for comfortable operation.

4. Place the handle support on the bottom of the tube on the

opposite side of the front handle.

5. Secure the handle with the slotted Torx

™

screws.

Assembly

Figure 2

Button

Attachment

Shaft

Guide

Recess

Upper

Shaft

Knob

Figure 3

Slotted

Torx

Screw

Front

Handle

Trigger

Handle

Barrier Bar

(Model Nos.

51993)

Handle

Support

14

Attaching the Grass Deflector

WARNING:

The line cutting blade on the grass deﬂector

is sharp. Avoid contact with the blade. Failure

to avoid contact can result in serious personal

injury.

Note: To protect the operator, always be sure to attach the

grass deﬂector.

To Attach the Straight Shaft Grass Deflector

See Figure 5.

To attach the straight shaft grass deﬂector:

1. Remove the screw from the grass deﬂector.

2. Insert the tab on the mounting bracket in the slot on the

grass deﬂector.

3. Align the screw hole in the mounting bracket with the

screw hole in the grass deﬂector.

4. Insert the screw through the mounting bracket and into

the grass deﬂector.

5. Tighten the screw securely.

Figure 5

Assembly

Straight Shaft

Grass Deflector

Tab

Slot

Attaching the Shoulder Strap

Model Nos. 51993

See Figure 4.

To attach the shoulder strap:

1. Connect the latch on the strap to the hanger bracket.

2. Adjust the strap to a comfortable position.

Note: To quickly release the product from the shoulder

strap, sharply pull the quick release tab.

Figure 4

Strap

Latch

Hanger

Bracket

Quick

Release

Tab

Assembly

15

Converting From Brushcutter To

Trimmer

Model No. 51993

To convert from the brushcutter to the trimmer, remove the

blade, remove the brushcutter guard, attach the grass deﬂec-

tor, and install the trimmer head assembly.

To Remove the Blade and Brushcutter Guard

See Figures 6 and 7.

To remove the blade and brushcutter guard:

1. Align the slot in the ﬂanged washer with the slot in the

gear head.

2. Place the head locking tool through the slot in the

ﬂanged washer and gear head.

3. Remove the blade nut by turning it clockwise (left-hand-

ed threads).

4. Remove the cupped washer and the blade.

WARNING:

Be careful when handling the blade. It is sharp.

Failure to heed this warning can result in serious

personal injury.

5. Remove the ﬂanged washer from the gear shaft and

retain it for the trimmer head assembly installation.

6. Remove the three screws securing the brushcutter guard.

7. Remove the brushcutter guard.

Note: Store the brushcutter parts together for future use.

To Attach the Grass Deflector

See To Attach the Straight Shaft Grass Deﬂector earlier

in this manual.

To Install the Trimmer Head Assembly

See Figure 8.

To install the trimmer head assembly:

1. Align the slot in the ﬂanged washer with the slot in the

gear head.

2. Insert the head locking tool through the ﬂanged washer

and gear head.

3. Install the drive shaft and trimmer head assembly onto

the gear shaft by turning the drive shaft counterclockwise

(left-handed threads).

4. Tighten the drive shaft securely.

Figure 6

Figure 8

Assembly

Head

Locking

Tool

Figure 7

Slot

Gear Head

Brushcutter

Guard

Flanged

Washer

Blade

Blade Nut

Slot

Cupped

Washer

Gear

Head

Trimmer

Head

Assembly

Drive

Shaft

Flanged

Washer

Assembly

Slot

16

Converting From Trimmer To Brushcutter

Model No. 51993

To convert from the trimmer to the brushcutter, remove the

trimmer head assembly, remove the grass deﬂector, attach

the brushcutter guard, and install the blade.

To Remove the Trimmer Head Assembly and Grass

Deflector

See Figures 9 and 10.

To remove the trimmer head assembly and grass deﬂector:

1. Align the slot in the ﬂanged washer with the slot in the

gear head.

2. Insert the head locking tool through the ﬂanged washer

and gear head.

3. Remove the drive shaft and trimmer head assembly by

turning the drive shaft clockwise (left-handed threads).

4. Remove the ﬂanged washer and retain it for the blade

installation.

5. Remove the screw securing the grass deﬂector.

6. Remove the grass deﬂector.

Note: Store the trimmer head assembly parts together

for future use.

To Attach the Brushcutter Guard

See Figure 11.

Note: To protect the operator, always be sure to attach the

brushcutter guard.

To attach the brushcutter guard:

1. Place the guard onto the gear head as shown.

2. Insert the three hex head screws from the bottom through

the guard into the gear head.

3. Tighten the screws securely and torque to 40-50 in.lb.

To Install the Blade

See Figure 12.

To install the blade:

1. Place ﬂanged washer over the gear shaft with the hollow

side toward the brushcutter guard.

2. Center the blade on the ﬂanged washer, making sure the

blade ﬁts ﬂat and the raised hub goes through the hole in

the blade.

3. Install the cupped washer with the raised center away

from the blade.

4. Place the blade nut onto the gear shaft.

5. Insert the head locking tool through the ﬂanged washer

and gear head.

6. Install the blade nut by turning it counterclockwise (left-

handed threads).

7. Tighten the blade nut and torque to 120 in.lb. minimum

(ﬁnger tight plus 1/2 turn).

Figure 9

Figure 10

Figure 11

Figure 12

Assembly

Head

Locking

Tool

Gear

Head

Trimmer

Head

Assembly

Drive

Shaft

Flanged

Washer

Straight Shaft

Grass Deflector

Slot

Gear Head

Brushcutter

Guard

Hex Head

Screw

Brushcutter

Guard

Flanged

Washer

Blade

Blade Nut

Cupped

Washer

Gear Shaft

Assembly

17

Operation

Mixing the Fuel

DANGER:

Gasoline is extremely ﬂammable and explosive.

A ﬁre or explosion from gasoline will burn you

and others.

This product is powered by a 2-cycle engine and requires pre-

mixing gasoline and 2-cycle oil. The oil mix should be 50:1,

using oil that meets or exceeds JASO-FC speciﬁcations.

Follow these steps to mix the fuel.

1. Obtain a clean container that is approved for use with

gasoline.

2. Mix the 2-cycle engine oil provided with unleaded gaso-

line in the container, according to the instructions on the

oil carton.

Note: This engine is certiﬁed to operate on unleaded gaso-

line intended for automotive use with an octane rating of 87

[(R + M) / 2] or higher. Do not use automotive oil or 2-cycle

outboard oil. Store the container out of the reach of children.

Filling the Tank

WARNING:

Always stop the engine before ﬁlling the tank.

Never add fuel to a machine with a running or

hot engine. Move at least 30 ft. (9 m) away from

the refueling site before starting the engine. Do

not smoke while ﬁlling the tank.

To ﬁll the tank:

1. Clean the surface around the fuel cap to prevent contami-

nation.

2. Loosen the fuel cap by turning it counterclockwise.

3. Pour the fuel mixture carefully into the tank.

4. Clean and inspect the gasket.

Note: Replace the fuel cap if the gasket is damaged.

5. Install the fuel cap and tighten it by turning it clockwise.

WARNING:

Check for fuel leaks. If you ﬁnd any leaks,

correct the problem before using the product.

6. Wipe spilled fuel from the product.

7. Move at least 30 ft. (9 m) away before starting the

product.

Note: It is normal for the engine to emit smoke during

use.

WARNING:

Do not allow familiarity with tools to make you

careless. Remember that a careless fraction of a

second is sufﬁcient to inﬂict serious injury.

WARNING:

Always wear safety goggles or safety glasses

with side shields when operating power tools.

Failure to do so could result in objects being

thrown into your eyes resulting in possible seri

-

ous injury.

WARNING:

Do not use any attachments or accessories not

recommended by the manufacturer of this tool.

The use of attachments or accessories not rec-

ommended can result in serious personal injury.

Applications

You may use this tool for the purposes listed below:

 Cutting grass, weeds, and light undergrowth

(all models)

 Edging along sidewalks and driveways (all models)

 Cutting pulpy weeds, vines, and light brush

(Model No. 51993)

50:1 Gasoline to Oil Mixing Chart

Gasoline Oil

1/2 US gallon 1.3 oz.

1 US gallon 2.6 oz.

2 US gallons 5.2 oz.

1 liter 20 ml

2 liters 40 ml

3 liters 60 ml

4 liters 80 ml

5 liters 100 ml

+ =

18

WARNING:

The product may throw objects during opera-

tion, causing injury to the operator or to by-

standers. Always wear suitable eye protection,

long heavy pants, and boots while operating the

product.

Starting the Product

See Figures 13-15.

Starting the product differs depending on whether the engine

is cold or warm. Refer to the label on the air ﬁlter cover.

To Start a Cold Engine

To start a cold engine:

1. Lay the product on a ﬂat, bare surface.

2. Toggle the switch to the I (ON) position.

3. Push the primer bulb up to eight times.

4. Set the choke lever to FULL (Choke Closed).

5. Squeeze throttle trigger fully (thru step 7) and pull starter

handle sharply (no more than 4x).

6. Set the choke lever to HALF (Choke Open).

7. Pull starter handle until engine runs, no more than 6

pulls.

8. Run the engine at full throttle for 20 seconds, then set the

choke lever to RUN.

Note: In cooler environments, additional pulls of the

starter handle may be required with the choke lever in the

FULL position.

Figure 14

To Start a Warm Engine

To start a warm engine:

1. Lay the product on a ﬂat, bare surface.

2. Toggle the switch to the I (ON) position.

3. Push the primer bulb up to eight times.

4. Set the choke lever to RUN (Choke Open).

5. Pull the starter cord.

Note: If the product does not start, repeat the previous

steps.

Stopping the Product

See Figure 15.

To stop the product.

1. Release the trigger.

2. Toggle the switch to the O (OFF) position.

Figure 15

Operation

Figure 13

Lock-off

Button

Switch

Starter

Cord

Trigger

Primer

Bulb

Trigger

Switch

Set Choke to FULL

Set Choke to RUN

Operation

19

Operating the Trimmer

WARNING:

Always hold the string trimmer away from the

body, keeping clearance between the body and

the product. Any contact with the housing or

string trimmer cutting head can result in burns

and/or other serious personal injury.

To Operate the Straight Shaft Trimmer

(Model No. 51973)

See Figure 16a.

To operate the straight shaft trimmer:

1. Start the trimmer.

2. Hold the trimmer at waist level with your right hand on

the trigger handle and your left hand on the front handle.

3. Place the product on the right side of your body with the

engine behind and away from your body.

4. Trim grass and weeds in a left-to-right motion with the

line parallel to the ground.

Figure 16a

Figure 16b

Operation

To Advance the Cutting Line

See Figure 16b.

To advance the cutting line:

1. Start the trimmer.

2. Tap the retaining cap lightly on the ground while the mo-

tor is running. The line will only advance with the engine

at full throttle. Do not hold the retaining cap on the

ground.

Note: The line cutting blade on the grass deﬂector will

cut the line to the proper length.

Note: To help prevent line tangle, tap only once to

lengthen the line. If additional line is required, wait a few

seconds before retapping the retaining cap. Do not allow

the line to wear too short. Keep the cutting line at full

length.

Retaining

Cap

PROPER OPERATING

POSITION

Operation

20

Operating the Brushcutter

(Model No. 51993)

See Figure 17.

To operate the brushcutter:

1. Start the brushcutter.

2. Hold the brushcutter at waist level with your right hand

(arm extended) on the trigger handle and your left hand

on the front handle.

3. Place the product on the right side of your body with the

engine behind and away from your body.

4. Brushcut weeds and vines in a right-to-left motion with

the blade parallel to the ground.

Figure 17

Operation

Cutting Tips

See Figure 18.

1. Avoid hot surfaces by always keeping the tool away

from your body. (Proper operating position is shown in

Figures 16a and 17.)

2. Keep the trimmer tilted toward the area being cut; this is

the best cutting area.

3. The straight shaft trimmer cuts when passing the unit

from left to right. This will avoid throwing debris at the

operator. Avoid cutting in the dangerous area shown in

ﬁgure 18.

4. Use the tip of string to do the cutting; do not force string

head into uncut grass.

5. Wire and picket fences cause extra string wear, even

breakage. Stone and brick walls, curbs, and wood may

wear string rapidly.

6. Avoid trees and shrubs. Tree bark, wood moldings, sid-

ing, and fence posts can easily be damaged by the string.

Figure 18

Straight Shaft Trimmer

Dangerous

Cutting Area

Direction of

Rotation

Best Cutting

Area

PROPER OPERATING

POSITION

Operation

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