Ryobi 790r User guide

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FOR QUESTIONS, CALL 1-800-345-8746 in U.S. or

1-800-265-6778 in CANADA

www.ryobi.com

IMPORTANT MANUAL DO NOT THROW AWAY

OPERATOR’S MANUAL

2-Cycle Gas Trimmer/Brushcutter

780r–790r

THANK YOU

Thank you for buying this quality product. This modern outdoor power tool will provide many hours of useful service. You will find it to be a great labor-saving device. This operator’s manual provides you with easy-to-understand operating instructions. Read the whole manual and follow all the instructions to keep your new outdoor power tool in top operating condition. The other manual that came with your power tool, the parts manual, contains all the information that you need to order parts.

PRODUCT REFERENCES, ILLUSTRATIONS AND SPECIFICATIONS

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.

Click-Link® is a registered trademark of Ryobi Outdoor Products.

Bump Head™ is a trademark of Ryobi Outdoor Products.

SERVICE INFORMATION

Service on this unit both within and after the warranty period should be performed only by an authorized and approved service dealer. Dial:

1-800-345-8746

in the United States or

1-800-265-6778

in Canada

to obtain the listing of the authorized service dealer nearest you.

DO NOT RETURN THE UNIT TO THE RETAILER.

NOTE: PROOF OF PURCHASE WILL BE

REQUIRED FOR WARRANTY SERVICE.

Make sure this manual is carefully read and understood before starting or operating this equipment.

THIS PRODUCT IS COVERED BY ONE OR MORE OF THE US PATENTS LISTED BELOW: 5,076,149; 4,901,682; 4,779,405; 4,651,422; 4,505,040; 4,463,498; 4,369,742; 4,342,236; 4,223,441; 2,125,688; D-249,012; D-239,329;

OTHER PATENTS PENDING.

INTRODUCTION

TABLE OF CONTENTS

I. California Emission Regulations . . . . . . . . 3

II. Rules for Safe Operation . . . . . . . . . . . 4-9

A. Important Safety Information . . . . . . .4-6

B. Safety and International Symbols . . .7-8

C. Know Your Unit . . . . . . . . . . . . . . . . . .9

III. Assembly Instructions . . . . . . . . . . . 10-14

A. Installing and Adjusting J-Handle . . . .10

B. Installing the Harness . . . . . . . . . . . . .11

C. Removing and Installing Cutting . . . . . .

Attachment Shield . . . . . . . . . . . . . . 11

D. Remove the Cutting Attachment and . . .

Install the Cutting Blade . . . . . . . .12-13

E. Remove the Cutting Blade and . . . . . . .

Install the Cutting Attachment . . . . . . .14

IV. Oil and Fuel Information . . . . . . . . . . . . . 15

V. Starting/Stopping Instructions . . . . . . . . 16

VI. Operating Instructions . . . . . . . . . . . 17-20

A. Operating Click-Link System (790r) . . .17

B. Holding the Trimmer . . . . . . . . . . . . . .18

C. Adjusting Trimming Line Length . . . . .18

D. Tips for Best Trimming Results . . . . . .19

E. Decorative Trimming . . . . . . . . . . . . . .19

F. Cutting Blade Operating Tips . . . . .19-20

VII. Maintenance and Repair Instructions .20-26

A. Maintenance Schedule . . . . . . . . . . . 20

B. Line Installation . . . . . . . . . . . . . . 21-22

C. Installing a Prewound Reel . . . . . . . . . 23

D. Air Filter Maintenance . . . . . . . . . . 23-24

E. Air Filter/Muffler Cover Removal . . . .23

F. Cleaning the Air Filter . . . . . . . . . . . . 24

G. Reinstalling the Air Filter/Muffler Cover 24

H. Carburetor Adjustment . . . . . . . . . . . 25

I. Replacing the Spark Plug . . . . . . . . . 26

J. Accessories/Replacement parts . . . . . 26

VIII. Cleaning and Storage . . . . . . . . . . . . . . 27

X. Troubleshooting Chart . . . . . . . . . . . . . . 28

XI. Specifications . . . . . . . . . . . . . . . . . . . . 29

XII. Warranty . . . . . . . . . . . . . . . . . . . . . .31-32

CONTENTS OF CARTON

This unit should consist of the following:

• Model 780r or Model 790r Trimmer/Brushcutter J-Handle and Hardware Cutting Attachment Shield and Hardware Blade with Cover and Hardware

• Bottle of 2-Cycle Oil

• Operator's Manual

• Parts Manual

• Product Registration Card

• Locking Rod

• Shoulder Strap

These items may be in the hardware bag or

assembled on your unit.

WARNING!

SPARK ARRESTOR

WARNING

CALIFORNIA EMISSION REGULATIONS

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 states 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 grasscovered 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 not factory equipped with a spark arrestor. If these items are required in your area, ask your LOCAL SERVICE dealer to install the Optional Accessory Part #180030 Spark Arrestor Kit.

FOR QUESTIONS, CALL 1-800-345-8746 IN U.S. OR 1-800-265-6778 in CANADA

California Proposition 65 Warning:

THE ENGINE EXHAUST FROM THIS

PRODUCT CONTAINS CHEMICALS

KNOWN TO THE STATE OF

CALIFORNIA TO CAUSE CANCER,

BIRTH DEFECTS OR OTHER

REPRODUCTIVE HARM.

This unit meets the 1995 to 1998 California emissions regulations for small off-road engines. These units are identified by the label on the engine of your product. A typical identification label is shown.

To ensure that your unit continues to meet these regulations, refer to the following information and instructions in this operator’s manual.

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.

RULES FOR SAFE OPERATION

• Clear the area to be cut before each use. Remove all objects such as rocks, broken glass, nails, wire, or string which can be thrown or become 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; there still may be a risk to bystanders from thrown objects. Bystanders should be encouraged to wear eye protection. If you are approached, stop the engine and cutting attachment immediately.

• Squeeze the throttle control and check that it returns automatically to the neutral position. Make all adjustments or repairs before using unit.

SAFETY WARNINGS FOR GAS TRIMMERS

WARNING: Gasoline is highly flammable, and its vapors can explode if ignited. Take the following precautions:

• 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.

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.

• Inspect the unit before 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 positioned as recommended. Failure to so can result in personal injury to the operator and bystanders, as well as damage to the unit

• Use only 0.095 in (2.41 mm) diameter genuine Ryobi replacement line. Never use metal-reinforced line, wire, or rope, etc.. These can break off and become a dangerous projectile.

• Be aware of the risk of injury to the head, hands and feet.

• IMPORTANT SAFETY INFORMATION •

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.

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.

SYMBOL MEANING

SAFETY ALERT SYMBOL:

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.

NOTE: Advises you of information or

instructions vital to the operation or maintenance of the equipment.

RULES FOR SAFE OPERATION

• 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. Loosen the fuel tank cap slowly to relieve any pressure in the tank.

• Mix and add fuel in a clean, well-ventilated area outdoors where there are no sparks or flames. Slowly remove the fuel cap only after stopping engine. Do not smoke while fueling or mixing fuel. Wipe up any spilled fuel from the unit immediately.

• Move the unit at least 30 ft. (9.1 m) from the fueling source and site before starting the engine. Do not smoke, keep sparks and open flames from 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 area outdoors.

• Wear safety glasses or goggles that are marked as meeting ANSI Z87.1-1989 standards, and 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 attachment shield must always be in place while operating the unit as a trimmer. 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.

• This unit has a clutch. The cutting attachment remains stationary when the engine is idling. If it does not, have the unit adjusted by an authorized service technician.

• Adjust the J-handle to your size to provide the best grip.

• Be sure the cutting attachment 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 attachment when it is rotating.

• Do not touch the engine or muffler. These parts get extremely hot from operation. When turned off they remain hot for a short time.

• 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.

• Always stop the engine when cutting is delayed or when walking from one cutting location to another.

• If you strike or become 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 attachment or other attachments.

• Use only genuine Ryobi replacement parts when servicing this unit. These parts are available from your authorized service dealer. Do not use parts, accessories or attachments not authorized by Ryobi for this unit. Doing so could lead to serious injury to the user, or damage to the unit, and void your warranty.

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

• To reduce fire hazard, replace faulty muffler and spark arrestor, keep the engine and muffler free from grass, leaves, excessive grease or carbon build up.

RULES FOR SAFE OPERATION

WHILE OPERATING WITH CUTTING BLADE

• Read and understand all safety warnings before operating this unit.

• Always use the shoulder harness when using the brush blade accessory.

• Keep the handle between the operator and cutting attachment or blade at all times.

• NEVER cut with the cutting blade located over 30 inches (76 cm) or more above the ground level.

• Blade thrust may occur when the spinning blade contacts an object that it does not immediately cut. Blade thrust can be violent enough to cause the unit and/or operator to be propelled in any direction , and possibly lose control of the unit. 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.

• For operation with the brush blade, do not cut anything thicker than 1/2 inch or a violent kickback could occur.

• Do not attempt to touch or stop the blade when it is rotating.

• A coasting blade can cause injury while it continues to spin after the engine is stopped or the throttle trigger is released. Maintain proper control until the blade has completely stopped rotating.

• Do not run the unit at high speed when not cutting.

• If you strike or become entangled with a foreign object, stop the engine immediately and check for damage. Have any damage repaired before attempting further operations. Do not operate unit with a bent, cracked or dull blade. Discard blades that are bent, warped, cracked or broken.

• Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury. Replace the blade.

• Stop the engine IMMEDIATELY if you feel excessive vibration. Vibration is a sign of trouble. Inspect thoroughly for loose nuts, bolts or damage before continuing. Repair or replace affected parts as necessary.

AFTER USE

• Clean cutting blades with a household cleaner to remove any gum buildup. Oil the blade with machine oil to prevent rust.

• Lock up and store the cutting blade in an appropriate area to protect the blade from unauthorized use or damage.

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 locked up and dry, or high and dry place to prevent unauthorized use or damage. Keep 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 Cleaning and Storage instructions.

• Keep these instructions. Refer to them often and use them to instruct other users. If you loan someone this unit, also loan them these instructions.

SAVE THESE INSTRUCTIONS

WARNING: The operation of any power tool can cause foreign objects to be

thrown into your eyes. This can lead to severe eye damage. Before commencing power tool operation, always wear safety glasses or goggles that are marked as meeting ANSI Z87.1-1989 standards, and a full face shield when needed.

RULES FOR SAFE OPERATION

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 and maintenance and repair information.

• WARNING - READ OPERATOR'S MANUAL

Failure to follow operating instructions and safety precautions in the operator's manual can result in serious injury. Read the operator's manual before starting or operating this unit.

• SAFETY ALERT SYMBOL

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

• PRIMER BULB

Push primer bulb, fully and slowly, 5 to 7 times.

• KEEP BYSTANDERS AWAY

WARNING: Keep all bystanders, especially children and pets,

at least 50 feet (15 m.) from the trimming area.

• INDICATES OIL

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

• UNLEADED FUEL

Always use clean, fresh unleaded fuel.

• FOR SERVICE INFORMATION, CALL:

USA: 1-800-345-8746 CANADA: 1-800-265-6778

• WEAR EYE AND HEARING PROTECTION

WARNING: Thrown objects and loud noise can cause severe eye

injury and hearing loss. Wear eye protection meeting ANSI Z87.11989 standards and ear protection when operating this unit.

• SHARP BLADE

WARNING: There is a sharp blade on the cutting attachment

shield. To prevent serious injury, do not touch blade.

MEANING

SYMBOL

RULES FOR SAFE OPERATION

• THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY

WARNING: Do not operate without the cutting attachment

shield in place. Keep away from the rotating cutting attachment.

• ON/OFF STOP CONTROL

ON / START / RUN

• ON/OFF STOP CONTROL

OFF OR STOP

• 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.

• TRIMMER/BRUSHCUTTER SAFETY

WARNING: Thrown objects and rotating cutter can cause

severe injury. Keep bystanders, especially children and pets, at least 50 feet (15 m.) away from the cutting area. The cutting attachment shield must be used when using the trimmer cutting attachment.

• BRUSHCUTTERS Replace dull blade.

Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury.

SYMBOL

MEANING

• CHOKE CONTROL

A • FULL CHOKE position. B • PARTIAL CHOKE position. C • RUN position.

On/Off Stop Control

RULES FOR SAFE OPERATION

KNOW YOUR UNIT

APPLICATIONS

As a trimmer;

• Cutting grass and light weeds.

• Edging

• Decorative trimming around trees,

fences, etc.

As a brushcutter;

• Cutting weeds and light bush of up to 1/2 inch in diameter.

Other accessories may be used with the 790r. See list of add-ons on page 17.

Handle Hardware

Primer Bulb

Air filter/Muffler Cover

Fuel Cap

Throttle Control

Power Head

Choke Lever

J-handle

Click-Link (790r only)

Line Cutting Blade

Cutting Attachment

Shaft Housing

Shaft Grip

Spark Plug

Cutting Attachment Shield

Starter Rope

Support Fitting

Cutting Blade with Cover

ASSEMBLY INSTRUCTIONS

INSTALLING AND ADJUSTING THE J-HANDLE

1. Place the J-handle between the top and middle clamp pieces (Fig. 1).

(4) Screws

Top Clamp

J-Handle

Middle Clamp

Bottom Clamp

Nuts

2. While holding the three pieces together, install the four (4) screws through the top clamp and into middle clamp.

NOTE: The holes in the top and middle clamp

will line up only when assembled correctly.

3. Place the clamps and j-handle the over the shaft housing and onto the bottom clamp.

4. Hold each hex nut in the bottom clamp recess with a finger. Start screws with a large Phillips screwdriver. Do not tighten until you make the handle adjustment.

5. Slide the J-handle in or out until the arrow/white line on the decal touches the clamp assembly (Fig. 2).

Fig. 1

7. Tighten the clamp screws evenly, until the J-handle is secure.

6. While holding the unit in the operating position (Fig. 3), position the J-handle to the location that provides you the best grip.

Fig. 3

Decal

Fig. 2

Install the cutting attachment shield when using the unit as a grass trimmer.

WARNING: To avoid serious

personal injury, the cutting attachment shield SHALL be in place at all times while operating the unit as a grass trimmer.

Install the cutting attachment shield on the shield mount by inserting the three (3) screws into the shield mount. Tighten securely with a flat blade screwdriver (Fig. 7).

ASSEMBLY INSTRUCTIONS

REMOVING AND INSTALLING CUTTING ATTACHMENT SHIELD

Remove the cutting attachment shield when using the unit as a brushcutter.

WARNING: The cutting attachment

shield should NOT be installed when operating the unit with a blade. Remove the cutting attachment shield before removing or installing the blade.

Remove the cutting attachment shield from the shield mount by removing the three (3) screws with a flat blade screwdriver (Fig. 7). Store parts for future use.

3. Snap it on to the support fitting (Fig. 5).

INSTALLING THE HARNESS

WARNING: Always use the shoulder

harness when using the cutting blade to avoid serious personal injury.

1. Push the strap through the center of the buckle.

2. Pull the strap over the cross bar and down through the slot in the buckle (Fig. 4).

(3) Screws

Cutting Attachment Shield

Shield Mount

Fig. 4

Fig. 5

Fig. 7

Support Fitting

Fig. 6

4. Adjust length to fit the operator’s size. Pull tab to lengthen, pull strap to shorten (Fig 6).

4. Center the cutting blade on the pilot step of the output shaft bushing (Fig. 11).

Guard Mount

Fig. 10

ASSEMBLY INSTRUCTIONS

Install the Cutting Blade

WARNING: To avoid serious

personal injury, always wear gloves while handling or installing the blade.

3. Place the cutting blade on the output shaft (Fig. 10).

Cutting Attachment

Locking Rod

Cutting

Blade

Blade Retainer

Nut

Locking Rod Slot

Blade Cover

Locking Rod

REMOVING THE CUTTING ATTACHMENT AND INSTALLING THE CUTTING BLADE

NOTE: To make removing or installing the

cutting blade or cutting attachment easier, place the unit on the ground or on a work bench.

Remove the Cutting Attachment Shield

See Removing and Installing Cutting

Attachment Shield, Pg. 11.

Remove the Cutting Attachment

WARNING: The gear housing gets

hot with use and can result in injury to the operator. When the unit is turned off it remains hot for a short time. Do not touch the gear housing until it has cooled.

1. Align the shaft bushing hole with the locking rod slot and insert the locking rod into the shaft bushing hole (Fig. 8).

Fig. 9

Output Shaft

Pilot Hole

Fig. 8

Shaft Bushing

Hole

Locking

Rod Slot

Output Shaft

Bushing

Locking Rod

Output Shaft

Pilot Step

2. While holding the locking rod, remove the cutting attachment by turning it clockwise off of the output shaft (Fig. 9). Store the cutting attachment for future use.

Fig. 11

Output Shaft

Bushing

Output Shaft

5. Make sure that the cutting blade is centered on the pilot step and sitting flat against the output shaft bushing (Fig. 12).

WARNING: If the cutting blade is off-center, the unit will vibrate, and the blade may fly off, which can cause serious personal injury.

ASSEMBLY INSTRUCTIONS

6. Align the shaft bushing hole with the locking rod slot and insert the locking rod into the bushing hole (Fig. 8).

7. Put the blade retainer and nut on the output shaft. Make sure that the blade is installed correctly.

8. Tighten counterclockwise against the blade while holding the locking rod (Fig. 13).

Fig. 12

9. Remove the locking rod from the locking rod slot.

WARNING: To avoid serious personal injury or damage to the unit, do not start or operate this unit with the

locking rod in the locking rod

slot.

10.Remove the cutting blade cover by un-snapping the plastic lock on the cover and pulling it from the blade. Store the cover for future use.

WARNING: Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury. Replace the blade.

NOTE: A replacement cutting blade,

Part # 145873 can be purchased from you local authorized dealer.

1/4-1/2 turn

Counterclockwise

Fig. 14

Fig. 13

Counterclockwise

Pilot Step

• If using a torque wrench and an 5/8 inch socket tighten to;

325 - 335 in•lb, 27 - 28 ft.•lb, 37 -38 N•m.

• Without a torque wrench, use a 5/8 inch closed-end or socket wrench, turning the nut until the blade retainer is snug against the shaft bushing. Make sure that the blade is installed correctly, then rotate the nut an additional 1/4 to 1/2 turn counterclockwise (Fig. 14).

ASSEMBLY INSTRUCTIONS

Cutting Attachment

Locking Rod

4. Remove the nut, blade retainer, and blade. Store the nut and blade together for future use in a secure place. Store out of reach of children.

Install the Cutting Attachment

5. Align the shaft bushing hole with the locking rod slot and insert the locking rod into the shaft bushing hole. (Fig. 15). Place the blade retainer on the output shaft with the flat surface against the output shaft bushing as shown in Fig. 17. Screw the cutting attachment counterclockwise onto the output shaft. Tighten securely.

NOTE: The

blade retainer must be installed on the output shaft in the position shown for the cutting attachment to work correctly.

Fig. 17

clockwise

Fig. 16

REMOVE THE CUTTING BLADE AND INSTALL THE CUTTING ATTACHMENT

Remove the Cutting Blade

WARNING: To avoid serious

personal injury, always wear gloves while handling or installing the blade.

1. Install the cutting blade cover. Pull the cover around the blade and click the plastic lock.

2. Align the shaft bushing hole with the locking rod slot and insert the locking rod into the bushing hole (Fig. 15).

6. Remove the locking rod.

7. Install the cutting attachment shield. See

Removing and Installing Cutting Attachment Shield, Pg. 11.

WARNING: To avoid serious

personal injury, the cutting attachment shield SHALL be in place at all times while operating the unit as a grass trimmer.

3. While holding the locking rod, loosen the nut on the blade by turning it clockwise with a 5/8 inch closed-end or socket wrench (Fig. 16).

Fig. 15

Shaft Bushing

Hole

Locking

Rod Slot

Output Shaft

Bushing

Locking Rod

Output Shaft

Blade Retainer

Output Shaft

Bushing

WARNING: Gasoline is extremely

flammable. Ignited Vapors may explode. Always stop the engine and allow it to cool before filling the fuel tank. Do not smoke while filling the tank. Keep sparks and open flames at a distance from the area.

WARNING: Remove fuel cap slowly to avoid injury from fuel spray. Never operate the unit without the fuel cap securely in place.

WARNING: Add fuel in a clean, well ventilated area outdoors. Wipe up any spilled fuel immediately. Avoid creating a source of ignition for spilt fuel. Do not start the engine until fuel vapors dissipate.

NOTE: Dispose of the old fuel/oil mix in

accordance to Federal, State, and Local regulations.

OIL AND FUEL MIXING INSTRUCTIONS

Old and/or improperly mixed fuel are the main reasons for the unit not running properly. Be sure to use fresh, clean

unleaded fuel. Follow the instructions carefully for the proper fuel/oil mixture.

Definition of Blended Fuels

Today's fuels are often a blend of gasoline and oxygenates such as ethanol, methanol or MTBE (ether). Alcohol-blended fuel absorbs water. As little as 1% water in the fuel can make fuel and oil separate. It forms acids when stored. When using alcohol-blended fuel, use fresh fuel (less than 60 days old).

Using Blended Fuels

If you choose to use a blended fuel, or its use is unavoidable, follow recommended precautions.

• Always use fresh fuel mix per your operator's manual.

• Use the fuel additive STA-BIL®or an equivalent.

• Always agitate the fuel mix before fueling the unit.

• Drain the tank and run the engine dry before storing the unit.

Using Fuel Additives

The use of fuel additives, such as STA-BIL®Gas Stabilizer or an equivalent, will inhibit corrosion and minimize the formation of gum deposits. Using a fuel additive can keep fuel from forming harmful deposits in the carburetor for up to six (6) months. Add 0.8 oz. (23 ml.) of fuel additive per gallon of fuel according to the instructions on the container. NEVER add fuel additives directly to the unit's fuel tank.

CAUTION: For proper engine operation and maximum reliability, pay strict attention to the oil and fuel mixing instructions on the 2-cycle oil container. Using improperly mixed fuel can severely damage the engine.

OIL AND FUEL INFORMATION

Thoroughly mix the proper ratio of 2-cycle engine oil with

unleaded gasoline in a separate fuel can. Use a 32:1 fuel/oil ratio. Do not mix them directly in the engine fuel tank. See the table below for specific gas and oil mixing ratios.

NOTE: One gallon (3.8 liters) of unleaded

gasoline mixed with one 4 oz. (120 ml.) bottle of RYOBI 2 Cycle OIL makes a 32:1 fuel/oil ratio.

UNLEADED GAS RYOBI 2 CYCLE OIL

1 US. GALLON +4.0 FL. OZ.

(3.8 LITERS) (120 ml)

1 LITER

+ 30 ml

MIXING RATIO - 32:1

STARTING/STOPPING INSTRUCTIONS

4. Place the choke lever in the FULL choke position (A) (Fig. 19).

8. If the engine does not start, repeat steps 4 through 7.

NOTE: If the engine floods while trying to

start, place the choke lever in the RUN position (C). Squeeze the throttle control. Pull the starter rope briskly. The engine should start within three (3) to eight (8) pulls.

9. Squeeze the throttle control to warm up engine for 5 to 10 seconds. Place the choke lever in the RUN position (C) (Fig. 19).

NOTE: Choking is unnecessary when starting

a warm engine.

Put the On/Off Stop

Control in the ON position (Fig. 18), and

start in PARTIAL Choke position

(B) (Fig. 19).

WARNING: Operate this unit only

in a well ventilated area outdoors. Carbon monoxide exhaust fumes can be lethal in a confined area.

STOPPING INSTRUCTIONS

1. Release your hand from the throttle control (Fig. 20). Allow the engine to cool down by idling.

2. Put the On/Off Stop Control in the OFF position (Fig. 18).

STARTING INSTRUCTIONS

WARNING: Avoid accidental

starting. Be in the starting position when pulling the starter rope (Fig. 20). The operator and unit must be in a stable position while starting to avoid serious personal injury.

1. Mix gas with oil. Fill fuel tank with fuel/oil

mixture. See Oil and Fuel Mixing Instructions on Pg.15.

2. Put the On/Off Stop Control in the ON

position (Fig. 18).

Choke Lever

Full Choke

Position (A)

Run

Position (C)

Partial Choke

Position (B)

Starter Rope

Throttle Control

On/Off Stop Control

5. With the unit on the ground, squeeze the throttle control and hold. Pull starter rope briskly (Fig. 20). Continue pulling until the engine sounds as though it wants to run (normally 2 to 5 pulls).

NOTE: Squeeze the throttle control until the

engine has started and warmed up.

6. Place the choke lever in the PARTIAL choke position (B) (Fig. 19).

7. Pull starter rope briskly 1 to 3 times to start the engine (Fig. 20).

Fig. 18

Fig. 19

Fig. 20

Primer Bulb

3. Fully press and release primer bulb slowly 5 to 7 times. Fuel should be felt and visible in the bulb (Fig. 19). If fuel hasn’t entered the bulb, press three more times, or until it does.

CAUTION: The cutting attachment and add-ons with the Click-Link

system are to be used in the primary hole unless stated otherwise in the specific add-ons operator’s manual. Using the wrong hole could lead to personal injury, or damage to the unit.

NOTE: For edging with Click-Link®models,

lock the release button of the cutting attachment into the 90° edging hole or the 180° edging hole (Fig. 23).

OPERATING INSTRUCTIONS

2. While firmly holding the add-on, push it straight into the Click-Link®coupler (Fig. 22).

NOTE: Aligning the release button with the

guide recess will help installation (Fig. 21).

3. Turn the knob clockwise to tighten (Fig. 23).

CAUTION: Lock the release button in the primary hole and securely tighten the knob before operating this unit.

OPERATING THE CLICK-LINK

SYSTEM - MODEL 790r

The model 790r Click-Link®system enables the use of these optional add-ons.

Blower/Vacuum . . . . . . . . . . . . . . . . . . BV720r

Cultivator . . . . . . . . . . . . . . . . . . . . . . . GC720r

Edger . . . . . . . . . . . . . . . . . . . . . . . . . . LE720r

Hedgetrimmer . . . . . . . . . . . . . . . . . . . HS720r

Snowthrower . . . . . . . . . . . . . . . . . . . . ST720r

Straight Shaft Trimmer . . . . . . . . . . . . . SS725r

Sweeper/Blower . . . . . . . . . . . . . . . . . . SB720r

Tree Pruner . . . . . . . . . . . . . . . . . . . . . . TP720r

Turbo Blower . . . . . . . . . . . . . . . . . . . . TB720r

WARNING: Read and understand operator’s manual for add-on prior to operation.

Removing the Cutting Attachment or Add-Ons:

1. Turn the knob counterclockwise to loosen (Fig. 21).

2. Press and hold the release button (Fig. 21).

3. While firmly holding the upper shaft housing, pull the cutting attachment or add-on straight out of the Click-Link®coupler (Fig. 22).

Installing the Cutting Attachment or Add-Ons:

WARNING: To avoid serious

personal injury, shut unit off before removing or installing add-ons.

NOTE: To make installing or removing the

add-on easier, place the unit on the ground or on a work bench.

1. Turn knob counterclockwise to loosen (Fig.21).

Click-Link®Coupler

Release Button

Guide Recess

Knob

Primary Hole

Upper Shaft Housing

Lower Shaft Housing

Release Button

90˚ Edging Hole

180˚ Edging Hole

Knob

Fig. 21

Fig. 22

Fig. 23

Click-Link®Coupler

HOLDING THE TRIMMER

WARNING: Always wear eye,

hearing, foot and body protection to reduce the risk of injury when operating this unit.

Before operating the unit, stand in the operating position (Fig. 24). Check for the following:

• The operator is wearing eye protection and proper clothing.

• The right arm is slightly bent, and the hand is holding the shaft grip.

• The left arm is straight, and the hand is holding the handle.

• The unit is below waist level.

• The cutting attachment is parallel to the

ground and easily contacts the vegetation to be cut without the operator having to bend over.

Each time the head is bumped, about 1 in (25.4 mm.) of trimming line is released. A blade in the cutting attachment shield will cut the line to the proper length if excess line is released. For best results, tap the Bump Head™ on bare ground or hard soil. If line release is attempted in tall grass, the engine may stall. Always keep the trimming line fully extended. Line release becomes more difficult as the cutting line becomes shorter.

NOTE: Do not rest the Bump Head™ on

the ground.

CAUTION: Do not remove or alter the line cutting blade assembly. Excessive line length will make the clutch overheat. This may lead to serious personal injury or damage to the unit.

Some line breakage will occur from:

• Entanglement with foreign matter

• Normal line fatigue

• Attempting to cut thick, stalky weeds

• Forcing the line into objects such as walls or

fence posts

OPERATING INSTRUCTIONS

ADJUSTING TRIMMING LINE LENGTH

The Bump Head™ cutting attachment allows you to release trimming line without stopping the engine. To release more line, lightly tap the cutting attachment on the ground (Fig. 25) while operating the trimmer at high speed.

NOTE: Always keep the trimming line fully

extended. Line release becomes more difficult as cutting line becomes shorter.

Fig. 25

Fig. 24

TIPS FOR BEST TRIMMING RESULTS

• Keep the cutting attachment parallel to the ground.

• Do not force the cutting attachment. Allow the tip of the line to do the cutting, especially along walls. Cutting with more than the tip will reduce cutting efficiency and may overload the engine.

• Cut grass over 8 in. (200 mm.) by working from top to bottom in small increments to avoid premature line wear or engine drag.

• Cut from left to right whenever possible. Cutting to the right improves the unit's cutting efficiency. Clippings are thrown away from the operator.

• Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side motion. Cutting shorter lengths produces the best results.

• Trim only when grass and weeds are dry.

• The life of your cutting line is dependent

upon;

• Following the previous trimming

techniques

• What vegetation is being cut

• Where it’s being cut

For example, the line will wear faster when trimming against a foundation wall as opposed to trimming around a tree.

DECORATIVE TRIMMING

Decorative trimming is accomplished by removing all vegetation around trees, posts, fences, etc.

Rotate the whole unit so that the cutting attachment is at a 30° angle to the ground (Fig. 26).

OPERATING INSTRUCTIONS

USING THE CUTTING BLADE

WARNING: Always wear eye,

hearing, foot, body protection and the strap to reduce the risk of injury when operating this unit.

Before operating the unit with the cutting blade stand in the operating position (Figs. 27). Refer to Holding the Trimmer, Pg. 18.

Fig. 26

Fig. 27

Cutting Blade Operating Tips:

To establish a rhythmic cutting procedure:

• Plant feet firmly, comfortably apart.

• Bring the engine to full throttle before

entering the material to be cut. The blade has maximum cutting power at full throttle and is less likely to bind, stall, or cause blade thrust, which can result in serious personal injury to the operator or others.

WARNING:

Blade thrust may occur

when the spinning blade contacts an object that it does not immediately cut. Blade thrust can be violent enough to cause the unit and/or operator to be propelled in any direction, and possibly lose control of the unit. 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.

• Cut while swinging the upper part of your body from right to left.

• Always release the throttle trigger and allow the engine to return to idle speed when not cutting.

WARNING: The blade continues to spin after the engine is turned off. The coasting blade can seriously cut you if accidentally touched.

• Swing the unit in the same direction as the blade spins, which increases the cutting action.

• Move forward to the next area to be cut after the return swing and plant feet again.

• The cutting blade is designed with a second cutting edge, which can be used by removing the blade, turning it upside down, and reinstalling it.

WARNING: Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury to yourself or others. Replace the blade.

OPERATING INSTRUCTIONS

MAINTENANCE AND REPAIR INSTRUCTIONS

NOTE: Some maintenance procedures may

require special tools or skills. If you are unsure about these procedures take your unit to an authorized service dealer.

MAINTENANCE SCHEDULE

These required maintenance procedures should be performed at the frequency stated in the table. They should also be included as part of any seasonal tune-up.

WARNING: Never do maintenance or repairs with unit running. Always do maintenance and repairs on a cool unit. Disconnect spark plug wire to ensure the unit will not start.

Fig. 28

To reduce the chance of material wrapping around the blade, follow these steps:

• Cut at full throttle.

• Swing the unit into material to be cut from

your right to your left (Fig. 28).

• Avoid the material just cut as you make the return swing.

WARNING: Do not clear away cut material with the engine running or blade turning. To avoid serious personal injury, turn off engine. Allow the blade to stop before removing materials wrapped around the blade shaft.

FREQUENCY MAINTENANCE REQUIRED REFER TO:

Before Starting Engine Fill fuel tank with correct oil and fuel mixture. Page 15

Every 10 Hours Clean and re-oil air filter. Page 24

Every 50 Hours Check spark plug condition and gap. Page 26

MAINTENANCE AND REPAIR INSTRUCTIONS

LINE INSTALLATION

Always use genuine Ryobi 0.095 in. (2.41 mm.) replacement line. Larger line may make the engine overheat or fail.

WARNING: Do not use metal reinforced line.

There are two methods to replace the trimming line.

• Wind the inner reel with new line

• Install a prewound inner reel

NOTE: Replacement line Part # 612454, or a

prewound reel, Part # 147345 can be purchased from you local authorized dealer.

Winding the Existing Inner Reel

1. Hold the outer spool with one hand and unscrew the Bump Knob™clockwise (Fig. 29). Inspect the bolt inside the Bump Knob™ to make sure it moves freely. Replace the Bump Knob™ if damaged.

NOTE: A Bump Knob™, Part # 180814 can

be purchased from you local authorized dealer.

4. Use a clean cloth to clean the the inner reel, spring, shaft, and inner surface of the outer spool (Fig. 30).

5. Check the indexing teeth on the inner reel and outer spool for wear (Fig. 31). If necessary, remove burrs or replace the reel and spool.

NOTE: A cutting attachment outer spool, Part

# 147494 can be purchased from your local authorized dealer.

Fig. 29

Fig. 30

Fig. 31

2. Remove the inner reel from the outer spool (Fig. 29).

3. Remove spring from the inner reel (Fig. 29).

NOTE: An inner reel spring, Part # 610636

can be purchased from you local authorized dealer.

Indexing Teeth

Inner Reel

Spring

Outer Spool

Bump Knob™

9. Place the spring in the inner reel. Insert the ends of the line through the eyelets in the outer spool and place inner reel inside the outer spool (Fig. 35). Push the inner reel and outer spool together. While holding the inner reel and outer spool, grasp the ends and pull firmly to release the line from the holding slots in the spool.

NOTE: The spring must be assembled on

the inner reel before reassembling the cutting attachment.

MAINTENANCE AND REPAIR INSTRUCTIONS

7. Wind the lines in tight even layers, onto the reel (Fig. 33). Wind the line in the direction indicated on the inner reel. Place your index finger between the two lines to stop the lines from overlapping. Do not overlap the ends of the line.

NOTE: Failure to wind the line in the direction

indicated will cause the cutting attachment to operate incorrectly.

8. Insert the ends of the line into the two holding slots (Fig. 34).

Fig. 33

Fig. 34

Fig. 35

Fig. 32

6. Take approximately 25 feet (7.6 m) of new trimming line, loop it into two equal lengths. Insert each end of the line through one of the two holes in the inner reel (Fig. 32). Pull the line through the inner reel so that the loop is as small as possible.

NOTE: Always use the correct line length

when installing trimming line on the unit. The line may not release properly if the line is too long.

10.Hold the inner reel in place and install the Bump Knob™ by turning counterclockwise. Tighten securely.

Holding Slots

MAINTENANCE AND REPAIR INSTRUCTIONS

Installing a Prewound Reel

1. Hold the outer spool with one hand and unscrew the Bump Knob™ counterclockwise (Fig. 29, Pg 21). Inspect the bolt inside the Bump Knob™ to make sure it moves freely. Replace the Bump Knob™ if damaged.

2. Remove the old inner reel from the outer spool (Fig. 29, Pg. 21.

3. Remove the spring from the old inner reel (Fig. 29, Pg. 21.

4. Place the spring in the new inner reel.

NOTE: The spring must be assembled on

the inner reel before reassembling the cutting attachment.

5. Insert the ends of the line through the eyelets in the outer spool (Fig. 35).

6. Place the new inner reel inside the outer spool. Push the inner reel and outer spool together. While holding the inner reel and outer spool, grasp the ends and pull firmly to release the line from the holding slots in the spool.

7. Hold the inner reel in place and install the Bump Knob™ by turning clockwise. Tighten securely.

AIR FILTER MAINTENANCE

Removing the Air Filter/Muffler Cover

WARNING: To avoid serious

personal injury, always turn your trimmer off and allow it to cool before you clean or do any maintenance on it.

1. Place the choke lever in the PARTIAL choke position (B).

NOTE: The choke lever must be in the

PARTIAL choke position (B) (Fig. 36)

to remove the air filter/muffler cover.

2. Remove the four (4) screws securing the air filter/muffler cover (Fig. 36). Use a flat blade or # T20 Torx bit screwdriver.

Choke Lever

Screws

Partial Choke Position (B)

Fig. 36

3. Pull the cover from the engine. Do not force.

MAINTENANCE AND REPAIR INSTRUCTIONS

6. Replace the air filter in the air filter/muffler cover (Fig. 37).

NOTE: Operating the unit without the air filter

and air filter/muffler cover assembly, will VOID the warranty.

Reinstalling the Air Filter/Muffler Cover

1. Place the air filter/muffler cover over the back of the carburetor and muffler.

NOTE: The choke lever must be in the

PARTIAL choke position (B)

(Fig. 36, Pg. 23) to install the air filter/muffler cover.

2. Insert the four (4) screws into the holes in the air filter/muffler cover (Fig. 36, Pg. 23) and tighten. Use a flat blade or # T20 Torx bit screwdriver. Do not over tighten. Do not force.

4. Apply enough clean SAE 30 oil to lightly coat the filter (Fig. 39).

5. Squeeze the filter to spread and remove excess oil (Fig. 40).

Air Filter

3. Wash the filter in detergent and water (Fig. 38). Rinse the filter thoroughly. Squeeze out excess water. Allow it to dry completely.

Cleaning the Air Filter

WARNING: To avoid serious

personal injury, always turn your trimmer off and allow it to cool before you clean or do any maintenance on it.

Clean and re-oil the air filter every 10 hours of operation. It is an important item to maintain. Not maintaining the air filter will VOID the warranty.

1. Remove the air filter/muffler cover. See Removing the Air filter/Muffler Cover, Pg. 23.

2. Remove the air filter from behind the air filter/muffler cover. (Fig. 37).

Fig. 37

Fig. 38

Fig. 39

Fig. 40

MAINTENANCE AND REPAIR INSTRUCTIONS

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable though the Air filter/muffler cover (Fig 41).

NOTE: Careless adjustments can seriously

damage your unit. An authorized service dealer should make carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason for the unit not running properly. Drain and refill the tank with fresh, properly mixed fuel prior to making any adjustments. Refer to

Oil and Fuel Information, Pg. 15.

Clean Air Filter

The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air flow and change the air/fuel mixture. This is often mistaken for an out of adjustment carburetor. Check the condition of the air filter before adjusting the idle speed screw. Refer to

Air Filter Maintenance Pg. 24.

Adjust Idle Speed Screw

WARNING: The cutting attachment

may be spinning during idle speed adjustment. Wear protective clothing and observe all safety instructions to prevent serious personal injury.

If after checking the fuel mixture and cleaning the air filter the engine still will not idle, adjust the idle speed screw as follows.

1. Start the engine and let it run at a high idle for a minute to warm up.

2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small phillips or flat blade screwdriver into the hole in the air filter/muffler cover (Fig. 41). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.

NOTE: The cutting attachment should not

rotate when the engine idles.

3. If the

cutting attachment rotates when the

engine idles,

turn the idle speed screw counterclockwise 1/8 of a turn at a time (as needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter, and adjusting the idle speed screw should solve most engine problems.

If not and:

• The engine will not idle,

• The engine hesitates or stalls on

acceleration,

• There is a loss of engine power, have the carburetor adjusted by an authorized

service dealer.

WARNING: When the unit is turned off make sure the cutting attachment has stopped before the unit is set down to prevent serious personal injury.

Fig. 41

Idle Speed Screw

MAINTENANCE AND REPAIR INSTRUCTIONS

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug (or equivalent). The correct air gap is 0.020 in. (0.5 mm.). Remove the plug after every 50 hours of operation and check its condition.

1. Stop the engine and allow it to cool. Grasp the plug wire firmly and pull the cap from the spark plug.

2. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.

3. Replace cracked, fouled or dirty spark plug. Set the air gap at 0.020 in. (0.5 mm.) using a feeler gauge (Fig. 42).

CAUTION: Do not sand blast, scrape, or clean electrodes. Grit in the engine could damage the cylinder.

4. Install a correctly gaped spark plug in the cylinder head. Tighten by turning the 5/8 in. socket clockwise until snug.

If using a torque wrench torque to; 110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.

ACCESSORIES/REPLACEMENT PAR TS

2-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . 147543

Spark Plug . . . . . . . . . . . . . . . . . . . . . . 610311

Replacement Line . . . . . . . . . . . . . . . . 612454

Replacement Line Cartridge . . . . . . . . . 147345

Inner Reel Spring . . . . . . . . . . . . . . . . . 610636

Bump Head Knob Assembly . . . . . . . . 180814

Outer Spool . . . . . . . . . . . . . . . . . . . . .147494

Cutting Attachment Head Assembly . . .147498

Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . 180000

Shoulder Harness . . . . . . . . . . . . . . . . 682075

Cutting Blade . . . . . . . . . . . . . . . . . . . . 145873

Blade Retaining Kit . . . . . . . . . . . . . . . .180014

0.020 in.

(0.5 mm.)

Fig. 42

CLEANING AND STORAGE

TRANSPORTING

• Allow the engine to cool before transporting.

• Secure the unit while transporting.

• Drain the fuel tank before transporting.

• Tighten fuel cap before transporting.

CLEANING

WARNING: To avoid serious

personal injury, always turn your trimmer off and allow it to cool before you clean or do any maintenance on it.

Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth.

STORAGE

• Never store the unit with fuel in the tank where fumes may reach an open flame or spark.

• Allow the engine to cool before storing.

• Store the unit locked up to prevent

unauthorized use or damage.

• Store the unit in a dry, well ventilated area.

• Store the unit out of the reach of children.

LONG TERM STORAGE

If the unit will be stored for an extended time, use the following storage procedure.

1. Drain all fuel from the fuel tank and drain into a container with the same 2-cycle fuel mixture. Do not use fuel that has been stored for more than 60 days. Dispose of the old fuel/oil mix in accordance to Federal, State, and Local regulations.

2. Start the engine and allow it to run until it stalls. This ensures that all fuel has been drained from the carburetor.

3. Allow the engine to cool. Remove the spark plug and put 1 oz. (30 ml.) of any high quality motor oil or 2-cycle oil into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all

of the oil from the cylinder before attempting to start the trimmer after storage.

4. Thoroughly clean the unit and inspect for any loose or damaged parts. Repair or replace damaged parts and tighten loose screws, nuts or bolts. The unit is ready for storage.

TROUBLESHOOTING

Engine will not start

Engine will not idle

Low idle speed

Engine will not accelerate

Engine lacks power or stalls when cutting

Cutting head will not advance line

Ignition switch is OFF

Empty fuel tank

Primer bulb wasn't pressed enough

Engine flooded

Old or Improperly Mixed Fuel

Fouled spark plug

Air Filter is Plugged

Old or Improperly Mixed Fuel

Improper carburetor adjustment

Old or Improperly Mixed Fuel

Improper carburetor adjustment

Cutting head bound with grass

Dirty air filter

Old or Improperly Mixed Fuel

Improper carburetor adjustment

Cutting head bound with grass

Cutting head out of line

Inner reel bound up

Cutting head dirty

Line welded

Line twisted when refilled

Not enough line is exposed

Turn switch to ON

Fill fuel tank

Press primer bulb fully and slowly 5-7 times

Use starting procedure with choke lever in the RUN position Pg. 16

Drain fuel tank / Add fresh fuel mixture

Replace or clean the spark plug

Replace or clean the air filter

Drain fuel tank / Add fresh fuel mixture

Adjust per instruction Pg. 25

Drain fuel tank / Add fresh fuel mixture

Take to an authorized service dealer for carburetor adjustment

Stop the engine and clean the cutting attachment

Clean or replace the air filter

Drain fuel tank / Add fresh fuel mixture

Take to an authorized service dealer for carburetor adjustment

Stop the engine and clean cutting attachment

Refill with new line

Replace the inner reel

Clean inner reel and outer spool

Disassemble, remove the welded section and rewind the line

Disassemble and rewind the line

Push the Bump Knob and pull out line until 4 in. (102 mm.) of line is outside of the cutting attachment

PROBLEM CAUSE ACTION

SPECIFICATIONS

ENGINE

Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle

Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 in. (31.75 mm.)

Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 cu. in. (31 cc.)

Clutch Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrifugal

Operating RPM (Trimmer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6100-7300 rpm

Operating RPM (Cutting Blade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8500-9500 rpm

Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2800-3900 rpm

Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic

Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slide Switch

Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.020 in. (0.5 mm.)

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture

Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32:1

Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position

Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto Rewind

Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard

Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return

Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 oz. (530 ml.)

Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HD Polyethylene

DRIVE SHAFT & CUTTING ATTACHMENT

Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube

Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger

Unit Weight (No fuel, with cutting attachment, cutting attachment shield and J handle) 14 lbs. (6.4 kg.)

Cutting Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 4-Tooth Cutting Blade, Dual String Cutting Head

Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 in. (101.6 mm.)

Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.095 in. (2.41 mm.)

Cutting Path Diameter, Cutting Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 in. (45.7 cm.)

Cutting Path Diameter, Cutting Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Inches (204 mm.)

Shoulder Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Quick-Snap

NOTES

The California Air Resources Board and Ryobi Outdoor Products (ROP), are pleased to explain the emission control system warranty on your 1995 and later small off-road engine. In California, new small off-road engines must be designed, built and equipped to meet the State's stringent anti-smog standards. ROP must warrant the emission control system on your small off-road engine for the periods of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-road engine.

Your emission control system may include parts such as the carburetor or fuel injection system, the ignition system, and catalytic converter. Also included may be hoses, belts, connectors and other emission-related assemblies.

Where a warrantable condition exists, ROP will repair your small off-road engine at no cost to you including diagnosis, parts and labor.

The 1995 and later small off-road engines are warranted for two years. If any emission-related part on your engine is defective, the part will be repaired or replaced by ROP.

OWNER'S WARRANTY RESPONSIBILITIES:

• As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your operator's manual. ROP recommends that you retain all receipts covering maintenance on your small off-road engine, but ROP cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.

• As the small off-road engine owner, you should however be aware that ROP may deny you warranty coverage if your small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.

• You are responsible for presenting your small off-road engine to a Ryobi Authorized Service Center as soon as a problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.

If you have any questions regarding your warranty rights and responsibilities, you should call 1-800-345-8746.

MANUFACTURER'S WARRANTY COVERAGE:

•

The warranty period begins on the date the engine or equipment is delivered to the retail purchaser.

•

The manufacturer warrants to the initial owner and each subsequent purchaser, that the engine is free from defects in material and workmanship which cause the failure of a warranted part for a period of two years.

•

Repair or replacement of warranted part will be performed at no charge to the owner at an Authorized Ryobi Service Center. For the nearest location, please contact Ryobi at: 1-800-345-8746.

•

Any warranted part which is not scheduled for replacement, as required maintenance which is scheduled only for regular inspection to the effect of "Repair or replace as necessary" is warranted for the warranty period. Any warranted part which is scheduled for replacement as required maintenance will be warranted for the period of time up to the first scheduled replacement point for that part.

•

The owner will not be charged for diagnostic labor which leads to the determination that a warranted part is defective, if the diagnostic work is performed at an Authorized Ryobi Service Center.

•

The manufacturer is liable for damages to other engine components caused by the failure of a warranted part still under warranty.

•

Failures caused by abuse, neglect or improper maintenance are not covered under warranty.

•

The use of add-on or modified parts can be grounds for disallowing a warranty claim. The manufacturer is not liable to cover failures or warranted parts caused by the use of add-on or modified parts.

•

In order to file a claim, go to your nearest Authorized Ryobi Service Center. Warranty services or repairs will be provided at all Authorized Ryobi Service Centers.

•

Any manufacturer approved replacement part may be used in the performance of any warranty maintenance or repair of emission related parts and will be provided without charge to the owner. Any replacement part that is equivalent in performance or durability may be used in non-warranty maintenance or repair and will not reduce the warranty obligations of the manufacturer.

•

The following components are included in the emission related warranty of the engine, air filter, carburetor, primer, fuel lines, fuel pick up/fuel filter, ignition module, spark plug and muffler.

CALIFORNIA EMISSION CONTROL WARRANTY STATEMENT

YOUR WARRANTY RIGHTS AND OBLIGATIONS

RYOBI OUTDOOR PRODUCTS warrants each new RYOBI Product for two (2) years according to the following terms.

This warranty extends to the original retail purchaser only and commences on the date of original retail purchase.

Any part of the RYOBI Product manufactured or supplied by RYOBI and found in the reasonable judgement of RYOBI to be defective in material or workmanship will be repaired or replaced by an authorized RYOBI service dealer without charge for parts and labor.

The RYOBI Product including any defective part must be returned to an authorized service dealer within the warranty period. The expense of delivering the RYOBI Product to the dealer for warranty work and the expense of returning it back to the owner after repair or replacement will be paid for by the owner. RYOBI’s responsibility in respect to claims is limited to making the required repairs or replacements and no claim of breach of warranty shall be cause for cancellation or rescission of the contract of sale of any RYOBI Product. Proof of purchase will be required by the dealer to substantiate any warranty claim. All warranty work must be performed by an authorized RYOBI service dealer.

This warranty is limited to ninety (90) days from the date of original retail purchase for any RYOBI Product that is used for rental or commercial purposes, or any other income-producing purpose.

This warranty does not cover any RYOBI Product that has been subject to misuse, neglect, negligence, or accident, or that has been operated in any way contrary to the operating instructions as specified in the RYOBI Operator’s Manual. This warranty does not apply to any damage to the RYOBI Product that is the result of improper maintenance or to any RYOBI Product that has been altered or modified so as to adversely affect the product's operation, performance or durability or that has been altered or modified so as to change its intended use. The warranty does not extend to repairs made necessary by normal wear or by the use of parts or accessories which are either incompatible with the RYOBI Product or adversely affect its operation, performance or durability.

In addition, this warranty does not cover: A. Tune-ups - Spark Plugs, Carburetor

Adjustments, Filters

B. Wear items - Bump Knobs, Outer Spools,

Cutting Line, Inner Reels, Starter Pulley, Starter Ropes, Drive Belts

RYOBI reserves the right to change or improve the design of any RYOBI Product without assuming any obligation to modify any product previously manufactured.

ALL IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE TWO (2) YEAR WARRANTY PERIOD OR NINETY (90) DAYS FOR PRODUCTS USED FOR ANY COMMERCIAL PURPOSE. ACCORDINGLY, ANY SUCH IMPLIED WARRANTIES INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR OTHERWISE, ARE DISCLAIMED IN THEIR ENTIRETY AFTER THE EXPIRATION OF THE APPROPRIATE TWO-YEAR OR NINETY DAY WARRANTY PERIOD. RYOBI’S OBLIGATION UNDER THIS WARRANTY, IS STRICTLY AND EXCLUSIVELY LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE PARTS, AND ROP DOES NOT ASSUME OR AUTHORIZE ANYONE TO ASSUME FOR THEM ANY OTHER OBLIGATION. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

RYOBI ASSUMES NO RESPONSIBILITY FOR INCIDENTAL, CONSEQUENTIAL OR OTHER DAMAGES INCLUDING, BUT NOT LIMITED TO EXPENSE OF RETURNING THE RYOBI PRODUCT TO AN AUTHORIZED SERVICE DEALER AND EXPENSE OF DELIVERING IT BACK TO THE OWNER, MECHANIC’S TRAVEL TIME, TELEPHONE OR TELEGRAM CHARGES, RENTAL OF A LIKE PRODUCT DURING THE TIME WARRANTY SERVICE IS BEING PERFORMED, TRAVEL, LOSS OR DAMAGE TO PERSONAL PROPERTY, LOSS OF REVENUE, LOSS OF USE OF THE PRODUCT, LOSS OF TIME, OR INCONVENIENCE. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

This warranty applies to all RYOBI Products manufactured by RYOBI and sold in the United States and Canada.

To locate your nearest service dealer dial 1-800-345-8746 in the United States or 1-800-265-6778 in Canada.

RYOBI OUTDOOR PRODUCTS

550 N. 54th Street

Chandler, AZ 85226 U.S.A.

RYOBI CANADA INC.

275 Industrial Rd

Cambridge, Ontario N1R 6K2 CANADA

LIMITED TWO-YEAR WARRANTY

SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.

FOR QUESTIONS CALL 1-800-345-8746 IN U.S.

OR 1-800-265-6778 IN CANADA

OPERATOR’S MANUAL PART NO. 182091 REV. A (7714) PRINTED IN U.S.A. 9/98

Ryobi 790r User guide

Specifications and Main Features

Frequently Asked Questions

User Manual