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RULES FOR SAFE OPERATION

5

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.

Summary of Contents for 780r

Page 1: ...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...

Page 2: ...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 2 TABLE OF CONTENTS I California Emission Regulations 3 II Rules for Safe...

Page 3: ...ory 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...

Page 4: ...utting 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 th...

Page 5: ...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 whene...

Page 6: ...t 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...

Page 7: ...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...

Page 8: ...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...

Page 9: ...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 Powe...

Page 10: ...d 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 screwdr...

Page 11: ...ld 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...

Page 12: ...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 resul...

Page 13: ...t 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 fut...

Page 14: ...E 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 bla...

Page 15: ...oose 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 t...

Page 16: ...on 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...

Page 17: ...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 T...

Page 18: ...und 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 NO...

Page 19: ...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 19...

Page 20: ...ols 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 st...

Page 21: ...lt 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 th...

Page 22: ...er 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 in...

Page 23: ...he 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 plac...

Page 24: ...o 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...

Page 25: ...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 a...

Page 26: ...e 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...

Page 27: ...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 a...

Page 28: ...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...

Page 29: ...tarter 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 Thro...

Page 30: ...NOTES 30...

Page 31: ...he 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 workmanshi...

Page 32: ...tion 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 res...

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