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6

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. 

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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