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780r–790r
2-Cycle Gas Trimmer/Brushcutter
OPERATOR’S MANUAL
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
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INTRODUCTION TABLE OF CONTENTS I. California Emission Regulations . . . . . . . . 3 THANK YOU II. Rules for Safe Operation . . . . . . . . . . . 4-9 Thank you for buying this quality product. This A. Important Safety Information . . . . . . .4-6 modern outdoor power tool will provide many B. Safety and International Symbols . . .7-8 hours of useful service. You will find it to be a C. Know Your Unit . . . . . . . . . . . . . . . . . .9 great labor-saving device. This operator’s manual provides
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CALIFORNIA EMISSION REGULATIONS 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. California Proposition 65 Warning: WARNING THE ENGINE EXHAUST FROM THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE OF
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RULES FOR SAFE OPERATION The purpose of safety symbols is to attract your DANGER: Failure to obey a safety attention to possible dangers. The safety warning will result in serious injury symbols, and their explanations, deserve your Always to yourself or to others. careful attention and understanding. The safety follow the safety precautions to warnings do not by themselves eliminate any reduce the risk of fire, electric danger. The instructions or warnings they give shock, and personal injury.
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RULES FOR SAFE OPERATION • Always stop the engine and allow it to cool • Use the right tool. Only use this tool for the before filling the fuel tank. Never remove the purpose intended. cap of the fuel tank, or add fuel, when the • Do not overreach. Always keep proper engine is hot. Never operate the unit without footing and balance. the fuel cap securely in place. Loosen the • Always hold the unit with both hands when fuel tank cap slowly to relieve any pressure in operating. Keep a firm grip on
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RULES FOR SAFE OPERATION WHILE OPERATING WITH CUTTING AFTER USE BLADE • Clean cutting blades with a household • Read and understand all safety warnings cleaner to remove any gum buildup. Oil the before operating this unit. blade with machine oil to prevent rust. • Always use the shoulder harness when using • Lock up and store the cutting blade in an the brush blade accessory. appropriate area to protect the blade from unauthorized use or damage. • Keep the handle between the operator and cuttin
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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. SYMBOL MEANING • SAFETY ALERT SYMBOL Indicates danger, warning, or caution. May be used in conjunction with other symbols or pictographs. • WARNING - READ OPERATOR'S MANUAL Failure to follow operating instructions and
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RULES FOR SAFE OPERATION SYMBOL MEANING • 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. • BRUSHCUTTERS Replace d
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RULES FOR SAFE OPERATION KNOW YOUR UNIT Fuel Cap APPLICATIONS As a trimmer; On/Off Stop Control • Cutting grass and light weeds. • Edging Starter Rope • Decorative trimming around trees, fences, etc. As a brushcutter; • Cutting weeds and light bush of up to 1/2 inch in diameter. Shaft Grip Other accessories may be used with the 790r. See list of add-ons on page 17. Spark Plug Support Fitting Throttle J-handle Control Handle Hardware Click-Link Choke Lever (790r only) Cutting Blade with Cover
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ASSEMBLY INSTRUCTIONS 6. While holding the unit in the operating INSTALLING AND ADJUSTING THE position (Fig. 3), position the J-handle to the J-HANDLE location that provides you the best grip. 1. Place the J-handle between the top and middle clamp pieces (Fig. 1). J-Handle (4) Screws Top Clamp Middle Clamp Bottom Clamp Nuts Fig. 1 Fig. 3 2. While holding the three pieces together, 7. Tighten the clamp screws evenly, until the install the four (4) screws through the top J-handle is secure. cla
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ASSEMBLY INSTRUCTIONS INSTALLING THE HARNESS REMOVING AND INSTALLING CUTTING ATTACHMENT SHIELD WARNING: Always use the shoulder harness when using the cutting Remove the cutting attachment shield blade to avoid serious personal when using the unit as a brushcutter. injury. WARNING: The cutting attachment 1. Push the strap through the center of the shield should NOT be installed when buckle. operating the unit with a blade. 2. Pull the strap over the cross bar and down Remove the cutting attachm
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ASSEMBLY INSTRUCTIONS REMOVING THE CUTTING Cutting Attachment 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 Locking Rod Shield See Removing and Installing Cutting Locking Rod Slot Attachment Shield, Pg. 11. Fig. 9 Remove the Cutting Attachment Install the Cutting Blade WARNING: The gear housing gets WARNING: To avoid serious hot with u
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ASSEMBLY INSTRUCTIONS 5. Make sure that the cutting blade is centered • If using a torque wrench and an 5/8 inch on the pilot step and sitting flat against the socket tighten to; output shaft bushing (Fig. 12). 325 - 335 in•lb, 27 - 28 ft.•lb, WARNING: If the cutting blade is off-center, the unit will vibrate, and 37 -38 N•m. the blade may fly off, which can • Without a torque wrench, use a 5/8 inch cause serious personal injury. closed-end or socket wrench, turning the nut until the blade reta
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ASSEMBLY INSTRUCTIONS 4. Remove the nut, blade retainer, and blade. REMOVE THE CUTTING BLADE AND Store the nut and blade together for future INSTALL THE CUTTING ATTACHMENT use in a secure place. Store out of reach of children. Remove the Cutting Blade Install the Cutting Attachment WARNING: To avoid serious personal injury, always wear gloves 5. Align the shaft bushing hole with the locking while handling or installing the blade. rod slot and insert the locking rod into the shaft bushing hole. (
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OIL AND FUEL INFORMATION Thoroughly mix the proper OIL AND FUEL MIXING ratio of 2-cycle engine oil with INSTRUCTIONS unleaded gasoline in a separate Old and/or improperly mixed fuel are the fuel can. Use a 32:1 fuel/oil ratio. Do not mix main reasons for the unit not running them directly in the engine fuel tank. See the properly. Be sure to use fresh, clean table below for specific gas and oil mixing unleaded fuel. Follow the instructions carefully ratios. for the proper fuel/oil mixture. NOTE
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STARTING/STOPPING INSTRUCTIONS 5. With the unit on the ground, squeeze the STARTING INSTRUCTIONS throttle control and hold. Pull starter rope WARNING: Avoid accidental briskly (Fig. 20). Continue pulling until the starting. Be in the starting position engine sounds as though it wants to run when pulling the starter rope (normally 2 to 5 pulls). (Fig. 20). The operator and unit must NOTE: Squeeze the throttle control until the be in a stable position while starting engine has started and warmed u
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OPERATING INSTRUCTIONS ® 2. While firmly holding the add-on, push it OPERATING THE CLICK-LINK ® straight into the Click-Link coupler (Fig. 22). SYSTEM - MODEL 790r ® NOTE: Aligning the release button with the The model 790r Click-Link system enables the guide recess will help installation use of these optional add-ons. (Fig. 21). Blower/Vacuum . . . . . . . . . . . . . . . . . . BV720r Cultivator . . . . . . . . . . . . . . . . . . . . . . . GC720r ® Edger . . . . . . . . . . . . . . . . . . .
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OPERATING INSTRUCTIONS HOLDING THE TRIMMER ADJUSTING TRIMMING LINE LENGTH The Bump Head™ cutting attachment allows WARNING: Always wear eye, you to release trimming line without stopping hearing, foot and body protection the engine. To release more line, lightly tap the to reduce the risk of injury when cutting attachment on the ground (Fig. 25) operating this unit. while operating the trimmer at high speed. Before operating the unit, stand in the operating NOTE: Always keep the trimming line
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OPERATING INSTRUCTIONS TIPS FOR BEST TRIMMING RESULTS USING THE CUTTING BLADE • Keep the cutting attachment parallel to the WARNING: Always wear eye, ground. hearing, foot, body protection and • Do not force the cutting attachment. Allow the strap to reduce the risk of injury the tip of the line to do the cutting, especially when operating this unit. along walls. Cutting with more than the tip will reduce cutting efficiency and may Before operating the unit with the cutting blade overload the en
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OPERATING INSTRUCTIONS • Cut while swinging the upper part of your To reduce the chance of material wrapping body from right to left. around the blade, follow these steps: • Always release the throttle trigger and allow • Cut at full throttle. the engine to return to idle speed when not • Swing the unit into material to be cut from cutting. your right to your left (Fig. 28). WARNING: The blade continues to • Avoid the material just cut as you make the spin after the engine is turned off. retur
