Ryobi SB720R Operator's Manual

1MODEL NO. 990rIMPORTANT MANUAL DO NOT THROW AWAY990rOPERATOR’SMANUAL

10OPERATING THE SPLIT BOOM®COUPLER Model 990r is equipped with a Split Boom®coupler,which enables optional attachments to be installed on thisunit. T

11OIL & FUEL INFORMATION4. Reinstall oil fill plug / dipstick into the crankcase.NOTE: Save the bottle and funnel spout forfuture use.CHECKING THE

12RECOMMENDED FUEL TYPEWARNINGFuel is extremely flammable and its vapors canexplode if they are ignited. Always stop theengine and allow it to cool be

131. CHECK THE OIL LEVEL IN THECRANKCASE, AND PUT THE IGNITIONSWITCH IN THE "RUN" (I) POSITION. SeeFigure 20 for the location of the ignit

1. Always maintain the proper stance when using thebrush blade (Fig. 25). Sharpening the Brush BladeWARNINGDo not sharpen the brush blade. Sharpening

15FREQUENCY MAINTENANCE REQUIRED REFER TO:Daily or Before Starting EngineEvery10 HoursChange oil after initial use.Clean and re-oil air filter.Page 11

16Bump KnobMAINTENANCE AND REPAIR INSTRUCTIONS (Continued)LINE INSTALLATION The trimming line may be replaced by two different meth-ods - rewinding th

17Reinstalling the Reel1. Insert the ends of the line through the eyelets in theouter spool (Fig. 33). Place the inner reel into the outerspool. Grasp

18MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)GEAR HOUSING SERVICEWARNINGThe gear housing gets very warm after long peri-ods of use. Do not touch t

19NOTE: CLEAN AND RE-OIL THE AIR FILTEREVERY 10 HOURS OF OPERATION.Your unit’s air filter is one of the mostimportant areas to maintain. If it is notm

2I. California Emission Regulations ...3II. Safety Warnings ...3-6A. S

20MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)4. Start the engine and let it run for three (3) to five (5)minutes with the throttle trigger fully s

21MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)RichLeanAdjust toMidpointNOTE: If the carburetor adjustments do not helpthe unit to run properly, con

22Inspection and CleaningInspect the inlet port of the muffler and outlet port of thecylinder for excessive carbon build-up. Excessive depositsaround

23MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)CHECKING / ADJUSTING VALVE TOROCKER ARM CLEARANCEEvery 50 hours of operation, remove the rocker armco

24MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)3. Remove the rocker arm cover and gasket, using a T-25 Torx® screwdriver (Fig. 50).Fig. 50Flat Feele

25CLEANING AND STORAGE3. Drain the oil from the crankcase and add fresh oil. Pullthe starter rope a few times to lubricate the engine.4. Thoroughly cl

26TROUBLESHOOTINGPROBLEM CAUSE ACTIONEngine Is Difficult to Ignition switch is “STOP (O)" Turn switch to “RUN (I)”Start or Will Not StartPrimer

27CALIFORNIA EMISSION CONTROL WARRANTY STATEMENTYOUR WARRANTY RIGHTS AND OBLIGATIONSThe California Air Resources Board and Ryobi Outdoor Products (ROP

28Limited Two-Year WarrantyRYOBI AMERICA CORP. warrants each new RYOBI Product for two (2) years accord-ing to the following terms.This warranty exten

3CALIFORNIA EMISSION REGULATIONSThe engine of your lawn and garden care productmeets the 1995 California emissions regulations. To ensure that your un

4SAFETY WARNINGSOPERATIONAL• Wear safety glasses/goggles at all times when operating this trimmer.• Dress properly. Do not operate this trimmer when b

5SAFETY WARNINGS (Continued)• SAFETY ALERT SYMBOL.Indicates caution, warning or danger. May beused in conjunction with other symbols or pic-tographs.•

6SIGNIFICATIONSYMBOLSAFETY WARNINGS (Continued)• PRIMER BULB.Push primer bulb, fully and slowly, 5 to 7 times. • CHOKE CONTROL.FULL CHOKE position.• C

7ASSEMBLY INSTRUCTIONSThe J-handle is shipped completely assembled on Model990r (Fig. 1). Use the following instructions to adjust the J-handle to the

8INSTALLING THE BRUSH BLADE 1. Remove the line guard.2. Insert the locking rod into the locking rod slot. Rotatethe line spool clockwise. Remove the l

WARNINGMake sure the blade is flat against the washer after the lock nut is tightened. If the blade is off-center, the trimmer will be damaged byvibra