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Ryobi 990r - page 1
1 MODEL NO. 990r IMPOR T ANT MANU AL DO NO T THR O W A W A Y 990r OPERA T OR’S MANU AL ...
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Ryobi 990r - page 2
2 I. California Emission Regulations ................................3 II. Safety W ar nings ......................................................3-6 A. Safety W ar nings for Brush Blade ..........................4 B. Safety and International Symbols ......................5-6 III. Assembly Instructions ..........................................7-1 ...
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Ryobi 990r - page 3
3 CALIFORNIA EMISSION REGULA TIONS The engine of your lawn and garden car e product meets the 1995 California emissions regulations. T o ensur e that your unit continues to meet these regulations, r efer to the following information and instructions in this operator's manual. These units are identified by the label on the engine of your produc ...
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Ryobi 990r - page 4
4 SAFETY W ARNINGS OPERA TION AL • W ear safety glasses/goggles at all times when operating this trimmer . • Dress pr operly . Do not operate this trimmer when barefoot or wearing open sandals. Always wear stur dy , rubber -soled footwear . The use of gloves, ear/hearing protection and long pants ar e recommended. • Do not wear loose fitting ...
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Ryobi 990r - page 5
5 SAFETY W ARNINGS (Continued) • SAFETY ALERT SYMBOL. Indicates caution, warning or danger . May be used in conjunction with other symbols or pic- tographs. • READ OPERA TOR'S MANUAL. Failure to follow operating instructions and safe- ty precautions in operator's manual can r esult in serious injury . Read operator's manual befor ...
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Ryobi 990r - page 6
6 SIGNIFICA TION SYMBOL SAFETY W ARNINGS (Continued) • PRIMER BULB. Push primer bulb, fully and slowly , 5 to 7 times. • CHOKE CONTROL. FULL CHOKE position. • CHOKE CONTROL. P ARTIAL CHOKE position. • CHOKE CONTROL. RUN position. • THROWN OBJECTS AND ROT A TING CUTTER CAN CAUSE SEVERE INJUR Y . W arning. Do not operate without guard in pl ...
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Ryobi 990r - page 7
7 ASSEMBL Y INSTR UCTIONS The J-handle is shipped completely assembled on Model 990r (Fig. 1). Use the following instructions to adjust the J-handle to the correct operating position. 1. Loosen the four (4) mounting screws on the J-handle. It is not necessary to remove the scr ews. 2. Slide the J-handle through the clamp until the arrow / white lin ...
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Ryobi 990r - page 8
8 INST ALLING THE BR USH BLADE 1. Remove the line guard. 2. Insert the locking rod into the locking rod slot. Rotate the line spool clockwise . Remove the line spool and retainer washer fr om the shaft (Fig. 6). 3. Make sure that you have all of the parts necessary to install the brush blade (Fig. 7). Do not remove the blade tooth cover off of the ...
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Ryobi 990r - page 9
W ARNING Make 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 by vibration, and the blade may fly off. Failur e to obey this warning may cause injury to yourself or others. 9 6. When assembling the brush blade, the blade edge should line up with the blade locating m ...
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Ryobi 990r - page 10
10 OPERA TING THE SPLIT BOOM ® COUPLER Model 990r is equipped with a Split Boom ® coupler , which enables optional attachments to be installed on this unit. The optional attachments are: Sweeper/Blower ......................................................SB720r V acuum ......................................................................L V720r ...
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Ryobi 990r - page 11
11 OIL & FUEL INFORMA TION 4. Reinstall oil fill plug / dipstick into the crankcase. NOTE: Save the bottle and funnel spout for future use. CHECKING THE OIL The importance of checking and maintaining the proper oil level in the crankcase cannot be overemphasized. Check the oil BEFORE EACH USE as follows: 1. Make sure the engine is stopped, leve ...
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Ryobi 990r - page 12
12 RECOMMENDED FUEL TYPE W ARNING Fuel is extremely flammable and its vapors can explode if they are ignited. 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 away from the ar ea. Fill the fuel tank, using clean, fresh, unleaded gasoline. NOTE: Alcohol blended ...
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Ryobi 990r - page 13
13 1. CHECK THE OIL LEVEL IN THE CRANKCASE, AND PUT THE IGNITION SWITCH IN THE "RUN" (I) POSITION. See Figure 20 for the location of the ignition switch . 2. FULL Y PRESS AND RELEASE THE PRIMER BULB 5 TO 7 TIMES. See Fig. 21 for the primer bulb location. 3. PLACE THE CHOKE LEVER IN THE FULL “ CHOKE ” POSITION. See Fig. 21. N OTE: For ...
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Ryobi 990r - page 14
1. Always maintain the proper stance when using the brush blade (Fig. 25). Sharpening the Brush Blade W ARNING Do not sharpen the brush blade. Sharpening the blade can cause the blade tip to break of f while in use. This can result in sever e personal injury to yourself or others. The brush blade is designed with a second set of teeth, which can be ...
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Ryobi 990r - page 15
15 FREQUENCY MAINTENANCE REQUIRED REFER TO: Daily or Before Starting Engine Every 10 Hours Change oil after initial use. Clean and re-oil air filter . Page 11 Page 18 Every 25 Hours Change oil. Pages 10-11 MAINTEN ANCE SCHEDULE These requir ed maintenance procedur es should be performed at the frequency stated in the table. They should also be incl ...
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Ryobi 990r - page 16
16 Bump Knob MAINTEN ANCE AND REP AIR INSTR UCTIONS (Continued) LINE INST ALLA TION The trimming line may be replaced by two dif ferent meth- ods - rewinding the existing r eel or installing a prewound reel. REWINDING THE EXISTING REEL T o rewind the existing r eel you must: 1. Check for the correct line size. 2. Remove the existing reel and spring ...
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Ryobi 990r - page 17
17 Reinstalling the Reel 1. Insert the ends of the line through the eyelets in the outer spool (Fig. 33). Place the inner reel into the outer spool. Grasp the ends and pull firmly to release the line from the holding slots in the spool. NOTE: The spring must be in the center of the outer spool. 2. Install the bump knob and tighten counterclockwise ...
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Ryobi 990r - page 18
18 MAINTEN ANCE AND REP AIR INSTR UCTIONS (Continued) GEAR HOUSING SER VICE W ARNING The gear housing gets very warm after long peri- ods of use. Do not touch the housing until it has cooled. 1. Check the gear housing for lubricant every 50 hours of operation. 2. T o check the lubricant level, remove the fill plug (Fig. 34). The lubricant should be ...
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Ryobi 990r - page 19
19 NOTE: CLEAN AND RE-OIL THE AIR FIL TER EVER Y 10 HOURS OF OPERA TION . Y our unit ’ s air filter is one of the most important areas to maintain. If it is not maintained, you will void the warranty . Before cleaning, make sur e the unit is turned off. 1. Remove the three (3) screws on the carbur etor/air filter cover assembly . Remove the air f ...
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Ryobi 990r - page 20
20 MAINTEN ANCE AND REP AIR INSTR UCTIONS (Continued) 4. Start the engine and let it run for three (3) to five (5) minutes with the throttle trigger fully squeezed. 5. Release the throttle trigger and let the engine idle. If the engine stops, turn the idle speed screw (Fig. 40) n (clockwise) 1/8 turn at a time (as required) until the engine idles. ...
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Ryobi 990r - page 21
21 MAINTEN ANCE AND REP AIR INSTR UCTIONS (Continued) Rich Lean Adjust to Midpoint NOTE: If the carburetor adjustments do not help the unit to run properly , contact your authorized service dealer . NOTE: If the limiter caps are r emoved at any time, your unit will no longer meet the1995 California emission regulations and you will void the warrant ...
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Ryobi 990r - page 22
22 Inspection and Cleaning Inspect the inlet port of the muffler and outlet port of the cylinder for excessive carbon build-up. Excessive deposits around the exhaust ports or exhaust holes will cause poor engine performance. If carbon build-up cannot be cleaned, replace the muf fler . Inspect the muffler mounting holes for elongation. Replace the m ...
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Ryobi 990r - page 23
23 MAINTEN ANCE AND REP AIR INSTR UCTIONS (Continued) CHECKING / ADJUSTING V AL VE TO R OCKER ARM CLEARANCE Every 50 hours of operation , remove the r ocker arm cover and check the valve to rocker arm clearance, using a flat feeler gauge . NOTE: The engine must be cold when checking or adjusting the clearance. Check / adjust the clearance as follow ...
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Ryobi 990r - page 24
24 MAINTEN ANCE AND REP AIR INSTR UCTIONS (Continued) 3. Remove the rocker arm cover and gasket, using a T - 25 T orx ® screwdriver (Fig. 50). Fig. 50 Flat Feeler Gauge Va l v e Rocker Arm Fig. 51 4. Position the crankshaft so the piston is at the top of the compression str oke (the rocker arms are fr ee and loose). 5. Measure the clearance betwee ...
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Ryobi 990r - page 25
25 CLEANING AND ST ORA GE 3. Drain the oil from the crankcase and add fresh oil. Pull the starter rope a few times to lubricate the engine. 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 now ready for storage. 5. Store the trimmer in a dry ...
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Ryobi 990r - page 26
26 TR OUBLESHOO TING PR OBLEM CA USE A CTION Engine Is Difficult to Ignition switch is “ STOP (O)" T ur n switch to “ RUN (I) ” Start or Will Not Start Primer bulb wasn ’ t pushed enough Press primer bulb fully and slowly 5-7 times Engine is not choked Use starting procedur e, USING "FULL" CHOKE" (Page 9) Empty fuel tank ...
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Ryobi 990r - page 27
27 CALIFORNIA EMISSION CONTR OL W ARRANTY ST A TEMENT Y OUR W ARRANTY RIGHTS AND OBLIGA TIONS The California Air Resources Board and Ryobi Outdoor Products (ROP), ar e pleased to explain the emission control system warranty on your 1995 and later lawn and garden equipment engine. In California, new lawn and garden equipment engines must be designed ...
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Ryobi 990r - page 28
28 Limited T wo-Y ear W arranty RYOBI AMERICA CORP . warrants each new RYOBI Product for two (2) years accor d- ing 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 Pr oduct manufactured or supplied by RYOBI and found in the reasonable ju ...
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