Ryobi 990r manual Cleaning And Storage, Specifications, Engine, Drive Shaft & Cutting Head

CLEANING AND STORAGE

WARNING

Always turn off your trimmer before you clean or perform any maintenance on it.

Cleaning

Use a small brush to clean off the outside of the trimmer. Do not use strong detergents on plastic housing or handle. They can be damaged by household cleaners that contain aromatic oils such as pine and lemon, and by solvents such as kerosene. Wipe off any moisture with a soft cloth.

Storage

If the trimmer will be stored for an extended period of time, use the following storage procedure.

1.Drain all fuel from the fuel tank. Do not use fuel that has been stored for more than 60 days.

2.Start the engine and allow it to run until it stalls. This ensures that all fuel has been drained from the carbu- retor.

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, well-ventilated area, and hang with the cutting head up or place the unit flat on the floor (Fig. 53).

Fig. 53

SPECIFICATIONS

ENGINE

Engine Type	Air-Cooled, 4-Cycle
Displacement	26.2 cc
Bore	32 mm (1.30 in)
Stroke	32.6 mm (1.3 in)
Clutch Type	Centrifugal
Operating RPM	7500 rpm
Ignition Type	Electronic
Ignition Switch	Slide Switch
Spark Plug	Champion RDZ19H
Spark Plug Gap	0.635 mm (.025 in)
Fuel Tank Capacity	450 ml (16 fl oz)
Oil Capacity	100 ml (3.4 fl oz)

DRIVE SHAFT & CUTTING HEAD

Drive Shaft	Steel, 1/4"
Drive Shaft Housing	Steel Tube, Split Boom®
Operating Weight	7.78 kg (17.2 lbs)
Throttle Control	Finger-Tip Trigger
Shoulder Strap with Pad	Standard
Line Spool Diameter	102 mm (4 in)
Trimming Line Diameter	2.41 mm (.095 in)
Cutting Path Diameter	440 mm (18 in)

COLD TORQUE SPECIFICATIONS

Spark Plug	11.3-12.3 N•m (100-110
	in•lb)
Rocker Arm Cover Screw	2.2-3.4 N•m (20-30 in•lb)
Brush Blade Lock Nut	25.3-28.1 N•m (225-250
	in•lb)
Engine Cover Screws (Top)	1.1-1.3 N•m (10-12 in•lb)
Engine Cover Screw (Front)	1.1-1.7 N•m (10-15 in•lb)
Engine Cover Screw (Rear)	2.8-3.4 N•m (25-30 in•lb)
Air Filter Cover Screws	2.8-3.4 N•m (25-30 in•lb)
Spark Arrester
Screen Screw	1.7-2.2 N•m (15-20 in•lb)

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