The provided document is a user manual for the Ryobi RLM4619SMB Petrol Lawn Mower, offering comprehensive instructions for assembly, operation, and maintenance. This walk-behind, pedestrian-controlled mower is designed for domestic lawn mowing, ensuring the cutting blade rotates approximately parallel to the ground with all four wheels touching the surface during operation. It is explicitly stated that the mower should not be operated with its wheels off the ground, pulled, or ridden on, and is not intended for cutting anything other than domestic grass lawns.
Important Technical Specifications:
The Ryobi RLM4619SMB is powered by a 190cc OHV engine, delivering a no-load speed of 2,700 revolutions per minute (RPM). It boasts a torque of 11.2 Newton Metres (Nm) or 8.2 Foot Pounds (ft lb) at 2,500 RPM. The cutting path is 460 mm wide, and the mower offers 10 height adjustments ranging from 10 mm to 75 mm. The wheel sizes are 7 inches for the front and 8 inches for the rear. The grass bag has a capacity of 50 litres.
In terms of acoustics, the guaranteed sound power level (LwA) is 98 dB with a K-value of 3, and the sound pressure level (LpA) is 86.6 dB with a K-value of 3. Vibration levels are measured at 9.721 m/s² (K=1.5) for the left handle and 6.744 m/s² (K=1.5) for the right handle. The guaranteed values are 86 dB Pressure level (LpA) and 98 dB Power level (LWA). The net weight of the mower is 35.2 kg, with a gross weight of 39.4 kg. It has an oil capacity of 0.6 litres and a petrol tank capacity of 0.95 litres.
Usage Features:
The manual emphasizes personal safety, warning that the mower is capable of amputating hands and feet and throwing objects. Users are advised to wear heavy, long trousers, long sleeves, slip-resistant footwear, gloves, ear protection, and safety glasses. Operation is restricted to adults familiar with the instructions, with children and pets to be kept at least 15 meters away from the work area. The mower should not be operated in poor lighting, wet grass, or explosive atmospheres.
The RLM4619SMB features a primer bulb for starting, a throttle lever for speed control, and a starter cord. For cold starts, the primer bulb should be pushed three times, and the throttle lever set to "Max." For warm starts, the primer bulb should be pushed twice. The engine is stopped by returning the throttle lever to the stop position.
The cutting blade height can be adjusted using a height adjustment lever, with an average lawn height recommendation of 3 to 6 cm. The handle length and height are also adjustable for operator preference, secured by handle knobs and bolts.
The mower supports both grass catching and mulching operations. For mulching, a mulching plug is installed, and the grass catcher is not used. When grass catching, the grass catcher is installed under the rear discharge door.
Slope operation requires extreme caution, with a recommendation not to mow slopes greater than 15 degrees and to mow across the face of slopes, not up and down. Users are warned to watch for holes, ruts, rocks, hidden objects, or bumps that could cause slips or trips.
Maintenance Features:
Regular maintenance is crucial for safe and efficient operation. Before any maintenance, the engine must be stopped, the blade allowed to come to a complete stop, and the spark plug wire disconnected.
Fuelling and Refuelling: Petrol should be handled with care, stored in designated containers, and refuelling should always occur outdoors away from sparks and flames. Unleaded petrol with an octane rating of 91 or higher is recommended. The fuel tap has closed (off) and open (on) positions.
Engine Oil: SAE 10W-30 oil is recommended for general, all-temperature use. Non-detergent or 2-cycle engine oils will damage the engine. Oil level should be checked with the dipstick seated, and oil should be added slowly to the "Full" line without overfilling. Engine oil should be changed after every 25 hours of use, preferably when the oil is warm but not hot.
Spark Plug Maintenance: The spark plug (recommended model: NGK BPR6HS) should be inspected, cleaned, and gapped (0.028 - 0.031 inches) regularly. A cracked or chipped spark plug should be replaced.
Air Filter Maintenance: The mower has a paper air filter that cannot be washed. It should be inspected regularly, cleaned by tapping or brushing, and replaced annually or sooner if necessary.
Blade Maintenance: Blades, blade bolts, and the cutter assembly should be visually inspected before each use for wear or damage. Worn or damaged blades and bolts should be replaced in sets to preserve balance. When replacing the cutting blade, heavy gloves should be worn, and the engine stopped with the spark plug lead disconnected. The mower should be tilted on its side with the carburettor facing up, and a block of wood used to prevent the disc from turning. The disc bolt should be torqued to 48-55 Nm (35-40 ft. lb.). Blade sharpening by the user is not recommended.
Cleaning: The underside of the mower deck should be cleaned after each use to remove grass clippings and debris. This can be done by connecting a water hose to the male connector on the deck, running the engine for 30 seconds, then shutting off the water and allowing the deck to dry. The grass catcher should also be checked frequently for wear or deterioration.
Storage: For storage of 30 days or more, fuel stabilizer should be added to the petrol tank, or the engine run until it is completely out of petrol. The fuel tap should be in the closed position. The mower should be stored in a clean, dry, well-ventilated area, out of reach of children, and away from corrosive materials. The handle can be folded down for compact storage.
Transportation: Before transport, the machine should be stopped, the spark plug wire disconnected, and the blade allowed to cool. The fuel tank should be emptied by running the engine until it stops, and the oil should be emptied following instructions. The machine must be secured against movement or falling to prevent injury or damage.
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