Toro Grassmaster 21-inch 20403 Operator's Manual

Toro Grassmaster 21-inch 20403 Mower manual cover

Pages 24

Year 1976

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Toro Grassmaster 21-inch 20403 Mower Specification

The Toro Grassmaster 21-inch 20403 Mower is a robust and efficient lawn care solution designed to meet the needs of both residential and professional users. This model features a powerful 160cc Honda GCV160 engine, renowned for its reliability and fuel efficiency, ensuring optimal performance even under demanding conditions. The 21-inch cutting deck provides a balanced combination of maneuverability and cutting capacity, allowing for precise trimming in tight spaces while covering ample ground efficiently.

The mower is equipped with a durable steel deck, enhancing its longevity and resistance to wear and tear. Its cutting height can be adjusted through a simple lever system, offering multiple positions to accommodate different grass types and user preferences. The Grassmaster 20403 includes a 3-in-1 cutting system, providing versatile grass management options such as mulching, bagging, or side discharge to suit various lawn care strategies.

Ergonomically designed, the mower features a comfortable, adjustable handle with foam grip, reducing operator fatigue during extended use. The inclusion of large rear wheels enhances maneuverability across uneven terrain, while the lightweight design facilitates easy transportation and storage. Additionally, the mower's Quick-Wash port allows for straightforward cleaning of the deck, promoting optimal maintenance and performance.

Safety features include a blade brake clutch system, allowing the user to stop the blade without shutting off the engine, increasing safety and convenience when emptying the bag or moving obstacles. Overall, the Toro Grassmaster 21-inch 20403 Mower combines power, versatility, and user-friendly features, making it a reliable choice for maintaining a pristine lawn.

Toro Grassmaster 21-inch 20403 Mower F.A.Q.

How do I start the Toro Grassmaster 21-inch 20403 Mower?

To start the Toro Grassmaster 21-inch 20403 Mower, ensure the fuel tank is filled, the spark plug is connected, and the oil level is adequate. Then, press the primer bulb a few times, pull the starter handle, and engage the throttle lever to start the mower.

What should I do if the mower doesn’t start?

If the mower doesn’t start, check the spark plug for damage or corrosion, ensure the fuel is fresh, and verify that the air filter is clean. Additionally, inspect the fuel line for blockages and ensure the carburetor is functioning properly.

How often should I change the oil in my Toro Grassmaster mower?

It's recommended to change the oil after the first 5 hours of use and then every 25 hours of operation or at least once a mowing season. Use SAE 30 oil for optimal performance.

How do I properly sharpen the mower blades?

To sharpen the blades, disconnect the spark plug, remove the blade using a wrench, and secure it in a vice. Use a file or a grinding wheel to sharpen the edge evenly. Reinstall the blade securely after sharpening.

What maintenance is required for the mower’s air filter?

Check the air filter every 25 hours of use or once per season. Replace the paper filters when dirty, and clean the foam filters with warm, soapy water. Allow them to dry completely before reinstalling.

How do I adjust the cutting height on my Toro mower?

To adjust the cutting height, locate the height adjustment levers near each wheel. Move the levers to the desired position to achieve the preferred cutting height, ensuring all wheels are set equally.

What should I do if the mower is vibrating excessively?

Excessive vibration may be caused by an unbalanced blade, loose engine mounting bolts, or debris lodged in the blade area. Check and tighten any loose parts, and ensure the blade is balanced and secure.

How can I clean the undercarriage of the mower?

To clean the undercarriage, disconnect the spark plug, tilt the mower to the side (carburetor side up), and use a brush or hose to remove grass clippings and debris. Ensure the mower is completely dry before storage.

What type of fuel should I use for the Toro Grassmaster mower?

Use unleaded gasoline with an octane rating of 87 or higher. Avoid using gasoline with more than 10% ethanol, as it can damage the engine components.

How do I store the mower during the off-season?

Before storing, run the mower dry or add a fuel stabilizer to the tank. Clean the mower thoroughly, change the oil, and remove the spark plug. Store the mower in a dry, sheltered place to prevent rust and damage.