John Deere 420 Riding Mower Parts

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The John Deere 420 is a premium garden tractor known for its power and durability, manufactured from 1983 to 1992. Powered by a robust Onan 19.9 HP gasoline engine and featuring a hydrostatic transmission, the 420 was capable of handling a variety of tasks. Its reputation for reliability and performance has made it a highly sought-after model for demanding residential and light commercial use.

The John Deere 420 was introduced in 1983 as a high-end garden tractor, replacing the 400 model and offering improved performance and features. It's powered by an Onan B48G twin-cylinder gasoline engine producing a substantial 19.9 horsepower (14.8 kW) with a displacement of 782cc. The 420 features a hydrostatic transmission, providing smooth and responsive control. It was typically equipped with a 60-inch mowing deck, offering a wide cutting swath for efficient mowing. Key features included power steering, hydraulic lift, and a category '0' 3-point hitch option, making it suitable for a wide range of tasks beyond mowing, such as tilling, snow removal, and material hauling. The John Deere 420 distinguished itself from other models in the lineup with its larger engine, heavier-duty construction, and enhanced capabilities, making it ideal for larger properties and more demanding applications.

Specifications

Engine	Onan B48G 19.9 HP 782cc Gasoline
Transmission	Hydrostatic
Deck Size	60 inches
Ground Speed	0-8 mph
Fuel Capacity	5 gallons
Weight	970 lbs
Years Produced	1983-1992

Maintenance Tips

Belt Inspection: Regularly inspect the deck and drive belts for wear and tear. Replace belts every 2-3 years, or sooner if cracks or fraying are visible, to ensure optimal performance.
Blade Sharpening: Sharpen mower blades at least twice per mowing season, or more frequently if mowing in sandy or abrasive conditions. Dull blades tear grass, leading to browning and increasing the risk of disease.
Filter Changes: Change the engine oil and filter annually, or every 50 hours of operation. Also, replace the air filter at least once a year to maintain engine performance and prolong its life.
Seasonal Storage: Before storing the John Deere 420 for the winter, stabilize the fuel, change the oil and filter, and lubricate all grease fittings. Disconnect the battery and store it in a cool, dry place.

History & Background

The John Deere 420 was introduced in 1983 and remained in production until 1992. Replacing the 400 model, it offered improvements in engine power and hydraulic capacity. It was positioned as one of the top-tier garden tractors in John Deere's lineup during its production run.

Frequently Asked Questions

What size deck does the John Deere 420 have?

The John Deere 420 was typically equipped with a 60-inch mowing deck, providing a wide cutting path for efficient mowing.

What engine is in the John Deere 420?

The John Deere 420 is powered by an Onan B48G twin-cylinder gasoline engine, producing 19.9 horsepower.

What belt do I need for my John Deere 420?

Belt sizes and part numbers vary depending on whether it's the mower deck belt or the drive belt. Consult your John Deere 420 operator's manual for the correct part numbers. Common aftermarket belts are also available using the belt dimensions.

What blades fit the John Deere 420?

The John Deere 420 with a 60" deck uses three 20-5/8" blades. Check the blade mounting hole pattern and ensure the blades are compatible with the 60" deck before ordering.

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