John Deere LA120 Riding Mower Parts

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The John Deere LA120 was a popular lawn tractor produced between 2007 and 2014. Powered by a reliable 20 HP Briggs & Stratton single-cylinder engine, it offered a smooth ride and dependable performance. Its popularity stemmed from its user-friendly design and the availability of a 42-inch mowing deck, perfect for medium to large residential lawns.

The John Deere LA120 was introduced as part of the LA100 series in 2007, designed as a mid-range residential lawn tractor. It features a Briggs & Stratton single-cylinder engine, providing a robust 20 horsepower (approximately 656cc displacement). This engine delivers ample power for mowing, bagging, and light towing tasks. The transmission is a hydrostatic transmission, offering smooth, variable speed control with an easy-to-use foot pedal. The LA120 came standard with a 42-inch mowing deck, offering a wide cutting path for efficient mowing. Key features included an electric PTO (Power Take-Off) for easy blade engagement and a comfortable high-back seat. The LA120 distinguished itself from the lower-end models in the LA series with its more powerful engine and hydrostatic transmission, providing enhanced performance and ease of use compared to gear-drive models. It was designed primarily for residential use on properties ranging from half an acre to a couple of acres.

Specifications

Engine	Briggs & Stratton 20 HP 656cc Single-Cylinder
Transmission	Hydrostatic
Deck Size	42 inches
Ground Speed	0-5.5 mph forward, 0-3.2 mph reverse
Fuel Capacity	2.4 gallons
Weight	465 lbs
Years Produced	2007-2014

Maintenance Tips

Belt Replacement: Inspect belts regularly for wear and tear. Replace the deck belt every 200-300 hours of use, or sooner if you notice slippage or cracking.
Blade Sharpening: Sharpen mower blades at least once a season, or more frequently if you mow in sandy or abrasive conditions. Dull blades tear the grass, leading to brown tips and increased disease susceptibility.
Filter Changes: Change the engine oil and filter every 50 hours of operation, or at least once a year. A clean air filter is also crucial for engine performance; replace it annually or more often if operating in dusty conditions.
Seasonal Storage: Before storing your LA120 for the winter, stabilize the fuel with a fuel stabilizer, change the oil and filter, and disconnect the battery. Store the mower in a dry place, ideally covered.

History & Background

The John Deere LA120 was part of the LA100 series, launched in 2007 as a replacement for earlier John Deere lawn tractor models. It offered a blend of affordability and performance, making it a popular choice for homeowners. The LA series was eventually succeeded by the E series in 2018, with improved features and updated styling.

Frequently Asked Questions

What size deck does the John Deere LA120 have?

The John Deere LA120 comes equipped with a 42-inch mowing deck.

What engine is in the John Deere LA120?

The John Deere LA120 is powered by a 20 horsepower Briggs & Stratton single-cylinder engine.

What belt do I need for my John Deere LA120?

The John Deere LA120 typically uses a 1/2" x 95" deck belt. The John Deere part number for the deck belt is M154621. The drive belt part number is M154958.

What blades fit the John Deere LA120?

The John Deere LA120 uses two 21-inch blades, for a total cutting width of 42 inches. These blades typically have a star center hole. Check the part number stamped on your old blade for a direct replacement or use part number GX20430 or GY20568.

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