Adjustments, Lubrication, Maintenance | Yard Machines 420, 410

SECTION 9: ADJUSTMENTS

HANDLE ADJUSTMENT

The handle height may be adjusted. On Model 420, the handle may also be adjusted to be in line with the tiller, or swung to the left or right. Refer to the Control section for details of handle adjustment.

BELT TENSION ADJUSTMENT

Periodic adjustment of the belt tension may be required due to normal stretch and wear on the belt. Adjustment is needed if the tines or wheels seem to hesitate while turning, but the engine maintains the same speed.

To adjust the tension on the belt, refer to final clutch adjustment in Assembly Instructions.

CARBURETOR ADJUSTMENT

WARNING: If any adjustments are made to the engine while the engine is running, (e.g. carburetor), disengage all clutches and tines. Keep clear of all moving parts. Be careful of heated surfaces and muffler.

Never make unnecessary adjustments. The factory settings are correct for most applications. If adjustments are needed, refer to the separate engine manual packed with your tiller.

SECTION 10: LUBRICATION

Transmission—The transmission is pre-lubricated and sealed at the factory. It requires no checking unless the transmission is disassembled. To fill with grease, lay the right half of the transmission on its side. Add 22 ounces of Benalene 920 grease. Assemble the left half to it. This grease can be obtained at your nearest authorized dealer. Order part number 737-0300.

Clutch Handle—Lubricate the pivot point on the clutch handle and the cable at least once a season with light oil. The control must operate freely in both directions.

Pivot Points—Lubricate all pivot points and linkages at least once a season with light oil.

Tine Shafts—Remove tine assemblies and lubricate the tine shafts at least once a season.

Wheel Shafts—Remove wheel assemblies and lubricate the axle shafts at least once a season.

SECTION 11: MAINTENANCE

WARNING: Disconnect the spark plug wire and ground it against the engine before performing any repairs or maintenance.

ENGINE

Refer to the separate engine manual for engine maintenance instructions.

Maintain engine oil as instructed in the separate engine manual packed with your unit. Read and follow instructions carefully.

Service air cleaner every ten hours under normal conditions. Clean every hour under extremely dusty conditions. Poor engine performance and flooding usually indicates that the air cleaner should be serviced. To service the air cleaner, refer to the separate engine manual packed with your unit.

IMPORTANT: Never run your engine without air cleaner completely assembled.

The spark plug should be cleaned and the gap reset every 25 hours of engine operation. Spark plug replacement is recommended at the start of each tiller season; check engine manual for correct plug type and gap specification.

Clean the engine regularly with a cloth or brush. Keep the cooling system (blower housing area) clean to permit proper air circulation which is essential to engine performance and life. Be certain to remove all dirt and combustible debris from muffler area.

CLEANING THE TINE AREA

Clean the underside of the tine shield after each use. The dirt washes off the tines easier if washed off immediately instead of after it dries.

420, 410 specifications

The Yard Machines 410 through 429, 21" Rear Discharge Push Mower is a robust and versatile lawn care solution designed for homeowners who prioritize efficiency and convenience. This highly regarded mower stands out in the market thanks to its state-of-the-art features and technology that enhance mowing performance.

One of the main features of the Yard Machines push mower is its 21-inch cutting deck, specifically designed for optimal maneuverability and efficiency in both small and medium-sized yards. The rear discharge functionality allows for a clean and controlled cut, ensuring grass clippings are evenly distributed behind the mower, which helps to improve the lawn's overall health by returning nutrients to the soil.

Equipped with a powerful 140cc engine, the Yard Machines mower provides reliable performance for tackling various grass types and yard conditions. The engine's design prioritizes fuel efficiency, allowing homeowners to mow larger areas without frequently stopping for refueling. The easy-start mechanism enhances user experience, ensuring that the mower starts quickly with minimal hassle.

Another key characteristic is the adjustable cutting height feature, which offers six different settings, ranging from 1.25 inches to 3.75 inches. This versatility allows users to customize their mowing experience based on the specific needs of their lawn and prevailing weather conditions. Whether you need a close cut for a formal look or a higher cut for more foliage, this mower can accommodate your preferences.

The Yard Machines 410 through 429 models also excel in user comfort and ease of use. The lightweight design ensures that even less experienced operators can maneuver the mower effortlessly. Additionally, the ergonomic handlebar provides a comfortable grip and helps to reduce fatigue during extended mowing sessions.

Durability is another standout aspect of this mower, as it features a sturdy steel deck that can withstand the rigors of regular use, ensuring longevity and reliability. Furthermore, the mower's compact size allows for easy storage, even in tight spaces.

Overall, the Yard Machines 410 through 429, 21" Rear Discharge Push Mower is an excellent choice for homeowners seeking a reliable, efficient, and user-friendly option for maintaining their lawns. With its combination of powerful performance, adjustable features, and durability, this mower is designed to make lawn care an effortless and enjoyable task.