Lawn Mower

Always observe safety rules when per- forming any maintenance.

IMPORTANT: Blade bolt is heat treated. If bolt needs replacing, replace only with approved bolt shown in the Repair Parts section of this manual.

TIRES

•Keep tires free of gasoline, oil, or insect control chemicals which can harm rubber.

•Avoid stumps, stones, deep ruts, sharp objects and other hazards that may cause tire damage.

DRIVE WHEELS

Blade adapter	Key	Crankshaft
		keyway
Lockwasher
Blade

Check rear drive wheels each time before you mow to be sure they move freely.

The wheels not turning freely means trash, grass cuttings, etc. are in the drive wheel area and must be cleaned to free drive wheels. If necessary to clean the drive wheels, be sure to clean both rear wheels.

BLADE CARE

For best results, blade must be kept sharp. Replace a bent or damaged blade. CAUTION: Use only a replacement blade approved by the manufacturer of your mower. Using a blade not approved by the manufacturer of your mower is haz- ardous, could damage your mower and void your warranty.

TO REMOVE BLADE

1.Disconnect spark plug wire from spark plug and place wire where it cannot come in contact with plug.

2.Turn lawn mower on its side. Make sure air ﬁlter and carburetor are up.

3.Use a wood block between blade and mower housing to prevent blade from turning when removing blade bolt.

NOTE: Protect your hands with gloves and/or wrap blade with heavy cloth.

4.Remove blade bolt by turning counter- clockwise.

5.Remove blade & attaching hardware (bolt, lock washer & hardened washer).

TO REPLACE BLADE

1.Position blade on the blade adapter aligning the two (2) holes in the blade with the raised lugs on the adapter.

2.Be sure the trailing edge of blade (oppo- site sharp edge) is up toward engine.

3.Install the blade bolt with the lock washer and hardened washer into blade adapter and crankshaft.

4.Use block of wood between blade and lawn mower housing and tighten the blade bolt, turning clockwise.

•The recommended tightening torque is 35-40 ft. lbs.

Blade
bolt Hardened
washer	Trailing edge	Crankshaft

TO SHARPEN BLADE

NOTE: We do not recommend sharp-

ening the blade - but if you do, be sure the blade is balanced. An unbalanced blade will cause eventual damage to mower or engine.

•The blade can be sharpened with a ﬁle or on a grinding wheel. Do not attempt to sharpen while on the mower.

•To check blade balance, drive a nail into a beam or wall. Leave about one inch of the straight nail exposed. Place center hole of blade over the head of the nail. If blade is balanced, it should remain in a horizontal position. If either end of the blade moves downward, sharpen the heavy end until the blade is balanced.

GRASS CATCHER

•The grass catcher may be hosed with water, but must be dry when used.

•Check your grass catcher often for dam- age or deterioration. Through normal use it will wear. If catcher needs replac- ing, replace only with approved replace- ment catcher shown in the Repair Parts section of this manual. Give the lawn mower model number when ordering.

GEAR CASE

•To keep your drive system working properly, the gear case and area around the drive should be kept clean and free of trash build-up. Clean under the drive cover twice a season.

•The gear case is ﬁlled with lubricant to the proper level at the factory. The only time the lubricant needs attention is if service has been performed on the gear case.

•If lubricant is required, use only Texaco Starplex Premium 1 Grease, Part No.

13750369. Do not substitute.

6521RS specifications

The Husqvarna 6521RS is a versatile and powerful lawn mower, designed for homeowners who seek an efficient tool for their yard maintenance tasks. This model stands out with its exceptional features, technologies, and characteristics, making it a popular choice for both novice and experienced users.

At the heart of the Husqvarna 6521RS is its robust 163cc engine, which delivers strong power and performance while ensuring fuel efficiency. The engine is designed to start easily and operate smoothly, providing users with a seamless mowing experience. The mower features a 21-inch steel cutting deck, ensuring a wider cutting path that reduces the time spent mowing, perfect for medium to large sized lawns.

One of the standout features of the 6521RS is its Smart Start technology, which ensures that the mower starts quickly and with minimal effort, allowing users to focus on the task at hand without frustration. This technology works in conjunction with an air purge system that removes air from the carburetor and fuel system, promoting easier engine start-up.

The adjustable cutting height on the Husqvarna 6521RS ranges from 1 inch to 4 inches, allowing users to customize their mowing height to achieve the perfect lawn finish. The easy-to-use lever allows for quick adjustments, accommodating various grass types and seasonal changes.

Additionally, the mower is equipped with a rear-wheel drive system, which enhances its maneuverability and traction. This feature is especially beneficial when navigating around obstacles or mowing on uneven terrain, providing better control and stability.

For added convenience, the Husqvarna 6521RS comes with a foldable handle, making it easy to store the mower in compact spaces. This ergonomic design not only saves space but also ensures comfort during extended use, minimizing user fatigue.

The mower's durable construction is designed to withstand the rigors of frequent use. The robust materials and high-quality components contribute to a longer lifespan, making the 6521RS a worthwhile investment for homeowners.

Overall, the Husqvarna 6521RS combines performance, convenience, and durability, making it ideal for anyone looking to maintain a beautiful lawn with minimal effort. Whether you’re tackling a small patch or a larger yard, this mower is equipped to handle the job efficiently.