Cutting Blades

•Remove the hex bolt from the center of the engine pulley (or the electric PTO clutch on units so equipped) and gently lower it off of the engine crankshaft. Be careful not to lose any washers or spacers which may be found on top of the engine pulley or the electric PTO clutch. See Figure 18.

•On units equipped with an electric PTO, the engine pulley is located directly above the electric PTO clutch. Lower the engine pulley far enough to be able to remove the upper drive belt from around it.

IMPORTANT: When remounting the engine pulley or electric PTO clutch, torque the center hex bolt to between 38 foot-pounds and 50 foot-pounds.

•Remove the drive belt by feeding it from both ends toward the front idler pulley on the double-idler bracket. See Figure 16.

•Reassemble by following the above steps in reverse order.

•Reroute the new belt around the pulleys and belt keepers EXACTLY as the old one was routed. Refer to Figure 16.

The AutoDrive™ pedal is properly adjusted when the hole found in the double-idler bracket has approximately 1-3/8" of travel with ten pounds of pressure applied to the AutoDrive™ pedal. See Figure 19.

Double-idler

											Bracket
											Bracket

Hole											Idler
											Idler
											Adj. Rod

Front of Tractor

NOTE: View shown from above tractor.

Figure 19

Adjust the AutoDrive™ pedal after replacing the drive belts on your tractor, if necessary, as follows:

•Locate the speed control assembly on the underside of the steering support bracket. See Figure 20.

•Remove both hairpin clips from the pin which is fastened to the speed control assembly (be careful not to lose the small flat washers found on the pin). See Figure 20.

•Remove the AutoDrive™ pedal return spring.

Using two 9/16" wrenches, remove the pin from the speed control assembly. See Figure 20.

	Idler	Place Wrenches Here
	Adj. Rod	Place Wrenches Here
	Adj. Rod

Neutral

Return

Bracket

Hairpin

Clips

AutoDrive™ Pedal	Speed Control
Return Spring	Assembly

Figure 20

Thread the idler adjustment rod inward or outward to lengthen or shorten the travel of the double-idler bracket until proper adjustment is achieved.

•Reassemble by following the above steps in reverse order.

WARNING: Cutting blades are sharp. Always protect hands by wearing heavy leather work gloves to grasp blades.

The blades may be removed for sharpening or replacement as follows.

•Remove the deck from beneath the tractor, (refer to DECK REMOVAL earlier in this section for detailed instructions) then gently flip the deck over to expose its underside.

•Place a block of wood between the center deck housing baffle and the cutting blade to act as a stabilizer. See Figure 21.

Hex Flange Nut

Block of Wood

Spindle	Cutting Blade
Assembly

Figure 21

•Use a 15/16" wrench to remove the hex flange nut that secures the blade to the spindle assembly. See Figure 21.

604 specifications

The Yard-Man 604 represents an evolution in outdoor power equipment, merging robust design with advanced technology to meet the demands of both residential and professional users. Renowned for its reliability, this machine is built to tackle various lawn care challenges, ensuring a well-manicured outdoor space with minimal effort.

One of the standout features of the Yard-Man 604 is its powerful engine, which offers excellent performance and fuel efficiency. The engine is designed to provide ample torque, enabling it to handle thick grass and uneven terrain with ease. Coupled with a reliable starting system, users can depend on the machine to fire up promptly every time, whether during a warm summer afternoon or a damp spring morning.

The cutting deck of the Yard-Man 604 is another highlight, designed for versatility and precision. With adjustable cutting heights, users can easily customize the lawn’s finish, whether they prefer a close trim or a slightly longer grass length for a lush appearance. The deck's robust construction ensures durability, while the design minimizes clippings left behind, reducing the need for additional cleanup.

In terms of technology, the Yard-Man 604 incorporates advanced features such as a self-propulsion system that adjusts to the user's walking speed, providing an effortless mowing experience. This not only enhances comfort but also improves maneuverability, making it easier to navigate around obstacles like trees and flower beds.

Safety is a key consideration in the design of the Yard-Man 604. It is equipped with a reliable safety switch that prevents accidental start-ups, along with sturdy handles that provide a secure grip during operation. These features, combined with a lightweight structure, make the mower accessible to a wide range of users.

Additionally, maintenance is straightforward with the Yard-Man 604. Its engine design allows for easy access to key components, making routine checks and servicing simple, which ultimately extends the lifespan of the equipment.

Overall, the Yard-Man 604 is characterized by its blend of power, efficiency, and user-friendly features, making it an ideal choice for anyone looking to keep their lawn in pristine condition with minimal hassle. Its thoughtful design caters to both casual homeowners and more demanding landscaping professionals, ensuring that it meets a variety of outdoor maintenance needs.