Yard Machines 389, 387 Deck, Cutting Blade REMOVAL, Replacement and Sharpening, Trouble Shooting

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DECK

The underside of the mower deck should be cleaned after each use to prevent a buildup of grass clippings, leaves, dirt or other matter. If this debris is allowed to accumulate, it will invite rust and corrosion, and may prevent proper mulching, discharge or bagging.

The deck may be cleaned by tilting the mower and scraping clean with a suitable tool (make certain the spark plug wire is disconnected).

CUTTING BLADE REMOVAL, REPLACEMENT AND SHARPENING

Blade Adapter

Blade Bell Support

Hex Bolt

Figure 10

•When removing the cutting blade for sharpening or replacement, protect hands by using heavy gloves or a rag before grabbing the blade.

•Remove the bolt and blade bell support which hold the blade and adapter to the engine crankshaft.

•Remove the blade and adapter from the crankshaft.

WARNING: Periodically inspect the blade adapter for cracks, especially if you strike a foreign object. Replace when necessary.

When sharpening the blade, follow the original angle of grind as a guide. It is extremely important that each cutting edge receives an equal amount of grinding to prevent an unbalanced blade. An unbalanced blade will cause excessive vibration when rotating at high speeds. It may cause damage to the mower, and it could break causing personal injury.

The blade can be tested by balancing it on a round shaft screwdriver. Remove metal from the heavy side until it balances evenly. It is recommended that the blade always be removed from the adapter for the when testing for balance.

Before reinstalling the blade and the blade adapter to the unit, lubricate the engine crankshaft and the inner surface of the blade adapter with light oil.

•Be sure to install the blade with the side of the blade marked “Bottom” (or with part number) facing the ground when the mower is in the operating position.

•Slide blade adapter onto engine crankshaft.

•Place blade on adapter. Be certain the blade is aligned with and seated onto the blade adapter flanges.

•Place blade bell support on blade. Make sure the notches on the blade bell support are aligned with the small hole in the blade.

•Replace hex bolt.

•Tighten hex bolt to torque: 450 in. lbs. min., 600 in. lbs. max.

NOTE: To ensure safe operation of your unit, the blade bolt must be checked periodically for correct torque.

TROUBLE SHOOTING

Refer to the trouble shooting section of this manual for helpful information.

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Contents MTD Products INC. P.O. BOX 368022 CLEVELAND, Ohio Important Read Safety Rules and Instructions CarefullyGeneral Operation Important Safe Operation PracticesSlope Operation ServiceDo not ChildrenSafety Labels Found On Lawn Mower Gaugeslope Calling Customer Support Finding Your Model NumberRemove Unit from Carton Disconnect Spark Plug WireUnpacking Instructions SET-UP Your Lawn Mower Items Required for AssemblySET-UP Instructions Tighten wing nuts Blade Control Handle ControlsThrottle Control Recoil StarterOperation Cutting Height Adjustment LeverEngine Controls GAS and OIL FILL-UPUsing Your Rotary Mower Neutral Adjustment TestEach Time Before YOU Start Your Mower To Start Engine and Engage BladeMulching Grass Clippings Bagging Grass ClippingsEmptying a Full BAG of Grass Side Discharging Grass Clippings Optional AdjustmentsHandle Height Adjustment Drive Clutch Control Adjustment Throttle Control AdjustmentEngine MaintenanceLubrication Deck Cutting Blade REMOVAL, Replacement and SharpeningTrouble Shooting Shift Lever Cable Adjustment Models 380 389 Only Drive Belt Removal and Replacement Model 370 Series Small Baffle Blade Adapter Large Baffle Hex Head Screw Drive Belt Removal and Replacement Model 380 Series Six-Speed Direction but not the other. If the wheel OFF-SEASON Storage Trouble Shooting GuideModels 370 thru Front Axle Assembly & Height Adjuster†† Wheel Assembly Chart Description Model 380 thru 811-00185 710-1237 710-0871 Description Shroud Chart MANUFACTURER’S Limited Warranty for

378, 370, 389, 387 specifications

Yard Machines is a well-known brand in the outdoor power equipment market, primarily recognized for producing reliable and efficient lawn care devices. Among their product line, the Yard Machines 389, 387, 378, and 370 models represent the company's commitment to combining advanced technologies with practical features.

Starting with the Yard Machines 389, this model is engineered for durability and performance. It typically comes with a powerful engine that offers ample cutting power, making it ideal for tackling medium to large-sized lawns. The 389 features an adjustable cutting height that allows users to customize their mowing experience according to grass type and desired lawn aesthetics. Additionally, its large grass bag capacity reduces the frequency of emptying, making the mowing task more efficient.

The Yard Machines 387 offers similar performance with slightly varied specifications. It is designed for ease of use, boasting a lightweight frame and ergonomic handles, making it manageable for users of all ages. The 387’s engine is optimized for fuel efficiency, which not only saves money but also reduces the environmental impact. With its sturdy construction, the model is built to withstand the rigors of regular use, ensuring longevity.

Moving to the Yard Machines 378, this model is particularly noted for its enhanced maneuverability, making it suitable for variable terrains, including uneven yards and tight corners. It features a self-propelled option, allowing users to confidently navigate different landscapes without excessive effort. The 378 often includes a mulching capability, permitting grass clippings to be finely shredded and recycled back into the lawn for added nutrients.

Finally, the Yard Machines 370 is the entry-level model in this series, yet it doesn't compromise on performance. It is perfect for homeowners with small to medium lawns. Easy to handle, it often incorporates a straightforward recoil start system, making it user-friendly for those who may be new to lawn maintenance. The compact design further enhances its storage capabilities, appealing to those with limited garage or shed space.

In conclusion, the Yard Machines 389, 387, 378, and 370 models collectively showcase the brand’s dedication to quality and innovation in lawn care. With features designed for various user needs—from powerful engines to user-friendly designs—these mowers cater to a diverse range of customers looking to maintain their outdoor spaces efficiently.
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