Yard Machines 370, 387, 389, 378 manual Six-Speed

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Step 13. Squeeze the belt together and push belt

Step 18. Pivot the control arm down away from the

forward. Press the control arm inward towards

pulley and belt.

the deck and remove the six speed cable from

 

 

 

 

 

 

 

 

 

 

the slot.

 

 

 

 

 

 

 

 

 

 

 

Six-Speed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Six-Speed

 

 

 

 

 

 

 

 

 

 

 

Cable Slot

 

 

 

 

Belt

 

 

 

 

 

 

 

 

 

 

Cable Slot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 14. Place the new belt over the transmission

Step 19. Lift off the lower pulley assembly and

pulley. Start the belt in pulley groove and rotate

remove the old belt from around the

crankshaft.

pulley until belt is seated in transmission pulley.

 

 

Step 15. Place belt between idler pulley and the belt

Lower Pulley

 

keeper bracket.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Half

 

Step 16. Using pliers, rotate the belt keeper bracket

Crankshaft

so that it snaps into slot on the idler bracket.

 

 

Step 17. Tighten the idler pulley bolt and locknut

 

 

using two 7/16” wrenches.

 

 

 

 

 

 

 

 

 

 

 

Transmission

 

 

 

 

 

 

 

 

 

 

 

Pulley

 

 

 

 

 

 

 

 

 

 

 

Belt

 

 

 

 

 

 

 

 

 

Belt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Belt Keeper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bracket

 

 

 

 

 

 

 

 

Transmission

 

 

Idler Pulley

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 20. Place belt between the two pulley halves on

Bracket

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the crankshaft. Make sure to route the belt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Idler Pulley

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

inside the belt guard pin.

 

Bolt and

 

 

 

 

 

 

 

 

 

Upper

 

Locknut

 

 

 

 

 

 

 

 

 

Pulley

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Half

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tab

Belt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Belt

Lower

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Guard

Pulley

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin

Half

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IMPORTANT: When changing the belt, do not disassemble

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the lower pulley assembly.

 

22

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Contents Important Read Safety Rules and Instructions Carefully MTD Products INC. P.O. BOX 368022 CLEVELAND, OhioImportant Safe Operation Practices General OperationDo not ServiceSlope Operation ChildrenSafety Labels Found On Lawn Mower Gaugeslope Finding Your Model Number Calling Customer SupportUnpacking Instructions Disconnect Spark Plug WireRemove Unit from Carton SET-UP Instructions Items Required for AssemblySET-UP Your Lawn Mower Tighten wing nuts Throttle Control ControlsBlade Control Handle Recoil StarterEngine Controls Cutting Height Adjustment LeverOperation GAS and OIL FILL-UPEach Time Before YOU Start Your Mower Neutral Adjustment TestUsing Your Rotary Mower To Start Engine and Engage BladeEmptying a Full BAG of Grass Bagging Grass ClippingsMulching Grass Clippings Handle Height Adjustment AdjustmentsSide Discharging Grass Clippings Optional Throttle Control Adjustment Drive Clutch Control AdjustmentLubrication MaintenanceEngine Trouble Shooting Cutting Blade REMOVAL, Replacement and SharpeningDeck 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 Trouble Shooting Guide OFF-SEASON StorageFront Axle Assembly & Height Adjuster Models 370 thru†† 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.