A

D

B

C

Figure 3-3: FREEWHEEL position.

WARNING: Before starting engine, be sure that both wheels are in WHEEL DRIVE position. See Wheels Drive Pins for instructions.

Engaging the Forward Clutch Bail or Reverse Clutch Control (if equipped) when the wheels are not in WHEEL DRIVE could allow the tines to rapidly propel the tiller forward or backward.

Failure to comply could cause loss of tiller control, property damage, or personal injury.

FORWARD CLUTCH BAIL

The Forward Clutch Bail (E, Figure 3-4) controls the engagement of forward drive to the wheels and tines.

To operate the Forward Clutch Bail:

1.Put wheels in WHEEL DRIVE position (see “WARNING” statement above).

2.Lift and hold the clutch bail (E, Figure 3-

4) against the handlebar to start the wheels and tines rotating in a forward direction.

3.Release the clutch bail to disengage (stop) the wheels and tines (the engine will continue to run).

REVERSE CLUTCH CONTROL (Model 644A only)

The Reverse Clutch Control (F, Figure 3-4) controls the engagement of reverse drive to the wheels and tines. The reversing fea- ture is used for maneuvering the tiller only — never engage the tines in the ground while operating in reverse.

WARNING: Use extreme caution when reversing or pulling the machine towards you. Look behind to avoid obstacles.

Never attempt to till in reverse. Failure to follow this warning could result in personal injury or property damage.

To operate the Reverse Clutch Control:

1.Put wheels in WHEEL DRIVE position (see “WARNING” statement at the left).

2.Stop all tiller motion by releasing the Forward Clutch Bail.

3.Lift the handlebar until the tines clear the ground, look behind you to avoid any obstacles, and then pull the control knob (F, Figure 3-4) out. The wheels and tines will rotate in a reverse direction.

4.Release the control knob to disengage (stop) the wheels and tines (the engine will continue to run).

F

E

Figure 3-4: All models have a Forward Clutch Bail (E). Only Model 644A have a Reverse Clutch Control (F).

DEPTH REGULATOR LEVER

This lever (G, Figure 3-5) controls the till- ing depth of the tines. Pull the lever back and slide it up or down to engage the notched height settings.

The “travel position” (highest notch) raises the tines approximately 1-1/2" off the ground, allowing the tiller to be moved without the tines contacting the ground. This setting should also be used when starting the engine.

Moving the lever upward will increase the tilling depth. The lowest notch allows a till- ing depth of approximately 6”, depending on soil conditions. For best results, always

begin tilling at a very shallow depth setting and gradually increase the tilling depth.

WARNING: Do not attempt to till too deeply too quickly. Gradually work down to deeper tilling depths.

Place the Depth Regulator Lever in the “travel” position before starting the engine. This position prevents the tines from touching the ground until you are ready to begin tilling. Failure to follow this warning could result in personal injury or property damage.

Travel Position

G

 

Shallow

 

Settings

Deep

 

 

Settings

Figure 3-5: Depth Regulator Lever (G).

HANDLEBAR HEIGHT ADJUSTMENT

The handlebar height is adjustable to three different settings (Figure 3-6). In general, adjust the handlebars so they are at waist level when the tines are 3"-4" in the soil.

To adjust the handlebars:

1.Stop engine, disconnect spark plug wire from spark plug and allow engine to cool.

2.Remove hardware, reposition handle- bars, and reinstall hardware securely.

High

Medium

Low

Figure 3-6: Handlebar height adjustment.

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Troy-Bilt 640C - Tuffy CRT, 644A - Super Bronco CRT To operate the Forward Clutch Bail, Travel Position Shallow Settings
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640C - Tuffy CRT, 644A - Super Bronco CRT, 640C-Tuffy CRT, 640C-Tuffy specifications

The Troy-Bilt 640C-Tuffy and the 644A-Super Bronco CRT are exemplary models in the realm of cultivators and tillers, merging robust performance with user-friendly features. These machines are designed to make garden preparation easier and more efficient, catering to both amateur gardeners and seasoned horticulturists alike.

The Troy-Bilt 640C-Tuffy boasts a powerful engine and features a rear-tine design, enabling the user to tackle tough soil with ease. One of its main features is the Carbide Tines that effectively break up hard ground and aerate the soil, promoting healthy growth. The 640C-Tuffy is sturdy, with durable construction that ensures longevity and resilience against tough garden conditions. It also includes a 10-inch tilling width, allowing it to cover substantial ground in shorter periods. Moreover, the model is equipped with adjustable tilling depth settings, accommodating various types of gardening tasks from breaking new ground to preparing existing beds.

On the other hand, the 644A-Super Bronco CRT highlights innovative technology that makes tilling a breeze. This model features counter-rotating tines which effectively mix compost and soil, offering improved mixing and aeration. The 644A is known for its robust performance, powered by a reliable engine, which delivers consistent torque even on challenging soil types. Additionally, its 18-inch tilling width allows for broader coverage, resulting in efficient garden preparation.

Both models are equipped with ergonomic handlebars designed for operator comfort. These handlebars are adjustable, allowing users of different heights to find a comfortable grip, thus reducing fatigue during extended use. The 640C-Tuffy and 644A-Super Bronco CRT are designed with ease of operation in mind, featuring intuitive controls and a lightweight design that makes maneuvering effortless.

In terms of maintenance, both models boast easily accessible components which allow for simple servicing and routine upkeep, ensuring long-lasting performance. Additionally, these cultivators are built with safety features, including protective shields that guard against debris.

In summary, the Troy-Bilt 640C-Tuffy and 644A-Super Bronco CRT shine in their ability to combine cutting-edge technology, user-friendly operation, and robust design, making them ideal choices for anyone looking to enhance their gardening experience. Whether preparing a new garden bed or maintaining an existing one, these cultivators are engineered to deliver exceptional results with ease and confidence.
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