4.Check for correct tension on the forward drive belt by taking two measurements of the cable spring, as follows:

a. With the Forward Clutch Bail (Y, Fig. 2-

6)in an open (released) position, measure the length of the cable spring (W) from the outermost coil to the outermost coil.

b. Squeeze the Forward Clutch Bail against the handlebar (see Fig. 2-7) and re-mea- sure the spring length. The belt tension is correct if this second measurement is be- tween 1/16" to 3/16" longer than the first measurement. If so, turn the hex nut (Z, Fig. 2-7) tightly against the cable adjuster

(X)while preventing the cable adjuster from turning.

c. If the spring length is incorrect, you must adjust the cable tension as described in Checking and Adjusting Forward Drive

6

5

4

3

2

Z

1

X

 

Hold bail against handlebar while taking second measurement of spring

Fig. 2-7: To check forward belt tension, take two measurements of the length of the coils in the spring — first with the bail open, then with the bail held against the handlebar.

Belt Tension in Section 5. Incorrect cable tension can result in belt slippage (cable tension too loose), or unintentional tine movement when the clutch bail is in Neu- tral (cable tension too tight).

Y

W

V

W

Z

 

X

 

Fig. 2-5: Cable

Fig. 2-6: Attach forward

spring and

clutch cable spring to

adjuster.

forward clutch bail.

STEP 5: INSTALL REVERSE CLUTCH CABLE (MODEL 644A ONLY)

1.Unwrap the reverse clutch cable (CC, Fig. 2-8 and Fig. 2-9) from its shipping po- sition and route it up to the handlebar. Be sure that the cable is routed beneath the Forward Clutch Bail.

2.Insert the cable (CC, Fig. 2-8) through the slot in the cable bracket and position the flat side of the threaded assembly next to the flat side of the hole. Slide the hex nut (DD) up the cable and tighten it securely.

3.Fasten the reverse clutch cable to the left side handlebar with a cable tie (EE, Fig. 2-9).

4.Test the function of the reverse clutch by pulling out and releasing the cable knob. The knob should return to its neutral posi- tion (resting against bracket). If it doesn’t, contact your local dealer or Troy-Bilt LLC for technical assistance.

BB

DD

CC

Flat Side

Fig. 2-8: Install reverse cable bracket and reverse clutch cable.

CC

BRONCO

EE

Fig. 2-9: Route reverse clutch cable (CC) as shown. Attach with cable tie (EE).

8

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Troy-Bilt 640C - Tuffy CRT, 644A - Super Bronco CRT, 640C-Tuffy manual While preventing the cable adjuster from turning
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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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