WARNING: Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Failure to follow these instructions can result in serious personal injury or property damage.

 

 

 

 

 

 

 

b. Unthread the hex nut (C, Figure 5-4)

 

 

 

 

 

 

 

halfway up the adjustment screw (D).

 

 

 

 

 

 

 

c. Unhook the top of the spring from the

 

 

 

 

 

 

 

Forward Clutch Bail.

 

 

 

 

 

 

 

d. Use pliers to prevent the adjuster (B)

 

 

 

 

 

 

 

from turning and turn the slotted screw lo-

 

 

 

 

 

 

 

cated inside the spring clockwise (viewed

 

 

 

 

 

 

 

from operator’s position) to increase ten-

 

 

 

 

 

 

D

sion on the spring. Turn the screw counter-

 

 

 

 

 

 

clockwise to decrease tension. Once

 

 

 

 

 

 

 

adjusted, reattach the spring to the For-

 

 

C

 

 

 

 

ward Clutch Bail.

 

 

 

 

 

 

e. Repeat Steps 2 and 3 to re-measure the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

length of the spring. When the second mea-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

surement is between 1/16" -to- 3/16" longer

 

 

A

 

 

 

B

than the first measurement, retighten the hex

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

nut (C) against the top of the adjuster (B).

FORWARD

 

 

 

 

 

 

 

 

 

 

 

Replacement Belt Information

 

 

 

 

 

 

 

If the drive belt needs to be replaced, see

Figure 5-3: Install tines so that cutting edge of tines enter soil first when tiller moves forward.

your local authorized dealer or refer to the

 

 

 

 

 

 

 

CHECKING AND ADJUSTING

tension is correct if this second measure-

Parts List for ordering information. Use

FORWARD DRIVE BELT TENSION

ment is between 1/6" -to- 3/16" longer than

only a factory-authorized belt as an “over-

the-counter” belt may not perform satis-

It is important to maintain correct tension

the first measurement.

 

4. If the spring is too short (less than

factorily. The procedure requires average

on the forward drive belt. A loose belt will

mechanical ability and commonly available

1/16"), the tension is too loose. If the

cause the tines and wheels to slow down —

tools.

spring is too long (more than 3/16"), the

or stop completely — even though the en-

 

 

tension is too tight.

 

 

 

 

gine is running at full speed. A too tight

 

 

 

 

5. To adjust the length of the spring:

 

 

belt can result in unintentional tine move-

 

 

ment when the clutch bail is in the Neutral

a. Release the Forward Clutch Bail.

 

 

(released) position.

 

 

 

 

 

 

 

 

 

 

5

 

• Check belt tension after the first two

 

 

 

 

 

 

 

 

 

 

 

hours of break-in operation and after every

 

 

 

 

4

 

10 operating hours.

 

 

 

3

 

 

 

 

 

 

 

 

 

 

• At the end of each tilling season, check

 

 

A

2

 

 

the belt for cracks, cuts or frayed edges

 

 

 

 

 

 

C

 

 

 

 

and replace it as soon as possible.

 

 

1

 

 

 

B

 

 

 

 

 

 

 

 

To Check Forward Belt Tension:

 

 

 

 

 

 

 

 

D

 

 

1. Stop engine, wait for all parts to stop

 

 

 

 

 

 

 

 

 

 

 

moving and disconnect spark plug wire.

 

 

Hold bail against handlebar while

 

2. With the Forward Clutch Bail in an open

 

 

 

 

 

taking second measurement of spring

 

(released) position, measure and note the

 

 

 

 

 

 

overall length of the cable spring (A, Figure

 

 

 

 

 

 

5-4) by measuring from the outermost coil

 

 

 

 

 

 

to the outermost coil.

 

 

 

 

 

 

 

Figure 5-4: To check forward belt tension, take two measurements of the

3. Squeeze the Forward Clutch Bail against

 

 

overall length of the coils in the spring — first with the clutch bail open,

the handlebar (see Figure 5-4) and re-

 

then with the clutch bail closed against the handlebar.

measure the length of the coils. The belt

 

 

 

 

 

 

 

 

 

 

 

19

 

 

 

Page 18 Page 20
Page 19
Image 19
Troy-Bilt 640C-Tuffy CRT manual Checking and Adjusting, Replacement Belt Information, To Check Forward Belt Tension
Page 18 Page 20

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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